Enable minification for release builds

.gitignore

@@ -8,3 +8,5 @@
 .externalNativeBuild
 .cxx
 local.properties
+app/release
+

app/build.gradle

@@ -91,7 +91,8 @@ android {
             manifestPlaceholders = [providerAuthority: providerAuthority]
             buildConfigField("String", "PROVIDER_AUTHORITY", "\"${providerAuthority}\"")
 
-            minifyEnabled false
+            minifyEnabled true
+            shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }

app/proguard-rules.pro

@@ -1,21 +1,3 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
+-keepattributes LineNumberTable,SourceFile
+-renamesourcefileattribute SourceFile
+-dontobfuscate