shrinkResources true

app/build.gradle

@@ -24,7 +24,8 @@ android {
     buildTypes {
         release {
             signingConfig signingConfigs.release
-            minifyEnabled false
+            minifyEnabled true
+            shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }