java.lang.IllegalStateException: Could not execute method for android:onClick

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  1. 0

    Button.setVisibility crashed Android Application

    Stack Overflow | 6 months ago | Jackson Hoagland
    java.lang.IllegalStateException: Could not execute method for android:onClick

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.Button.setVisibility(int)' on a null object reference

      at com.example.jackson.myfirstapp.MainActivity.beginGame()
    2. com.example.jackson
      MainActivity.beginGame
      1. com.example.jackson.myfirstapp.MainActivity.beginGame(MainActivity.java:29)
      1 frame
    3. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    4. Android v7
      AppCompatViewInflater$DeclaredOnClickListener.onClick
      1. android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
      1 frame
    5. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:5198)
      2. android.view.View$PerformClick.run(View.java:21147)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:148)
      6. android.app.ActivityThread.main(ActivityThread.java:5417)
      6 frames
    6. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    7. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames