java.lang.RuntimeException

Unable to start activity ComponentInfo{vocabulary3000.tobiastiebes.de.vocabulary3000/vocabulary3000.tobiastiebes.de.vocabulary3000.MainMenu}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

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Solutions on the web45853

  • Unable to start activity ComponentInfo{vocabulary3000.tobiastiebes.de.vocabulary3000/vocabulary3000.tobiastiebes.de.vocabulary3000.MainMenu}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • via Coderanch by H White, 6 months ago
    Unable to start activity ComponentInfo{com.example.howar.calc/com.example.howar.calc.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • Unable to start activity ComponentInfo{com.gelajo.africancurrencyconverter/com.gelajo.africancurrencyconverter.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
  • Stack trace

    • java.lang.RuntimeException: Unable to start activity ComponentInfo{vocabulary3000.tobiastiebes.de.vocabulary3000/vocabulary3000.tobiastiebes.de.vocabulary3000.MainMenu}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2464) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2524) at android.app.ActivityThread.access$900(ActivityThread.java:154) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:234) at android.app.ActivityThread.main(ActivityThread.java:5526) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at vocabulary3000.tobiastiebes.de.vocabulary3000.MainMenu.onCreate(MainMenu.java:79) at android.app.Activity.performCreate(Activity.java:6285) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2524) at android.app.ActivityThread.access$900(ActivityThread.java:154) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:234) at android.app.ActivityThread.main(ActivityThread.java:5526)

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