Merge pull request #10236 from TacoTheDank/master

Miscellaneous performance lints

OsmAnd-java/src/main/java/com/google/protobuf/ByteString.java

@@ -800,7 +800,7 @@ public abstract class ByteString implements Iterable<Byte> {
         // Copy the information we need into local variables so as to hold
         // the lock for as short a time as possible.
         cachedFlushBuffers =
-            flushedBuffers.toArray(new ByteString[flushedBuffers.size()]);
+            flushedBuffers.toArray(new ByteString[0]);
         cachedBuffer = buffer;
         cachedBufferPos = bufferPos;
       }

OsmAnd-java/src/main/java/com/google/protobuf/FieldSet.java

@@ -242,8 +242,7 @@ final class FieldSet<FieldDescriptorType extends
 
       // Wrap the contents in a new list so that the caller cannot change
       // the list's contents after setting it.
-      final List newList = new ArrayList();
+      final List newList = new ArrayList((List) value);
-      newList.addAll((List) value);
       for (final Object element : newList) {
         verifyType(descriptor.getLiteType(), element);
       }

OsmAnd-java/src/main/java/com/wdtinc/mapbox_vector_tile/adapt/jts/JtsAdapter.java

@@ -345,7 +345,6 @@ public final class JtsAdapter {
             for(int i = 0; i < geom.getNumGeometries(); ++i) {
 
                 final Polygon nextPoly = (Polygon) geom.getGeometryN(i);
-                final List<Integer> nextPolyGeom = new ArrayList<>();
                 boolean valid = true;
 
                 // Add exterior ring
@@ -362,7 +361,7 @@ public final class JtsAdapter {
                     CoordinateArrays.reverse(exteriorRing.getCoordinates());
                 }
 
-                nextPolyGeom.addAll(linesToGeomCmds(exteriorRing, mvtClosePath, cursor, 2));
+                final List<Integer> nextPolyGeom = new ArrayList<>(linesToGeomCmds(exteriorRing, mvtClosePath, cursor, 2));
 
 
                 // Add interior rings

OsmAnd-java/src/main/java/com/wdtinc/mapbox_vector_tile/adapt/jts/MvtReader.java

@@ -322,7 +322,7 @@ public final class MvtReader {
             geoms.add(geomFactory.createLineString(nextCoordSeq));
         }
 
-        return geoms.size() == 1 ? geoms.get(0) : geomFactory.createMultiLineString(geoms.toArray(new LineString[geoms.size()]));
+        return geoms.size() == 1 ? geoms.get(0) : geomFactory.createMultiLineString(geoms.toArray(new LineString[0]));
     }
 
     /**
@@ -450,7 +450,7 @@ public final class MvtReader {
             return polygons.get(0);
 
         } else {
-            return geomFactory.createMultiPolygon(polygons.toArray(new Polygon[polygons.size()]));
+            return geomFactory.createMultiPolygon(polygons.toArray(new Polygon[0]));
         }
     }
 
@@ -512,7 +512,7 @@ public final class MvtReader {
 
                 if (area > 0d) {
                     if (outerPoly != null) {
-                        polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[holes.size()])));
+                        polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[0])));
                         holes.clear();
                     }
 
@@ -533,7 +533,7 @@ public final class MvtReader {
 
             if (outerPoly != null) {
                 holes.toArray();
-                polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[holes.size()])));
+                polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[0])));
             }
 
             return polygons;
@@ -569,7 +569,7 @@ public final class MvtReader {
 
                 if (outerPoly == null || (outerArea < 0 == area < 0)) {
                     if (outerPoly != null) {
-                        polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[holes.size()])));
+                        polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[0])));
                         holes.clear();
                     }
 
@@ -590,7 +590,7 @@ public final class MvtReader {
 
             if (outerPoly != null) {
                 holes.toArray();
-                polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[holes.size()])));
+                polygons.add(geomFactory.createPolygon(outerPoly, holes.toArray(new LinearRing[0])));
             }
 
             return polygons;

OsmAnd-java/src/main/java/net/osmand/GPXUtilities.java

@@ -1247,7 +1247,7 @@ public class GPXUtilities {
 					}
 				}
 			}
-			g.prepareInformation(fileTimestamp, splitSegments.toArray(new SplitSegment[splitSegments.size()]));
+			g.prepareInformation(fileTimestamp, splitSegments.toArray(new SplitSegment[0]));
 			return g;
 		}
 

OsmAnd-java/src/main/java/net/osmand/TspHeldKarp.java

@@ -68,7 +68,7 @@ public class TspHeldKarp {
 					}
 					break;
 				}
-				System.err.printf(".");
+				System.err.print(".");
 				PriorityQueue<Node> children = new PriorityQueue<Node>(11, new NodeComparator());
 				children.add(exclude(currentNode, i, currentNode.parent[i]));
 				for (int j = 0; j < n; j++) {

OsmAnd-java/src/main/java/net/osmand/binary/BinaryMapIndexReader.java

@@ -2501,8 +2501,9 @@ public class BinaryMapIndexReader {
 				}
 			}
 		}
-		for (MapObject e : resMap.keySet()) {
+		for (Entry<MapObject, Street> entry : resMap.entrySet()) {
-			Street s = resMap.get(e);
+			MapObject e = entry.getKey();
+			Street s = entry.getValue();
 			if (e instanceof Building && MapUtils.getDistance(e.getLocation(), lat, lon) < 40) {
 				Building b = (Building) e;
 				System.out.println(b.getName() + "   " + s);

OsmAnd-java/src/main/java/net/osmand/binary/CachedOsmandIndexes.java

@@ -241,9 +241,7 @@ public class CachedOsmandIndexes {
 				cblock.type = mr.getType();
 				mi.cities.add(cblock);
 			}
-			for(String s : index.getAdditionalTagsList()) {
+			mi.attributeTagsTable.addAll(index.getAdditionalTagsList());
-				mi.attributeTagsTable.add(s);
-			}
 			reader.addressIndexes.add(mi);
 			reader.indexes.add(mi);
 		}

OsmAnd-java/src/main/java/net/osmand/binary/RouteDataObject.java

@@ -329,7 +329,7 @@ public class RouteDataObject {
 	public String getDestinationName(String lang, boolean transliterate, boolean direction){
 		//Issue #3289: Treat destination:ref like a destination, not like a ref
 		String destRef = ((getDestinationRef(direction) == null) || getDestinationRef(direction).equals(getRef(lang, transliterate, direction))) ? "" : getDestinationRef(direction);
-		String destRef1 = ("".equals(destRef)) ? "" : destRef + ", ";
+		String destRef1 = Algorithms.isEmpty(destRef) ? "" : destRef + ", ";
 
 		if(names != null) {
 			int[] kt = names.keys();
@@ -373,7 +373,7 @@ public class RouteDataObject {
 				return destRef1 + ((transliterate) ? TransliterationHelper.transliterate(destinationDefault) : destinationDefault);
 			}
 		}
-		return "".equals(destRef) ? null : destRef;
+		return Algorithms.isEmpty(destRef) ? null : destRef;
 	}
 
 	public int getPoint31XTile(int i) {

OsmAnd-java/src/main/java/net/osmand/data/Multipolygon.java

@@ -61,9 +61,9 @@ public class Multipolygon {
 					innerLinearRings.add(innerRing.toLinearRing());
 				}
 			}
-			polygons.add(geometryFactory.createPolygon(outerRing.toLinearRing(), innerLinearRings.toArray(new LinearRing[innerLinearRings.size()])));
+			polygons.add(geometryFactory.createPolygon(outerRing.toLinearRing(), innerLinearRings.toArray(new LinearRing[0])));
 		}
-		return geometryFactory.createMultiPolygon(polygons.toArray(new Polygon[polygons.size()]));
+		return geometryFactory.createMultiPolygon(polygons.toArray(new Polygon[0]));
 	}
 
 	public long getId() {

OsmAnd-java/src/main/java/net/osmand/map/TileSourceManager.java

@@ -140,7 +140,7 @@ public class TileSourceManager {
 					}
 				}
 			}
-			return randoms.toArray(new String[randoms.size()]);
+			return randoms.toArray(new String[0]);
 		}
 
 		public void setMinZoom(int minZoom) {
@@ -518,8 +518,8 @@ public class TileSourceManager {
 		}
 		if (override || !metainfo.exists()) {
 			BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(metainfo)));
-			for (String key : properties.keySet()) {
+			for (Map.Entry<String, String> entry : properties.entrySet()) {
-				writer.write("[" + key + "]\n" + properties.get(key) + "\n");
+				writer.write("[" + entry.getKey() + "]\n" + entry.getValue() + "\n");
 			}
 			writer.close();
 		}

OsmAnd-java/src/main/java/net/osmand/osm/MapRenderingTypes.java

@@ -96,8 +96,9 @@ public abstract class MapRenderingTypes {
 		Map<String, String> common = new HashMap<String, String>();
 		String ATTACHED_KEY = "seamark:attached";
 		String type = "";
-		for (String s : tags.keySet()) {
+		for (Entry<String, String> entry : tags.entrySet()) {
-			String value = tags.get(s);
+			String s = entry.getKey();
+			String value = entry.getValue();
 			if (s.equals("seamark:type")) {
 				type = value;
 				common.put(ATTACHED_KEY, openSeaType(value));

OsmAnd-java/src/main/java/net/osmand/osm/edit/EntityParser.java

@@ -33,9 +33,10 @@ public class EntityParser {
 		if (mo.getEnName(false).length() == 0) {
 			mo.setEnName(tags.get(OSMTagKey.NAME_EN.getValue()));
 		}
-		for (String ts : tags.keySet()) {
+		for (Map.Entry<String, String> entry : tags.entrySet()) {
+			String ts = entry.getKey();
 			if (ts.startsWith("name:") && !ts.equals(OSMTagKey.NAME_EN.getValue())) {
-				mo.setName(ts.substring(("name:").length()), tags.get(ts));
+				mo.setName(ts.substring(("name:").length()), entry.getValue());
 			}
 		}
 		if (mo.getName().length() == 0) {

OsmAnd-java/src/main/java/net/osmand/osm/io/NetworkUtils.java

@@ -63,8 +63,8 @@ public class NetworkUtils {
 		URL url;
 		try {
 			boolean firstPrm =!urlText.contains("?");
-			for (String key : additionalMapData.keySet()) {
+			for (Map.Entry<String, String> entry : additionalMapData.entrySet()) {
-				urlText += (firstPrm ? "?" : "&") + key + "=" + URLEncoder.encode(additionalMapData.get(key), "UTF-8");
+				urlText += (firstPrm ? "?" : "&") + entry.getKey() + "=" + URLEncoder.encode(entry.getValue(), "UTF-8");
 				firstPrm = false;
 			}
 			log.info("Start uploading file to " + urlText + " " +fileToUpload.getName());

