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);
      }

    
}