我一直在网上搜索，但找不到解决方案。我有一个音乐播放器服务类，在后台播放歌曲即服务。问题是我无法将片段绑定到此服务。在logcat中没有显示错误，也没有应用程序崩溃。当我点击其中一首歌时没有任何反应。这是我的代码：
服务类：
public class MediaPlayerService extends Service implements MediaPlayer.OnCompletionListener,
MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener, MediaPlayer.OnSeekCompleteListener,
MediaPlayer.OnInfoListener, MediaPlayer.OnBufferingUpdateListener,
AudioManager.OnAudioFocusChangeListener {
private final IBinder iBinder = new LocalBinder();
private static MediaPlayer mediaPlayer = new MediaPlayer();
private String mediaFile;
private int resumePosition;
private AudioManager audioManager;
//Handle incoming phone calls
private boolean ongoingCall = false;
private PhoneStateListener phoneStateListener;
private TelephonyManager telephonyManager;
private ArrayList<SongInfoModel> songsServiceList = new ArrayList<>();
private int songPosn;
private int currentIndex ;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return iBinder;
}
private void initMediaPlayer() {
//Set up MediaPlayer event listeners
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.setOnErrorListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setOnBufferingUpdateListener(this);
mediaPlayer.setOnSeekCompleteListener(this);
mediaPlayer.setOnInfoListener(this);
//Reset so that the MediaPlayer is not pointing to another data source
mediaPlayer.reset();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
@Override
public void onCreate() {
super.onCreate();
songPosn=0;
initMediaPlayer();
}
public void setList(ArrayList<SongInfoModel> theSongs){
songsServiceList=theSongs;
}
public void setSong(int songIndex){
songPosn=songIndex;
}
public void playSong(){
//play a song
mediaPlayer.reset();
//get song
SongInfoModel playSong = songsServiceList.get(songPosn);
//get id
long currSong = playSong.getSongID();
//set uri
Uri trackUri = ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
currSong);
try{
mediaPlayer.setDataSource(getApplicationContext(), trackUri);
}
catch(Exception e){
Log.e("MUSIC SERVICE", "Error setting data source", e);
}
mediaPlayer.prepareAsync();
MainActivity.handleSeekbar(mediaPlayer);
}
@Override
public void onBufferingUpdate(MediaPlayer mediaPlayer, int i) {
}
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.reset();
songPosn++;
if(songPosn>=songsServiceList.size()) songPosn=0;
playSong();
}
@Override
public boolean onError(MediaPlayer mediaPlayer, int i, int i1) {
return false;
}
@Override
public boolean onInfo(MediaPlayer mediaPlayer, int i, int i1) {
return false;
}
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
mediaPlayer.reset();
} else {
mediaPlayer.start();
MainActivity.Handler(mediaPlayer);
}
}
public class LocalBinder extends Binder {
public MediaPlayerService getService() {
return MediaPlayerService.this;
}
}
FragmentClass：
public class Songs extends Fragment {
public static final String TAG = "Songs";
RecyclerView recyclerView;
private ArrayList<SongInfoModel> SongList = new ArrayList<SongInfoModel>();
SongAdapter songAdapter;
ScaleInAnimationAdapter alphaAdapter;
private MediaPlayerService player2;
boolean serviceBound2 = false;
private Intent playIntent2;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.songs_activity, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(linearLayoutManager);
songAdapter = new SongAdapter(getContext(), SongList, new SongAdapter.RecyclerItemClickListener() {
@Override
public void onClickListener(SongInfoModel song, int position) {
Toast.makeText(getContext(), song.getSongName(), Toast.LENGTH_SHORT).show();
MainActivity.setsongText(song);
MainActivity.ButtonPlay();
MainActivity.PauseImage();
if(serviceBound2 == true) {
player2.setSong(position);
player2.playSong();
}
}
@Override
public void onLongClickListener(SongInfoModel song, int position) {
Toast.makeText(getContext(), "You long clicked me, thank you!", Toast.LENGTH_SHORT).show();
}
});
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + "!=0";
Cursor cursor = getActivity().getContentResolver().query(uri, null, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
do {
long id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media._ID));
String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
Long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
Long albumId = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId);
SongInfoModel s = new SongInfoModel(id, name, artist, null, null, null, duration, data,albumArtUri, albumId);
SongList.add(s);
} while (cursor.moveToNext());
}
cursor.close();
Collections.sort(SongList, new Comparator<SongInfoModel>() {
@Override
public int compare(SongInfoModel lhs, SongInfoModel rhs) {
return lhs.getSongName().compareTo(rhs.getSongName());
}
});
}
alphaAdapter = new ScaleInAnimationAdapter(songAdapter);
alphaAdapter.setDuration(1000);
alphaAdapter.setInterpolator(new OvershootInterpolator());
alphaAdapter.setFirstOnly(false);
recyclerView.setAdapter(alphaAdapter);
songAdapter.notifyDataSetChanged();
return view;
}
//Binding this Client to the AudioPlayer Service
private ServiceConnection serviceConnection2 = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// We've bound to LocalService, cast the IBinder and get LocalService instance
MediaPlayerService.LocalBinder binder = (MediaPlayerService.LocalBinder) service;
player2 = binder.getService();
player2.setList(SongList);
serviceBound2 = true;
Toast.makeText(getContext(), "Service Bound", Toast.LENGTH_SHORT).show();
}
@Override
public void onServiceDisconnected(ComponentName name) {
serviceBound2 = false;
}
};
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if(playIntent2==null && serviceBound2==true){
playIntent2 = new Intent(getActivity(), MediaPlayerService.class);
getActivity().bindService(playIntent2, serviceConnection2, Context.BIND_AUTO_CREATE);
getActivity().startService(playIntent2);
}
}