Android MediaPlayer的封装
2019-06-24 本文已影响0人
一个冬季
注意
本文封装是在android音视频指南-MediaPlayer概述上进行的2次开发。二次封装完成后,我提供了正在播放、暂停播放、重置、播放完成、媒体流装载完成、媒体流加载中、异常错误等的状态返回
业务需求
需要对音乐媒体类进行播放,如果需要播放的音乐本地缓存没有,需要先下载,然后加载音乐。如果有本地缓存的音乐,直接从本地缓存里面读取,然后加载最后播放
使用说明
1、你需要在自己的Activity或者Fragment去 implements PlaybackInfoListener 接口
MediaPlayerHolder mediaPlayerIngHolder = new MediaPlayerHolder();
mediaPlayerIngHolder.setmPlaybackInfoListener(this);//设置监听
2、如果是要加载网络音乐(我建议先下载下来),或者是本地音乐,需要调用
mediaPlayerIngHolder.loadMedia(path);//加载音乐,不是属于播放的状态
mediaPlayerIngHolder.play();//开始播放,注意:需要等到onStateChanged == PLAYSTATUS4才可以调用这个方法
3、如果不需要播放了,需要释放资源
mediaPlayerIngHolder.release();
mediaPlayerIngHolder = null;
接口回调说明
void onDurationChanged(int duration);//返回音乐的总时长
void onPositionChanged(int position);//当播放的进度
void onStateChanged(int state);//记录当前的状态
void onPlaybackCompleted();//播放完成回调
学习总结
1、每次调用mediaPlayerIngHolder.loadMedia方法,都需要 mMediaPlayer.reset(),这样是防止再次添加进来出现崩溃信息
2、为了避免阻塞主线程,预加载音乐需要使用mMediaPlayer.prepareAsync();预加载完成才可以使用mMediaPlayer.start();播放音乐
代码展示
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:播放回调
**/
public interface PlaybackInfoListener {
void onDurationChanged(int duration);//总时长
void onPositionChanged(int position);//当前时长进度
void onStateChanged(int state);//记录当前的状态
void onPlaybackCompleted();//播放完成回调
}
public interface PlayerAdapterListener {
void loadMedia(String musiUrl);//加载媒体资源
void release();//释放资源
boolean isPlaying();//判断是否在播放
void play();//开始播放
void reset();//重置
void pause();//暂停
void medisaPreparedCompled();//完成媒体流的装载
void seekTo(int position);//滑动到某个位置
}
public class MediaPlayerHolder implements PlayerAdapterListener{
public static int PLAYSTATUS0=0;//正在播放
public static int PLAYSTATUS1=1;//暂停播放
public static int PLAYSTATUS2=2;//重置
public static int PLAYSTATUS3=3;//播放完成
public static int PLAYSTATUS4=4;//媒体流装载完成
public static int PLAYSTATUS5=5;//媒体流加载中
public static int PLAYSTATUSD1=-1;//错误
public int PLAYBACK_POSITION_REFRESH_INTERVAL_MS = 1000;
private String TAG = MediaPlayerHolder.class.getSimpleName();
private MediaPlayer mMediaPlayer;
private ScheduledExecutorService mExecutor;//开启线程
private PlaybackInfoListener mPlaybackInfoListener;
private Runnable mSeekbarPositionUpdateTask;
private String musiUrl;//音乐地址,可以是本地的音乐,可以是网络的音乐
public void setmPlaybackInfoListener(PlaybackInfoListener mPlaybackInfoListener) {
this.mPlaybackInfoListener = mPlaybackInfoListener;
}
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:初始化MediaPlayer
**/
private void initializeMediaPlayer(){
if (mMediaPlayer == null) {
mMediaPlayer = new MediaPlayer();
//注册,播放完成后的监听
mMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
stopUpdatingCallbackWithPosition(true);
if (mPlaybackInfoListener != null) {
mPlaybackInfoListener.onStateChanged(PLAYSTATUS3);
mPlaybackInfoListener.onPlaybackCompleted();
}
}
});
//监听媒体流是否装载完成
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
medisaPreparedCompled();
}
});
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:监听媒体错误信息
**/
mMediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
if (mPlaybackInfoListener!=null){
mPlaybackInfoListener.onStateChanged(PLAYSTATUSD1);
}
Log.d(TAG, "OnError - Error code: " + what + " Extra code: " + extra);
switch (what) {
case -1004:
Log.d(TAG, "MEDIA_ERROR_IO");
break;
case -1007:
Log.d(TAG, "MEDIA_ERROR_MALFORMED");
break;
case 200:
Log.d(TAG, "MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK");
break;
case 100:
Log.d(TAG, "MEDIA_ERROR_SERVER_DIED");
break;
case -110:
Log.d(TAG, "MEDIA_ERROR_TIMED_OUT");
break;
case 1:
Log.d(TAG, "MEDIA_ERROR_UNKNOWN");
break;
case -1010:
Log.d(TAG, "MEDIA_ERROR_UNSUPPORTED");
break;
}
switch (extra) {
case 800:
Log.d(TAG, "MEDIA_INFO_BAD_INTERLEAVING");
break;
case 702:
Log.d(TAG, "MEDIA_INFO_BUFFERING_END");
break;
case 701:
