android - 通知中的媒体播放器控件

Question

我已经编写了完整的音乐播放器来从网络流式传输音乐，但我不知道如何将媒体播放器控件放入通知中以及何时锁定屏幕。

我关注 this tutorial为了在通知栏中显示控件，但仍然没有得到如何在我的程序中使用相同的功能，我已经导入了所需的类，例如:NotificationService.java 和 Constants.java。

这是我在通知栏中得到的:

[ ]

我很困惑。为什么我没有得到我正在播放的歌曲的标题，为什么暂停、上一个和下一个按钮不起作用等等...

NotificationService.java:

public class NotificationService extends Service {

    Notification status;
    private final String LOG_TAG = "NotificationService";

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        if (intent.getAction().equals(Constants.ACTION.STARTFOREGROUND_ACTION)) {
            showNotification();
            Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();  
        } else if (intent.getAction().equals(Constants.ACTION.PREV_ACTION)) {
            Toast.makeText(this, "Clicked Previous", Toast.LENGTH_SHORT).show();
            Log.i(LOG_TAG, "Clicked Previous");
        } else if (intent.getAction().equals(Constants.ACTION.PLAY_ACTION)) {
            Toast.makeText(this, "Clicked Play", Toast.LENGTH_SHORT).show();
            Log.i(LOG_TAG, "Clicked Play");
        } else if (intent.getAction().equals(Constants.ACTION.NEXT_ACTION)) {
            Toast.makeText(this, "Clicked Next", Toast.LENGTH_SHORT).show();
            Log.i(LOG_TAG, "Clicked Next");
        } else if (intent.getAction().equals(Constants.ACTION.STOPFOREGROUND_ACTION)) {
            Log.i(LOG_TAG, "Received Stop Foreground Intent");
            Toast.makeText(this, "Service Stoped", Toast.LENGTH_SHORT).show();
            stopForeground(true);
            stopSelf();
        }
        return START_STICKY;
    }

    private void showNotification() {
        // Using RemoteViews to bind custom layouts into Notification
        RemoteViews views = new RemoteViews(getPackageName(), R.layout.status_bar);
        RemoteViews bigViews = new RemoteViews(getPackageName(), R.layout.status_bar_expanded);

        // showing default album image
        views.setViewVisibility(R.id.status_bar_icon, View.VISIBLE);
        views.setViewVisibility(R.id.status_bar_album_art, View.GONE);
        bigViews.setImageViewBitmap(R.id.status_bar_album_art,
        Constants.getDefaultAlbumArt(this));
        Intent notificationIntent = new Intent(this, MusicPlayerActivity.class);
        notificationIntent.setAction(Constants.ACTION.MAIN_ACTION);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
        | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
        Intent previousIntent = new Intent(this, NotificationService.class);
        previousIntent.setAction(Constants.ACTION.PREV_ACTION);
        PendingIntent ppreviousIntent = PendingIntent.getService(this, 0, previousIntent, 0);
        Intent playIntent = new Intent(this, NotificationService.class);
        playIntent.setAction(Constants.ACTION.PLAY_ACTION);
        PendingIntent pplayIntent = PendingIntent.getService(this, 0, playIntent, 0); 
        Intent nextIntent = new Intent(this, NotificationService.class);
        nextIntent.setAction(Constants.ACTION.NEXT_ACTION);
        PendingIntent pnextIntent = PendingIntent.getService(this, 0, nextIntent, 0); 
        Intent closeIntent = new Intent(this, NotificationService.class);
        closeIntent.setAction(Constants.ACTION.STOPFOREGROUND_ACTION);
        PendingIntent pcloseIntent = PendingIntent.getService(this, 0, closeIntent, 0);
        views.setOnClickPendingIntent(R.id.status_bar_play, pplayIntent);
        bigViews.setOnClickPendingIntent(R.id.status_bar_play, pplayIntent);
        views.setOnClickPendingIntent(R.id.status_bar_next, pnextIntent);
        bigViews.setOnClickPendingIntent(R.id.status_bar_next, pnextIntent);
        views.setOnClickPendingIntent(R.id.status_bar_prev, ppreviousIntent);
        bigViews.setOnClickPendingIntent(R.id.status_bar_prev, ppreviousIntent);
        views.setOnClickPendingIntent(R.id.status_bar_collapse, pcloseIntent);
        bigViews.setOnClickPendingIntent(R.id.status_bar_collapse, pcloseIntent);
        views.setImageViewResource(R.id.status_bar_play,
        R.drawable.apollo_holo_dark_pause);
        bigViews.setImageViewResource(R.id.status_bar_play,
        R.drawable.apollo_holo_dark_pause);
        views.setTextViewText(R.id.status_bar_track_name, "Song Title");
        bigViews.setTextViewText(R.id.status_bar_track_name, "Song Title");
        views.setTextViewText(R.id.status_bar_artist_name, "Artist Name");
        bigViews.setTextViewText(R.id.status_bar_artist_name, "Artist Name");
        bigViews.setTextViewText(R.id.status_bar_album_name, "Album Name");
        status = new Notification.Builder(this).build();
        status.contentView = views;
        status.bigContentView = bigViews;
        status.flags = Notification.FLAG_ONGOING_EVENT;
        status.icon = R.drawable.ic_launcher;
        status.contentIntent = pendingIntent;
        startForeground(Constants.NOTIFICATION_ID.FOREGROUND_SERVICE, status);
        }   

