Question

Anybody has any idea about ProgressDialog of Andorid with Thread? I am successfully able to display the dialog and dismiss it also, but I have some long logic to be done and then only to dismiss the dialog, until that dialog will display loading message. I put my logic code inside the Run method of thread with While condition that until I didn’t get particular result it will run the code. But somehow it is giving Handler and Looper.prepare() error. I try to found this and get to know that I have to use the functionality of Handler class.

Answer 1

For the same, you can implement AsyncTask concept, and which is very much preferable in Android to implement threading task, by implementing this task, system itself handles the threading task like start, run, stop….etc. and that’s why its known as as Painless Threading.

If you have gone through AsyncTask link then i am sure you have noticed those 4 methods of AsyncTask.

For your problem, you can implement the AsyncTask as below:

1. onPreExecute() – Display progress dialog
2. doInBackground() – implement all the long running task
3. onPostExecute() – dismiss progress dialog by calling dialog.dismiss();

I am sure you got it now.

All the best.

Update:

you just need to write Dialog.Show() method inside the onPreExecute() method, and dialog.dismiss() inside the onPostExecute() method. And yes i have told 1000 times that you can’t write Toast directly inside the doInBackground() method because Android doesn’t allows to ride on the main thread, and if you still want to execute it then write the same Toast message inside the runOnUiThead method (this method should be inside the doInBackground().