OsmAnd-java/src/main/java/net/osmand/render/RenderingRule.java

@@ -70,7 +70,7 @@ public class RenderingRule {
 				i++;
 			}
 		}
-		properties = props.toArray(new RenderingRuleProperty[props.size()]);
+		properties = props.toArray(new RenderingRuleProperty[0]);
 	}
 	
 	private int getPropertyIndex(String property){

OsmAnd-java/src/main/java/net/osmand/render/RenderingRuleStorageProperties.java

@@ -318,7 +318,7 @@ public class RenderingRuleStorageProperties {
 	}
 	
 	public RenderingRuleProperty[] getPoperties() {
-		return rules.toArray(new RenderingRuleProperty[rules.size()]);
+		return rules.toArray(new RenderingRuleProperty[0]);
 	}
 	
 	public List<RenderingRuleProperty> getCustomRules() {

OsmAnd-java/src/main/java/net/osmand/render/RenderingRulesStorage.java

@@ -432,8 +432,7 @@ public class RenderingRulesStorage {
 				for(RenderingRule ch : caseChildren) {
 					List<RenderingRule> apply = applyRules;
 					if(!renderingRule.getIfChildren().isEmpty()) {
-						apply = new ArrayList<RenderingRule>();
+						apply = new ArrayList<>(renderingRule.getIfChildren());
-						apply.addAll(renderingRule.getIfChildren());
 						if(applyRules != null) {
 							apply.addAll(applyRules);
 						}
@@ -492,10 +491,10 @@ public class RenderingRulesStorage {
 	}
 	
 	public String[] getRenderingAttributeNames() {
-		return renderingAttributes.keySet().toArray(new String[renderingAttributes.size()]);
+		return renderingAttributes.keySet().toArray(new String[0]);
 	}
 	public RenderingRule[] getRenderingAttributeValues() {
-		return renderingAttributes.values().toArray(new RenderingRule[renderingAttributes.size()]);
+		return renderingAttributes.values().toArray(new RenderingRule[0]);
 	}
 	
 	public RenderingRule[] getRules(int state){

OsmAnd-java/src/main/java/net/osmand/render/RenderingRulesStoragePrinter.java

@@ -152,9 +152,9 @@ public class RenderingRulesStoragePrinter {
 		for (int i = 0; i < 15; i++) {
 			out.println("" + indent + ti + "RenderingRule rule" + i + " = null;");
 		}
-		for (String s : storage.renderingAttributes.keySet()) {
+		for (Entry<String, RenderingRule> entry : storage.renderingAttributes.entrySet()) {
-			generateRenderingRule(storage, out, indent + ti, "rule", 0, storage.renderingAttributes.get(s));
+			generateRenderingRule(storage, out, indent + ti, "rule", 0, entry.getValue());
-			out.println("" + indent + ti + "storage.renderingAttributes.put(" + javaString(s) + ", rule0);");
+			out.println("" + indent + ti + "storage.renderingAttributes.put(" + javaString(entry.getKey()) + ", rule0);");
 		}
 		out.println(""+indent +"}");
 	}
@@ -221,7 +221,7 @@ public class RenderingRulesStoragePrinter {
 				mp+=", ";
 			}
 		}
-		if(mp.equals("")) {
+		if(mp.isEmpty()) {
 			mp = "java.util.Collections.EMPTY_MAP";
 		} else {
 			mp = "createMap(" +mp +")";
@@ -242,9 +242,9 @@ public class RenderingRulesStoragePrinter {
 
 	private void printJavaInitConstants(RenderingRulesStorage storage, PrintStream out, String indent, String ti) {
 		out.println("\n" + indent + "public void initConstants() {");
-		for (String s : storage.renderingConstants.keySet()) {
+		for (Entry<String, String> entry : storage.renderingConstants.entrySet()) {
-			out.println("" + indent + ti + "storage.renderingConstants.put(" + javaString(s) + ", "
+			out.println("" + indent + ti + "storage.renderingConstants.put(" + javaString(entry.getKey()) + ", "
-					+ javaString(storage.renderingConstants.get(s)) + ");");
+					+ javaString(entry.getValue()) + ");");
 		}
 		out.println(""+indent +"}");
 	}

OsmAnd-java/src/main/java/net/osmand/render/RenderingRulesTransformer.java

@@ -80,7 +80,7 @@ public class RenderingRulesTransformer {
 		for (int i = 0; i < nl.getLength();) {
 			Element app = (Element) nl.item(i);
 			String pt = app.getAttribute("pattern");
-			if (!pt.equals("")) {
+			if (!pt.isEmpty()) {
 				if (!patterns.containsKey(pt)) {
 					throw new IllegalStateException("Pattern '" + pt + "' is not defined");
 				}

OsmAnd-java/src/main/java/net/osmand/router/GeneralRouter.java

@@ -754,21 +754,21 @@ public class GeneralRouter implements VehicleRouter {
 		}
 		
 		public RouteAttributeEvalRule[] getRules() {
-			return rules.toArray(new RouteAttributeEvalRule[rules.size()]);
+			return rules.toArray(new RouteAttributeEvalRule[0]);
 		}
 		
 		public String[] getParamKeys() {
 			if(paramContext == null) {
 				return new String[0];
 			}
-			return paramContext.vars.keySet().toArray(new String[paramContext.vars.size()]);
+			return paramContext.vars.keySet().toArray(new String[0]);
 		}
 		
 		public String[] getParamValues() {
 			if(paramContext == null) {
 				return new String[0];
 			}
-			return paramContext.vars.values().toArray(new String[paramContext.vars.size()]);
+			return paramContext.vars.values().toArray(new String[0]);
 		}
 		
 		private Object evaluate(RouteDataObject ro) {
@@ -988,19 +988,19 @@ public class GeneralRouter implements VehicleRouter {
 		
 		
 		public RouteAttributeExpression[] getExpressions() {
-			return expressions.toArray(new RouteAttributeExpression[expressions.size()]);
+			return expressions.toArray(new RouteAttributeExpression[0]);
 		}
 		
 		public String[] getParameters() {
-			return parameters.toArray(new String[parameters.size()]);
+			return parameters.toArray(new String[0]);
 		}
 		
 		public String[] getTagValueCondDefTag() {
-			return tagValueCondDefTag.toArray(new String[tagValueCondDefTag.size()]);
+			return tagValueCondDefTag.toArray(new String[0]);
 		}
 		
 		public String[] getTagValueCondDefValue() {
-			return tagValueCondDefValue.toArray(new String[tagValueCondDefValue.size()]);
+			return tagValueCondDefValue.toArray(new String[0]);
 		}
 		
 		public boolean[] getTagValueCondDefNot() {

OsmAnd-java/src/main/java/net/osmand/router/RoutePlannerFrontEnd.java

@@ -918,7 +918,7 @@ public class RoutePlannerFrontEnd {
 
 	private List<RouteSegmentResult> runNativeRouting(final RoutingContext ctx, RouteSegment recalculationEnd) throws IOException {
 		refreshProgressDistance(ctx);
-		RouteRegion[] regions = ctx.reverseMap.keySet().toArray(new BinaryMapRouteReaderAdapter.RouteRegion[ctx.reverseMap.size()]);
+		RouteRegion[] regions = ctx.reverseMap.keySet().toArray(new RouteRegion[0]);
 		ctx.checkOldRoutingFiles(ctx.startX, ctx.startY);
 		ctx.checkOldRoutingFiles(ctx.targetX, ctx.targetY);
 

OsmAnd-java/src/main/java/net/osmand/router/RouteResultPreparation.java

@@ -1717,7 +1717,7 @@ public class RouteResultPreparation {
 				}
 			}
 		}
-		Integer[] array = possibleTurns.toArray(new Integer[possibleTurns.size()]);
+		Integer[] array = possibleTurns.toArray(new Integer[0]);
 		Arrays.sort(array, new Comparator<Integer>() {
 
 			@Override

OsmAnd-java/src/main/java/net/osmand/router/RoutingContext.java

@@ -802,7 +802,7 @@ public class RoutingContext {
 	}
 	
 	public BinaryMapIndexReader[] getMaps() {
-		return map.keySet().toArray(new BinaryMapIndexReader[map.size()]);
+		return map.keySet().toArray(new BinaryMapIndexReader[0]);
 	}
 
 	public int getVisitedSegments() {

OsmAnd-java/src/main/java/net/osmand/router/TransportStopsRouteReader.java

@@ -325,9 +325,7 @@ public class TransportStopsRouteReader {
 			// merge first part
 			if (commonStopFirst < commonStopSecond
 					|| (commonStopFirst == commonStopSecond && firstSegment.get(0).isMissingStop())) {
-				for (int i = 0; i <= commonStopFirst; i++) {
+				firstSegment.subList(0, commonStopFirst + 1).clear();
-					firstSegment.remove(0);
-				}
 				for (int i = commonStopSecond; i >= 0; i--) {
 					firstSegment.add(0, segmentToMerge.get(i));
 				}

OsmAnd-java/src/main/java/net/osmand/search/core/SearchPhrase.java

@@ -720,7 +720,7 @@ public class SearchPhrase {
                 if (result.containsKey(currRegionName)) {
                     result.get(currRegionName).add(r);
                 } else {
-                    result.put(currRegionName, new ArrayList<>(Arrays.asList(r)));
+                    result.put(currRegionName, new ArrayList<>(Collections.singletonList(r)));
                 }
                 it.remove();
             }

OsmAnd-java/src/main/java/net/osmand/util/GeoPointParserUtil.java

@@ -62,7 +62,7 @@ public class GeoPointParserUtil {
 
 	private static Map<String, String> getQueryParameters(String query) {
 		final LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
-		if (query != null && !query.equals("")) {
+		if (query != null && !query.isEmpty()) {
 			String[] params = query.split("[&/]");
 			for (String p : params) {
 				String[] keyValue = p.split("=");
@@ -803,10 +803,10 @@ public class GeoPointParserUtil {
 				if (map.size() > 0)
 					uriString += "?";
 				int i = 0;
-				for (String key : map.keySet()) {
+				for (Map.Entry<String, String> entry : map.entrySet()) {
 					if (i > 0)
 						uriString += "&";
-					uriString += key + "=" + map.get(key);
+					uriString += entry.getKey() + "=" + entry.getValue();
 					i++;
 				}
 				return uriString;

OsmAnd-java/src/main/java/net/osmand/util/OpeningHoursParser.java

@@ -6,6 +6,7 @@ import java.text.DateFormatSymbols;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
+import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -1812,7 +1813,7 @@ public class OpeningHoursParser {
 		TokenType currentParse = TokenType.TOKEN_UNKNOWN;
 		TokenType currentParseParent = TokenType.TOKEN_UNKNOWN;
 		List<Token[]> listOfPairs = new ArrayList<>();
-		Set<TokenType> presentTokens = new HashSet<>();
+		Set<TokenType> presentTokens = EnumSet.noneOf(TokenType.class);
 		Token[] currentPair = new Token[2];
 		listOfPairs.add(currentPair);
 		Token prevToken = null;

OsmAnd/src/net/osmand/AndroidNetworkUtils.java

@@ -305,8 +305,8 @@ public class AndroidNetworkUtils {
 		try {
 			boolean firstPrm = !urlText.contains("?");
 			StringBuilder sb = new StringBuilder(urlText);
-			for (String key : additionalParams.keySet()) {
+			for (Map.Entry<String, String> entry : additionalParams.entrySet()) {
-				sb.append(firstPrm ? "?" : "&").append(key).append("=").append(URLEncoder.encode(additionalParams.get(key), "UTF-8"));
+				sb.append(firstPrm ? "?" : "&").append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue(), "UTF-8"));
 				firstPrm = false;
 			}
 			urlText = sb.toString();

OsmAnd/src/net/osmand/access/NavigationInfo.java

@@ -373,7 +373,7 @@ public class NavigationInfo implements OsmAndCompassListener, OsmAndLocationList
 				dialog.cancel();
 			}
 		});
-		info.setItems(attributes.toArray(new String[attributes.size()]), new DialogInterface.OnClickListener() {
+		info.setItems(attributes.toArray(new String[0]), new DialogInterface.OnClickListener() {
 			@Override
 			public void onClick(DialogInterface dialog, int which) {
 			}

