接近傳感器 (Proximity Sensor)

通過接近傳感器 (Proximity Sensor)可以檢測到 Android 手機靠近我的臉, 進而做一些動作, 例如禁用觸摸功能，或關閉屏幕.

public class AndroidProximitySensorActivity extends Activity {
  /** Called when the activity is first created. */
 
 SensorManager mySensorManager;
 Sensor myProximitySensor;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
  myProximitySensor = mySensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
  
  if (myProximitySensor == null){
   //No Proximity Sensor!
   
  }else{
   mySensorManager.registerListener(proximitySensorEventListener, myProximitySensor,SensorManager.SENSOR_DELAY_NORMAL);
  }
 }
 
 SensorEventListener proximitySensorEventListener = new SensorEventListener(){
  
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
   // TODO Auto-generated method stub
   
  }
  
  @Override
  public void onSensorChanged(SensorEvent event) {
   // TODO Auto-generated method stub
   
   if(event.sensor.getType()==Sensor.TYPE_PROXIMITY){
    //do something
   }
  }
 };
}