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）

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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