RemoteControlClient的使用

来源：互联网发布：网络兼职宣传语编辑：程序博客网时间：2024/06/06 02:04

RemoteControlClient是从API 14也就是android 4.0开始出现的类，用于在锁屏状态控制音乐播放。界面是系统提供的。

api doc文档上附了一段注册代码

ComponentName myEventReceiver = new ComponentName(getPackageName(), MyRemoteControlEventReceiver.class.getName()); AudioManager myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); myAudioManager.registerMediaButtonEventReceiver(myEventReceiver); // build the PendingIntent for the remote control client Intent mediaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON); mediaButtonIntent.setComponent(myEventReceiver); PendingIntent mediaPendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, mediaButtonIntent, 0); // create and register the remote control client RemoteControlClient myRemoteControlClient = new RemoteControlClient(mediaPendingIntent); myAudioManager.registerRemoteControlClient(myRemoteControlClient);

上面的代码开始时注册了耳机按键的事件，接着注册了RemoteControlClient。

要想弄出RemoteControlClient的界面，上面的代码还不够，还需要把当前音乐状态设置为正在播放

mClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING)

并且必须获取当前的stream focus

am.requestAudioFocus(new OnAudioFocusChangeListener() {@Overridepublic void onAudioFocusChange(int focusChange) {System.out.println("focusChange = " + focusChange);}}, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

这样，在锁屏状态系统界面就能出现了，默认只有一个播放暂停按钮。要想显示额外的信息，使用editMetadata(boolean startEmpty)去put，如果想多显示几个控制按钮，如下：

        int flags = RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS                | RemoteControlClient.FLAG_KEY_MEDIA_NEXT                | RemoteControlClient.FLAG_KEY_MEDIA_PLAY                | RemoteControlClient.FLAG_KEY_MEDIA_PAUSE                | RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE                | RemoteControlClient.FLAG_KEY_MEDIA_STOP;        mClient.setTransportControlFlags(flags);

所有按键的响应事件都在注册的receiver中。

0 0