安卓方向传感器Sensor.TYPE_ORIENTATION废弃之后获得方向信息

浏览数：22 / 时间：2015年06月11日

安卓方向传感器Sensor.TYPE_ORIENTATION已经在安卓中不推荐使用了，用getOrientation来代替，用这个却不像以前那样一下就可以拿到数据，需要同时使用地磁传感器和加速度传感器来获取，代码如下：

package com.catcher.testcompass;

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.widget.TextView;

public class FourActivity extends Activity {
    private TextView tv;
    private SensorManager manager;
    private MySensorEventListener listener;
    private Sensor magneticSensor, accelerometerSensor;
    private float[] values, r, gravity, geomagnetic;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_four);
        tv = (TextView) findViewById(R.id.tv);
        //获取SensorManager
        manager = (SensorManager) getSystemService(SENSOR_SERVICE);
        listener = new MySensorEventListener();
        //获取Sensor
        magneticSensor = manager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        accelerometerSensor = manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        //初始化数组
        values = new float[3];//用来保存最终的结果
        gravity = new float[3];//用来保存加速度传感器的值
        r = new float[9];//
        geomagnetic = new float[3];//用来保存地磁传感器的值
    }

    private class MySensorEventListener implements SensorEventListener {

        @Override
        public void onSensorChanged(SensorEvent event) {
            if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
                geomagnetic = event.values;
            }
            if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
                gravity = event.values;
                getValue();
            }
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
            
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        manager.registerListener(listener, magneticSensor, SensorManager.SENSOR_DELAY_NORMAL);
        manager.registerListener(listener, accelerometerSensor, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
        manager.unregisterListener(listener);
        super.onPause();
    }

    public void getValue() {
        // r从这里返回
        SensorManager.getRotationMatrix(r, null, gravity, geomagnetic);
        //values从这里返回
        SensorManager.getOrientation(r, values);
        //提取数据
        double azimuth = Math.toDegrees(values[0]);
        if (azimuth<0) {
            azimuth=azimuth+360;
        }
        double pitch = Math.toDegrees(values[1]);
        double roll = Math.toDegrees(values[2]);
        tv.invalidate();
        tv.setText("Azimuth：" + (int)azimuth + "\nPitch：" + (int)pitch + "\nRoll：" + (int)roll);
    }
}

布局文件只有一个TextView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.catcher.testcompass.MainActivity" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:text="@string/hello_world" />

</RelativeLayout>