测试android手机是否支持某种感应器

package com.gogler.ui;
import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;

public class AndroidUIActivity extends Activity {
 /** Called when the activity is first created. */

 private SensorManager sms;
 private CheckBox gravity,light,orientation;
 private Button check;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  /*获取UI小组件*/
  gravity = (CheckBox) this.findViewById(R.id.gravity);
  light = (CheckBox) this.findViewById(R.id.light);
  orientation = (CheckBox) this.findViewById(R.id.orientation);
  check=(Button) this.findViewById(R.id.check);
  
  /*获取系统的传感器管理服务*/
  sms = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
  
  check.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    /*查询是否本机是否提供某种感应器能力*/
    if(sms.getDefaultSensor(Sensor.TYPE_ORIENTATION) != null)
     orientation.setChecked(true);
    if(sms.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null)
     gravity.setChecked(true);
    if(sms.getDefaultSensor(Sensor.TYPE_LIGHT) != null)
     light.setChecked(true);
   }
   
  });  
 
 }
}