Question

I am using the AsyncTask and I am getting the following error in the onProgressUpdate method:

java.lang.IllegalStateException: The
specified child already has a parent.
You must call removeView() on the
child’s parent first. at
android.view.ViewGroup.addViewInner(ViewGroup.java:1970)
at
android.view.ViewGroup.addView(ViewGroup.java:1865)
at
android.widget.TableLayout.addView(TableLayout.java:418)

I know what this error means and how to resolve it. What I do not understand is why I am getting this error ONLY in debug mode. Adding a Thread.Sleep(1000) to the doInBackground method practically negates the issue, but I cannot add that for obvious performance reasons.
Here is the gist of what is happening in my AsyncTask:

 protected Void doInBackground(Void... params) {

    row1 = TableVisuals.createRow(context, flag);
    tv1 = TableVisuals.getTextView(context, Info[0]);
    row2 = TableVisuals.createRow(context, flag);
    tv2 = TableVisuals.getTextView(context, Info[1]);
    publishProgress(i,0);

}

protected void onProgressUpdate(Integer... value) {

table.addView(row1);
row1.addView(tv1, 0, span);
table.addView(row2);
row2.addView(tv2, 0, span);

dialog.setProgress(value[0]);

}

Keep in mind, the IllegalStateException does not happen in any one part of the above code. It is inconsistent in places, but almost always occurs. I wish there was a way for the background thread to wait for the UI thread other than Thread.Sleep() because it appears that it is adding views too fast in some cases.

Answer 1

Why not to move View creation outside the task or may be in onProgressUpdate because it is running on the UI-thread, and doInBackground is not.