Question

I want to add a simple process bar to my code with asy task. I tryed some exampels but cant see that process bar working.
I post here my code hope you can help me.
I want to stop process bar when some of my code is done like with some flag to stop the proses bar.
plese post some code.

thanks a lot!

here my code:

private class loading extends AsyncTask<Void, Void, Integer> {

    Context context;
    ProgressBar progressBar;
    static final long waitTime = 1 * 4000L;
    long preTime;
    int progress;

    public loading(Context context) {

        this.context = context;
        progressBar = (ProgressBar) findViewById(R.id.progress_bar);
        progressBar.setProgress(0);

    }

    protected void onPostExecute(Integer result) {
        Intent intent = new Intent(this.context, first.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        context.startActivity(intent);
        finish();
  return;
    }

    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
    preTime = System.currentTimeMillis();

    }

    protected void onProgressUpdate(Integer... values) {
        progressBar.setProgress(values[0]);

    }

    @Override
    synchronized protected Integer doInBackground(Void... arg0) {
        int waited = 0;
        while (waited < 3000) {
            try {


                //   SystemClock.sleep(100); 
                this.wait(100);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            waited += 100;
        }
        return null;



    }
}

Answer 1

Your doInBackground method needs to call publishProgress() in order for you to update the UI.

After the line waited += 100; add:

int progress = Math.round((float)waited / 3000 * 100);
publishProgress(progress);

Also, the signature of AsyncTask is wrong if you intend on using an integer to reflect your progress. The generic parameters are AsyncTask<Params, Progress, Result>, so in your case, you’re not accepting any arguments, or returning any meaningful value from doInBackground, but, you do want to return an Integer to indicate progress. So, change your class declaration to match:

private class loading extends AsyncTask<Void, Integer, Integer>
{
    //your implementation
}