android 连接usb包括充电

public class StatusUsbActivity extends Activity {

private SoundPool soundPool;

private int times=0;

private final static String ACTION = "android.intent.action.BATTERY_CHANGED";

private boolean connected=false;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

IntentFilter mIntentFilter = new IntentFilter(); 

mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED); 

registerReceiver(BtStatusReceiver, mIntentFilter);

soundPool= new SoundPool(10,AudioManager.STREAM_SYSTEM,5);

soundPool.load(this,R.raw.aejat,1);

}

public BroadcastReceiver BtStatusReceiver = new BroadcastReceiver() 

{

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (action.equals(ACTION)) {

int num = intent.getIntExtra("plugged", 0);

if (num==1||num==2) {

connected=true;

} else if (num == 0) {

connected=false;

}

if(times==0&&connected)

{

soundPool.play(1, 1, 1, 0, 0, 2);

times=1;

}else if((times == 1) && !connected){

soundPool.play(1, 1, 1, 0, 0, 2);

times = 0; 

}else{

return; // // 插入后面的多次调用，直接返回。

}

}

}

};