React-native: Error when assembling Android release with proguard

[lyahdav]

Description

After creating a new React Native project, enabling proguard per these instructions, and building a release Android build I get the following error:

Note: there were 2 references to unknown classes.
      You should check your configuration for typos.
      (http://proguard.sourceforge.net/manual/troubleshooting.html#unknownclass)
Note: there were 654 unkept descriptor classes in kept class members.
      You should consider explicitly keeping the mentioned classes
      (using '-keep').
      (http://proguard.sourceforge.net/manual/troubleshooting.html#descriptorclass)
Note: there were 7 unresolved dynamic references to classes or interfaces.
      You should check if you need to specify additional program jars.
      (http://proguard.sourceforge.net/manual/troubleshooting.html#dynamicalclass)
Warning: there were 1 unresolved references to library class members.
         You probably need to update the library versions.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedlibraryclassmember)
Warning: Exception while processing task java.io.IOException: Please correct the above warnings first.
:app:transformClassesAndResourcesWithProguardForRelease FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> Job failed, see logs for details

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

The specific warning in the output is:

Warning: com.facebook.fbui.textlayoutbuilder.proxy.StaticLayoutProxy: can't find referenced method 'StaticLayout(java.lang.CharSequence,int,int,android.text.TextPaint,int,android.text.Layout$Alignment,android.text.TextDirectionHeuristic,float,float,boolean,android.text.TextUtils$TruncateAt,int,int)' in library class android.text.StaticLayout

Reproduction

1. react-native init --version="0.42.0" myapp
2. cd myapp/android
3. sed -i -e 's/enableProguardInReleaseBuilds = false/enableProguardInReleaseBuilds = true/g' app/build.gradle
4. ./gradlew --offline assembleRelease
5. Notice the error above

Solution

Don't know

Additional Information

• React Native version: 0.42.0
• Platform: Android
• Development Operating System: Mac OS X 10.11.6
• Dev tools: I have Android API levels 23-25 installed

[lyahdav]

Pretty sure this is duplicate of https://github.com/facebook/react-native/issues/11891.

[jxr202]

我有一个一样的问题，按 #11891的方法还是没解决，你的解决了么？

[aolphn]

@jxr202 你猜他能看懂不

[d-rahul]

This issue is coming due to pro-guard enable in the release config of the app. So the solution is either remove pro-guard or put the indicated code snippet as in the link https://readyandroid.wordpress.com/errorexecution-failed-for-task-apptransformclassesandresourceswithproguardforrelease/

[Timmy-zzh]

@jxr202 我也遇到这个问题了，请问你解决了吗？