问在Android上关闭屏幕时，以编程方式关闭屏幕

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public class SensorActivity extends Activity implements SensorEventListener {
private SensorManager mSensorManager;
private Sensor mProximity;

 @Override
 public final void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

// Get an instance of the sensor service, and use that to get an instance of
// a particular sensor.
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
 }

 @Override
 public final void onAccuracyChanged(Sensor sensor, int accuracy) {
// Do something here if sensor accuracy changes.
 }

 @Override
  public final void onSensorChanged(SensorEvent event) {
   float distance = event.values[0];
// Do something with this sensor data.
   }

 @Override
 protected void onResume() {
// Register a listener for the sensor.
super.onResume();
mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL);
 }

 @Override
  protected void onPause() {
// Be sure to unregister the sensor when the activity pauses.
super.onPause();
mSensorManager.unregisterListener(this);
 }}