}

Constants.java:

public class Constants {
    public interface ACTION {
        public static String MAIN_ACTION = "com.marothiatechs.customnotification.action.main";
        public static String INIT_ACTION = "com.marothiatechs.customnotification.action.init";
        public static String PREV_ACTION = "com.marothiatechs.customnotification.action.prev";
        public static String PLAY_ACTION = "com.marothiatechs.customnotification.action.play";
        public static String NEXT_ACTION = "com.marothiatechs.customnotification.action.next";
        public static String STARTFOREGROUND_ACTION = "com.marothiatechs.customnotification.action.startforeground";
        public static String STOPFOREGROUND_ACTION = "com.marothiatechs.customnotification.action.stopforeground";

    }

    public interface NOTIFICATION_ID {
        public static int FOREGROUND_SERVICE = 101;
    }

    public static Bitmap getDefaultAlbumArt(Context context) {
        Bitmap bm = null;
        BitmapFactory.Options options = new BitmapFactory.Options();
        try {
            bm = BitmapFactory.decodeResource(context.getResources(),
            R.drawable.default_album_art, options);
        } catch (Error ee) {
        } catch (Exception e) {
        }
    return bm;
    }
}

MusicPlayerActivity.java:

public class MusicPlayerActivity extends Activity {

// ....

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music_player);
        mediaPlayer = new MediaPlayer();
        audiosArrayList = new ArrayList<MusicPlayer>();
        listview = (ListView) findViewById(R.id.list_slidermenu);

    // ...

        btnPlay.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View view) {
                try {
                    play();                    
                } catch (Exception exception){
                    Log.v("exception:play", exception.toString());
                }

            }
        });

        btnPause.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View view) {
                try {
                    pause();
                } catch (Exception exception){
                    Log.v("exception:pause", exception.toString());
                }

            }
        });

        btnNext.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View view) {
                try {
                    next();
                } catch (Exception exception){
                    Log.v("exception:next", exception.toString());
                }

            }
        });

        btnPrev.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View view) { 
                try {
                    prev();
                } catch (Exception exception){
                    Log.v("exception:pause", exception.toString());
                }
            }
        });
        new JSONAsyncTask().execute("http://myurl/json/musics.json");
        listview.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {

            if (mediaPlayer != null && mediaPlayer.isPlaying())
                try {
                    mediaPlayer.stop();
                } catch (Exception e) {

                }
            play();
        }
    });

    ......

    }

    // ...

    public void startService(View v) {
        Intent serviceIntent = new Intent(MusicPlayerActivity.this, NotificationService.class);
        serviceIntent.setAction(Constants.ACTION.STARTFOREGROUND_ACTION);
        startService(serviceIntent);
    }

Answer 1

尝试这样的事情(我使用整数作为操作):

intent.putExtra("action", ACTION_EXIT);
pendingIntent = PendingIntent.getService(this, intent.getIntExtra("action", 0), intent, PendingIntent.FLAG_UPDATE_CURRENT);

在公共(public)静态 PendingIntent getService 中(上下文上下文，int requestCode，Intent Intent ，int 标志) requestCode 必须是唯一的。