Posting Toast message from a Thread

Question

My application launches a thread to query the web for some data. I want to display a Toast message when nothing is found, but my application always crashes.

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Answer 1

Toast.makeText().show() definitely needs to be run on the UI thread.

You should probably use an AsyncTask like Octavian Damiean mentioned, but here's some code using runOnUiThread if you're set on using that:

    public void showToastFromBackground(final String message) {
    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            Toast.makeText(this, message, Toast.LENGTH_LONG).show();
        }
    });
}