OsmAnd/src/net/osmand/plus/AppVersionUpgradeOnInit.java

@@ -190,14 +190,15 @@ class AppVersionUpgradeOnInit {
 		migrateEnumPreferences();
 		SharedPreferences globalSharedPreferences = (SharedPreferences) settings.getGlobalPreferences();
 		Map<String, ?> globalPrefsMap = globalSharedPreferences.getAll();
-		for (String key : globalPrefsMap.keySet()) {
+		for (Map.Entry<String, ?> entry : globalPrefsMap.entrySet()) {
+			String key = entry.getKey();
 			OsmandPreference<?> pref = settings.getPreference(key);
 			if (pref instanceof CommonPreference) {
 				CommonPreference<?> commonPreference = (CommonPreference<?>) pref;
 				if (!commonPreference.isGlobal()) {
 					for (ApplicationMode mode : ApplicationMode.allPossibleValues()) {
 						if (!commonPreference.isSetForMode(mode) && !commonPreference.hasDefaultValueForMode(mode)) {
-							settings.setPreference(key, globalPrefsMap.get(key), mode);
+							settings.setPreference(key, entry.getValue(), mode);
 						}
 					}
 				}
@@ -205,12 +206,13 @@ class AppVersionUpgradeOnInit {
 		}
 		SharedPreferences defaultProfilePreferences = (SharedPreferences) settings.getProfilePreferences(ApplicationMode.DEFAULT);
 		Map<String, ?> defaultPrefsMap = defaultProfilePreferences.getAll();
-		for (String key : defaultPrefsMap.keySet()) {
+		for (Map.Entry<String, ?> entry : defaultPrefsMap.entrySet()) {
+			String key = entry.getKey();
 			OsmandPreference<?> pref = settings.getPreference(key);
 			if (pref instanceof CommonPreference) {
 				CommonPreference<?> commonPreference = (CommonPreference<?>) pref;
 				if (commonPreference.isGlobal() && !commonPreference.isSet()) {
-					settings.setPreference(key, defaultPrefsMap.get(key));
+					settings.setPreference(key, entry.getValue());
 				}
 			}
 		}

OsmAnd/src/net/osmand/plus/ContextMenuAdapter.java

@@ -208,7 +208,7 @@ public class ContextMenuAdapter {
 		}
 		items.removeAll(itemsToRemove);
 		return new ContextMenuArrayAdapter(activity, layoutId, R.id.title,
-				items.toArray(new ContextMenuItem[items.size()]), app, lightTheme, changeAppModeListener);
+				items.toArray(new ContextMenuItem[0]), app, lightTheme, changeAppModeListener);
 	}
 
 	public class ContextMenuArrayAdapter extends ArrayAdapter<ContextMenuItem> {
@@ -643,7 +643,7 @@ public class ContextMenuAdapter {
 	}
 
 	public static OnItemDeleteAction makeDeleteAction(final List<? extends OsmandPreference> prefs) {
-		return makeDeleteAction(prefs.toArray(new OsmandPreference[prefs.size()]));
+		return makeDeleteAction(prefs.toArray(new OsmandPreference[0]));
 	}
 
 	private static void resetSetting(ApplicationMode appMode, OsmandPreference preference, boolean profileOnly) {

OsmAnd/src/net/osmand/plus/FavouritesDbHelper.java

@@ -261,10 +261,11 @@ public class FavouritesDbHelper {
 
 	private boolean merge(Map<String, FavouritePoint> source, Map<String, FavouritePoint> destination) {
 		boolean changed = false;
-		for (String ks : source.keySet()) {
+		for (Map.Entry<String, FavouritePoint> entry : source.entrySet()) {
+			String ks = entry.getKey();
 			if (!destination.containsKey(ks)) {
 				changed = true;
-				destination.put(ks, source.get(ks));
+				destination.put(ks, entry.getValue());
 			}
 		}
 		return changed;
@@ -360,7 +361,7 @@ public class FavouritesDbHelper {
 	}
 
 	public boolean addFavourite(FavouritePoint p, boolean saveImmediately) {
-		if (p.getName().equals("") && flatGroups.containsKey(p.getCategory())) {
+		if (p.getName().isEmpty() && flatGroups.containsKey(p.getCategory())) {
 			return true;
 		}
 		if (!p.isAddressSpecified()) {
@@ -369,7 +370,7 @@ public class FavouritesDbHelper {
 		context.getSettings().SHOW_FAVORITES.set(true);
 		FavoriteGroup group = getOrCreateGroup(p, 0);
 
-		if (!p.getName().equals("")) {
+		if (!p.getName().isEmpty()) {
 			p.setVisible(group.visible);
 			if (FavouritePoint.SpecialPointType.PARKING.equals(p.getSpecialPointType())) {
 				p.setColor(ContextCompat.getColor(context, R.color.parking_icon_background));
@@ -712,9 +713,10 @@ public class FavouritesDbHelper {
 
 	public boolean isGroupVisible(String name) {
 		String nameLowercase = name.toLowerCase();
-		for (String groupName : flatGroups.keySet()) {
+		for (Map.Entry<String, FavoriteGroup> entry : flatGroups.entrySet()) {
+			String groupName = entry.getKey();
 			if (groupName.toLowerCase().equals(nameLowercase) || FavoriteGroup.getDisplayName(context, groupName).equals(name)) {
-				return flatGroups.get(groupName).isVisible();
+				return entry.getValue().isVisible();
 			}
 		}
 		return false;
@@ -968,7 +970,7 @@ public class FavouritesDbHelper {
 							p.setName(name);
 							p.setCategory(cat);
 							FavoriteGroup group = getOrCreateGroup(p, 0);
-							if (!name.equals("")) {
+							if (!name.isEmpty()) {
 								p.setLatitude(query.getDouble(2));
 								p.setLongitude(query.getDouble(3));
 								group.points.add(p);
@@ -1012,7 +1014,7 @@ public class FavouritesDbHelper {
 
 
 	public boolean addFavouriteDB(FavouritePoint p) {
-		if (p.getName().equals("") && flatGroups.containsKey(p.getCategory())) {
+		if (p.getName().isEmpty() && flatGroups.containsKey(p.getCategory())) {
 			return true;
 		}
 		SQLiteConnection db = openConnection(false);
@@ -1022,7 +1024,7 @@ public class FavouritesDbHelper {
 						"INSERT INTO " + FAVOURITE_TABLE_NAME + " (" + FAVOURITE_COL_NAME + ", " + FAVOURITE_COL_CATEGORY + ", "
 								+ FAVOURITE_COL_LAT + ", " + FAVOURITE_COL_LON + ")" + " VALUES (?, ?, ?, ?)", new Object[]{p.getName(), p.getCategory(), p.getLatitude(), p.getLongitude()}); //$NON-NLS-1$ //$NON-NLS-2$
 				FavoriteGroup group = getOrCreateGroup(p, 0);
-				if (!p.getName().equals("")) {
+				if (!p.getName().isEmpty()) {
 					p.setVisible(group.visible);
 					p.setColor(group.color);
 					group.points.add(p);

OsmAnd/src/net/osmand/plus/GpxSelectionHelper.java

@@ -408,10 +408,10 @@ public class GpxSelectionHelper {
 			boolean split = true;
 			if (group.splitDistance > 0) {
 				List<GPXTrackAnalysis> trackSegments = r.splitByDistance(group.splitDistance, joinSegments);
-				as = trackSegments.toArray(new GPXTrackAnalysis[trackSegments.size()]);
+				as = trackSegments.toArray(new GPXTrackAnalysis[0]);
 			} else if (group.splitTime > 0) {
 				List<GPXTrackAnalysis> trackSegments = r.splitByTime(group.splitTime, joinSegments);
-				as = trackSegments.toArray(new GPXTrackAnalysis[trackSegments.size()]);
+				as = trackSegments.toArray(new GPXTrackAnalysis[0]);
 			} else {
 				split = false;
 				as = new GPXTrackAnalysis[] {GPXTrackAnalysis.segment(0, r)};

OsmAnd/src/net/osmand/plus/OsmAndFormatter.java

@@ -63,7 +63,7 @@ public class OsmAndFormatter {
 	private static final char WEST = 'W';
 	private static final char EAST = 'E';
 
-	{
+	static {
 		fixed2.setMinimumFractionDigits(2);
 		fixed1.setMinimumFractionDigits(1);
 		fixed1.setMinimumIntegerDigits(1);

OsmAnd/src/net/osmand/plus/OsmandApplication.java

@@ -412,8 +412,8 @@ public class OsmandApplication extends MultiDexApplication {
 		if (defaultLocale == null) {
 			defaultLocale = Locale.getDefault();
 		}
-		if (!"".equals(lang)) {
+		if (!Algorithms.isEmpty(lang)) {
-			if (!"".equals(country)) {
+			if (!Algorithms.isEmpty(country)) {
 				preferredLocale = new Locale(lang, country);
 			} else {
 				preferredLocale = new Locale(lang);
@@ -421,9 +421,9 @@ public class OsmandApplication extends MultiDexApplication {
 		}
 		Locale selectedLocale = null;
 
-		if (!"".equals(lang) && !config.locale.equals(preferredLocale)) {
+		if (!Algorithms.isEmpty(lang) && !config.locale.equals(preferredLocale)) {
 			selectedLocale = preferredLocale;
-		} else if ("".equals(lang) && defaultLocale != null && Locale.getDefault() != defaultLocale) {
+		} else if (Algorithms.isEmpty(lang) && defaultLocale != null && Locale.getDefault() != defaultLocale) {
 			selectedLocale = defaultLocale;
 			preferredLocale = null;
 		}
@@ -807,17 +807,17 @@ public class OsmandApplication extends MultiDexApplication {
 		}
 		return s;
 	}
-	
+
 	public void setLanguage(Context context) {
 		if (preferredLocale != null) {
 			Configuration config = context.getResources().getConfiguration();
 			String lang = preferredLocale.getLanguage();
-			if (!"".equals(lang) && !config.locale.getLanguage().equals(lang)) {
+			if (!Algorithms.isEmpty(lang) && !config.locale.getLanguage().equals(lang)) {
 				preferredLocale = new Locale(lang);
 				Locale.setDefault(preferredLocale);
 				config.locale = preferredLocale;
 				context.getResources().updateConfiguration(config, context.getResources().getDisplayMetrics());
-			} else if("".equals(lang) && defaultLocale != null && Locale.getDefault() != defaultLocale) {
+			} else if (Algorithms.isEmpty(lang) && defaultLocale != null && Locale.getDefault() != defaultLocale) {
 				Locale.setDefault(defaultLocale);
 				config.locale = defaultLocale;
 				getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());

OsmAnd/src/net/osmand/plus/TargetPointsHelper.java

@@ -309,9 +309,7 @@ public class TargetPointsHelper {
 	public List<TargetPoint> getIntermediatePointsNavigation() {
 		List<TargetPoint> intermediatePoints = new ArrayList<>();
 		if (settings.USE_INTERMEDIATE_POINTS_NAVIGATION.get()) {
-			for (TargetPoint t : this.intermediatePoints) {
+			intermediatePoints.addAll(this.intermediatePoints);
-				intermediatePoints.add(t);
-			}
 		}
 		return intermediatePoints;
 	}
@@ -347,8 +345,7 @@ public class TargetPointsHelper {
 	}
 
 	public List<TargetPoint> getIntermediatePointsWithTarget() {
-		List<TargetPoint> res = new ArrayList<>();
+		List<TargetPoint> res = new ArrayList<>(this.intermediatePoints);
-		res.addAll(this.intermediatePoints);
 		if(pointToNavigate != null) {
 			res.add(pointToNavigate);
 		}

OsmAnd/src/net/osmand/plus/activities/HelpActivity.java

@@ -176,7 +176,7 @@ public class HelpActivity extends OsmandActionBarActivity implements AdapterView
 				"feature_articles/osmand-3-8-released.html"));
 
