alert dialog inside asynctask in android

Question

I need to show the Alertdialog inside Asynctaskin android , but it won`t show in throws exception.

05-13 14:59:35.522: WARN/System.err(1179): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

Thanks.

score 11 · Accepted Answer · answered May 13 '11 at 09:56

11

It isn't possible to manipulate the UI from the background thread. Use handler or the onPre/Post methods of the AsyncTask for that.

answered May 13 '11 at 09:56

Stephan

7,360
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score 3 · Answer 2 · answered May 13 '11 at 09:59

3

Show the dialog in onPostExecute() method rather than doInBackground.

Hope that helps

answered May 13 '11 at 09:59

Omar Rehman

2,045
17
17

score 2 · Answer 3 · answered Jun 03 '13 at 17:04

There's no problem with reaching UI Thread from backGround thread (more clear: from doInBackground() method): you just have to run runOnUiThread() method on your context. In my case I'm calling it from doInBackground() body.

ContactsViewerActivity.this.runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    AlertDialog.Builder builder = new AlertDialog.Builder(ContactsViewerActivity.this);
                        builder.setTitle("Connection problem..")
                        .setMessage("Could not connect to " + url + ", " +
                                "try changing your host in the settings to default one :" +
                                getResources().getString(R.string.default_server_ip) + ":" +  
                                getResources().getString(R.string.default_server_port)) 
                        .setNegativeButton("OK", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                dialog.cancel();
                            }
                        });
                        AlertDialog alert = builder.create();
                        alert.show();
                }
            });

score 2 · Answer 4 · edited May 23 '17 at 12:04

2

I think this might be your problem -- you can't show a dialog from inside doInBackground.

edited May 23 '17 at 12:04

Community

1
1

answered May 13 '11 at 09:57

Ben Williams

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score 0 · Answer 5 · answered Feb 01 '13 at 21:40

0

You can call publishProgress() right from doInBackground() and manipulate with UI in onProgressUpdate().

answered Feb 01 '13 at 21:40

Ihor DIM

689
1
10
22

alert dialog inside asynctask in android

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