java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Fragment android.app.FragmentManager.findFragmentById(int)' on a null object reference

Stack Overflow | user3603935 | 5 months ago
  1. 0

    show marker of current position in google maps

    Stack Overflow | 5 months ago | user3603935
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Fragment android.app.FragmentManager.findFragmentById(int)' on a null object reference
  2. 0
    Initialize the variable before calling a method on it.
  3. 0
    Use 'dialog' to access views from custom_layout layout.
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  5. 0
    The resource was accessed after it was dismissed.
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    The parsed JSON does not contains the requested field.

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'android.app.Fragment android.app.FragmentManager.findFragmentById(int)' on a null object reference

      at com.gpstracker.viktor.gpstracker2.Home_Fragment.<init>()
    2. com.gpstracker.viktor
      GPSTracker2$1.onItemClick
      1. com.gpstracker.viktor.gpstracker2.Home_Fragment.<init>(Home_Fragment.java:82)
      2. com.gpstracker.viktor.gpstracker2.GPSTracker2.selectItemFromDrawer(GPSTracker2.java:105)
      3. com.gpstracker.viktor.gpstracker2.GPSTracker2.access$000(GPSTracker2.java:28)
      4. com.gpstracker.viktor.gpstracker2.GPSTracker2$1.onItemClick(GPSTracker2.java:67)
      4 frames
    3. Android Platform
      ActivityThread.main
      1. android.widget.AdapterView.performItemClick(AdapterView.java:310)
      2. android.widget.AbsListView.performItemClick(AbsListView.java:1145)
      3. android.widget.AbsListView$PerformClick.run(AbsListView.java:3066)
      4. android.widget.AbsListView$3.run(AbsListView.java:3903)
      5. android.os.Handler.handleCallback(Handler.java:739)
      6. android.os.Handler.dispatchMessage(Handler.java:95)
      7. android.os.Looper.loop(Looper.java:148)
      8. android.app.ActivityThread.main(ActivityThread.java:5461)
      8 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames