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

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  1. 0

    Loading ProgresBar in Webview

    Stack Overflow | 1 month ago | Michał Musiał
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference
  2. 0

    Fragment null must be a public static class to be properly recreated from instance state.

    GitHub | 4 months ago | kathanshah
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.app.Activity.findViewById(int)' on a null object reference
  3. 0

    GitHub comment 31#263815783

    GitHub | 4 months ago | kathanshah
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.app.Activity.findViewById(int)' on a null object reference
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  5. 0

    空指针了

    GitHub | 4 months ago | HYVincent
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setVisibility(int)' on a null object reference
  6. 0

    Unable to load image before loading URL on WebView

    Stack Overflow | 4 months ago | user1650978
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.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 musial.pzstis.com.pzstiz.Main2Activity$myWebClient.onPageFinished()
    2. musial.pzstis.com
      Main2Activity$myWebClient.onPageFinished
      1. musial.pzstis.com.pzstiz.Main2Activity$myWebClient.onPageFinished(Main2Activity.java:66)
      1 frame
    3. com.android.webview
      WebViewContentsClientAdapter.onPageFinished
      1. com.android.webview.chromium.WebViewContentsClientAdapter.onPageFinished(WebViewContentsClientAdapter.java:531)
      1 frame
    4. org.chromium.android_webview
      AwContentsClientCallbackHelper$MyHandler.handleMessage
      1. org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.handleMessage(AwContentsClientCallbackHelper.java:188)
      1 frame
    5. Android Platform
      ActivityThread.main
      1. android.os.Handler.dispatchMessage(Handler.java:102)
      2. android.os.Looper.loop(Looper.java:154)
      3. android.app.ActivityThread.main(ActivityThread.java:6119)
      3 frames
    6. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    7. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
      2 frames