Android音频焦点处理服务
16lz
2021-01-26
1. 服务代码：
package com.rmicro.audiofocus;import java.io.IOException;import android.app.Service;import android.content.Intent;import android.media.AudioManager;import android.media.AudioManager.OnAudioFocusChangeListener;import android.media.MediaPlayer.OnPreparedListener;import android.media.MediaPlayer;import android.os.Bundle;import android.os.IBinder;import android.os.PowerManager;import android.util.Log;public class MusicService extends Service { private AudioManager mAm; private boolean isPlaymusic; private String url; private MediaPlayer mediaPlayer; private static final int AUDIO_STREAM_TYPE = AudioManager.STREAM_MUSIC; private static final int REQUEST_AUDIO_FOCUS_TYPE = AudioManager.AUDIOFOCUS_GAIN; private int mAudioStatus = AUDIO_STATUS_IDLE; public static final int AUDIO_STATUS_IDLE = 0; public static final int AUDIO_STATUS_INITIALIZED = 1; public static final int AUDIO_STATUS_PREPARING = 2; public static final int AUDIO_STATUS_PREPARED = 3; public static final int AUDIO_STATUS_STARTED = 4; public static final int AUDIO_STATUS_PAUSED = 5; public static final int AUDIO_STATUS_PLAYBACKCOMPLETED = 6; public static final int AUDIO_STATUS_STOPED = 7;private static final String TAG = "leo"; @Override public void onCreate() { super.onCreate(); mAm = (AudioManager) getSystemService(AUDIO_SERVICE); } @Overridepublic int onStartCommand(Intent intent, int flags, int startId) {// TODO Auto-generated method stub if (intent != null) { Bundle bundle = intent.getExtras(); if (bundle != null) { isPlaymusic = bundle.getBoolean("isPlay", true); url = bundle.getString("url"); if (isPlaymusic) { playAudio(); } else { stopAudio();// pauseAudio(); } } }return super.onStartCommand(intent, flags, startId);} OnAudioFocusChangeListener afChangeListener = new OnAudioFocusChangeListener() { public void onAudioFocusChange(int focusChange) { Log.i(TAG, "onAudioFocusChange..."); dump(); if (focusChange == AudioManager.AUDIOFOCUS_GAIN) { // 获得音频焦点 // Resume playback startAudio(); } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) { // 长久的失去音频焦点，释放MediaPlayer mAm.abandonAudioFocus(afChangeListener); // Stop playback stopAudio(); } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT) { // 暂时失去音频焦点，暂停播放等待重新获得音频焦点 // Pause playback pauseAudio(); } else if(focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK) { // 失去音频焦点，无需停止播放，降低声音即可也可以暂停播放。// lowerAudioVolume(); pauseAudio(); } } };private boolean requestFocus() {// Request audio focus for playbackint result = mAm.requestAudioFocus(afChangeListener,// Use the music stream.AUDIO_STREAM_TYPE,// Request permanent focus.REQUEST_AUDIO_FOCUS_TYPE);Log.i("leo", "result="+result);return result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;} private void lowerAudioVolume() { Log.i(TAG, "lowerAudioVolume..."); dump(); if(mAudioStatus == AUDIO_STATUS_STARTED) { if (mediaPlayer != null) { mediaPlayer.setVolume(0.1f, 0.1f); } } } MediaPlayer.OnCompletionListener completionListener = new MediaPlayer.OnCompletionListener() { @Override public void onCompletion(MediaPlayer player) { if(!player.isLooping()){ mAm.abandonAudioFocus(afChangeListener); mAudioStatus = AUDIO_STATUS_PLAYBACKCOMPLETED; } } }; private void playAudio() { Log.i(TAG, "playAudio..."); dump(); if (requestFocus()) { if (mAudioStatus == AUDIO_STATUS_IDLE) { Log.i("leo", "url="+url); mediaPlayer = new MediaPlayer();// mediaPlayer.reset();// mAudioStatus = AUDIO_STATUS_IDLE; // 设置音频流的类型 mediaPlayer.setAudioStreamType(AUDIO_STREAM_TYPE); // 设置播放完成监听 mediaPlayer.setOnCompletionListener(completionListener); //设定CUP锁定 mediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK); try {mediaPlayer.setDataSource(url);} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();Log.i(TAG, "set data source error");} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} mAudioStatus = AUDIO_STATUS_INITIALIZED; // 设置文件装载监听 mediaPlayer.setOnPreparedListener(new OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { // 装载完毕 开始播放流媒体 mAudioStatus = AUDIO_STATUS_PREPARED; startAudio(); } }); } if(mAudioStatus == AUDIO_STATUS_INITIALIZED || mAudioStatus == AUDIO_STATUS_STOPED ) { //通过同步的方式装载媒体资源//mediaPlayer.prepare(); //mAudioStatus = AUDIO_STATUS_PREPARED;// 通过异步的方式装载媒体资源mediaPlayer.prepareAsync();mAudioStatus = AUDIO_STATUS_PREPARING; } startAudio(); } } @Override public void onDestroy() { super.onDestroy(); releaseAudio(); } @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; } private void dump() { Log.i(TAG, "current audio status is = "+audioStatusToString()); } private String audioStatusToString() { switch(mAudioStatus) { case AUDIO_STATUS_IDLE: return "audio_idle"; case AUDIO_STATUS_INITIALIZED: return "audio_initialized"; case AUDIO_STATUS_PREPARING: return "audio_preparing"; case AUDIO_STATUS_PREPARED: return "audio_prepared"; case AUDIO_STATUS_STARTED: return "audio_started"; case AUDIO_STATUS_PAUSED: return "audio_paused"; case AUDIO_STATUS_PLAYBACKCOMPLETED: return "audio_playbackcompleted"; case AUDIO_STATUS_STOPED: return "audio_stoped"; } return "audio_null"; } private void startAudio() { Log.i(TAG, "startAudio..."); dump(); if(mAudioStatus == AUDIO_STATUS_PAUSED || mAudioStatus == AUDIO_STATUS_PREPARED || mAudioStatus == AUDIO_STATUS_PLAYBACKCOMPLETED) { if (mediaPlayer != null) { mediaPlayer.start(); mAudioStatus = AUDIO_STATUS_STARTED; // 还原音量 mediaPlayer.setVolume(1.0f, 1.0f); } } } private void pauseAudio() { Log.i(TAG, "pauseAudio..."); dump(); if(mAudioStatus == AUDIO_STATUS_STARTED) { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); mAudioStatus = AUDIO_STATUS_PAUSED; } } else { Log.i("leo", "resumeAudio error, current audio status = "+mAudioStatus); } } private void stopAudio() { Log.i(TAG, "stopAudio..."); dump(); if(mAudioStatus == AUDIO_STATUS_PREPARED || mAudioStatus == AUDIO_STATUS_STARTED|| mAudioStatus == AUDIO_STATUS_PAUSED|| mAudioStatus == AUDIO_STATUS_PLAYBACKCOMPLETED ) { if (mediaPlayer != null) { mediaPlayer.stop(); mAudioStatus = AUDIO_STATUS_STOPED; } } } private void releaseAudio() { Log.i(TAG, "releaseAudio..."); dump(); mAm.abandonAudioFocus(afChangeListener); if (mediaPlayer != null) { mediaPlayer.release(); mAudioStatus = AUDIO_STATUS_IDLE; mediaPlayer = null; } } }2. AndroidManifest.xml配置
添加服务
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