我一直在努力，但无法取得成功。我希望这些代码在Service中转换，以便我的应用程序可以在前台运行。任何帮助将非常感谢。我是android的新手，我需要立即行动。
我有（1）SongsManager.java，我从sdCard访问歌曲并将其放在ArrayList＆gt;上。 （2）PlayListActivity.java，我将所有歌曲放在SongsManager.java的ListView中，当我点击一个项目时，它将转到（3）HirouMusic.java，它将传递来自PlayListActicity的songIndex数据，这将触发什么歌曲索引玩。
这是我的代码。
（1）SongsManager.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;
}
}
（2）PlaListActivity.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();
}
});
}
}
（3）HirouMusic.java
public class HirouMusic extends Activity implements OnCompletionListener,
SeekBar.OnSeekBarChangeListener {
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.player);
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
btnForward = (ImageButton) findViewById(R.id.btnForward);
btnBackward = (ImageButton) findViewById(R.id.btnBackward);
btnNext = (ImageButton) findViewById(R.id.btnNext);
btnPrevious = (ImageButton) findViewById(R.id.btnPrevious);
btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);
btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);
btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) findViewById(R.id.songTitle);
songAlbum = (TextView) findViewById(R.id.songAlbum);
songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
details =(Button) findViewById(R.id.btnDetails);
songAlbumArt = (ImageView) findViewById(R.id.songAlbumArt);
mp = new MediaPlayer();
songManager = new SongsManager();
utils = new Utilities();
// Listeners
songProgressBar.setOnSeekBarChangeListener(this); // Important
mp.setOnCompletionListener(this); // Important
// Getting all songs list
songsList = songManager.getPlayList(this);
// By default play first song
//playSong(0);
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// check for already playing
if(mp.isPlaying()){
if(mp!=null){
mp.pause();
btnPlay.setImageResource(R.drawable.btn_play);
}
}else{
// Resume song
if(mp!=null){
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(isShuffle){
Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);
}
else{
// check if next song is there or not
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
// play first song
playSong(0);
currentSongIndex = 0;
}
}
}
});
/**
* Back button click event
* Plays previous song by currentSongIndex - 1
* */
btnPrevious.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(currentSongIndex > 0){
playSong(currentSongIndex - 1);
currentSongIndex = currentSongIndex - 1;
}else{
// play last song
playSong(songsList.size() - 1);
currentSongIndex = songsList.size() - 1;
}
}
});
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 100) {
currentSongIndex = data.getExtras().getInt("songIndex");
// play selected song
playSong(currentSongIndex);
}
} // end
/**
* Function to play a song
* */
public void playSong(int songIndex){
// Play song
try {
mp.reset();
mp.setDataSource(songsList.get(songIndex).get("songPath"));
mp.prepare();
mp.start();
// Displaying Song title
String songTitle = songsList.get(songIndex).get("songTitle");
songTitleLabel.setText(songTitle);
String songAlbum2 = songsList.get(songIndex).get("songArtist");
songAlbum.setText(songAlbum2);
@Override
public void onCompletion(MediaPlayer arg0) {
// check for repeat is ON or OFF
if(isRepeat){
// repeat is on play same song again
playSong(currentSongIndex);
} else if(isShuffle){
// shuffle is on - play a random song
Random rand = new Random();
currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
playSong(currentSongIndex);
} else{
// no repeat or shuffle ON - play next song
if(currentSongIndex < (songsList.size() - 1)){
playSong(currentSongIndex + 1);
currentSongIndex = currentSongIndex + 1;
}else{
// play first song
playSong(0);
currentSongIndex = 0;
}
}
}
}
答案 0 :(得分：0)
public ArrayList<HashMap<String, String>> getPlayList4(Context resolver){
Cursor cursor = resolver.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
new String [] {"ARTIST", "DURATION", "TITLE", "_DATA", "ALBUM"}, null, null, null);
while(cursor.moveToNext()) {
HashMap<String, String> song = new HashMap<String, String>();
song.put("artist", cursor.getString(0));
song.put("duration", cursor.getString(1));
song.put("songTitle", cursor.getString(2));
song.put("songPath",cursor.getString(3));
song.put("album",cursor.getString(4));
// Adding each song to SongList
songsList.add(song);
}
return songsList;
}