Android - Battery 잔량 표시

private TextView contentTxt;

public void onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

        LinearLayout layout = new LinearLayout(this);

        layout.setOrientation(LinearLayout.VERTICAL);

        

        contentTxt = new TextView(this);

                

        setContentView(layout);

        layout.addView(contentTxt);

        

      this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

    }

    private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){

@Override

public void onReceive(Context arg0, Intent intent) {

// TODO Auto-generated method stub

int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
  int ratio = (level * 100) / scale;

contentTxt.setText(String.valueOf(ratio) + "%");

}

};