Workaround for issue with some samsung devices

build.gradle

@@ -42,7 +42,9 @@ android {
 
     buildTypes {
         release {
-            signingConfig signingConfigs.release
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard.txt'
+                    signingConfig signingConfigs.release
         }
     }
 

proguard.txt

@@ -0,0 +1,9 @@
+-dontshrink
+
+# appcompat-v21 not compatible with some samsung 4.2.2 roms
+# https://code.google.com/p/android/issues/detail?id=78377
+-keep class !android.support.v7.internal.view.menu.**,** {*;}
+
+-keepattributes **
+
+-dontwarn **