android传感器Gsensor和Psensor的使用举例

今天leader给的任务是这样的，做一个开机自启动的后台Service，实现对重力及距离的检测

当手机屏幕朝下时，让Psensor可用。否则不可用

实现代码如下：

SensorFunctionService.java

package com.sensor.demo;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.IBinder;
import android.os.PowerManager;

public class SensorFunctionService extends Service {   	

	private static final String LOG_TAG = "SensorDemoActivity";
	private static final int PROXIMITY_SCREEN_WAKE_LOCK = 32;
	private static final float CRITICAL_ANGLE = -5.0f;
	private static final int Z_ORATIATION = 2;
	
	private SensorManager mSensorManager;
	private Sensor mGsensor;
	private SensorEventListener mGsensorListener;
	private PowerManager pm;
	private PowerManager.WakeLock mProximityWakeLock;
	private boolean pSensorOpened;

    @Override
	public void onCreate() {
		super.onCreate();
		pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

        mProximityWakeLock = 
        		pm.newWakeLock(PROXIMITY_SCREEN_WAKE_LOCK, LOG_TAG);
        
        mSensorManager= (SensorManager) getSystemService(SENSOR_SERVICE);   
        mGsensor = mSensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);  
        mGsensorListener = new SensorEventListener() {

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

			@Override
			public void onSensorChanged(SensorEvent event) {
				if(event.values[Z_ORATIATION] < CRITICAL_ANGLE){	//screen up
					if(!pSensorOpened){
						pSensorOpened = true;
						mProximityWakeLock.acquire();	//open PSensor function
					}
				} else if(pSensorOpened){							//screen down
					pSensorOpened = false;
					mProximityWakeLock.release();	//close PSensor function
				}
			}  
       };  
               
      mSensorManager.registerListener(mGsensorListener, mGsensor, SensorManager.SENSOR_DELAY_GAME);
	}
    
	@Override
	public IBinder onBind(Intent arg0) {
		return null;
	}
}

BootCompletedReceiver.java

package com.sensor.demo;
import com.sensor.demo.SensorFunctionService;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;


public class BootCompletedReceiver extends BroadcastReceiver{

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
        Intent mIntent = new Intent(context, SensorFunctionService.class);
        context.startService(mIntent);
	}
}

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sensor.demo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />
	<uses-permission android:name="android.permission.WAKE_LOCK" /> 
	<uses-permission android:name="android.permission.DEVICE_POWER" />  
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />  
	
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        
        <service android:name=".SensorFunctionService"></service>   
        
        <receiver android:name=".BootCompletedReceiver">  
            <intent-filter>  
                <action android:name="android.intent.action.BOOT_COMPLETED" />  
            </intent-filter>  
        </receiver>  
    </application>
	
</manifest>

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