 		String releasedate = "";
-		if (!this.getString(R.string.app_edition).equals("")) {
+		if (!this.getString(R.string.app_edition).isEmpty()) {
 			releasedate = ", " + this.getString(R.string.shared_string_release).toLowerCase() + ": " + this.getString(R.string.app_edition);
 		}
 		String version = Version.getFullVersion(getMyApplication()) + releasedate;

OsmAnd/src/net/osmand/plus/activities/MapActivityActions.java

@@ -1148,7 +1148,7 @@ public class MapActivityActions implements DialogProvider {
 		items.add(getString(R.string.show_location));
 		items.add(getString(R.string.shared_string_show_details));
 		AlertDialog.Builder menu = new AlertDialog.Builder(mapActivity);
-		menu.setItems(items.toArray(new String[items.size()]), new DialogInterface.OnClickListener() {
+		menu.setItems(items.toArray(new String[0]), new DialogInterface.OnClickListener() {
 			@Override
 			public void onClick(DialogInterface dialog, int item) {
 				dialog.dismiss();

OsmAnd/src/net/osmand/plus/activities/SavingTrackHelper.java

@@ -208,11 +208,13 @@ public class SavingTrackHelper extends SQLiteOpenHelper {
 				Map<String, GPXFile> data = collectRecordedData();
 
 				// save file
-				for (final String f : data.keySet()) {
+				for (final Map.Entry<String, GPXFile> entry : data.entrySet()) {
+					final String f = entry.getKey();
+					GPXFile gpx = entry.getValue();
 					log.debug("Filename: " + f);
 					File fout = new File(dir, f + IndexConstants.GPX_FILE_EXT);
-					if (!data.get(f).isEmpty()) {
+					if (!gpx.isEmpty()) {
-						WptPt pt = data.get(f).findPointToShow();
+						WptPt pt = gpx.findPointToShow();
 						String fileName = f + "_" + new SimpleDateFormat("HH-mm_EEE", Locale.US).format(new Date(pt.time)); //$NON-NLS-1$
 						Integer trackStorageDirectory = ctx.getSettings().TRACK_STORAGE_DIRECTORY.get();
 						if (!OsmandSettings.REC_DIRECTORY.equals(trackStorageDirectory)) {
@@ -235,13 +237,12 @@ public class SavingTrackHelper extends SQLiteOpenHelper {
 						}
 					}
 
-					Exception warn = GPXUtilities.writeGpxFile(fout, data.get(f));
+					Exception warn = GPXUtilities.writeGpxFile(fout, gpx);
 					if (warn != null) {
 						warnings.add(warn.getMessage());
 						return new SaveGpxResult(warnings, new ArrayList<String>());
 					}
 
-					GPXFile gpx = data.get(f);
 					GPXTrackAnalysis analysis = gpx.getAnalysis(fout.lastModified());
 					GpxDataItem item = new GpxDataItem(fout, analysis);
 					ctx.getGpxDbHelper().add(item);

OsmAnd/src/net/osmand/plus/activities/actions/StartGPSStatus.java

@@ -165,7 +165,7 @@ public class StartGPSStatus extends OsmAndAction {
 			// if (g.activity.length() == 0) {
 				PackageManager pm = mapActivity.getPackageManager();
 				try {
-					String appName = !g.paidAppName.equals("") &&
+					String appName = !g.paidAppName.isEmpty() &&
 							g.installed(mapActivity, g.paidAppName) ? g.paidAppName : g.appName;
 					intent = pm.getLaunchIntentForPackage(appName);
 				} catch (RuntimeException e) {

OsmAnd/src/net/osmand/plus/activities/search/SearchPoiFilterFragment.java

@@ -166,9 +166,7 @@ public class SearchPoiFilterFragment extends OsmAndListFragment implements Searc
 				}
 
 			});
-			for (AbstractPoiType p : res) {
+			filters.addAll(res);
-				filters.add(p);
-			}
 			filters.add(poiFilters.getSearchByNamePOIFilter());
 			if (OsmandPlugin.getEnabledPlugin(OsmandRasterMapsPlugin.class) != null) {
 				filters.add(poiFilters.getNominatimPOIFilter());

OsmAnd/src/net/osmand/plus/api/FileSettingsAPIImpl.java

@@ -25,9 +25,9 @@ public class FileSettingsAPIImpl implements SettingsAPI {
 			Properties props = new Properties();
 			FileInputStream fis = new FileInputStream(file);
 			props.load(fis);
-			for (Object key : props.keySet()) {
+			for (Entry<Object, Object> entry : props.entrySet()) {
-				String k = key.toString();
+				String k = entry.getKey().toString();
-				map.put(k, props.get(key));
+				map.put(k, entry.getValue());
 			}
 		}
 	}

OsmAnd/src/net/osmand/plus/audionotes/AudioVideoNotesPlugin.java

@@ -1860,7 +1860,7 @@ public class AudioVideoNotesPlugin extends OsmandPlugin {
 	protected Recording[] getRecordingsSorted() {
 		checkRecordings();
 		Collection<Recording> allObjects = getAllRecordings();
-		Recording[] res = allObjects.toArray(new Recording[allObjects.size()]);
+		Recording[] res = allObjects.toArray(new Recording[0]);
 		Arrays.sort(res, new Comparator<Recording>() {
 
 			@Override

OsmAnd/src/net/osmand/plus/dashboard/DashChooseAppDirFragment.java

@@ -223,7 +223,7 @@ public class DashChooseAppDirFragment {
 			paths.add("");
 			types.add(OsmandSettings.EXTERNAL_STORAGE_TYPE_SPECIFIED);
 
-			editalert.setSingleChoiceItems(items.toArray(new String[items.size()]), selected,
+			editalert.setSingleChoiceItems(items.toArray(new String[0]), selected,
 					new DialogInterface.OnClickListener() {
 
 						@Override

OsmAnd/src/net/osmand/plus/development/LogcatActivity.java

@@ -32,6 +32,7 @@ import java.io.IOException;
 import java.io.InputStreamReader;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
@@ -298,9 +299,7 @@ public class LogcatActivity extends ActionBarProgressActivity {
 				LogcatActivity activity = logcatActivity.get();
 				if (activity != null) {
 					boolean autoscroll = !activity.recyclerView.canScrollVertically(1);
-					for(String s : values) {
+					activity.logs.addAll(Arrays.asList(values));
-						activity.logs.add(s);
-					}
 					activity.adapter.notifyDataSetChanged();
 					if(autoscroll) {
 						activity.recyclerView.scrollToPosition(activity.logs.size() - 1);

OsmAnd/src/net/osmand/plus/dialogs/ConfigureMapMenu.java

@@ -404,7 +404,7 @@ public class ConfigureMapMenu {
 						bld.setTitle(R.string.map_magnifier);
 						bld.setNegativeButton(R.string.shared_string_dismiss, null);
 						DialogListItemAdapter dialogAdapter = DialogListItemAdapter.createSingleChoiceAdapter(
-								values.toArray(new String[values.size()]), nightMode, i, app, selectedProfileColor, themeRes, new View.OnClickListener() {
+								values.toArray(new String[0]), nightMode, i, app, selectedProfileColor, themeRes, new View.OnClickListener() {
 									@Override
 									public void onClick(View v) {
 										int which = (int) v.getTag();
@@ -481,7 +481,7 @@ public class ConfigureMapMenu {
 				.createItem());
 
 		String localeDescr = activity.getMyApplication().getSettings().MAP_PREFERRED_LOCALE.get();
-		localeDescr = localeDescr == null || localeDescr.equals("") ? activity.getString(R.string.local_map_names)
+		localeDescr = localeDescr == null || localeDescr.isEmpty() ? activity.getString(R.string.local_map_names)
 				: localeDescr;
 		adapter.addItem(new ContextMenuItem.ItemBuilder().setTitleId(R.string.map_locale, activity)
 				.setId(MAP_LANGUAGE_ID)
@@ -570,7 +570,7 @@ public class ConfigureMapMenu {
 										txtIds[index]);
 								refreshMapComplete(activity);
 								String localeDescr = txtIds[index];
-								localeDescr = localeDescr == null || localeDescr.equals("") ? activity
+								localeDescr = localeDescr == null || localeDescr.isEmpty() ? activity
 										.getString(R.string.local_map_names) : localeDescr;
 								adapter.getItem(pos).setDescription(localeDescr);
 								ad.notifyDataSetInvalidated();
@@ -639,7 +639,7 @@ public class ConfigureMapMenu {
 				return mp.get(lhs).compareTo(mp.get(rhs));
 			}
 		});
-		return lst.toArray(new String[lst.size()]);
+		return lst.toArray(new String[0]);
 	}
 
 	public static String[] getMapNamesValues(Context ctx, String[] ids) {

OsmAnd/src/net/osmand/plus/download/DownloadFileHelper.java

@@ -349,7 +349,7 @@ public class DownloadFileHelper {
 		private int currentRead = 0;
 
 		public CountingMultiInputStream(List<InputStream> streams) {
-			this.delegate = streams.toArray(new InputStream[streams.size()]);
+			this.delegate = streams.toArray(new InputStream[0]);
 		}
 		
 		@Override

OsmAnd/src/net/osmand/plus/download/ui/LocalIndexesFragment.java

@@ -582,7 +582,7 @@ public class LocalIndexesFragment extends OsmandExpandableListFragment implement
 			operationTask = null;
 		}
 		if (operationTask != null) {
-			operationTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, selectedItems.toArray(new LocalIndexInfo[selectedItems.size()]));
+			operationTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, selectedItems.toArray(new LocalIndexInfo[0]));
 		}
 		if (actionMode != null) {
 			actionMode.finish();

OsmAnd/src/net/osmand/plus/download/ui/UpdatesIndexFragment.java

@@ -166,12 +166,12 @@ public class UpdatesIndexFragment extends OsmAndListFragment implements Download
 						dialog.setPositiveButton(R.string.shared_string_update, new DialogInterface.OnClickListener() {
 							@Override
 							public void onClick(DialogInterface dialog, int which) {
-								getMyActivity().startDownload(indexItems.toArray(new IndexItem[indexItems.size()]));
+								getMyActivity().startDownload(indexItems.toArray(new IndexItem[0]));
 							}
 						});
 						dialog.create().show();
 					} else {
-						getMyActivity().startDownload(indexItems.toArray(new IndexItem[indexItems.size()]));
+						getMyActivity().startDownload(indexItems.toArray(new IndexItem[0]));
 					}
 				}
 			});

OsmAnd/src/net/osmand/plus/helpers/ExternalApiHelper.java

@@ -871,7 +871,7 @@ public class ExternalApiHelper {
 			searchTypes.add(HOUSE);
 			searchTypes.add(STREET_INTERSECTION);
 		}
-		searchSettings = searchSettings.setSearchTypes(searchTypes.toArray(new ObjectType[searchTypes.size()]));
+		searchSettings = searchSettings.setSearchTypes(searchTypes.toArray(new ObjectType[0]));
 
 		core.search(searchQuery, false, null, searchSettings);
 	}

OsmAnd/src/net/osmand/plus/helpers/MapMarkerDialogHelper.java

@@ -101,7 +101,7 @@ public class MapMarkerDialogHelper {
 		String desc = OsmAndFormatter.getFormattedDate(app, marker.creationDate);
 		String markerGroupName = marker.groupName;
 		if (markerGroupName != null) {
-			if (markerGroupName.equals("")) {
+			if (markerGroupName.isEmpty()) {
 				markerGroupName = app.getString(R.string.shared_string_favorites);
 			}
 			desc += " • " + markerGroupName;

