将活动转换为服务

Question

我一直在努力，但无法取得成功。我希望此代码转换为Service，以便我的应用程序可以在foreground中运行。非常感谢任何帮助。

我有（1）SongsManager.java我从sdCard访问歌曲并将其放在ArrayList<HashMap<String,String>>上。 （2）PlayListActivity.java我将ListView中的所有歌曲放在SongsManager.java中，当我点击某个项目时，它会转到（3）HirouMusic.java并且它将通过来自songIndex的{​​{1}}数据会触发要播放的歌曲索引。

这是我的代码。

（1）SongsManager.java

PlayListActicity

（2）PlaListActivity.java

public class SongsManager {

private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

public SongsManager(){

}


public ArrayList<HashMap<String, String>> getPlayList(Context c) {

    final Cursor mCursor = c.getContentResolver().query(
            MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
            new String[] { MediaStore.Audio.Media.DISPLAY_NAME
                        ,MediaStore.Audio.Media.ARTIST
                        ,MediaStore.Audio.Media.DURATION
                        ,MediaStore.Audio.Media.ALBUM_ID
                        ,MediaStore.Audio.Media.DATA
                        ,MediaStore.Audio.Media.MIME_TYPE }
                        , null
                        , null,
                        "LOWER(" + MediaStore.Audio.Media.TITLE + ") ASC");


    String songs_name = "";
    String song_artist= "";
    String song_duration= "";
    String song_album_id= "";
    String mAudioPath = "";

    /* run through all the columns we got back and save the data we need into the arraylist for our listview*/
    if (mCursor.moveToFirst()) {
        do {

        String file_type = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.MIME_TYPE));


            songs_name = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
            song_artist = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));
            song_duration = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));
            song_album_id= mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID));
            mAudioPath = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
            HashMap<String, String> song = new HashMap<String, String>();

            song.put("songTitle", songs_name);
            song.put("songArtist", song_artist);
            song.put("songDuration",song_duration);
            song.put("songAlbumId", song_album_id);
            song.put("songPath", mAudioPath);

            songsList.add(song);

        } while (mCursor.moveToNext());
    }   

    mCursor.close();
return songsList;
}   
}

（3）HirouMusic.java

public class PlayListActivity extends ListActivity {

// Songs list
public ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.playlist);

    ArrayList<HashMap<String, String>> songsListData = new ArrayList<HashMap<String, String>>();

    SongsManager plm = new SongsManager();
    // get all songs from sdcard
    this.songsList = plm.getPlayList(this);

    // looping through playlist
    for (int i = 0; i < songsList.size(); i++) {
        // creating new HashMap
        HashMap<String, String> song = songsList.get(i);

        // adding HashList to ArrayList
        songsListData.add(song);
    }

    // Adding menuItems to ListView
    ListAdapter adapter = new SimpleAdapter(this, songsListData,
            R.layout.playlist_item, new String[] { "songTitle","songArtist"}, new int[] {
                    R.id.songTitle, R.id.songArtis });

    setListAdapter(adapter);


    // selecting single ListView item
    ListView lv = getListView();
    // listening to single listitem click
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting listitem index
            int songIndex = position;

            // Starting new intent
            Intent in = new Intent(getApplicationContext(),
                    HirouMusic.class);

            // Sending songIndex to PlayerActivity
            in.putExtra("songIndex", songIndex);

            setResult(100, in);

            // Closing PlayListView
            finish();

        }
    });

}
}