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

There are no available Samebug tips for this exception. Do you have an idea how to solve this issue? A short tip would help users who saw this issue last week.

  • Change code to android annotations
    via Stack Overflow by Gorthez
    ,
    • 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(MainActivity.java:83) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:604) at android.os.AsyncTask.execute(AsyncTask.java:551) at com.example.albertpula.apka3.MainActivity.click(MainActivity.java:54) at com.example.albertpula.apka3.MainActivity_$1.onClick(MainActivity_.java:72) at android.view.View.performClick(View.java:5198) at android.view.View$PerformClick.run(View.java:21147) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    No Bugmate found.