OsmAnd/src/net/osmand/plus/importfiles/ImportHelper.java

@@ -513,10 +513,9 @@ public class ImportHelper {
 
 	private File getFileToSave(final String fileName, final File importDir, final WptPt pt) {
 		final StringBuilder builder = new StringBuilder(fileName);
-		if ("".equals(fileName)) {
+		if (Algorithms.isEmpty(fileName)) {
 			builder.append("import_").append(new SimpleDateFormat("HH-mm_EEE", Locale.US).format(new Date(pt.time))).append(GPX_FILE_EXT); //$NON-NLS-1$
-		}
+		} else if (fileName.endsWith(KML_SUFFIX)) {
-		if (fileName.endsWith(KML_SUFFIX)) {
 			builder.replace(builder.length() - KML_SUFFIX.length(), builder.length(), GPX_FILE_EXT);
 		} else if (fileName.endsWith(KMZ_SUFFIX)) {
 			builder.replace(builder.length() - KMZ_SUFFIX.length(), builder.length(), GPX_FILE_EXT);

OsmAnd/src/net/osmand/plus/mapcontextmenu/MenuBuilder.java

@@ -367,8 +367,7 @@ public class MenuBuilder {
 					@Override
 					public void onFinish(List<ImageCard> cardList) {
 						if (!isHidden()) {
-							List<AbstractCard> cards = new ArrayList<>();
+							List<AbstractCard> cards = new ArrayList<AbstractCard>(cardList);
-							cards.addAll(cardList);
 							if (cardList.size() == 0) {
 								cards.add(new NoImagesCard(mapActivity));
 							}

OsmAnd/src/net/osmand/plus/mapillary/MapillaryFiltersFragment.java

@@ -123,7 +123,7 @@ public class MapillaryFiltersFragment extends BaseOsmAndFragment {
         final DelayAutoCompleteTextView textView = (DelayAutoCompleteTextView) view.findViewById(R.id.auto_complete_text_view);
         textView.setAdapter(new MapillaryAutoCompleteAdapter(getContext(), R.layout.auto_complete_suggestion, getMyApplication()));
         String selectedUsername = settings.MAPILLARY_FILTER_USERNAME.get();
-        if (!selectedUsername.equals("") && settings.USE_MAPILLARY_FILTER.get()) {
+        if (!selectedUsername.isEmpty() && settings.USE_MAPILLARY_FILTER.get()) {
             textView.setText(selectedUsername);
             textView.setSelection(selectedUsername.length());
         }
@@ -261,16 +261,16 @@ public class MapillaryFiltersFragment extends BaseOsmAndFragment {
                 String dateFrom = dateFromEt.getText().toString();
                 String dateTo = dateToEt.getText().toString();
 
-                if (!settings.MAPILLARY_FILTER_USERNAME.get().equals("") || !dateFrom.equals("") || !dateTo.equals("") || settings.MAPILLARY_FILTER_PANO.get()) {
+                if (!settings.MAPILLARY_FILTER_USERNAME.get().isEmpty() || !dateFrom.isEmpty() || !dateTo.isEmpty() || settings.MAPILLARY_FILTER_PANO.get()) {
                     settings.USE_MAPILLARY_FILTER.set(true);
                 }
-                if (dateFrom.equals("")) {
+                if (dateFrom.isEmpty()) {
                     settings.MAPILLARY_FILTER_FROM_DATE.set(0L);
                 }
-                if (dateTo.equals("")) {
+                if (dateTo.isEmpty()) {
                     settings.MAPILLARY_FILTER_TO_DATE.set(0L);
                 }
-                if (!username.equals("") && settings.MAPILLARY_FILTER_USERNAME.get().equals("")) {
+                if (!username.isEmpty() && settings.MAPILLARY_FILTER_USERNAME.get().isEmpty()) {
                     view.findViewById(R.id.warning_linear_layout).setVisibility(View.VISIBLE);
                 } else {
                     mapActivity.getDashboard().hideDashboard();

OsmAnd/src/net/osmand/plus/mapillary/MapillaryVectorLayer.java

@@ -205,7 +205,7 @@ class MapillaryVectorLayer extends MapTileLayer implements MapillaryLayer, ICont
 		long to = settings.MAPILLARY_FILTER_TO_DATE.get();
 		boolean pano = settings.MAPILLARY_FILTER_PANO.get();
 
-		if (!userKey.equals("")) {
+		if (!userKey.isEmpty()) {
 			String key = (String) userData.get("userkey");
 			if (!userKey.equals(key)) {
 				return true;

OsmAnd/src/net/osmand/plus/mapmarkers/DirectionIndicationDialogFragment.java

@@ -277,7 +277,7 @@ public class DirectionIndicationDialogFragment extends BaseOsmAndDialogFragment
 				}
 			}
 			((ImageView) mainView.findViewById(R.id.action_bar_image))
-					.setImageDrawable(new LayerDrawable(imgList.toArray(new Drawable[imgList.size()])));
+					.setImageDrawable(new LayerDrawable(imgList.toArray(new Drawable[0])));
 		} else {
 			mainView.findViewById(R.id.action_bar_image_container).setVisibility(View.GONE);
 		}

OsmAnd/src/net/osmand/plus/mapmarkers/SelectWptCategoriesBottomSheetDialogFragment.java

@@ -81,7 +81,8 @@ public class SelectWptCategoriesBottomSheetDialogFragment extends MenuBottomShee
 
 		Map<String, List<WptPt>> pointsByCategories = gpxFile.getPointsByCategories();
 
-		for (String category : pointsByCategories.keySet()) {
+		for (Map.Entry<String, List<WptPt>> entry : pointsByCategories.entrySet()) {
+			String category = entry.getKey();
 			final BottomSheetItemWithCompoundButton[] categoryItem = new BottomSheetItemWithCompoundButton[1];
 			categoryItem[0] = (BottomSheetItemWithCompoundButton) new BottomSheetItemWithCompoundButton.Builder()
 					.setChecked(!isUpdateMode || (categories != null && categories.contains(category)))
@@ -96,9 +97,9 @@ public class SelectWptCategoriesBottomSheetDialogFragment extends MenuBottomShee
 						}
 					})
 					.setCompoundButtonColorId(activeColorResId)
-					.setDescription(String.valueOf(pointsByCategories.get(category).size()))
+					.setDescription(String.valueOf(entry.getValue().size()))
 					.setIcon(getContentIcon(R.drawable.ic_action_folder))
-					.setTitle(category.equals("") ? getString(R.string.shared_string_waypoints) : category)
+					.setTitle(category.isEmpty() ? getString(R.string.shared_string_waypoints) : category)
 					.setLayoutId(R.layout.bottom_sheet_item_with_descr_and_checkbox_56dp)
 					.setTag(category)
 					.setOnClickListener(new View.OnClickListener() {

OsmAnd/src/net/osmand/plus/mapmarkers/adapters/MapMarkersActiveAdapter.java

@@ -131,7 +131,7 @@ public class MapMarkersActiveAdapter extends RecyclerView.Adapter<MapMarkerItemV
 
 		String descr;
 		if ((descr = marker.groupName) != null) {
-			if (descr.equals("")) {
+			if (descr.isEmpty()) {
 				descr = mapActivity.getString(R.string.shared_string_favorites);
 			}
 		} else {

OsmAnd/src/net/osmand/plus/mapmarkers/adapters/MapMarkersGroupsAdapter.java

@@ -403,7 +403,7 @@ public class MapMarkersGroupsAdapter extends RecyclerView.Adapter<RecyclerView.V
 				final GroupHeader groupHeader = (GroupHeader) header;
 				final MapMarkersGroup group = groupHeader.getGroup();
 				String groupName = group.getName();
-				if (groupName.equals("")) {
+				if (groupName.isEmpty()) {
 					groupName = app.getString(R.string.shared_string_favorites);
 				} else if (group.getType() == MapMarkersGroup.GPX_TYPE) {
 					groupName = groupName.replace(IndexConstants.GPX_FILE_EXT, "").replace("/", " ").replace("_", " ");
@@ -579,7 +579,7 @@ public class MapMarkersGroupsAdapter extends RecyclerView.Adapter<RecyclerView.V
 			Iterator<String> it = categories.iterator();
 			while (it.hasNext()) {
 				String category = it.next();
-				if (category.equals("")) {
+				if (category.isEmpty()) {
 					category = app.getResources().getString(R.string.shared_string_waypoints);
 				}
 				sb.append(category);

OsmAnd/src/net/osmand/plus/mapmarkers/adapters/MapMarkersHistoryAdapter.java

@@ -145,7 +145,7 @@ public class MapMarkersHistoryAdapter extends RecyclerView.Adapter<RecyclerView.
 			String desc = app.getString(R.string.passed, OsmAndFormatter.getFormattedDate(app, marker.visitedDate));
 			String markerGroupName = marker.groupName;
 			if (markerGroupName != null) {
-				if (markerGroupName.equals("")) {
+				if (markerGroupName.isEmpty()) {
 					markerGroupName = app.getString(R.string.shared_string_favorites);
 				}
 				desc += " • " + markerGroupName;

OsmAnd/src/net/osmand/plus/mapmarkers/adapters/MapMarkersListAdapter.java

@@ -197,7 +197,7 @@ public class MapMarkersListAdapter extends RecyclerView.Adapter<MapMarkerItemVie
 
 			String descr;
 			if ((descr = marker.groupName) != null) {
-				if (descr.equals("")) {
+				if (descr.isEmpty()) {
 					descr = mapActivity.getString(R.string.shared_string_favorites);
 				}
 			} else {

OsmAnd/src/net/osmand/plus/mapmarkers/adapters/TracksGroupsAdapter.java

@@ -57,7 +57,7 @@ public class TracksGroupsAdapter extends GroupsAdapter {
 			Iterator<String> it = categories.iterator();
 			while (it.hasNext()) {
 				String category = it.next();
-				if (!category.equals("")) {
+				if (!category.isEmpty()) {
 					sb.append(category);
 					if (it.hasNext()) {
 						sb.append(", ");

OsmAnd/src/net/osmand/plus/monitoring/OsmandMonitoringPlugin.java

@@ -73,7 +73,7 @@ public class OsmandMonitoringPlugin extends OsmandPlugin {
 		super(app);
 		liveMonitoringHelper = new LiveMonitoringHelper(app);
 		final List<ApplicationMode> am = ApplicationMode.allPossibleValues();
-		ApplicationMode.regWidgetVisibility("monitoring", am.toArray(new ApplicationMode[am.size()]));
+		ApplicationMode.regWidgetVisibility("monitoring", am.toArray(new ApplicationMode[0]));
 		settings = app.getSettings();
 		pluginPreferences.add(settings.SAVE_TRACK_TO_GPX);
 		pluginPreferences.add(settings.SAVE_TRACK_INTERVAL);

OsmAnd/src/net/osmand/plus/myplaces/AvailableGPXFragment.java

@@ -554,7 +554,7 @@ public class AvailableGPXFragment extends OsmandExpandableListFragment implement
 	public void doAction(int actionResId) {
 		if (actionResId == R.string.shared_string_delete) {
 			operationTask = new DeleteGpxTask();
-			operationTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, selectedItems.toArray(new GpxInfo[selectedItems.size()]));
+			operationTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, selectedItems.toArray(new GpxInfo[0]));
 		} else {
 			operationTask = null;
 		}
@@ -1009,7 +1009,7 @@ public class AvailableGPXFragment extends OsmandExpandableListFragment implement
 				List<GpxInfo> progress = new ArrayList<>();
 				loadGPXFolder(mapPath, result, loadTask, progress, "");
 				if (!progress.isEmpty()) {
-					loadTask.loadFile(progress.toArray(new GpxInfo[progress.size()]));
+					loadTask.loadFile(progress.toArray(new GpxInfo[0]));
 				}
 			}
 		}
@@ -1029,7 +1029,7 @@ public class AvailableGPXFragment extends OsmandExpandableListFragment implement
 					result.add(info);
 					progress.add(info);
 					if (progress.size() > 7) {
-						loadTask.loadFile(progress.toArray(new GpxInfo[progress.size()]));
+						loadTask.loadFile(progress.toArray(new GpxInfo[0]));
 						progress.clear();
 					}
 				}
@@ -1475,7 +1475,7 @@ public class AvailableGPXFragment extends OsmandExpandableListFragment implement
 					list.add(GPXDataSetType.SLOPE);
 				}
 				if (list.size() > 0) {
-					gpxItem.chartTypes = list.toArray(new GPXDataSetType[list.size()]);
+					gpxItem.chartTypes = list.toArray(new GPXDataSetType[0]);
 				}
 				final OsmandSettings settings = app.getSettings();
 				settings.setMapLocationToShow(gpxItem.locationStart.lat, gpxItem.locationStart.lon,

