android传感器Gsensor和Psensor的使用举例

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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;    @Overridepublic 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() {@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {}@Overridepublic void onSensorChanged(SensorEvent event) {if(event.values[Z_ORATIATION] < CRITICAL_ANGLE){//screen upif(!pSensorOpened){pSensorOpened = true;mProximityWakeLock.acquire();//open PSensor function}} else if(pSensorOpened){//screen downpSensorOpened = false;mProximityWakeLock.release();//close PSensor function}}         };                       mSensorManager.registerListener(mGsensorListener, mGsensor, SensorManager.SENSOR_DELAY_GAME);}    @Overridepublic 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{@Overridepublic 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>