Android中的感应器

在别人那里看到这个，就随便保存下来，不知道啥时候遇到能用的时候呢

package com.softeem.android;

import java.util.List;     

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;     
import android.widget.TextView;     
     
public class HelloSensor extends Activity {     
    Sensor sensor ;     
    private float x, y, z;     
    /** Called when the activity is first created. */     
    @Override     
    public void onCreate(Bundle savedInstanceState) {     
        super.onCreate(savedInstanceState);     
        setContentView(R.layout.main);     
     
        //准备显示信息的UI组建     
        final TextView tx1 = (TextView) findViewById(R.id.TextView01);     
     
        //从系统服务中获得传感器管理器     
        SensorManager sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);     
     
        //从传感器管理器中获得全部的传感器列表     
        List<Sensor> allSensors = sm.getSensorList(Sensor.TYPE_ALL);     
     
        //显示有多少个传感器     
        tx1.setText("经检测该手机有" + allSensors.size() + "个传感器，他们分别是：\n");     
     
        //显示每个传感器的具体信息     
        for (Sensor s : allSensors) {     
     
            String tempString = "\n" + "  设备名称：" + s.getName() + "\n" + "  设备版本：" + s.getVersion() + "\n" + "  供应商："     
                    + s.getVendor() + "\n";     
     
            switch (s.getType()) {     
            case Sensor.TYPE_ACCELEROMETER:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 加速度传感器accelerometer" + tempString);     
                break;     
//            case Sensor.TYPE_GRAVITY:     
//                tx1.setText(tx1.getText().toString() + s.getType() + " 重力传感器gravity API 9" + tempString);     
//                break;     
            case Sensor.TYPE_GYROSCOPE:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 陀螺仪传感器gyroscope" + tempString);     
                break;     
            case Sensor.TYPE_LIGHT:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 环境光线传感器light" + tempString);     
                break;     
//            case Sensor.TYPE_LINEAR_ACCELERATION:     
//                tx1.setText(tx1.getText().toString() + s.getType() + " 线性加速器LINEAR_ACCELERATION API 9" + tempString);     
//                break;     
            case Sensor.TYPE_MAGNETIC_FIELD:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 电磁场传感器magnetic field" + tempString);     
                break;     
            case Sensor.TYPE_ORIENTATION:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 方向传感器orientation" + tempString);     
                break;     
            case Sensor.TYPE_PRESSURE:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 压力传感器pressure" + tempString);     
                break;     
            case Sensor.TYPE_PROXIMITY:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 距离传感器proximity" + tempString);     
                break;     
//            case Sensor.TYPE_ROTATION_VECTOR:     
//                tx1.setText(tx1.getText().toString() + s.getType() + " 旋转向量ROTATION" + tempString);     
//                break;     
            case Sensor.TYPE_TEMPERATURE:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 温度传感器temperature" + tempString);     
                break;     
            default:     
                tx1.setText(tx1.getText().toString() + s.getType() + " 未知传感器" + tempString);     
                break;     
            }     
        }     
              
        //在title上显示重力传感器的变化     
        sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);     
        SensorEventListener lsn = new SensorEventListener() {     
            public void onSensorChanged(SensorEvent e) {     
                x = e.values[SensorManager.DATA_X];     
                y = e.values[SensorManager.DATA_Y];     
                z = e.values[SensorManager.DATA_Z];     
                setTitle("x=" + (int) x + "," + "y=" + (int) y + "," + "z="+ (int) z);     
            }     
     
            public void onAccuracyChanged(Sensor s, int accuracy) {
            }     
        };     
        // 注册listener，第三个参数是检测的精确度     
        sm.registerListener(lsn, sensor, SensorManager.SENSOR_DELAY_GAME);     
     
    }     
}