OsmAnd/src/net/osmand/plus/myplaces/TrackSegmentFragment.java

@@ -410,7 +410,7 @@ public class TrackSegmentFragment extends OsmAndListFragment implements TrackBit
 					tabTypeList.add(GPXTabItemType.GPX_TAB_ITEM_SPEED);
 				}
 			}
-			tabTypes = tabTypeList.toArray(new GPXTabItemType[tabTypeList.size()]);
+			tabTypes = tabTypeList.toArray(new GPXTabItemType[0]);
 
 			Context context = tabs.getContext();
 			titles = new String[tabTypes.length];

OsmAnd/src/net/osmand/plus/osmedit/AddPOIAction.java

@@ -222,8 +222,8 @@ public class AddPOIAction extends QuickAction {
 		}
 		addPoiToStringSet(getPoiTypes(activity).getOtherMapCategory(), tagKeys, valueKeys);
 		tagKeys.addAll(EditPoiDialogFragment.BASIC_TAGS);
-		mAdapter.setTagData(tagKeys.toArray(new String[tagKeys.size()]));
+		mAdapter.setTagData(tagKeys.toArray(new String[0]));
-		mAdapter.setValueData(valueKeys.toArray(new String[valueKeys.size()]));
+		mAdapter.setValueData(valueKeys.toArray(new String[0]));
 		Button addTagButton = (Button) view.findViewById(R.id.addTagButton);
 		addTagButton.setOnClickListener(new View.OnClickListener() {
 			@Override

OsmAnd/src/net/osmand/plus/osmedit/AdvancedEditPoiFragment.java

@@ -89,8 +89,8 @@ public class AdvancedEditPoiFragment extends BaseOsmAndFragment
 			addPoiToStringSet(abstractPoiType, tagKeys, valueKeys);
 		}
 		addPoiToStringSet(mapPoiTypes.getOtherMapCategory(), tagKeys, valueKeys);
-		mAdapter.setTagData(tagKeys.toArray(new String[tagKeys.size()]));
+		mAdapter.setTagData(tagKeys.toArray(new String[0]));
-		mAdapter.setValueData(valueKeys.toArray(new String[valueKeys.size()]));
+		mAdapter.setValueData(valueKeys.toArray(new String[0]));
 		Button addTagButton = (Button) view.findViewById(R.id.addTagButton);
 		addTagButton.setOnClickListener(new View.OnClickListener() {
 			@Override

OsmAnd/src/net/osmand/plus/osmedit/EditPoiDialogFragment.java

@@ -427,8 +427,6 @@ public class EditPoiDialogFragment extends BaseOsmAndDialogFragment {
 			f.setArguments(args);
 			f.show(getChildFragmentManager(), "exceedDialog");
 		} else if (TextUtils.isEmpty(poiTypeEditText.getText())) {
-			HashSet<String> tagsCopy = new HashSet<>();
-			tagsCopy.addAll(editPoiData.getTagValues().keySet());
 			if (Algorithms.isEmpty(editPoiData.getTag(OSMSettings.OSMTagKey.ADDR_HOUSE_NUMBER.getValue()))) {
 				SaveExtraValidationDialogFragment f = new SaveExtraValidationDialogFragment();
 				Bundle args = new Bundle();

OsmAnd/src/net/osmand/plus/osmedit/OsmEditingPlugin.java

@@ -415,7 +415,7 @@ public class OsmEditingPlugin extends OsmandPlugin {
 										public void onClick(DialogInterface dialog, int which) {
 											List<GpxInfo> selectedItems = f.getSelectedItems();
 											sendGPXFiles(activity, f,
-													selectedItems.toArray(new GpxInfo[selectedItems.size()]));
+													selectedItems.toArray(new GpxInfo[0]));
 										}
 									});
 							return true;

OsmAnd/src/net/osmand/plus/osmedit/OsmEditsFragment.java

@@ -296,7 +296,7 @@ public class OsmEditsFragment extends OsmAndListFragment implements ProgressDial
 				item.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
 					@Override
 					public boolean onMenuItemClick(MenuItem item) {
-						uploadItems(osmEditsSelected.toArray(new OsmPoint[osmEditsSelected.size()]));
+						uploadItems(osmEditsSelected.toArray(new OsmPoint[0]));
 						mode.finish();
 						return true;
 					}
@@ -594,7 +594,7 @@ public class OsmEditsFragment extends OsmAndListFragment implements ProgressDial
 			public void onClick(int type) {
 				List<OsmPoint> points = getPointsToExport();
 				new BackupOpenstreetmapPointAsyncTask(type, exportType).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
-						points.toArray(new OsmPoint[points.size()]));
+						points.toArray(new OsmPoint[0]));
 			}
 		};
 	}
@@ -684,9 +684,9 @@ public class OsmEditsFragment extends OsmAndListFragment implements ProgressDial
 			@Override
 			public void uploadEnded(Map<OsmPoint, String> loadErrorsMap) {
 				super.uploadEnded(loadErrorsMap);
-				for (OsmPoint osmPoint : loadErrorsMap.keySet()) {
+				for (Map.Entry<OsmPoint, String> entry : loadErrorsMap.entrySet()) {
-					if (loadErrorsMap.get(osmPoint) == null) {
+					if (entry.getValue() == null) {
-						osmEdits.remove(osmPoint);
+						osmEdits.remove(entry.getKey());
 					}
 				}
 				recreateAdapterData();

OsmAnd/src/net/osmand/plus/osmedit/OsmEditsUploadListenerHelper.java

@@ -59,8 +59,8 @@ public class OsmEditsUploadListenerHelper implements OsmEditsUploadListener {
 		}
 		int uploaded = 0;
 		int pointsNum = loadErrorsMap.keySet().size();
-		for (OsmPoint point : loadErrorsMap.keySet()) {
+		for (String s : loadErrorsMap.values()) {
-			if (loadErrorsMap.get(point) == null) {
+			if (s == null) {
 				uploaded++;
 			}
 		}
@@ -200,13 +200,14 @@ public class OsmEditsUploadListenerHelper implements OsmEditsUploadListener {
 			boolean[] hasErrors = new boolean[loadErrorsMap.keySet().size()];
 			ArrayList<OsmPoint> pointsWithErrors = new ArrayList<>();
 			int i = 0;
-			for (OsmPoint point : loadErrorsMap.keySet()) {
+			for (Map.Entry<OsmPoint, String> entry : loadErrorsMap.entrySet()) {
+				OsmPoint point = entry.getKey();
 				pointNames[i] = point.getGroup() == OsmPoint.Group.BUG ?
 						((OsmNotesPoint) point).getText() :
 						((OpenstreetmapPoint) point).getName();
 				pointNames[i] = TextUtils.isEmpty(pointNames[i]) ?
 						"id:" + point.getId() : pointNames[i];
-				hasErrors[i] = loadErrorsMap.get(point) != null;
+				hasErrors[i] = entry.getValue() != null;
 				if (hasErrors[i]) {
 					pointsWithErrors.add(point);
 				}
@@ -221,7 +222,7 @@ public class OsmEditsUploadListenerHelper implements OsmEditsUploadListener {
 					new UploadingMultipleErrorDialogFragment();
 			Bundle bundle = new Bundle();
 			bundle.putSerializable(POINTS_WITH_ERRORS,
-					pointsWithErrors.toArray(new OsmPoint[pointsWithErrors.size()]));
+					pointsWithErrors.toArray(new OsmPoint[0]));
 			bundle.putStringArray(POINT_NAMES, pointNames);
 			bundle.putBooleanArray(HAS_ERROR, hasErrors);
 			fragment.setArguments(bundle);

OsmAnd/src/net/osmand/plus/osmedit/dialogs/PoiSubTypeDialogFragment.java

@@ -36,7 +36,7 @@ public class PoiSubTypeDialogFragment extends DialogFragment {
 		} else {
 			addCategory(a, strings);
 		}
-		final String[] subCats = strings.toArray(new String[strings.size()]);
+		final String[] subCats = strings.toArray(new String[0]);
 		builder.setItems(subCats, new DialogInterface.OnClickListener() {
 			@Override
 			public void onClick(DialogInterface dialog, int which) {

OsmAnd/src/net/osmand/plus/osmedit/dialogs/PoiTypeDialogFragment.java

@@ -31,7 +31,7 @@ public class PoiTypeDialogFragment extends DialogFragment {
 				categories.add(category);
 			}
 		}
-		builder.setItems(vals.toArray(new String[vals.size()]), new Dialog.OnClickListener() {
+		builder.setItems(vals.toArray(new String[0]), new Dialog.OnClickListener() {
 			@Override
 			public void onClick(DialogInterface dialog, int which) {
 				PoiCategory aType = categories.get(which);

OsmAnd/src/net/osmand/plus/osmedit/dialogs/SendPoiBottomSheetFragment.java

@@ -250,7 +250,7 @@ public class SendPoiBottomSheetFragment extends MenuBottomSheetDialogFragment {
         if (modifiedItemsOutOfLimit != 0) {
             comment = comment.concat("; ").concat(modifiedItemsOutOfLimit + " ")
                     .concat(getString(R.string.items_modified)).concat(".");
-        } else if (!comment.equals("")) {
+        } else if (!comment.isEmpty()) {
             comment = comment.concat(".");
         }
         return comment;

OsmAnd/src/net/osmand/plus/osmedit/dialogs/SendPoiDialogFragment.java

@@ -84,7 +84,7 @@ public class SendPoiDialogFragment extends DialogFragment {
 		messageLabel.setVisibility(hasPOI ? View.VISIBLE : View.GONE);
 		messageEditText.setVisibility(hasPOI ? View.VISIBLE : View.GONE);
 		closeChangeSetCheckBox.setVisibility(hasPOI ? View.VISIBLE : View.GONE);
-		closeChangeSetCheckBox.setChecked(hasPOI && !defaultChangeSet.equals(""));
+		closeChangeSetCheckBox.setChecked(hasPOI && !defaultChangeSet.isEmpty());
 		view.findViewById(R.id.osm_note_header).setVisibility(hasPOI ? View.GONE : View.VISIBLE);
 		uploadAnonymously.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
 			@Override
@@ -233,7 +233,7 @@ public class SendPoiDialogFragment extends DialogFragment {
 		}
 		if (modifiedItemsOutOfLimit != 0) {
 			comment = comment.concat("; ").concat(modifiedItemsOutOfLimit + " ").concat(getString(R.string.items_modified)).concat(".");
-		} else if (!comment.equals("")){
+		} else if (!comment.isEmpty()){
 			comment = comment.concat(".");
 		}
 		return comment;

