Question

Im having trouble making things happen in order instead of together in android.

For instance when a user clicks a Button, I want a ProgressDialog to be displayed first, then dismissed, and then TextView changed. Would I need to make a method for each of these or is it something i can implement to make this happen.

Thanks for anyone who helps.

Answer 1

You can use an AsyncTask to accomplish this. Override doInBackground and use publishProgress and onProgressUpdate to update your progress bar. Then, in onPostExecute, update your TextView.

An example (without the publishProgress and onProgressUpdate):

    mTextView = (TextView) findViewById(R.id.text1);

    new AsyncTask<Void, Integer, Void>() {
        private ProgressDialog mProgressDialog;

        @Override
        protected Void doInBackground(Void... arg0) {
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            mTextView.setText("All Done");
            mProgressDialog.dismiss();
        }

        @Override
        protected void onPreExecute() {
            mProgressDialog = ProgressDialog.show(Welcome.this, "Progress title", "Progress message", true);
        }

    }.execute((Void) null);