Sensor（ORIENTATION）

package com.example.sensor01;

import java.util.List;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity implements SensorEventListener{

    private SensorManager mSensorManager;
    private TextView textview;
    private float[] mags;
    private float[] accs;
    private float[] oris;
    private float[] rotate;

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

        textview = (TextView) findViewById(R.id.content);

        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        //Sensor.TYPE_ORIENTATION 在新版本中已经放弃
        Sensor magsensor  = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        Sensor accsensor  = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

        mSensorManager.registerListener(this, magsensor, SensorManager.SENSOR_DELAY_FASTEST);
        mSensorManager.registerListener(this, accsensor, SensorManager.SENSOR_DELAY_FASTEST);

        mags = new float[3];
        accs = new float[3];
        oris = new float[3];
        rotate = new float[9];
    }

    @Override
    public void onAccuracyChanged(Sensor arg0, int arg1) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onSensorChanged(SensorEvent event) {

        if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD){
            mags = event.values;//x轴地磁强度
        }

        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
            accs = event.values;//x轴地磁强度
        }

        mSensorManager.getRotationMatrix(rotate, null, accs, mags);
        mSensorManager.getOrientation(rotate, oris);
        /*oris[0]      :azimuth 方向角，但用（磁场+加速度）得到的数据范围是（-180～180）,也就是说，0表示正北，90表示正东，180/-180表示正南，-90表示正西。
        oris[1]      :pitch 倾斜角  即由静止状态开始，围绕X轴前后翻转
        oris[2]      :roll 旋转角 即由静止状态开始，围绕Y轴左右翻转*/
        double azimuth = Math.toDegrees(oris[0]);
        if (azimuth<0) {
            azimuth=azimuth + 360;
        }
        double pitch = Math.toDegrees(oris[1]);
        double roll = Math.toDegrees(oris[2]);

        textview.setText(String.valueOf(azimuth) + "   "
        + String.valueOf(pitch) + "  " + String.valueOf(roll));
    }
}