USB充電提示音代碼實作

實作背景：

有的客戶需要在插入充電的時候需要提示音，于是實作了該功能。

實作方法：

代碼實作的路徑如下：

frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

導入 包名
import android.media.AudioManager;

import android.media.MediaPlayer;

定義資源位置
private static final String BATTERY_CHANGE = "/system/media/audio/ui/usb_effect.ogg";

private static final String POWER_DISCONNECTED = "/system/media/audio/ui/power_disconnected.ogg";

注冊廣播：
IntentFilter filter = new IntentFilter();

filter.addAction(Intent.ACTION_POWER_CONNECTED);

filter.addAction(Intent.ACTION_POWER_DISCONNECTED);

mContext.registerReceiver(mPowerConnectedReceiver, filter);

實作播放：
private final BroadcastReceiver mPowerConnectedReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

boolean enabled = Settings.Global.getInt(mContext.getContentResolver(),

Settings.Global.CHARGING_SOUNDS_ENABLED, 1) != 0;

  if (enabled) {

       String action = intent.getAction();
  }
  if (action.equals(Intent.ACTION_POWER_CONNECTED)) {

       playSound(BATTERY_CHANGE);
  } else if (action.equals(Intent.ACTION_POWER_DISCONNECTED)) {
       playSound(POWER_DISCONNECTED);
  }

 }

};

private void playSound(final String pathSound) {

    if (!mBootCompleted) {

      return;
    }

    new Thread() {

    public void run() {

        MediaPlayer mp = new MediaPlayer();

        try {

              mp.setDataSource(pathSound);

              mp.setAudioStreamType(AudioManager.STREAM_SYSTEM);

              mp.prepare();

              mp.start();

              Thread.sleep(mp.getDuration());

              mp.release();

            } catch (Exception e) {

              if (mp != null) {

                 mp.release();

              }

           }
       }

    }.start();

}