android播放器音量控制-使用震动示例代码-进度条控制音量

在写程序的时候我们会使用到声音通知下面代码就是实现该行为：

setVolumeControlStream(AudioManager.STREAM_MUSIC);
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
// mediaPlayer.setOnCompletionListener(beepListener);
AssetFileDescriptor file = getResources().openRawResourceFd(R.raw.beep);
try {
mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(),
file.getLength());
file.close();
mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
mediaPlayer.prepare();
} catch (IOException e) {
mediaPlayer = null;
}
mediaPlayer.start();

下面代码是使用系统的震动：

/提示
vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
long[] pattern = {800, 50, 400, 30}; // OFF/ON/OFF/ON...
vibrator.vibrate(pattern, 2);//-1不重复，非-1为从pattern的指定下标开始重复

关于系统的音量的问题有以下参数：

136 /** The audio stream for system sounds */
137 public static final int STREAM_SYSTEM = AudioSystem.STREAM_SYSTEM;
138 /** The audio stream for the phone ring */
139 public static final int STREAM_RING = AudioSystem.STREAM_RING;
140 /** The audio stream for music playback */
141 public static final int STREAM_MUSIC = AudioSystem.STREAM_MUSIC;

如果想使用进度框来调节的话有下面代码：

MediaPlayer mp = MediaPlayer.create(context, R.raw.recv);
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
int maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
mp.setVolume(maxVolume * mLastProgress / 10 , maxVolume * mLastProgress / 10 );

AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, maxVolume * mLastProgress / 10 , 0 );

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