Try to use proguard

OsmAnd/build.gradle

@@ -141,9 +141,13 @@ android {
 
 	buildTypes {
 		debug {
+		    minifyEnabled true
+		    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
 			signingConfig signingConfigs.development
 		}
 		release {
+		    minifyEnabled true
+		    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
 			signingConfig signingConfigs.publishing
 		}
 	}

OsmAnd/proguard-project.txt

@@ -18,3 +18,7 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+# Allow obfuscation of android.support.v7.internal.view.menu.**
+# to avoid problem on Samsung 4.2.2 devices with appcompat v21
+# see https://code.google.com/p/android/issues/detail?id=78377
+-keep class !android.support.v7.internal.view.menu.**,android.support.** {*;}

OsmAnd/proguard.cfg

@@ -1,40 +0,0 @@
--optimizationpasses 5
--dontusemixedcaseclassnames
--dontskipnonpubliclibraryclasses
--dontpreverify
--verbose
--optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-
--keep public class * extends android.app.Activity
--keep public class * extends android.app.Application
--keep public class * extends android.app.Service
--keep public class * extends android.content.BroadcastReceiver
--keep public class * extends android.content.ContentProvider
--keep public class * extends android.app.backup.BackupAgentHelper
--keep public class * extends android.preference.Preference
--keep public class com.android.vending.licensing.ILicensingService
-
--keepclasseswithmembernames class * {
-    native <methods>;
-}
-
--keepclasseswithmembers class * {
-    public <init>(android.content.Context, android.util.AttributeSet);
-}
-
--keepclasseswithmembers class * {
-    public <init>(android.content.Context, android.util.AttributeSet, int);
-}
-
--keepclassmembers class * extends android.app.Activity {
-   public void *(android.view.View);
-}
-
--keepclassmembers enum * {
-    public static **[] values();
-    public static ** valueOf(java.lang.String);
-}
-
--keep class * implements android.os.Parcelable {
-  public static final android.os.Parcelable$Creator *;
-}