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When running an AsyncTask I want to display a progress indicator. This stock one is ugly so I made a layout with my own. There lies the problem however, it's a separate layout meaning I need a new activity to display it.

I thought I could startActivity(~progressActivity~) and then ... destroy it? But it seems impossible to stop a child activity from the parent.

I could hide the progress indicator on the AsyncTask-invoking-activity, then when processing make it display and hide the rest of the layout. Now I need two sub-layouts in my main layout and hide one of each every time. This sounds like a hack and I don't fancy it much.

Any suggestions?

Taco de Wolff
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2 Answers2

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If you need more control over your ProgressBar, you can use WindowManager to add a view on top of everything. It can be done without any additional layout, activities or windows. You can control animation, touches, position and visibility just like in case of regular view. Fully working code:

final ProgressBar view = new ProgressBar(TestActivity.this);
view.setBackgroundColor(0x7f000000);
final LayoutParams windowParams = new WindowManager.LayoutParams();
windowParams.gravity = Gravity.CENTER;
windowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
windowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
        | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
        | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
windowParams.format = PixelFormat.TRANSLUCENT;
windowParams.windowAnimations = 0;

new AsyncTask<Integer, Integer, Integer>() {
    public void onPreExecute() {
        // init your dialog here;
        getWindowManager().addView(view, windowParams);
    }

    public void onPostExecute(Integer result) {
        getWindowManager().removeView(view);
        // process result;
    }

    @Override
    protected Integer doInBackground(Integer... arg0) {
        // do your things here
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
}.execute();
Zielony
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new AsyncTask<Params, Progress, Result>() {
   Dialog dlg = new Dialog();
   View customProgress;
   public void onPreExecute() {
       //init your dialog here;
       View customProgress = LayoutInflater.from(CurrentActivity.this).inflate(R.layout.your_progress_layout, null, false);
       dialog.setContentView(view);
       dialog.show();
   }
   public Result doInBackground(Params... params) {
    // do something
    publishProgress(progress);  
   }
   public void onProgressUpdate(Progress progress) {
    // do something with progressView;
   }
   public void onPostExecute(Result result) {
      dlg.dissmiss();
      // process result;
   }
}.execute();

This is the possible way ( only sample, may contains errors)

Firstborn
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