java.lang.RuntimeException: Unable to start activity ComponentInfo{zaaa.trinki/zaaa.trinki.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference

Stack Overflow | Jbb | 5 months ago
  1. 0

    API doesnt work and progressBar keeps spinning

    Stack Overflow | 5 months ago | Jbb
    java.lang.RuntimeException: Unable to start activity ComponentInfo{zaaa.trinki/zaaa.trinki.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
  2. 0

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

    Stack Overflow | 3 months ago | Kobby Genius
    java.lang.RuntimeException: Unable to resume activity {com.blogspot.tipsberk.ultimatemap/com.blogspot.tipsberk.ultimatemap.SignupActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
  3. 0

    Unknown Source when I use Proguard

    Stack Overflow | 2 years ago | Ralph Bergmann
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
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  5. 0

    当程序没有联网的时候会报错

    GitHub | 3 months ago | z244370114
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
  6. 0

    Unknown Source when I use Proguard

    Stack Overflow | 2 years ago | Ralph Bergmann
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

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

      at zaaa.trinki.retrievePriceTask.onPreExecute()
    2. zaaa.trinki
      retrievePriceTask.onPreExecute
      1. zaaa.trinki.retrievePriceTask.onPreExecute(MainActivity.java:94)
      1 frame
    3. Android Platform
      AsyncTask.execute
      1. android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
      2. android.os.AsyncTask.execute(AsyncTask.java:535)
      2 frames
    4. zaaa.trinki
      MainActivity.onCreate
      1. zaaa.trinki.MainActivity.onCreate(MainActivity.java:55)
      1 frame
    5. Android Platform
      ActivityThread.performLaunchActivity
      1. android.app.Activity.performCreate(Activity.java:5933)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
      3 frames