java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference

Stack Overflow | BraveHeart | 2 months ago
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    Calling one of my Main Activity Method From another Class Returns an Error

    Stack Overflow | 2 months ago | BraveHeart
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
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    MyApplication Kapandı Hatası | Geleceği Yazanlar

    com.tr | 4 months ago
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
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    Stack Overflow | 7 months ago | Aulia Rifkyano
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    Created Android App but keeps getting stopped error

    Stack Overflow | 6 months ago | Tim Sharpe
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mylondonnews.knowbrockvilleuser.mybrockvillenews/com.mylondonnews.knowbrockvilleuser.mybrockvillenews.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference

      at android.support.v7.app.AppCompatDelegateImplBase.<init>()
    2. Android v7
      AppCompatActivity.findViewById
      1. android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:68)
      2. android.support.v7.app.AppCompatDelegateImplV7.<init>(AppCompatDelegateImplV7.java:145)
      3. android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:28)
      4. android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:41)
      5. android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:29)
      6. android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:186)
      7. android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:170)
      8. android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:502)
      9. android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:174)
      9 frames
    3. wifiexplorer.braveheart.com
      SecondActivity$1.onClick
      1. wifiexplorer.braveheart.com.classtest.MainActivity.function(MainActivity.java:20)
      2. wifiexplorer.braveheart.com.classtest.SecondActivity$1.onClick(SecondActivity.java:22)
      2 frames
    4. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:5277)
      2. android.view.View$PerformClick.run(View.java:21711)
      3. android.os.Handler.handleCallback(Handler.java:815)
      4. android.os.Handler.dispatchMessage(Handler.java:104)
      5. android.os.Looper.loop(Looper.java:207)
      6. android.app.ActivityThread.main(ActivityThread.java:5896)
      6 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
      2 frames