java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

Stack Overflow | DarkVex | 4 months ago
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    Barcode Fragment "invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference"

    Stack Overflow | 4 months ago | DarkVex
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

      at com.fastnetserv.barcodeapp.Barcode.onResume()
    2. com.fastnetserv.barcodeapp
      Barcode.onResume
      1. com.fastnetserv.barcodeapp.Barcode.onResume(Barcode.java:86)
      1 frame
    3. Android Support v4
      FragmentManagerImpl$1.run
      1. android.support.v4.app.Fragment.performResume(Fragment.java:2020)
      2. android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1107)
      3. android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
      4. android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742)
      5. android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
      6. android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
      6 frames
    4. Android Platform
      ActivityThread.main
      1. android.os.Handler.handleCallback(Handler.java:739)
      2. android.os.Handler.dispatchMessage(Handler.java:95)
      3. android.os.Looper.loop(Looper.java:135)
      4. android.app.ActivityThread.main(ActivityThread.java:5254)
      4 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
      2 frames