Android方向传感器的使用方法

public static float[] getOrientation (float[] R, float[] values)

public static boolean getRotationMatrix (float[] R, float[] I, float[] gravity, float[] geomagnetic)

sensorManager.registerListener(this, acc_sensor, SensorManager.SENSOR_DELAY_GAME); 
sensorManager.registerListener(this, mag_sensor,SensorManager.SENSOR_DELAY_GAME); 

import android.app.Activity; 
import android.hardware.Sensor; 
import android.hardware.SensorEvent; 
import android.hardware.SensorEventListener; 
import android.hardware.SensorManager; 
import android.os.Bundle; 
import android.view.Menu; 
import android.widget.TextView; 
 
public class MainActivity extends Activity implements SensorEventListener{ 
 
  private SensorManager sensorManager; 
  private Sensor acc_sensor; 
  private Sensor mag_sensor; 
  //加速度传感器数据 
  float accValues[] = new float[3]; 
  //地磁传感器数据 
  float magValues[] = new float[3]; 
  //旋转矩阵，用来保存磁场和加速度的数据 
  float r[] = new float[9]; 
  //模拟方向传感器的数据（原始数据为弧度） 
  float values[] = new float[3]; 
  TextView showTV = null; 
  
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    show_change=(TextView) findViewById(R.id.show_change); 
    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    acc_sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
    mag_sensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); 
    // 注册监听： 
    sensorManager.registerListener(this, acc_sensor, SensorManager.SENSOR_DELAY_GAME); 
    sensorManager.registerListener(this, mag_sensor,SensorManager.SENSOR_DELAY_GAME); 
  } 
 
  @Override 
  public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
  }
   
  // 回调方法 
  @Override 
  public void onSensorChanged(SensorEvent event) { 
    if(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){ 
      accValues = event.values.clone();
    } 
    else if(event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD){ 
      magValues = event.values.clone();
    }
    
    /**
     * r：要填充的旋转数组 
     * I: 将磁场数据转换进实际的重力坐标中,一般默认情况下可以设置为null 
     * gravity: 加速度传感器数据 
     * geomagnetic：地磁传感器数据 
     */ 
    SensorManager.getRotationMatrix(r, null, accValues, magValues);
     
    /** 
     * R：旋转数组 
     * values：模拟方向传感器的数据 
     */ 
    SensorManager.getOrientation(r, values); 
     
    //将弧度转化为角度后输出 
    StringBuffer buff = new StringBuffer(); 
    for(float value : values){ 
      value=(float) Math.toDegrees(value); 
      buff.append(value + " "); 
    } 
    
    showTV.setText(buff.toString());   
  } 
   
  @Override 
  public void onAccuracyChanged(Sensor sensor, int accuracy) { 
  } 
}