ANDROID_MARS学习笔记_S05_006_距离传感器

 import android.app.Activity;
 import android.content.Context;
 import android.hardware.Sensor;
 import android.hardware.SensorEvent;
 import android.hardware.SensorEventListener;
 import android.hardware.SensorManager;
 import android.os.Bundle;

 public class MainActivity 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];
         System.out.println("distance--->" + distance);
         System.out.println(mProximity.getMaximumRange());
         // 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);
       }

 }