预览系统铃音时来电，两个铃音同时响

最新推荐文章于 2021-06-02 22:48:05 发布

原创最新推荐文章于 2021-06-02 22:48:05 发布 · 394 阅读

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CC 4.0 BY-SA版权

本文详细介绍了Android系统中RingtonePickerActivity类如何管理音频焦点，包括请求、监听和释放音频焦点的过程，以及在不同音频焦点变化时对铃声播放的控制策略。

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src/com/android/providers/media/RingtonePickerActivity.java

//added start
private AudioManager mAudioManager = null;
private boolean mGetFocus = false;
//added end

setupAlert();
mAudioManager=(AudioManager)getSystemService(Context.AUDIO_SERVICE);//added

if (ringtone.getUri() != null) ringtone.play();
//added start
int result=mAudioManager.requestAudioFocus(mAudioFocusListener,
AudioManager.STREAM_RING, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
mGetFocus = false;
} else {
mGetFocus = true;
}
//added end

if (mRingtoneManager != null) {
mRingtoneManager.stopPreviousRingtone();
}

//added start
if (mGetFocus && (null != mAudioManager)) {
if (AudioManager.AUDIOFOCUS_REQUEST_GRANTED == mAudioManager.abandonAudioFocus(mAudioFocusListener)) {
mGetFocus = false;
} else {
mGetFocus = true;
}
}
//added end

//added start
private OnAudioFocusChangeListener mAudioFocusListener = new OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_LOSS:
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
stopAnyPlayingRingtone();
break;
}
}
};
//added end