Question

我无法弄清楚应用程序运行时导致此错误的原因。它导致应用程序停止。睡眠主线程完成异步线程的执行是不正确的做法。如果是这样，为什么和什么是好的做法？

java.lang.IllegalStateException: Could not execute method for android:onClick
    at android.view.View$DeclaredOnClickListener.onClick(View.java:4707)
    at android.view.View.performClick(View.java:5619)
    at android.view.View$PerformClick.run(View.java:22295)
    at android.os.Handler.handleCallback(Handler.java:754)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:163)
    at android.app.ActivityThread.main(ActivityThread.java:6342)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)
 Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invoke(Native Method)
    at android.view.View$DeclaredOnClickListener.onClick(View.java:4702)
    at android.view.View.performClick(View.java:5619) 
    at android.view.View$PerformClick.run(View.java:22295) 
    at android.os.Handler.handleCallback(Handler.java:754) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:163) 
    at android.app.ActivityThread.main(ActivityThread.java:6342) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770) 
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
    at com.example.sairahul5223.e_bot.Main4Activity.onButtonClickName43(Main4Activity.java:330)
    at java.lang.reflect.Method.invoke(Native Method) 
    at android.view.View$DeclaredOnClickListener.onClick(View.java:4702) 
    at android.view.View.performClick(View.java:5619) 
    at android.view.View$PerformClick.run(View.java:22295) 
    at android.os.Handler.handleCallback(Handler.java:754) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:163) 
    at android.app.ActivityThread.main(ActivityThread.java:6342) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770)

Answer 1

第一件事：我们不使主线程休眠，因为这会导致应用程序无响应（ANR）错误。

要获取异步任务的结果，我们通常使用回调来确定任务的状态。看看这个答案，给你一个想法：How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?

应用程序运行时出现Android App错误

1 个答案: