Android实现原生锁屏页面音乐控制

package com.yobbom.jiheboxplayer.service;
import android.os.Build;
import android.support.v4.media.MediaMetadataCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;
import com.yobbom.jiheboxplayer.model.Music;
/**
* Created by Administrator on 2019/4/3.
*/
public class MediaSessionManager {
private static final String TAG = "MediaSessionManager";
private static final long MEDIA_SESSION_ACTIONS = PlaybackStateCompat.ACTION_PLAY
| PlaybackStateCompat.ACTION_PAUSE
| PlaybackStateCompat.ACTION_PLAY_PAUSE
| PlaybackStateCompat.ACTION_SKIP_TO_NEXT
| PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS
| PlaybackStateCompat.ACTION_STOP
| PlaybackStateCompat.ACTION_SEEK_TO;
private PlayService playService;
private MediaSessionCompat mediaSession;
public static MediaSessionManager get(){
return SingletonHolder.instance;
}
private static class SingletonHolder{
private static MediaSessionManager instance = new MediaSessionManager();
}
private MediaSessionManager(){
}
//音乐的控制逻辑都在PlayService服务中，将service实例传递过来，与MediaSessionManager进行交互
private void init(PlayService playService){
this.playService = playService;
setupMediaSession();
}
private void setupMediaSession(){
mediaSession = new MediaSessionCompat(playService, TAG);
//指明支持的按键信息类型
mediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS | MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS);
mediaSession.setCallback(callback);//设置监听回调
mediaSession.setActive(true);//必须设置为true，这样才能开始接收各种信息
}
//点击控制按钮时，更新播放状态
public void updatePlaybackState(){
int state = (AudioPlayer.get().isPlaying() || AudioPlayer.get().isPreparing()) ? PlaybackStateCompat.STATE_PLAYING : PlaybackStateCompat.STATE_PAUSED;
//第三个参数必须为1，否则锁屏上面显示的时长会有问题
mediaSession.setPlaybackState(
//监听的事件（播放，暂停，上一曲，下一曲）
new PlaybackStateCompat.Builder()
.setActions(MEDIA_SESSION_ACTIONS)
.setState(state, AudioPlayer.get().getAudioPosition(), 1)
.build());
}
//播放歌曲时，需要更新屏幕上的歌曲信息
public void updateMetaData(Music music){
if(music == null){
mediaSession.setMetadata(null);
return;
}
//Log.d(TAG, "parseMp3File名称: " + mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_TITLE));
//Log.d(TAG, "parseMp3File专辑: " + mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
//Log.d(TAG, "parseMp3File歌手: " + mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST));
//Log.d(TAG, "parseMp3File码率: " + mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_BITRATE));
//Log.d(TAG, "parseMp3File时长: " + mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
//Log.d(TAG, "parseMp3File类型: " + mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_MIMETYPE));
MediaMetadataCompat.Builder metaData = new MediaMetadataCompat.Builder()
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, music.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, music.getArtist())
.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, music.getAlbum())
.putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ARTIST, music.getArtist())
.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, music.getDuration())
.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, CoverLoader.get().loadThumb(music));
if(Build.VERSION.SDK_INT  = Build.VERSION_CODES.LOLLIPOP){
metaData.putLong(MediaMetadataCompat.METADATA_KEY_NUM_TRACKS, AppCache.get().getLocalMusicList().size());
}
mediaSession.setMetadata(metaData.build());
}
//初始化回调，用于监听锁屏界面上的按钮事件
private MediaSessionCompat.Callback callback = new MediaSessionCompat.Callback() {
@Override
public void onPlay() {
AudioPlayer.get().playPause();
}
@Override
public void onPause() {
AudioPlayer.get().playPause();
}
@Override
public void onSkipToNext() {
AudioPlayer.get().next();
}
@Override
public void onSkipToPrevious() {
AudioPlayer.get().prev();
}
@Override
public void onStop() {
AudioPlayer.get().stopPlayer();
}
@Override
public void onSeekTo(long pos) {
AudioPlayer.get().seekTo((int)pos);
}
};
}