利用MediaSession发送信息到蓝牙音箱

1.利用MediaSession发送信息到蓝牙音箱，如：播放音乐时接收的歌曲信息，但是每一首歌连续播放时，再次发送的重复信息会被丢弃。则利用MediaSession发现信息时，要保证信息的不重复性。

2. 

    public  MediaSessionCompat mMediaSession;
    private  Handler sHandler;
	
	  
    public  void initMediaSession(){

        mMediaSession = new MediaSessionCompat(this, "MusicService");
        sHandler = new Handler(Looper.getMainLooper());
        mMediaSession.setCallback(new MediaSessionCompat.Callback() {
            @Override
            public boolean onMediaButtonEvent(Intent intent) {
                android.support.v4.media.session.MediaButtonReceiver mMediaButtonReceiver = new android.support.v4.media.session.MediaButtonReceiver();
                mMediaButtonReceiver.onReceive(SettingActivity.this, intent);
                return true;
            }
        }, sHandler);
        mMediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
                MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
        Context context = getApplicationContext();
        Intent intent = new Intent(context, HomeActivity.class);
        PendingIntent pi = PendingIntent.getActivity(context, 99 /*request code*/,
                intent, PendingIntent.FLAG_UPDATE_CURRENT);
        mMediaSession.setSessionActivity(pi);
        if (!mMediaSession.isActive()) {
            mMediaSession.setActive(true);
        }
    }

3. 注册的Receiver

 <receiver android:name="android.support.v4.media.session.MediaButtonReceiver">
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_BUTTON" />
            </intent-filter>
   </receiver>

4.

	
		if(mMediaSession==null){
                        initMediaSession();
                    }
                    MediaMetadataCompat.Builder md = new MediaMetadataCompat.Builder();
                    md.putString(MediaMetadataCompat.METADATA_KEY_TITLE, "#Wifi#" + UUID.randomUUID().toString());
                    wifiName="NETGEAR84";wifiPwd="aaaaaaaa@";
                    md.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, wifiName);
                    md.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, wifiPwd);
                    md.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, 100);
                    mMediaSession.setMetadata(md.build());

                    mMediaSession.setCallback(null);
                    mMediaSession.setActive(false);
                    mMediaSession.release();
                    mMediaSession=null;

5.