java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference

Stack Overflow | Gorthez | 5 months ago
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    Change code to android annotations

    Stack Overflow | 5 months ago | Gorthez
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference

      at com.example.albertpula.apka3.MainActivity$ReadPic.onPreExecute()
    2. com.example.albertpula
      MainActivity$ReadPic.onPreExecute
      1. com.example.albertpula.apka3.MainActivity$ReadPic.onPreExecute(MainActivity.java:83)
      1 frame
    3. Android Platform
      AsyncTask.execute
      1. android.os.AsyncTask.executeOnExecutor(AsyncTask.java:604)
      2. android.os.AsyncTask.execute(AsyncTask.java:551)
      2 frames
    4. com.example.albertpula
      MainActivity_$1.onClick
      1. com.example.albertpula.apka3.MainActivity.click(MainActivity.java:54)
      2. com.example.albertpula.apka3.MainActivity_$1.onClick(MainActivity_.java:72)
      2 frames
    5. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:5198)
      2. android.view.View$PerformClick.run(View.java:21147)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:148)
      6. android.app.ActivityThread.main(ActivityThread.java:5417)
      6 frames
    6. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    7. 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