取得Android平台某设备上所有可用的Sensors

本来要写一个检测手机的温度的小应用，学习一下传感器的api,可结果怎么写不行。经检测，发现取得的Sensor为NULL，这才明白，我手机没有TYPE_AMBIENT_TEMPERATURE传感器。

于是写了一个APP列出所有的可用的Sensors。

(附编译后的APK: http://pan.baidu.com/s/1kToTpTt)

代码如下：

 package kempff.sensors;

 import java.util.List;

 import android.app.Activity;
 import android.hardware.Sensor;
 import android.hardware.SensorManager;
 import android.os.Bundle;
 import android.widget.TextView;

 public class MainActivity extends Activity {
     private String mtext="";
     private TextView tv=null;
     private SensorManager sm=null;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         tv=(TextView)findViewById(R.id.msg);
         sm=(SensorManager)this.getSystemService(SENSOR_SERVICE);
         List<Sensor> sensors=sm.getSensorList(Sensor.TYPE_ALL);
         for(Sensor t:sensors){
             log("[Sensors]Name:"+t.getName()+";Vendor:"+t.getVendor());
         }
     }

     private void log(String s){
         mtext+=s+"\n";
         tv.setText(mtext);
     }
 }

编译后在手机上安装，输出结果果然没有AMBIENT_TEMPERATURE。在我手机上有个测温软件竟能检测温度，可能是用的CPU温度之类的方法，还没有弄明白。附上另一段利用温度传感器测温度的代码。

 package kempff.t001;

 import android.os.Bundle;
 import android.widget.TextView;
 import android.app.Activity;
 import android.hardware.*;

 public class MainActivity extends Activity implements SensorEventListener {
     private Sensor mtmp=null;
     private SensorManager msm=null;
     private TextView msg=null;
     private String mtext="";

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         msg=(TextView)findViewById(R.id.msg);
         msm=(SensorManager)this.getSystemService(SENSOR_SERVICE);
         mtmp=msm.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);
         if(mtmp==null){
             log("TYPE_AMBIENT_TEMPERATURE==NULL");
         }else{
             log("TYPE_AMBIENT_TEMPERATURE:"+mtmp.toString());
         }
     }

     @Override
     protected void onPause() {
         // TODO Auto-generated method stub
         super.onPause();
         msm.unregisterListener(this);
     }

     @Override
     protected void onResume() {
         // TODO Auto-generated method stub
         super.onResume();
         msm.registerListener(this, mtmp, SensorManager.SENSOR_DELAY_NORMAL);
     }

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

     }

     @Override
     public void onSensorChanged(SensorEvent event) {
         // TODO Auto-generated method stub
         for(float t:event.values){
             log(String.valueOf(t)+"\n");
         }
     }

     private void log(String txt){
         mtext+=txt;
         this.msg.setText(mtext);
     }
 }

这是Layout.xml

 <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"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="kempff.t001.MainActivity" >

     <TextView
         android:id="@+id/msg"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:text="@string/hello_world" />

 </RelativeLayout>