[Android] Add default Proguard config

local-cli/generator-android/templates/src/app/build.gradle

@@ -16,7 +16,7 @@ android {
     }
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled false  // Set this to true to enable Proguard
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }

local-cli/generator-android/templates/src/app/proguard-rules.pro

@@ -15,3 +15,46 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+
+# Disabling obfuscation is useful if you collect stack traces from production crashes
+# (unless you are using a system that supports de-obfuscate the stack traces).
+-dontobfuscate
+
+# React Native
+
+# Keep our interfaces so they can be used by other ProGuard rules.
+# See http://sourceforge.net/p/proguard/bugs/466/
+-keep,allowobfuscation @interface com.facebook.proguard.annotations.DoNotStrip
+-keep,allowobfuscation @interface com.facebook.proguard.annotations.KeepGettersAndSetters
+
+# Do not strip any method/class that is annotated with @DoNotStrip
+-keep @com.facebook.proguard.annotations.DoNotStrip class *
+-keepclassmembers class * {
+    @com.facebook.proguard.annotations.DoNotStrip *;
+}
+
+-keepclassmembers @com.facebook.proguard.annotations.KeepGettersAndSetters class * {
+  void set*(***);
+  *** get*();
+}
+
+-keep class * extends com.facebook.react.bridge.JavaScriptModule { *; }
+-keep class * extends com.facebook.react.bridge.NativeModule { *; }
+-keepclassmembers class *  { @com.facebook.react.uimanager.UIProp <fields>; }
+-keepclassmembers class *  { @com.facebook.react.uimanager.ReactProp <methods>; }
+-keepclassmembers class *  { @com.facebook.react.uimanager.ReactPropGroup <methods>; }
+
+# okhttp
+
+-keepattributes Signature
+-keepattributes *Annotation*
+-keep class com.squareup.okhttp.** { *; }
+-keep interface com.squareup.okhttp.** { *; }
+-dontwarn com.squareup.okhttp.**
+
+# okio
+
+-keep class sun.misc.Unsafe { *; }
+-dontwarn java.nio.file.*
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+-dontwarn okio.**