can't generate signed APK from Android studio “Execution failed for task ':packageRelease'”

问题:

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'.

Unable to compute hash of /Users/Documents/projectX/app/build/intermediates/classes-proguard/release/classes.jar "

The proguard setting is just simple.

-dontshrink -dontoptimize -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -dontpreverify -verbose 

And the gradle file is below.

apply plugin: 'com.android.application' apply plugin: 'com.google.gms.google-services'  android {     compileSdkVersion "Google Inc.:Google APIs:22"     buildToolsVersion "21.1.2"      defaultConfig {         applicationId "com.bientus.cirque.sansotong"         minSdkVersion 15         targetSdkVersion 22         versionCode 1         versionName "1.0" //        multiDexEnabled true     }     buildTypes {         debug {             debuggable true         }          release {             minifyEnabled true             //proguardFiles 'proguard-project.txt', 'proguard.cfg'             //proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt', 'proguard.cfg'             proguardFiles 'proguard-project.txt'         }     } }  dependencies {         compile fileTree(dir: 'libs', include: ['*.jar'])         compile 'com.android.support:appcompat-v7:22.0.0'         compile "com.google.android.gms:play-services:7.5.0" //    compile 'com.android.support:multidex:1.0.0' }  buildscript {     repositories { //        mavenCentral()         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:1.2.3'         classpath 'com.google.gms:google-services:1.3.0-beta1'     } } 

Can anybody give any idea or thought? Thank you very much!

回答1:

Just add to the project's proguard-rules:

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

回答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.** { *; } 

回答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

回答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 :)

回答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!

文章来源: can't generate signed APK from Android studio “Execution failed for task ':packageRelease'”