Android 使用 ToneGenerator 编写按键发声功能
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; } } }}?