Android 使用 ToneGenerator 编写按键发声功能

核心提示：Java代码private ToneGenerator mToneGenerator;private Object mToneGeneratorLock = new Object();//监视器对象锁private boolean mDTMFToneEnabled; //按键操作音private static fina

Java代码

private ToneGenerator mToneGenerator;

private Object mToneGeneratorLock = new Object();//监视器对象锁

private boolean mDTMFToneEnabled; //按键操作音

private static final int TONE_LENGTH_MS = 150;//延迟时间

void playTone(int tone) {

// TODO 播放按键声音

if (!mDTMFToneEnabled) {

return;

}

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

int ringerMode = audioManager.getRingerMode();

if ((ringerMode == AudioManager.RINGER_MODE_SILENT)

|| (ringerMode == AudioManager.RINGER_MODE_VIBRATE)) {//静音或震动时不发出按键声音

return;

}

synchronized(mToneGeneratorLock) {

if (mToneGenerator == null) {

Log.w(TAG, "playTone: mToneGenerator == null, tone: "+tone);

return;

}

mToneGenerator.startTone(tone, TONE_LENGTH_MS);//发声

}

}

protected void onResume(){

super.onResume();

mDTMFToneEnabled = Settings.System.getInt(getContentResolver(),

Settings.System.DTMF_TONE_WHEN_DIALING, 1) == 1;//获取系统参数“按键操作音”是否开启

synchronized(mToneGeneratorLock) {

if (mToneGenerator == null) {

try {

mToneGenerator = new ToneGenerator(AudioManager.STREAM_MUSIC, 80);

setVolumeControlStream(AudioManager.STREAM_MUSIC);

} catch (RuntimeException e) {

Log.w(TAG, "Exception caught while creating local tone generator: " + e);

mToneGenerator = null;

}

}

}

}