ANDROID_MARS学习笔记_S05_005_方向传感器

 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 mOrientation;

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

         mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
         mOrientation = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
       }

       @Override
       public void onAccuracyChanged(Sensor sensor, int accuracy) {
         // Do something here if sensor accuracy changes.
         // You must implement this callback in your code.
       }

       @Override
       protected void onResume() {
         super.onResume();
         mSensorManager.registerListener(this, mOrientation, SensorManager.SENSOR_DELAY_NORMAL);
       }

       @Override
       protected void onPause() {
         super.onPause();
         mSensorManager.unregisterListener(this);
       }

       @Override
       public void onSensorChanged(SensorEvent event) {
         float azimuth_angle = event.values[0];
         float pitch_angle = event.values[1];
         float roll_angle = event.values[2];

         System.out.println("azimuth--->" + azimuth_angle);
         System.out.println("pitch_angle--->" + pitch_angle);
         System.out.println("roll_angle--->" + roll_angle);
         // Do something with these orientation angles.
       }
 }