Wie kann ich eine playlist erstellt von android Standard-Musik-app und Aufruf der Musik-app zu spielen?

Diese Aktivität kombiniert Ankur Pandya ' s zwei Antworten auf die Liste der Wiedergabelisten auf dem Gerät und spielen Sie dann den ersten track aus der ersten playlist.

package com.withoutstones.pandyaplaylists;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;

/**
 * @author Ankur Pandya
 * @author Tommy Herbert
 */
public class PandyaPlaylistsActivity extends Activity {

    //constants

    private static final String LOGGING_TAG = "PandyaPlaylists";

    //static methods

    /**
     * Create a MediaPlayer and play the specified audio file. Note that a full app would usually
     * call stop() and release() on the player after use.
     * 
     * @param path
     *            to data file
     */
    public static void playAudio(final String path) {
        final MediaPlayer player = new MediaPlayer();
        if (path == null) {
            Log.e(LOGGING_TAG, "Called playAudio with null data stream.");
            return;
        }
        try {
            player.setDataSource(path);
            player.prepare();
            player.start();
        } catch (Exception e) {
            Log.e(LOGGING_TAG, "Failed to start MediaPlayer: " + e.getMessage());
            return;
        }
    }

    //superclass overrides

    @Override
    public void onCreate(final Bundle savedInstanceState) {

        //Create the superclass portion of the object.
        super.onCreate(savedInstanceState);

        //Set up the UI.
        this.setContentView(R.layout.main);

        //Get a cursor over all playlists.
            final ContentResolver resolver = this.getContentResolver();
        final Uri uri = MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI;
        final String idKey = MediaStore.Audio.Playlists._ID;
        final String nameKey = MediaStore.Audio.Playlists.NAME;
        final String[] columns = { idKey, nameKey };
        final Cursor playLists = resolver.query(uri, columns, null, null, null);
        if (playLists == null) {
            Log.e(LOGGING_TAG, "Found no playlists.");
            return;
        }

        //Log a list of the playlists.
        Log.i(LOGGING_TAG, "Playlists:");
        String playListName = null;
        for (boolean hasItem = playLists.moveToFirst(); hasItem; hasItem = playLists.moveToNext()) {
            playListName = playLists.getString(playLists.getColumnIndex(nameKey));
            Log.i(LOGGING_TAG, playListName);
        }

        //Play the first song from the first playlist.
        playLists.moveToFirst();
        final long playlistID = playLists.getLong(playLists.getColumnIndex(idKey));
        this.playTrackFromPlaylist(playlistID);

        //Close the cursor.
        if (playLists != null) {
            playLists.close();
        }
    }

    //PandyaPlaylistsActivity instance methods

    /**
     * Play the first track on the specified playlist.
     * 
     * @param playListID
     *            from the MediaStore database
     */
    public void playTrackFromPlaylist(final long playListID) {
            final ContentResolver resolver = this.getContentResolver();
        final Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playListID);
        final String dataKey = MediaStore.Audio.Media.DATA;
        Cursor tracks = resolver.query(uri, new String[] { dataKey }, null, null, null);
        if (tracks != null) {
            tracks.moveToFirst();
            final int dataIndex = tracks.getColumnIndex(dataKey);
            final String dataPath = tracks.getString(dataIndex);
            PandyaPlaylistsActivity.playAudio(dataPath);
            tracks.close();
        }
    }
}

InformationsquelleAutor der Antwort Tommy Herbert