how to use proguard in Application android studio with Third-Party Libraries

Configering proguard to gradle

ProGuard is a tool to help minify, obfuscate, and optimize your code. It is not only especially useful for reducing the overall size of your Android application as well as removing unused classes and methods that contribute towards the intrinsic 64k method limit of Android applications. Because of the latter issue, ProGuard is often recommended to be used both in development and production especially for larger applications.

ProGuard can be enabled by using the minifyEnabled option for any build type. If you intend to use it for production, it is highly recommended you also enable it on your development. Without fulling testing ProGuard on your development builds, you may encounter unexpected crashes or situations where the app does not function as expected.buildTypes {

  debug {
    minifyEnabled true  // shrink
    useProguard false   // don't obfuscate

    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  }

  release {
    minifyEnabled true  // shrink
    useProguard true    // obfuscate

    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  }
}

Third-Party Libraries

ButterKnife

Note: The following ProGuard lines apply to ButterKnife v7.0. If you are using an older version of ButterKnife, the Proguard rules may be slightly different.

-keep class butterknife.** { *; }
-dontwarn butterknife.internal.**
-keep class **$$ViewBinder { *; }

-keepclasseswithmembernames class * {
    @butterknife.* <fields>;
}

-keepclasseswithmembernames class * {
    @butterknife.* <methods>;
}

Retrofit

-dontwarn retrofit.**
-keep class retrofit.** { *; }
-keepattributes Signature
-keepattributes Exceptions

OkHttp3

-keepattributes Signature
-keepattributes *Annotation*
-keep class okhttp3.** { *; }
-keep interface okhttp3.** { *; }
-dontwarn okhttp3.**
-dontnote okhttp3.**

# Okio
-keep class sun.misc.Unsafe { *; }
-dontwarn java.nio.file.*
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

Gson

-keep class sun.misc.Unsafe { *; }
-keep class com.google.gson.stream.** { *; }

Parcels

keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

-keep class org.parceler.Parceler$$Parcels

Retrolambda

-dontwarn java.lang.invoke.*

References

• https://github.com/krschultz/android-proguard-snippets/tree/master/libraries/
• http://developer.android.com/tools/help/proguard.html