App crashes (Databinding Error) after AndroidX Migration

Question

I am trying to migrate a 3 yrs old project to AndroidX. The project have 3 modules.

app
sdk
apis

app is the main module. The project builds AAR file of sdk and apis module on runtime. And the app uses sdk and apis

The changes I did in order to migrate are :

updated target version of app.gradle and gradlewrapper properties
migrated to AndroidX
updated all dependecies of all modules.

As the app starts, it launches an activity from app module which works fine. Just after that it launches an Activity from sdk module. But here the app crashes at DataBindingUtil.setContentView. Databinding is enabled for all 3 modules. Below is the stacktrace.

java.lang.NoClassDefFoundError: Failed resolution of: Lcom/android/databinding/library/baseAdapters/DataBinderMapperImpl;
    at com.xyz.sdk.DataBinderMapperImpl.collectDependencies(DataBinderMapperImpl.java:274)
    at androidx.databinding.MergedDataBinderMapper.addMapper(MergedDataBinderMapper.java:58)
    at androidx.databinding.MergedDataBinderMapper.addMapper(MergedDataBinderMapper.java:60)
    at androidx.databinding.DataBinderMapperImpl.<init>(DataBinderMapperImpl.java:5)
    at androidx.databinding.DataBindingUtil.<clinit>(DataBindingUtil.java:32)
    at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284)
    at com.xyz.sdk.landing.LandingPageActivity.onCreate(LandingPageActivity.java:51)
    at android.app.Activity.performCreate(Activity.java:7136)
    at android.app.Activity.performCreate(Activity.java:7127)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.databinding.library.baseAdapters.DataBinderMapperImpl" on path: DexPathList[[zip file "/data/app/com.example.admin.myapplication-fYwVmwZfRLEOIXuh0dvhUg==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.admin.myapplication-fYwVmwZfRLEOIXuh0dvhUg==/lib/x86, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at com.xyz.sdk.DataBinderMapperImpl.collectDependencies(DataBinderMapperImpl.java:274) 
    at androidx.databinding.MergedDataBinderMapper.addMapper(MergedDataBinderMapper.java:58) 
    at androidx.databinding.MergedDataBinderMapper.addMapper(MergedDataBinderMapper.java:60) 
    at androidx.databinding.DataBinderMapperImpl.<init>(DataBinderMapperImpl.java:5) 
    at androidx.databinding.DataBindingUtil.<clinit>(DataBindingUtil.java:32) 
    at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284) 
    at com.xyz.sdk.landing.LandingPageActivity.onCreate(LandingPageActivity.java:51) 
    at android.app.Activity.performCreate(Activity.java:7136) 
    at android.app.Activity.performCreate(Activity.java:7127) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:6669) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

https://stackoverflow.com/q/40882253/6891563 does this help you? — Khemraj Sharma, Aug 17 '20 at 04:24

score 17 · Answer 1 · answered Sep 10 '20 at 07:33

I had the same error. If you are working in a multi-module project, you need to enable databinding for the app modules that depend on libraries that use it.

So, my fix was to add this to the module using directly databinding and to my app module too.

buildFeatures {
    dataBinding true
}

score 0 · Answer 2 · answered Sep 28 '20 at 11:08

0

In addition to the existing answers. I have to add below lines in proguard.

-keep class androidx.databinding.** { *; }
-keep class * extends androidx.databinding.DataBinderMapper { *; }

answered Sep 28 '20 at 11:08

Shahbaz Hashmi

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App crashes (Databinding Error) after AndroidX Migration

2 Answers2