ServiceConnection onServiceConnected未调用

Question

在Service对象上获得空对象错误。此方法不是初始化

private ServiceConnection musicConnection = new ServiceConnection()

其方含接头主机那么这Fragment。

public class PrimaryFragment extends Fragment { 
    RecyclerView rv; 
    LazyAdapter adapter; 
    ListView listView; 
    View rootView; 
    private MusicService serviceMusic; 
    ArrayList<AudioListModel> songsList; 
    private Intent playIntent; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     rootView = inflater.inflate(R.layout.primary_layout, container, false); 

     songsList = SongsManager.GetSongs(); 

     adapter = new LazyAdapter(getActivity(), songsList.toArray(new AudioListModel[songsList.size()])); 
     //rv = (RecyclerView) rootView.findViewById(R.id.songs_recycleview); 

     listView = (ListView) rootView.findViewById(R.id.SongList); 
     LazyAdapter ad = new LazyAdapter(getActivity(), songsList.toArray(new AudioListModel[songsList.size()])); 

     listView.setItemsCanFocus(false); 
     listView.setAdapter(ad); 
     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       //Toast.makeText(getActivity(), position + "this is on click event", Toast.LENGTH_SHORT).show(); 

       serviceMusic.setSelectedSong(position, MusicService.NOTIFICATION_ID); // getting error here...... 

       Intent i = new Intent(getActivity(), PlaySongActivity.class); 
       startActivity(i); 
      } 
     }); 

     return rootView; 
    } 

    // This method is not initializing. 
    private ServiceConnection musicConnection = new ServiceConnection() { 
     @Override 
     public void onServiceConnected(ComponentName name, IBinder service) { 
      MusicService.PlayerBinder binder = (MusicService.PlayerBinder) service; 
      //get servic1 
      serviceMusic = binder.getService(); 
      serviceMusic.setSongList(songsList); 
     } 

     @Override 
     public void onServiceDisconnected(ComponentName name) { 

     } 
    }; 

    @Override 
    public void onStart() { 
     super.onStart(); 
     //Start service 
     //Toast.makeText(getActivity(), "before onStart", Toast.LENGTH_SHORT).show(); 
     if (playIntent == null) { 
      //Toast.makeText(getActivity(), "after onStart", Toast.LENGTH_SHORT).show(); 
      playIntent = new Intent(getActivity(), MusicService.class); 
      getActivity().bindService(playIntent, musicConnection, Context.BIND_AUTO_CREATE); 
      getActivity().startService(playIntent); 
     } 
    } 
} 

这里是音乐服务类

public class MusicService extends Service implements 
    MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener, 
    MediaPlayer.OnCompletionListener { 

private MediaPlayer mPlayer; 
private Uri mSongUri; 

private ArrayList<ListModel> mListSongs; 
private int SONG_POS = 0; 

private final IBinder musicBind = new PlayerBinder(); 


private Notification.Builder notificationBuilder; 
private Notification mNotification; 

public class PlayerBinder extends Binder {//Service connection to play in background 

    public MusicService getService() { 
     Log.d("test", "getService()"); 
     return MusicService.this; 
    } 
} 

@Override 
public IBinder onBind(Intent intent) { 
    Log.d("test", "onBind Called "); 
    return musicBind; 
} 

Answer 1

我没有在 “AndroidManifest.xml中” 临时用户MusicService。所以我包括这条线，它开始工作。 “< service android：name =”。MusicService“/>” 我们需要在清单中注册服务..