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Editorial Team
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Asked: 2026-05-22T13:00:00+00:00

I have a layout containing a WebView, and a ProgressBar centred on top of

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I have a layout containing a WebView, and a ProgressBar centred on top of it. The progress bar needs to be shown and hid programatticaly (as web content loads). However, setting the ProgressBar to be visible using loading.setVisibility(View.VISIBLE);, causes a force close. If the ProgressBar is visible by default it works fine. I will paste all appropriate code if needed, but I suspect I’m doing something fundamentally and simply wrong.

(should have force-close tag but neither it nor forceclose exists and I can’t create it.)

Okay, code. The setVisibility is simply:

  public void nowLoading() {
        loading.setVisibility(View.VISIBLE);
    }

nowLoading is called… via javascript, with addJavascriptInterface on the WebView. Ahh… I imagine the WevView is in a different Thread. How do I solve that?

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1 Answer

  1. Editorial Team

    You are probably changing the visibility from the wrong thread. Are you doing the visibility change in a new Thread you started with Thread.start()?

    EDIT: use a Handler (see http://developer.android.com/reference/android/os/Handler.html). Send a Message to the Handler and then do the visibility change from the Handler. Or use View.post (see http://developer.android.com/reference/android/view/View.html#post%28java.lang.Runnable%29).

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