How to enable ProGuard obfuscation in Android Studio?

Question

I have to protect my app by enabling Proguard obfuscation in Android Studio. I have searched for the process of how to apply it but i did not get any clear solution. When i try it, i always get an error. So can anyone tell me the clear steps to apply it in my app?

I am doing this by the following steps:

1. In Android Studio, open up an Android project.

2. Change to Project View.

3. Change the following line:

   minifyEnable false to minifyEnable true

4. Set ProGuard Rules(optional)

   4.1 In Project View, select the proguard-rules.pro file.

   4.2 Add in the following lines to tell ProGuard not to obfuscate certain classes.

   -keepclassmembers class com.dom925.xxxx  {   public * } 

Error that I am getting by following the steps are

Error:Execution failed for task ':app:packageRelease'. Unable to compute hash of D:\Android\Pojectname\app\build\intermediates\classes-proguard\release\classes.jar

Answer 1

To enable ProGuard in Android Studio.

Below is the sample how to enable default ProGuard in Android Studio.

1. Go to the build.gradle file of app
2. enable the minifyEnabled true
3. enable shrinkResources true to reduce the APK size

4. proguardFiles getDefaultProguardFile('proguard-android.txt') to enable the default one. If you want to use your own proguard file then use the below rules.

   buildTypes {     release {         debuggable false         minifyEnabled true         shrinkResources true         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'     }      debug {         debuggable true         minifyEnabled true         shrinkResources true         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'     } } 

The link with ProGuard settings for Android and other settings are available in these links:

• Default ProGuard file
• Gist with example

For more detail go through this link

Answer 2

I figured out the problem:

Open up the proguard-rules.pro for your project and add this to the bottom:

-dontwarn java.nio.file.Files -dontwarn java.nio.file.Path -dontwarn java.nio.file.OpenOption -dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement 

Basically how I solved it was this I tried to run my app in 'release' mode and got a bunch of errors similar to this guy here: https://github.com/square/okio/issues/144

I pretty much followed what he said and fixed it.

Hope this can help others with generating their APK's!

visit more detail here :

Error:Execution failed for task ':app:packageRelease'. > Unable to compute hash of /../AndroidStudioProjects/../classes.jar