Add the ability to clear wikivoyage images cache

OsmAnd/src/net/osmand/PicassoUtils.java

@@ -0,0 +1,91 @@
+package net.osmand;
+
+import android.content.Context;
+import android.os.StatFs;
+import android.support.annotation.NonNull;
+
+import com.squareup.picasso.LruCache;
+import com.squareup.picasso.OkHttp3Downloader;
+import com.squareup.picasso.Picasso;
+
+import java.io.File;
+import java.io.IOException;
+
+import okhttp3.Cache;
+import okhttp3.OkHttpClient;
+
+import static android.os.Build.VERSION.SDK_INT;
+import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR2;
+
+public class PicassoUtils {
+
+	private static final String PICASSO_CACHE = "picasso-cache";
+	private static final int MIN_DISK_CACHE_SIZE = 5 * 1024 * 1024; // 5MB
+	private static final int MAX_DISK_CACHE_SIZE = 50 * 1024 * 1024; // 50MB
+
+	private static Cache diskCache;
+	private static LruCache memoryCache;
+
+	private static boolean initialized;
+
+	public static void setupPicasso(@NonNull Context context) {
+		if (!initialized) {
+			File cacheDir = createDefaultCacheDir(context);
+
+			diskCache = new Cache(cacheDir, calculateDiskCacheSize(cacheDir));
+			memoryCache = new LruCache(context);
+
+			Picasso picasso = new Picasso.Builder(context)
+					.downloader(new OkHttp3Downloader(new OkHttpClient.Builder().cache(diskCache).build()))
+					.memoryCache(memoryCache)
+					.build();
+
+			Picasso.setSingletonInstance(picasso);
+
+			initialized = true;
+		}
+	}
+
+	public static void clearAllPicassoCache() {
+		if (memoryCache != null) {
+			memoryCache.clear();
+		}
+		if (diskCache != null) {
+			try {
+				diskCache.evictAll();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	private static File createDefaultCacheDir(Context context) {
+		File cache = new File(context.getApplicationContext().getCacheDir(), PICASSO_CACHE);
+		if (!cache.exists()) {
+			//noinspection ResultOfMethodCallIgnored
+			cache.mkdirs();
+		}
+		return cache;
+	}
+
+	private static long calculateDiskCacheSize(File dir) {
+		long size = MIN_DISK_CACHE_SIZE;
+
+		try {
+			StatFs statFs = new StatFs(dir.getAbsolutePath());
+			//noinspection deprecation
+			long blockCount =
+					SDK_INT < JELLY_BEAN_MR2 ? (long) statFs.getBlockCount() : statFs.getBlockCountLong();
+			//noinspection deprecation
+			long blockSize =
+					SDK_INT < JELLY_BEAN_MR2 ? (long) statFs.getBlockSize() : statFs.getBlockSizeLong();
+			long available = blockCount * blockSize;
+			// Target 2% of the total space.
+			size = available / 50;
+		} catch (IllegalArgumentException ignored) {
+		}
+
+		// Bound inside min/max size for disk cache.
+		return Math.max(Math.min(size, MAX_DISK_CACHE_SIZE), MIN_DISK_CACHE_SIZE);
+	}
+}

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

@@ -1,5 +1,6 @@
 package net.osmand.plus.wikivoyage.explore;
 
+import android.content.Context;
 import android.content.res.ColorStateList;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
@@ -18,6 +19,7 @@ import android.widget.ImageView;
 import android.widget.TextView;
 
 import net.osmand.AndroidUtils;
+import net.osmand.PicassoUtils;
 import net.osmand.plus.LockableViewPager;
 import net.osmand.plus.R;
 import net.osmand.plus.wikivoyage.WikivoyageBaseDialogFragment;
@@ -34,6 +36,15 @@ public class WikivoyageExploreDialogFragment extends WikivoyageBaseDialogFragmen
 	private static final int EXPLORE_POSITION = 0;
 	private static final int SAVED_ARTICLES_POSITION = 1;
 
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		Context context = getContext();
+		if (context != null) {
+			PicassoUtils.setupPicasso(context);
+		}
+	}
+
 	@Nullable
 	@Override
 	public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

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

@@ -2,8 +2,9 @@ package net.osmand.plus.wikivoyage.explore;
 
 import android.os.Bundle;
 import android.view.View;
-import android.widget.Toast;
+import android.webkit.WebView;
 
+import net.osmand.PicassoUtils;
 import net.osmand.plus.OsmandApplication;
 import net.osmand.plus.OsmandSettings;
 import net.osmand.plus.R;
@@ -49,8 +50,9 @@ public class WikivoyageOptionsBottomSheetDialogFragment extends MenuBottomSheetD
 				.setOnClickListener(new View.OnClickListener() {
 					@Override
 					public void onClick(View v) {
-						// TODO : implement clearing of cache
-						Toast.makeText(getContext(), "Currently in development", Toast.LENGTH_SHORT).show();
+						new WebView(getContext()).clearCache(true);
+						PicassoUtils.clearAllPicassoCache();
+						dismiss();
 					}
 				})
 				.create();