在Android上首次使用ClassNotFoundException打开Flutter应用程序时崩溃

Question

My flutter app is crashing when opening first time after installing from play store. After that it is working fine. Below is the crash report

java.lang.NoClassDefFoundError: 
  at com.google.android.gms.internal.zzccn.<init> (Unknown Source:3)
  at com.google.android.gms.measurement.AppMeasurementInstallReferrerReceiver.onReceive (Unknown Source:6)
  at android.app.ActivityThread.handleReceiver (ActivityThread.java:3273)
  at android.app.ActivityThread.-wrap17 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1690)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6592)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:240)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:769)
Caused by: java.lang.ClassNotFoundException: 
  at dalvik.system.BaseDexClassLoader.findClass (BaseDexClassLoader.java:93)
  at java.lang.ClassLoader.loadClass (ClassLoader.java:379)
  at java.lang.ClassLoader.loadClass (ClassLoader.java:312)

Is this related to FCM messaging? The error is saying ClassNotFound but, if it is because of missing java class, then how it is working from second time onwards?

Answer 1

请注意，如果MainActivity类的包与AndroidManifest.xml中的属性包匹配，请再次检查android / src / main / java。

Answer 2

I also had this problem, just update com.google.gms: google-services: 3.2.1 to com.google.gms: google-services: 4.2.0 there in "Android\\App\\build.grandle" that goes the problem.

For more information: Problem reported in github