Android Battery Information BroadcastReceiver

public class MainActivity extends Activity {
    private static final String TAG = "TestBatteryInfo";
    private TextView batteryInfo;
    private ImageView imageBatteryState;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        batteryInfo = (TextView) findViewById(R.id.textViewBatteryInfo);
        imageBatteryState = (ImageView) findViewById(R.id.imageViewBatteryState);

        IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(batteryInfoReceiver, filter);
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(batteryInfoReceiver);
    }

    private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d(TAG, "Get Battery Broadcast: " + intent.toString());
            Toast.makeText(MainActivity.this,
                    "Get Battery Broadcast: " + intent.toString(),
                    Toast.LENGTH_SHORT).show();
            int health = intent.getIntExtra(BatteryManager.EXTRA_HEALTH, 0);
            int icon_small = intent.getIntExtra(
                    BatteryManager.EXTRA_ICON_SMALL, 0);
            int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
            int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
            boolean present = intent.getExtras().getBoolean(
                    BatteryManager.EXTRA_PRESENT);
            int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 0);
            int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, 0);
            String technology = intent.getExtras().getString(
                    BatteryManager.EXTRA_TECHNOLOGY);
            int temperature = intent.getIntExtra(
                    BatteryManager.EXTRA_TEMPERATURE, 0);
            int voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, 0);

            batteryInfo.setText("Health: " + health + "\n" + "Icon Small:"
                    + icon_small + "\n" + "Level: " + level + "\n"
                    + "Plugged: " + plugged + "\n" + "Present: " + present
                    + "\n" + "Scale: " + scale + "\n" + "Status: " + status
                    + "\n" + "Technology: " + technology + "\n"
                    + "Temperature: " + temperature + "\n" + "Voltage: "
                    + voltage + "\n");
            imageBatteryState.setImageResource(icon_small);
        }
    };
}