java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference

Stack Overflow | user1336491 | 5 months ago
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    Force close when back button pressed on fragment

    Stack Overflow | 5 months ago | user1336491
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference
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    Navigation Drawer NullPointerException on setDrawerListener

    Stack Overflow | 7 months ago | DaxHR
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.setDrawerListener(android.support.v4.widget.DrawerLayout$DrawerListener)' on a null object reference
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    How to rectify NullPointerException in v4.DrawerLayout?

    pr8x.com | 12 months ago
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.motobeans.productions.aloha/com.motobeans.productions.aloha.Activity_test}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.setDrawerListener(android.support.v4.widget.DrawerLayout$DrawerListener)' on a null object reference
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    Null Pointer Exception on DrawerLayout.addDrawerListener

    Stack Overflow | 8 months ago | Jishnu
    java.lang.RuntimeException: Unable to start activity ComponentInfo{org.project.project/org.project.project.main.MainPage}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.addDrawerListener(android.support.v4.widget.DrawerLayout$DrawerListener)' on a null object reference
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    How to open an Image from on Itemclick listener

    Stack Overflow | 7 months ago | Neelay Srivastava
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.union.project/com.union.project.Swipeview.Main4Activity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference

      at com.example.khan.abc.AudioFragment$1.onClick()
    2. com.example.khan
      AudioFragment$1.onClick
      1. com.example.khan.abc.AudioFragment$1.onClick(AudioFragment.java:125)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:4848)
      2. android.view.View$PerformClick.run(View.java:20262)
      3. android.os.Handler.handleCallback(Handler.java:815)
      4. android.os.Handler.dispatchMessage(Handler.java:104)
      5. android.os.Looper.loop(Looper.java:194)
      6. android.app.ActivityThread.main(ActivityThread.java:5631)
      6 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
      2 frames