解决铃声和音乐同时播放的问题（通过获取和释放音频焦点来完成）

在目录packages/providers/MediaProvider/src/com/android/providers/media/RingtonePickerActivity.java中添加修改

import android.media.AudioManager
import android.content.Contxt;
import android.media.AudioManager.OnAudioFocusChangeListener;

private AudioManager mAudioManager=null;
private boolean mGetFocus=false;
private OnAudioFocusChangeListener mAudioFocusListener=new OnAudioFocusChangeListener(){
public void onAudioFocusChange(int focusChange){
Log.d(TAG,"onAudioFocusChange:"+focusChange);
switch(focusChange){
case AudioManager.AUDIOFOCUS_LOSS:
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
stopAnyPlayingRingtone();
break;
}
}
};

在onCreate中添加

mAudioManager=(AudioManager)getSystemService(Context.AUDIO_SERVICE);

在run方法中添加

if(ringtone!=null){
int result=mAudioManager.requestAudioFocus(mAudioFocusListener,AudioManager.STREAM_RING,AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
if(result!=AudioManager.AUDIOFOCUS_REQUEST_GRANTED){
Log.d(TAG,"<abandonAudioFocus()> abandon audio focus success");
mGetFocus=false;
}else{
Log.d(TAG,"<abandonAudioFocus()> abandon audio focus failed");
mGetFocus=true;
}
if(mAudioManager.getMode()==AudioManager.MODE_RINGTONE){
return;
}
}

在onPause中添加

if(mGetFocus && (null!=mAudioManager)){
if(AudioManager.AUDIOFOCUS_REQUEST_GRANTED==mAudioManager.abandonAudioFocus(mAudioFocusListener)){
Log.d(TAG,"request audio focus fail");
mGetFocus=false;
}else{
Log.d(TAG,"request audio focus success);
mGetFocus=true;
}
}

参考链接 http://blog.csdn.net/sundayzhong/article/details/52128226 http://blog.csdn.net/shuaicike/article/details/39930823