一、Android音频开发(一)：音频基础知识
二、Android音频开发(二)：录制音频(WAV及MP3格式)
三、Android音频开发(三)：使用ExoPlayer播放音频
四、Android音频开发(四)：音频播放模式
五、Android音频开发(五)：感应(息屏/亮屏)管理
附GitHub源码：MultimediaExplore
备注：ExoPlayer的解码是依赖Android系统提供的原生解码模块MediaCodec进行视频和音频解码的。关于ExoPlayer具体可参考：ExoPlayer
一、音频播放的权限及依赖：
音频播放可能涉及到的权限：
<uses-permission android:name="android.permission.INTERNET" />
<!--音频模式切换权限-->
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
<!--唤屏/息屏权限-->
<uses-permission android:name="android.Manifest.permission.DEVICE_POWER"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>音频播放器所需依赖：
// 多媒体播放器
implementation 'com.google.android.exoplayer:exoplayer-core:2.15.0'
implementation 'com.google.android.exoplayer:exoplayer-ui:2.15.0'
implementation 'com.google.android.exoplayer:exoplayer-hls:2.15.0'
implementation 'com.google.android.exoplayer:exoplayer-dash:2.15.0'
implementation 'com.google.android.exoplayer:exoplayer-transformer:2.15.0'
implementation 'com.google.android.exoplayer:exoplayer-rtsp:2.15.0'
implementation 'com.google.android.exoplayer:exoplayer-smoothstreaming:2.15.0'二、ExoPlayer实例生成：
生成SimpleExoPlayer实例，然后将build好的音频资源set到音频播放器即可进行播放。这里需要注意一点的是如果要获取音频的播放进度，需要生成一个如下图的handlerInner Handler实例，然后将其addEventListener中。否则如果直接使用从外部传过来的hander，所得到的音频播放进度会一直是0。
public void prepareAudioPlayer(Context context, Handler handler, Uri uri) {
if (player == null) {
player = new SimpleExoPlayer.Builder(context).build();
}
mediaSource = AudioMediaSourceManager.getInstance().buildMediaSource(uri, isLocalResource);
if (mediaSource == null || player == null) {
return;
}
if (handlerInner == null) {
handlerInner = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Message msgOuter = new Message();
if (msg.what == WHAT_POSITION) {
currentPosition = player.getCurrentPosition() / 1000;
contentPosition = player.getContentPosition() / 1000;
contentBufferedPosition = player.getContentBufferedPosition() / 1000;
Log.d(TAG, "-----> currentPosition:" + currentPosition + " contentPosition:" + contentPosition + " contentBufferedPosition:" + contentBufferedPosition);
HashMap<String, Long> hashMap = new HashMap<>();
hashMap.put("currentPosition", currentPosition);
hashMap.put("contentPosition", contentPosition);
hashMap.put("contentBufferedPosition", contentBufferedPosition);
msgOuter.what = WHAT_POSITION;
msgOuter.obj = hashMap;
handler.sendMessage(msgOuter);
if (currentPosition < duration) {
sendEmptyMessageDelayed(WHAT_POSITION, 300);
}
} else if (msg.what == WHAT_DURATION) {
msgOuter.obj = msg.obj;
handler.sendMessage(msgOuter);
}
}
};
}
mediaSource.addEventListener(handlerInner, new MediaSourceEventListener() {
@Override
public void onLoadStarted(int windowIndex, @Nullable MediaSource.MediaPeriodId mediaPeriodId, LoadEventInfo loadEventInfo, MediaLoadData mediaLoadData) {
Log.d(TAG, "onLoadStarted ---> duration:" + duration);
}
@Override
public void onLoadCompleted(int windowIndex, @Nullable MediaSource.MediaPeriodId mediaPeriodId, LoadEventInfo loadEventInfo, MediaLoadData mediaLoadData) {
mediaSource.removeEventListener(this);
//发送时长消息
duration = player.getDuration() / 1000;
Message msg = new Message();
msg.what = WHAT_DURATION;
msg.obj = duration;
handlerInner.sendMessage(msg);
//发送position消息
Message msgPos = new Message();
msgPos.what = WHAT_POSITION;
handlerInner.sendMessage(msgPos);
Log.d(TAG, "onLoadCompleted ---> duration:" + duration);
}
});
player.setMediaSource(mediaSource);
player.addListener(new Player.Listener() {
@Override
public void onPlayWhenReadyChanged(boolean playWhenReady, int reason) {
Log.d(TAG, "onPlayWhenReadyChanged---> playWhenReady:" + playWhenReady);
AudioPlayer.this.playWhenReady = playWhenReady;
}
@Override
public void onPlaybackStateChanged(int playbackState) {
Log.d(TAG, "onPlaybackStateChanged---> playbackState:" + playbackState);
switch (playbackState) {
case Player.STATE_READY:
Log.d(TAG, "STATE_READY");
break;
case Player.STATE_BUFFERING:
Log.d(TAG, "STATE_BUFFERING");
break;
case Player.STATE_ENDED:
Log.d(TAG, "STATE_ENDED");
audioStatus = AudioPlayStatus.AUDIO_STOP;
AudioModeManager.getInstance().abandonAudioFocus();
break;
case Player.STATE_IDLE:
Log.d(TAG, "STATE_IDLE");
audioStatus = AudioPlayStatus.AUDIO_IDLE;
AudioModeManager.getInstance().abandonAudioFocus();
break;
}
}
@Override
public void onIsPlayingChanged(boolean isPlaying) {
Log.d(TAG, "onIsPlayingChanged---> isPlaying:" + isPlaying);
if (isPlaying) {
audioStatus = AudioPlayStatus.AUDIO_START;
} else {
}
}
});
player.prepare();
}三、音频播放生命周期方法：
public void play() {
Log.d(TAG, "play");
if (player == null) {
return;
}
AudioModeManager.getInstance().requestAudioFocus();
if (playWhenReady) {
if (!player.isPlaying()) {
player.setPlayWhenReady(true);
}
} else {
player.prepare();
player.setPlayWhenReady(true);
}
audioStatus = AudioPlayStatus.AUDIO_START;
}
public void pause() {
Log.d(TAG, "pause");
if (player == null) {
return;
}
AudioModeManager.getInstance().abandonAudioFocus();
if (player.isPlaying()) {
player.pause();
}
audioStatus = AudioPlayStatus.AUDIO_PAUSE;
}
public void stop() {
Log.d(TAG, "stop");
if (player == null) {
return;
}
AudioModeManager.getInstance().abandonAudioFocus();
player.stop();
audioStatus = AudioPlayStatus.AUDIO_STOP;
}
public void cancel() {
Log.d(TAG, "cancel");
}
public void release() {
Log.d(TAG, "release");
if (player == null) {
return;
}
AudioModeManager.getInstance().abandonAudioFocus();
player.release();
if (handlerInner != null) {
handlerInner.removeCallbacksAndMessages(null);
}
audioStatus = AudioPlayStatus.AUDIO_RELEASE;
}四、音频播放管理AudioPlayManager：
类似AudioRecordManager的作用，音频播放器全局单例，代码略。