首次启动时无法创建处理程序应用程序崩溃

Question

使用webview应用程序模板一切都很好，但是只是应用程序在第一次启动时一直崩溃，如果有人可以帮助我，我将无法通过java错误创建处理程序

 FATAL EXCEPTION: pool-4-thread-1 Process: com.brommko.android.tasweqo, PID: 9676 java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:200) at android.os.Handler.<init>(Handler.java:114) at android.widget.Toast$TN.<init>(Toast.java:345) at android.widget.Toast.<init>(Toast.java:101) at android.widget.Toast.makeText(Toast.java:259) at com.brommko.android.tasweqo.firebase.MyFirebaseInstanceIDService.sendRegistrationToServer(MyFirebaseInstanceIDService.java:46) at com.brommko.android.tasweqo.firebase.MyFirebaseInstanceIDService.onTokenRefresh(MyFirebaseInstanceIDService.java:31) at com.google.firebase.iid.FirebaseInstanceIdService.zza(Unknown Source) at com.google.firebase.iid.FirebaseInstanceIdService.zzm(Unknown Source) at com.google.firebase.iid.zzb$2.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818) 

Answer 1

at com.brommko.android.tasweqo.firebase.MyFirebaseInstanceIDService.sendRegistrationToServer(MyFirebaseInstanceIDService.java:46)

可能是在子线程中更新了页面的操作，android.widget.Toast.makeText（Toast.java:259）