How to raise a toast in AsyncTask, I am prompted to used the Looper

Question

I have tasks completed by AsyncTask in background. At some point I need to issue a Toast that something is completed.

I've tried and I failed because Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

How can I do that?

Answer 1

onPostExecute - executes on UI thread or publishProgress(); in your doinbackground and

protected void onProgressUpdate(Integer... progress) { } 

http://developer.android.com/reference/android/os/AsyncTask.html

Answer 2

you can Toast inside doInBackground

add this code where you want to Toast appear

runOnUiThread(new Runnable() { public void run() {      Toast.makeText(<your class name>.this, "Cool Ha?", Toast.LENGTH_SHORT).show();     } }); 

Answer 3

You can also use runOnUiThread method to manipulate your UI from background threads.

Answer 4

If you want to use Toast You should use this method : onProgressUpdate()

protected Integer doInBackground(Void...Params) {
   int check_point = 1;
   publishProgress(check_point);
   return check_point;
}

protected void onProgressUpdate(Integer integers) {
  if(integers == 1) {
    Toast.makeText(classname.this, "Text", 0).show(); 
}