Can't Generate Signed APK From Android Studio "Execution Failed For Task ':packageRelease'"

I am using Android Studio 1.2.2 and tried to generate APK with proguard setting. But I can't do it and got below error message. 'Execution failed for task ':packageRelease'. Unab

Solution 1:

Just add to the project's proguard-rules:

-keep public class com.google.android.gms.**
-dontwarn com.google.android.gms.**

Solution 2:

It worked after setting followings in 'proguard-project.txt'. Obviously the gradle should be set for this file.

-dontwarn android.support.v7.**
-keep class android.support.v7.** { *; }
-keep interface android.support.v7.** { *; }

Solution 3:

Look at your build output. You might have proguard warnings in there, like if you have 2 libraries that share some class (with potentialy different versions).

This might prevent proguard to compute an hash.

I had the same issue while having both openIAB and opfIAB (both use Amazon and google IAB) in my build. Removing one of these libs resolved my issue

Solution 4:

OK! its very easy ! just following step by step: build.gradle :minifyEnabled false -> minifyEnabled true proguard-rules.pro : you have to add third libraries that you use in your project like piccaso and etc. if you do this in android studio , it decline this files.

-dontwarn android.support.**
-dontwarn com.github.**
-dontwarn com.squareup.picasso.**
-dontwarn com.etsy.android.grid.**

it works :)

Solution 5:

I had the problem too and the best way to solve it is: Go to the gradle console and see where there is a warning e.g

Warning: com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient

Now open the proguard rules file and scroll to the bottom and add the line

-dontwarn com.squareup.okhttp.**

For any missing classes that you find on the gradle console you basically add the line

-dontwarn followed by class name 

Hope this works for everyone too. Good luck!