Log.d(TAG, "MEDIA_INFO_METADATA_UPDATE");
break;
case 802:
Log.d(TAG, "MEDIA_INFO_METADATA_UPDATE");
break;
case 801:
Log.d(TAG, "MEDIA_INFO_NOT_SEEKABLE");
break;
case 1:
Log.d(TAG, "MEDIA_INFO_UNKNOWN");
break;
case 3:
Log.d(TAG, "MEDIA_INFO_VIDEO_RENDERING_START");
break;
case 700:
Log.d(TAG, "MEDIA_INFO_VIDEO_TRACK_LAGGING");
break;
}
return false;
}
});
}
}
/**
* @date: 2019/6/24 0024
* @author: gaoxiaoxiong
* @description: 加载媒体资源
**/
@Override
public void loadMedia(String musiUrl) {
if (StringUtils.getInstance().isEmpty(musiUrl)){
Log.i(TAG,"地址为空");
return;
}
if (mPlaybackInfoListener!=null){
mPlaybackInfoListener.onStateChanged(PLAYSTATUS5);
}
this.musiUrl = musiUrl;
initializeMediaPlayer();
try {
mMediaPlayer.reset();//防止再次添加进来出现崩溃信息
mMediaPlayer.setDataSource(musiUrl);
mMediaPlayer.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @date: 2019/6/24 0024
* @author: gaoxiaoxiong
* @description:释放媒体资源
**/
@Override
public void release() {
if (mMediaPlayer != null) {
stopUpdatingCallbackWithPosition(false);
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
/**
* @date: 2019/6/24 0024
* @author: gaoxiaoxiong
* @description:判断是否正在播放
**/
@Override
public boolean isPlaying() {
if (mMediaPlayer != null) {
return mMediaPlayer.isPlaying();
}
return false;
}
/**
* @date: 2019/6/24 0024
* @author: gaoxiaoxiong
* @description:播放开始
**/
@Override
public void play() {
if (mMediaPlayer != null && !mMediaPlayer.isPlaying()) {
mMediaPlayer.start();
if (mPlaybackInfoListener != null) {
mPlaybackInfoListener.onStateChanged(PLAYSTATUS0);
}
startUpdatingCallbackWithPosition();
}
}
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:开启线程,获取当前播放的进度
**/
private void startUpdatingCallbackWithPosition() {
if (mExecutor == null) {
mExecutor = Executors.newSingleThreadScheduledExecutor();
}
if (mSeekbarPositionUpdateTask == null) {
mSeekbarPositionUpdateTask = new Runnable() {
@Override
public void run() {
updateProgressCallbackTask();
}
};
}
mExecutor.scheduleAtFixedRate(
mSeekbarPositionUpdateTask,
0,
PLAYBACK_POSITION_REFRESH_INTERVAL_MS,
TimeUnit.MILLISECONDS
);
}
@Override
public void reset() {
if (mMediaPlayer != null) {
loadMedia(musiUrl);
if (mPlaybackInfoListener != null) {
mPlaybackInfoListener.onStateChanged(PLAYSTATUS2);
}
stopUpdatingCallbackWithPosition(true);
}
}
/**
* @date: 2019/6/24 0024
* @author: gaoxiaoxiong
* @description:暂停
**/
@Override
public void pause() {
if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
if (mPlaybackInfoListener != null) {
mPlaybackInfoListener.onStateChanged(PLAYSTATUS1);
}
}
}
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:更新当前的进度
**/
private void updateProgressCallbackTask() {
if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
int currentPosition = mMediaPlayer.getCurrentPosition();
if (mPlaybackInfoListener != null) {
mPlaybackInfoListener.onPositionChanged(currentPosition);
}
}
}
/**
* @date: 2019/6/24 0024
* @author: gaoxiaoxiong
* @description:加载完成回调
**/
@Override
public void medisaPreparedCompled() {
int duration = mMediaPlayer.getDuration();//获取总时长
if (mPlaybackInfoListener != null) {
mPlaybackInfoListener.onDurationChanged(duration);
mPlaybackInfoListener.onPositionChanged(0);
mPlaybackInfoListener.onStateChanged(PLAYSTATUS4);
}
}
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:滑动播放到某个位置
**/
@Override
public void seekTo(int position) {
if (mMediaPlayer != null) {
mMediaPlayer.seekTo(position);
}
}
/**
* @date: 2019/6/21 0021
* @author: gaoxiaoxiong
* @description:播放完成回调监听
**/
private void stopUpdatingCallbackWithPosition(boolean resetUIPlaybackPosition) {
if (mExecutor != null) {
mExecutor.shutdownNow();
mExecutor = null;
mSeekbarPositionUpdateTask = null;
if (resetUIPlaybackPosition && mPlaybackInfoListener != null) {
mPlaybackInfoListener.onPositionChanged(0);
}
}
}
}