OsmAnd/src/net/osmand/plus/poi/PoiFiltersHelper.java

@@ -231,9 +231,8 @@ public class PoiFiltersHelper {
 	public List<PoiUIFilter> getTopDefinedPoiFilters(boolean includeDeleted) {
 		List<PoiUIFilter> top = this.cacheTopStandardFilters;
 		if (top == null) {
-			top = new ArrayList<>();
 			// user defined
-			top.addAll(getUserDefinedPoiFilters(true));
+			top = new ArrayList<>(getUserDefinedPoiFilters(true));
 			// default
 			MapPoiTypes poiTypes = application.getPoiTypes();
 			for (AbstractPoiType t : poiTypes.getTopVisibleFilters()) {
@@ -751,14 +750,15 @@ public class PoiFiltersHelper {
 				}
 				Map<PoiCategory, LinkedHashSet<String>> types = p.getAcceptedTypes();
 				SQLiteStatement insertCategories = db.compileStatement("INSERT INTO " + CATEGORIES_NAME + " VALUES (?, ?, ?)");
-				for (PoiCategory a : types.keySet()) {
+				for (Map.Entry<PoiCategory, LinkedHashSet<String>> entry : types.entrySet()) {
-					if (types.get(a) == null) {
+					PoiCategory a = entry.getKey();
+					if (entry.getValue() == null) {
 						insertCategories.bindString(1, p.getFilterId());
 						insertCategories.bindString(2, a.getKeyName());
 						insertCategories.bindNull(3);
 						insertCategories.execute();
 					} else {
-						for (String s : types.get(a)) {
+						for (String s : entry.getValue()) {
 							insertCategories.bindString(1, p.getFilterId());
 							insertCategories.bindString(2, a.getKeyName());
 							insertCategories.bindString(3, s);

OsmAnd/src/net/osmand/plus/poi/PoiUIFilter.java

@@ -535,20 +535,19 @@ public class PoiUIFilter implements SearchPoiTypeFilter, Comparable<PoiUIFilter>
 			return getName();
 		}
 		StringBuilder res = new StringBuilder();
-		for (PoiCategory p : acceptedTypes.keySet()) {
+		for (Entry<PoiCategory, LinkedHashSet<String>> entry : acceptedTypes.entrySet()) {
-			LinkedHashSet<String> set = acceptedTypes.get(p);
+			LinkedHashSet<String> set = entry.getValue();
 			if (set == null) {
 				if (res.length() > 0) {
 					res.append(", ");
 				}
-				res.append(p.getTranslation());
+				res.append(entry.getKey().getTranslation());
 			}
 			if (res.length() > chars) {
 				return res.toString();
 			}
 		}
-		for (PoiCategory p : acceptedTypes.keySet()) {
+		for (LinkedHashSet<String> set : acceptedTypes.values()) {
-			LinkedHashSet<String> set = acceptedTypes.get(p);
 			if (set != null) {
 				for (String st : set) {
 					if (res.length() > 0) {
@@ -616,8 +615,8 @@ public class PoiUIFilter implements SearchPoiTypeFilter, Comparable<PoiUIFilter>
 
 	public boolean areAllTypesAccepted() {
 		if (poiTypes.getCategories(false).size() == acceptedTypes.size()) {
-			for (PoiCategory a : acceptedTypes.keySet()) {
+			for (LinkedHashSet<String> strings : acceptedTypes.values()) {
-				if (acceptedTypes.get(a) != null) {
+				if (strings != null) {
 					return false;
 				}
 			}
@@ -711,8 +710,9 @@ public class PoiUIFilter implements SearchPoiTypeFilter, Comparable<PoiUIFilter>
 	}
 
 	private void putAllAcceptedTypes(Map<PoiCategory, LinkedHashSet<String>> types) {
-		for (PoiCategory category : types.keySet()) {
+		for (Entry<PoiCategory, LinkedHashSet<String>> entry : types.entrySet()) {
-			LinkedHashSet<String> typesSet = types.get(category);
+			PoiCategory category = entry.getKey();
+			LinkedHashSet<String> typesSet = entry.getValue();
 			if (acceptedTypes.containsKey(category)) {
 				if (acceptedTypes.get(category) != null && typesSet != null) {
 					acceptedTypes.get(category).addAll(typesSet);

OsmAnd/src/net/osmand/plus/render/MapRenderRepositories.java

@@ -311,8 +311,9 @@ public class MapRenderRepositories {
 		}
 		boolean containsJapanMapData = false;
 		boolean useLive = context.getSettings().USE_OSM_LIVE_FOR_ROUTING.get();
-		for (String mapName : files.keySet()) {
+		for (Map.Entry<String, BinaryMapIndexReader> entry : files.entrySet()) {
-			BinaryMapIndexReader fr = files.get(mapName);
+			String mapName = entry.getKey();
+			BinaryMapIndexReader fr = entry.getValue();
 			if (fr != null && (fr.containsMapData(leftX, topY, rightX, bottomY, zoom) ||
 					fr.containsRouteData(leftX, topY, rightX, bottomY, zoom))) {
 				if (!nativeFiles.contains(mapName)) {
@@ -727,7 +728,7 @@ public class MapRenderRepositories {
 			currentRenderingContext.height = requestedBox.getPixHeight();
 			currentRenderingContext.nightMode = nightMode;
 			if(requestedBox.getZoom() <= zoomToOverviewLocalNames &&
-					"".equals(prefs.MAP_PREFERRED_LOCALE.get())) {
+					prefs.MAP_PREFERRED_LOCALE.get() != null && prefs.MAP_PREFERRED_LOCALE.get().isEmpty()) {
 				currentRenderingContext.preferredLocale = app.getLanguage();
 				currentRenderingContext.transliterate =
 						!languagesNotTransliterateOnBasemap.contains(app.getLanguage());

OsmAnd/src/net/osmand/plus/render/TextRenderer.java

@@ -438,7 +438,7 @@ public class TextRenderer {
 						String nameTag = isName ? "" : obj.getMapIndex().decodeType(tag).tag;
 						boolean skip = false;
 						// not completely correct we should check "name"+rc.preferredLocale
-						if (isName && !rc.preferredLocale.equals("") && 
+						if (isName && !rc.preferredLocale.isEmpty() &&
 								map.containsKey(obj.getMapIndex().nameEnEncodingType)) {
 							skip = true;
 						} 

OsmAnd/src/net/osmand/plus/resources/ResourceManager.java

@@ -486,7 +486,7 @@ public class ResourceManager {
 				try {
 					progress.startTask(context.getString(R.string.installing_new_resources), -1);
 					AssetManager assetManager = context.getAssets();
-					boolean isFirstInstall = context.getSettings().PREVIOUS_INSTALLED_VERSION.get().equals("");
+					boolean isFirstInstall = context.getSettings().PREVIOUS_INSTALLED_VERSION.get().isEmpty();
 					unpackBundledAssets(assetManager, applicationDataDir, progress, isFirstInstall || forceUpdate);
 					context.getSettings().PREVIOUS_INSTALLED_VERSION.set(fv);
 					copyRegionsBoundaries();
@@ -1100,7 +1100,7 @@ public class ResourceManager {
 				}
 			}
 		}
-		return readers.toArray(new BinaryMapIndexReader[readers.size()]);
+		return readers.toArray(new BinaryMapIndexReader[0]);
 	}
 
 	public BinaryMapIndexReader[] getTransportRoutingMapFiles() {
@@ -1114,7 +1114,7 @@ public class ResourceManager {
 				}
 			}
 		}
-		return readers.toArray(new BinaryMapIndexReader[readers.size()]);
+		return readers.toArray(new BinaryMapIndexReader[0]);
 	}
 
 	public BinaryMapIndexReader[] getQuickSearchFiles() {
@@ -1129,7 +1129,7 @@ public class ResourceManager {
 				}
 			}
 		}
-		return readers.toArray(new BinaryMapIndexReader[readers.size()]);
+		return readers.toArray(new BinaryMapIndexReader[0]);
 	}
 
 	public Map<String, String> getIndexFileNames() {

OsmAnd/src/net/osmand/plus/routepreparationmenu/AddPointBottomSheetDialog.java

@@ -651,7 +651,7 @@ public class AddPointBottomSheetDialog extends MenuBottomSheetDialogFragment {
 									((FavouritePoint) item).getSpecialPointType().getIconId(app), iconColor));
 							favoriteViewHolder.description.setText(point.getDescription());
 						} else {
-							if (point.getCategory().equals("")) {
+							if (point.getCategory().isEmpty()) {
 								favoriteViewHolder.description.setText(R.string.shared_string_favorites);
 							} else {
 								favoriteViewHolder.description.setText(point.getCategory());

OsmAnd/src/net/osmand/plus/routing/RouteProvider.java

@@ -121,7 +121,7 @@ public class RouteProvider {
 					list.add(r);
 				}
 			}
-			return list.toArray(new RouteService[list.size()]);
+			return list.toArray(new RouteService[0]);
 		}
 	}
 

OsmAnd/src/net/osmand/plus/settings/backend/backup/SettingsHelper.java

@@ -55,6 +55,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
+import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -820,7 +821,7 @@ public class SettingsHelper {
 	}
 
 	public static Map<ExportSettingsType, List<?>> getSettingsToOperate(List<SettingsItem> settingsItems, boolean importComplete) {
-		Map<ExportSettingsType, List<?>> settingsToOperate = new HashMap<>();
+		Map<ExportSettingsType, List<?>> settingsToOperate = new EnumMap<>(ExportSettingsType.class);
 		List<ApplicationModeBean> profiles = new ArrayList<>();
 		List<QuickAction> quickActions = new ArrayList<>();
 		List<PoiUIFilter> poiUIFilters = new ArrayList<>();

OsmAnd/src/net/osmand/plus/settings/bottomsheets/BooleanPreferenceBottomSheet.java

@@ -59,9 +59,9 @@ public class BooleanPreferenceBottomSheet extends BasePreferenceBottomSheet {
 		final BooleanPreference pref = (BooleanPreference) preference;
 		CharSequence summaryOn = switchPreference.getSummaryOn();
 		CharSequence summaryOff = switchPreference.getSummaryOff();
-		final String on = summaryOn == null || summaryOn.toString().equals("")
+		final String on = summaryOn == null || summaryOn.toString().isEmpty()
 				? getString(R.string.shared_string_enabled) : summaryOn.toString();
-		final String off = summaryOff == null || summaryOff.toString().equals("")
+		final String off = summaryOff == null || summaryOff.toString().isEmpty()
 				? getString(R.string.shared_string_disabled) : summaryOff.toString();
 		final int activeColor = AndroidUtils.resolveAttribute(themedCtx, R.attr.active_color_basic);
 		final int disabledColor = AndroidUtils.resolveAttribute(themedCtx, android.R.attr.textColorSecondary);

OsmAnd/src/net/osmand/plus/settings/bottomsheets/SelectFolderBottomSheet.java

@@ -158,7 +158,7 @@ public class SelectFolderBottomSheet extends BasePreferenceBottomSheet {
 		Fragment fragment = getTargetFragment();
 		if (fragment instanceof BaseSettingsFragment) {
 			String newPath = editText.getText().toString().trim();
-			if (!newPath.equals("")) {
+			if (!newPath.isEmpty()) {
 				boolean pathChanged = !newPath.equals(currentPath);
 				Bundle bundle = new Bundle();
 				bundle.putBoolean(TAG, true);

OsmAnd/src/net/osmand/plus/settings/fragments/DataStorageFragment.java

@@ -241,7 +241,7 @@ public class DataStorageFragment extends BaseSettingsFragment implements DataSto
 					divider.setVisibility(View.VISIBLE);
 					secondPart.setVisibility(View.VISIBLE);
 					String space = getSpaceDescription(item.getDirectory());
-					if (!space.equals("")) {
+					if (!space.isEmpty()) {
 						space = space.replaceAll(" • ", "  •  ");
 						tvSummary.setText(space);
 						tvSummary.setVisibility(View.VISIBLE);

