Android Studio Signed APK ':app:transformClassesAndResourcesWithProguardForRelease'

Question

When I try to generate signed in Android Studio, I've got the following error :

Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'. java.io.IOException: Please correct the above warnings first.

Already make some research and find that for example :

Error:Execution failed for task ':android:transformClassesAndResourcesWithProguardForRelease'

I followed the advice, it didn't works. So, I tried to update my buildToolsVersion to 23.0.2.

Didn't work too.

It's works only when I modify minifyEnabled to false, and I don't want to.

Can you give me a track please ?

You're probably being asked to build with --debug or something to get more info. What does that reveal? — Doug Stevenson, Mar 14 '16 at 19:40

score 12 · Accepted Answer · answered Mar 14 '16 at 19:11

12

Try performing a clean build (Build > Clean Project) and buliding again.

If that doesn't work, it's likely Proguard is removing some important classes and/or libraries in your app. Take a look at the warnings generated above the error message in the log. You'll need to add rules to your proguard-rules.pro file to keep the necessary classes. Here is an example of the rules required to keep the Butterknife library.

answered Mar 14 '16 at 19:11

Colin White

1,041
11
22

3

Fault to JodaTime. Just had this : `-dontwarn org.joda.time.**` to my proguard-rules.pro file, it's works. Thank you really really much Colin, drinks on me ;-) – fabienbranchel Mar 14 '16 at 19:55

score 1 · Answer 2 · answered Jan 05 '19 at 08:22

1

I had this error, and I don't know why it happened.

I have tried lot of solutions without success.

Except adding these lines to my ProGuard file (proguard-rules.pro) :

-ignorewarnings

-keep class * {
    public private *;
}

Then Clean and Rebuilt, then generate release apk.

Thanks to Rahul...

answered Jan 05 '19 at 08:22

Christian

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7
23

Thanks - after frigging around with 'version' compatibility around gradle this was actually the fix for me. – Harv Jan 11 '19 at 11:31
Note that this directive will prevent proguard from removing any unused classes, which may greatly increase the size of your app. You may want to consider using a more targeted directive (for example, only keeping the package that is causing the original error). – Nic Dahlquist Apr 28 '19 at 04:47

score 0 · Answer 3 · answered Jul 23 '18 at 05:23

0

Add this line in proguard-rules.pro

-keepattributes EnclosingMethod

answered Jul 23 '18 at 05:23

Muhammad Usman Ghani

1,279
13
19

score 0 · Answer 4 · answered Sep 14 '19 at 22:10

0

Update your Gradle plugin and it will work.

answered Sep 14 '19 at 22:10

Nouman Ghaffar

3,780
1
29
37

Android Studio Signed APK ':app:transformClassesAndResourcesWithProguardForRelease'

4 Answers4

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