how to do thread operations in android

Anyone give example program which explains android Threads in a simpler way. For example, i want to list out the songs in a sd card in thread at the time of launch

i am using the following code to get the number of songs in sd card of an android device. From this i want to list out the songs in thread

private void init_phone_sd_card() 
    {   
        System.gc();
        final String[] proj = { MediaStore.Audio.Media._ID,MediaStore.Audio.Media.DATA,MediaStore.Audio.Media.DISPLAY_NAME,MediaStore.Audio.Media.SIZE };
        Log.e("media",""+proj);

        musiccursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,proj, null, null, null);
        Log.e("media1",""+musiccursor);

       开发者_Python百科 count = musiccursor.getCount();
        Log.e("media2",""+count);

how to do this......

Thx

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Just put your code to AsyncTask's doInBackground() method. Task also should show ProgressDialog in order to tell user that some useful work is running. See this article.

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If you are asking for a simple thread operation, this will help you..

Or you might want to use Async class like the one below,

    class AddStringTask extends AsyncTask<Void, String, Void> {
    @Override
    protected Void doInBackground(Void... unused) {
        for (String item : items) {
            publishProgress(item);
            SystemClock.sleep(1000);
        }

        return(null);
    }

    @Override
    protected void onProgressUpdate(String... item) {
        ((ArrayAdapter)getListAdapter()).add(item[0]);
    }

    @Override
    protected void onPostExecute(Void unused) {
        Toast
            .makeText(Async.this, 
                    "Done",
                    Toast.LENGTH_SHORT)
            .show();
    }
}

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You need a simpler explanation. Simpler than what?

Have a look at the Android Process and Thread fundamentals and the painless threading article and its AsyncTask sections.