OsmAnd/src/net/osmand/plus/settings/fragments/ImportSettingsFragment.java

@@ -76,6 +76,7 @@ import org.apache.commons.logging.Log;
 import java.io.File;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -201,7 +202,7 @@ public class ImportSettingsFragment extends BaseOsmAndFragment {
 		}
 
 		adapter = new ExportImportSettingsAdapter(app, nightMode, true);
-		Map<ExportSettingsType, List<?>> itemsMap = new HashMap<>();
+		Map<ExportSettingsType, List<?>> itemsMap = new EnumMap<>(ExportSettingsType.class);
 		if (settingsItems != null) {
 			itemsMap = SettingsHelper.getSettingsToOperate(settingsItems, false);
 			adapter.updateSettingsList(itemsMap);

OsmAnd/src/net/osmand/plus/settings/fragments/ProfileAppearanceFragment.java

@@ -897,7 +897,7 @@ public class ProfileAppearanceFragment extends BaseSettingsFragment {
 	}
 	
 	private boolean nameIsEmpty() {
-		return changedProfile.name.trim().equals("");
+		return changedProfile.name.trim().isEmpty();
 	}
 	
 	private void disableSaveButtonWithErrorMessage(String errorMessage) {

OsmAnd/src/net/osmand/plus/srtmplugin/SRTMPlugin.java

@@ -137,9 +137,9 @@ public class SRTMPlugin extends OsmandPlugin {
 	public boolean init(@NonNull final OsmandApplication app, Activity activity) {
 		OsmandSettings settings = app.getSettings();
 		CommonPreference<String> pref = settings.getCustomRenderProperty("contourLines");
-		if (pref.get().equals("")) {
+		if (pref.get().isEmpty()) {
 			for (ApplicationMode m : ApplicationMode.allPossibleValues()) {
-				if (pref.getModeValue(m).equals("")) {
+				if (pref.getModeValue(m).isEmpty()) {
 					pref.setModeValue(m, "13");
 				}
 			}
@@ -456,7 +456,7 @@ public class SRTMPlugin extends OsmandPlugin {
 
 		List<String> possibleValuesList = new ArrayList<>(Arrays.asList(p.getPossibleValues()));
 		possibleValuesList.remove(CONTOUR_LINES_DISABLED_VALUE);
-		final String[] possibleValues = possibleValuesList.toArray(new String[possibleValuesList.size()]);
+		final String[] possibleValues = possibleValuesList.toArray(new String[0]);
 
 		int i = possibleValuesList.indexOf(pref.get());
 		if (i >= 0) {

OsmAnd/src/net/osmand/plus/srtmplugin/TerrainLayer.java

@@ -114,12 +114,13 @@ public class TerrainLayer extends MapTileLayer {
 			}
 
 			private void indexNonCachedResources(Map<String, Long> fileModified, Map<String, SQLiteTileSource> rs) {
-				for(String filename : fileModified.keySet()) {
+				for(Map.Entry<String, Long> entry : fileModified.entrySet()) {
+					String filename = entry.getKey();
 					try {
 						log.info("Indexing " + type + " file " + filename);
 						ContentValues cv = new ContentValues();
 						cv.put("filename", filename);
-						cv.put("date_modified", fileModified.get(filename));
+						cv.put("date_modified", entry.getValue());
 						SQLiteTileSource ts = rs.get(filename);
 						QuadRect rt = ts.getRectBoundary(ZOOM_BOUNDARY, 1);
 						if (rt != null) {

OsmAnd/src/net/osmand/plus/views/AddGpxPointBottomSheetHelper.java

@@ -86,7 +86,7 @@ public class AddGpxPointBottomSheetHelper implements OnDismissListener {
 	}
 
 	public void setTitle(String title) {
-		if (title.equals("")) {
+		if (title.isEmpty()) {
 			if (pointDescription.isWpt()) {
 				title = mapActivity.getString(R.string.waypoint_one);
 			} else if (pointDescription.isRte()) {

OsmAnd/src/net/osmand/plus/views/layers/AidlMapLayer.java

@@ -181,7 +181,7 @@ public class AidlMapLayer extends OsmandMapLayer implements IContextMenuProvider
 			}
 
 			if (imageRequests.size() > 0) {
-				executeTaskInBackground(new PointImageReaderTask(this), imageRequests.toArray(new String[imageRequests.size()]));
+				executeTaskInBackground(new PointImageReaderTask(this), imageRequests.toArray(new String[0]));
 			}
 		}
 		mapTextLayer.putData(this, displayedPoints);

OsmAnd/src/net/osmand/plus/views/layers/ContextMenuLayer.java

@@ -232,20 +232,22 @@ public class ContextMenuLayer extends OsmandMapLayer {
 		if (!pressedLatLonSmall.isEmpty() || !pressedLatLonFull.isEmpty()) {
 			textScale = activity.getMyApplication().getSettings().TEXT_SCALE.get();
 		}
-		for (LatLon latLon : pressedLatLonSmall.keySet()) {
+		for (Entry<LatLon, BackgroundType> entry : pressedLatLonSmall.entrySet()) {
+			LatLon latLon = entry.getKey();
 			int x = (int) box.getPixXFromLatLon(latLon.getLatitude(), latLon.getLongitude());
 			int y = (int) box.getPixYFromLatLon(latLon.getLatitude(), latLon.getLongitude());
-			BackgroundType background = pressedLatLonSmall.get(latLon);
+			BackgroundType background = entry.getValue();
 			Bitmap pressedBitmapSmall = background.getTouchBackground(activity, true);
 			Rect destRect = getIconDestinationRect(
 					x, y, pressedBitmapSmall.getWidth(), pressedBitmapSmall.getHeight(), textScale);
 			canvas.drawBitmap(pressedBitmapSmall, null, destRect, paint);
 		}
-		for (LatLon latLon : pressedLatLonFull.keySet()) {
+		for (Entry<LatLon, BackgroundType> entry : pressedLatLonFull.entrySet()) {
+			LatLon latLon = entry.getKey();
 			int x = (int) box.getPixXFromLatLon(latLon.getLatitude(), latLon.getLongitude());
 			int y = (int) box.getPixYFromLatLon(latLon.getLatitude(), latLon.getLongitude());
 
-			BackgroundType background = pressedLatLonFull.get(latLon);
+			BackgroundType background = entry.getValue();
 			Bitmap pressedBitmap = background.getTouchBackground(activity, false);
 			int offsetY = background.getOffsetY(activity, textScale);
 			Rect destRect = getIconDestinationRect(

OsmAnd/src/net/osmand/plus/views/layers/MapControlsLayer.java

@@ -1387,7 +1387,7 @@ public class MapControlsLayer extends OsmandMapLayer {
 				}
 
 				bld.setTitle(R.string.map_magnifier);
-				bld.setSingleChoiceItems(values.toArray(new String[values.size()]), i,
+				bld.setSingleChoiceItems(values.toArray(new String[0]), i,
 						new DialogInterface.OnClickListener() {
 							@Override
 							public void onClick(DialogInterface dialog, int which) {

OsmAnd/src/net/osmand/plus/views/layers/MapTextLayer.java

@@ -61,7 +61,8 @@ public class MapTextLayer extends OsmandMapLayer {
 	@Override
 	public void onPrepareBufferImage(Canvas canvas, RotatedTileBox tileBox, DrawSettings settings) {
 		TIntHashSet set = new TIntHashSet();
-		for (OsmandMapLayer l : textObjects.keySet()) {
+		for (Map.Entry<OsmandMapLayer, Collection<?>> entry : textObjects.entrySet()) {
+			OsmandMapLayer l = entry.getKey();
 			MapTextProvider provider = (MapTextProvider) l;
 			if (!view.isLayerVisible(l) || !provider.isTextVisible()) {
 				continue;
@@ -69,7 +70,7 @@ public class MapTextLayer extends OsmandMapLayer {
 
 			updateTextSize();
 			paintTextIcon.setFakeBoldText(provider.isFakeBoldText());
-			for (Object o : textObjects.get(l)) {
+			for (Object o : entry.getValue()) {
 				LatLon loc = provider.getTextLocation(o);
 				String name = provider.getText(o);
 				if (loc == null || TextUtils.isEmpty(name)) {

OsmAnd/src/net/osmand/plus/voice/AbstractPrologCommandPlayer.java

@@ -222,7 +222,7 @@ public abstract class AbstractPrologCommandPlayer implements CommandPlayer, Stat
 
 	@Override
 	public List<String> execute(List<Struct> listCmd){
-		Struct list = new Struct(listCmd.toArray(new Term[listCmd.size()]));
+		Struct list = new Struct(listCmd.toArray(new Term[0]));
 		Var result = new Var("RESULT"); //$NON-NLS-1$
 		List<String> files = new ArrayList<String>();
 		if(prologSystem == null) {

OsmAnd/src/net/osmand/plus/wikivoyage/data/TravelDbHelper.java

@@ -216,7 +216,7 @@ public class TravelDbHelper {
 			}
 			query += ") ";
 			if (params.size() > 0) {
-				SQLiteCursor cursor = conn.rawQuery(query, params.toArray(new String[params.size()]));
+				SQLiteCursor cursor = conn.rawQuery(query, params.toArray(new String[0]));
 				if (cursor != null) {
 					if (cursor.moveToFirst()) {
 						do {
@@ -468,7 +468,7 @@ public class TravelDbHelper {
 					params.add(lang);
 				}
 			}
-			SQLiteCursor cursor = conn.rawQuery(query.toString(), params.toArray(new String[params.size()]));
+			SQLiteCursor cursor = conn.rawQuery(query.toString(), params.toArray(new String[0]));
 			if (cursor != null && cursor.moveToFirst()) {
 				do {
 					WikivoyageSearchResult rs = new WikivoyageSearchResult();

OsmAnd/src/net/osmand/plus/wikivoyage/explore/ExploreTabFragment.java

@@ -341,7 +341,7 @@ public class ExploreTabFragment extends BaseOsmAndFragment implements DownloadEv
 				res.add(item);
 			}
 		}
-		return res.toArray(new IndexItem[res.size()]);
+		return res.toArray(new IndexItem[0]);
 	}
 
 	@NonNull

OsmAndCore-sample/src/net/osmand/core/samples/android/sample1/CurrentPositionHelper.java

@@ -128,7 +128,7 @@ public class CurrentPositionHelper {
 	}
 
 	private void initCtx(SampleApplication app, List<BinaryMapIndexReader> checkReaders) {
-		BinaryMapIndexReader[] rs = checkReaders.toArray(new BinaryMapIndexReader[checkReaders.size()]);
+		BinaryMapIndexReader[] rs = checkReaders.toArray(new BinaryMapIndexReader[0]);
 		if (rs.length > 0) {
 			RoutingConfiguration defCfg = RoutingConfiguration.getDefault().build("geocoding", 10,
 					new HashMap<String, String>());

OsmAndCore-sample/src/net/osmand/core/samples/android/sample1/SampleFormatter.java

@@ -23,7 +23,7 @@ public class SampleFormatter {
 	public final static float FEET_IN_ONE_METER = YARDS_IN_ONE_METER * 3f;
 	private static final DecimalFormat fixed2 = new DecimalFormat("0.00");
 	private static final DecimalFormat fixed1 = new DecimalFormat("0.0");
-	{
+	static {
 		fixed2.setMinimumFractionDigits(2);
 		fixed1.setMinimumFractionDigits(1);
 		fixed1.setMinimumIntegerDigits(1);