Question

I’m writing an Android application that streams live radio. I’ve set up an async task to display a progress dialog whilst the stream is loading. This works fine, however when it encounters a stream that is “down” and not functioning my app crashes and I just want to know the best way to handle the error.

Here is the code:

public class loadingData extends AsyncTask<Object, Object, Object>{


    protected void onPreExecute() {

        progDialog = new ProgressDialog(radioplayer.this);
            progDialog.setMessage("Loading radio station");
            progDialog.setIndeterminate(true);
            progDialog.setCancelable(false);
            progDialog.show();

    }   
    protected Object doInBackground(Object... arg0) {

        prs.setStation(strStation);        
        return null;
    }   
    protected void onCancelled() {

        super.onCancelled();
    }
    protected void onPostExecute(Object result) {

        progDialog.hide();
    }
    protected void onProgressUpdate(Object... values) {     
    }   
}

Answer 1

What you can do (I’m using this trick in my app) is this:

protected Object doInBackground(Object... arg0) {
    try {
        prs.setStation(strStation);
        return null;
    }
    catch(Exception ex)
    {
        return ex;
    }
}


protected void onPostExecute(Object result) {
    progDialog.hide();         
    if(result != null && result instanceof Exception) {
        String errText = ((Exception)result).getMessage();
        //now deal with your exception on the UI thread
    }
}