本文实例讲述了android使用criteria选择合适的地理位置服务实现方法。分享给大家供大家参考,具体如下:
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/* locationactivity.java * @author octobershiner * 2011 7 24 * se.hit * 利用criteria选择最优的位置服务,演示定位用户的位置并且监听位置变化的代码 * */ package uni.location; import android.app.activity; import android.content.context; import android.location.criteria; import android.location.location; import android.location.locationlistener; import android.location.locationmanager; import android.os.bundle; import android.os.vibrator; import android.util.log; import android.widget.textview; public class locationactivity extends activity { /** called when the activity is first created. */ //创建lcoationmanager对象 private locationmanager manager; private static final string tag = "location demo" ; @override public void oncreate(bundle savedinstancestate) { super .oncreate(savedinstancestate); setcontentview(r.layout.main); //获取系统的服务, manager = (locationmanager)getsystemservice(context.location_service); //创建一个criteria对象 criteria criteria = new criteria(); criteria.setaccuracy(criteria.accuracy_coarse); //设置不需要获取海拔方向数据 criteria.setaltituderequired( false ); criteria.setbearingrequired( false ); //设置允许产生资费 criteria.setcostallowed( true ); //要求低耗电 criteria.setpowerrequirement(criteria.power_low); string provider = manager.getbestprovider(criteria, false ); log.i(tag, "we choose " + provider); location location = manager.getlastknownlocation(provider); //第一次获得设备的位置 updatelocation(location); //重要函数,监听数据测试 manager.requestlocationupdates(provider, 6000 , 10 , locationlistener); } //创建一个事件监听器 private final locationlistener locationlistener = new locationlistener() { public void onlocationchanged(location location) { updatelocation(location); } public void onproviderdisabled(string provider){ updatelocation( null ); log.i(tag, "provider now is disabled.." ); } public void onproviderenabled(string provider){ log.i(tag, "provider now is enabled.." ); } public void onstatuschanged(string provider, int status,bundle extras){ } }; //获取用户位置的函数,利用log显示 private void updatelocation(location location) { string latlng; if (location != null ) { double lat = location.getlatitude(); double lng = location.getlongitude(); latlng = "latitude:" + lat + " longitude:" + lng; } else { latlng = "can't access your location" ; } log.i(tag, "the location has changed.." ); log.i(tag, "your location:" +latlng); } } |
同时修改manifest.xml文件:
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<?xml version= "1.0" encoding= "utf-8" ?> <manifest xmlns:android= "http://schemas.android.com/apk/res/android" package = "uni.location" android:versioncode= "1" android:versionname= "1.0" > <uses-sdk android:minsdkversion= "8" /> <application android:icon= "@drawable/icon" android:label= "@string/app_name" > <activity android:name= ".locationactivity" android:label= "@string/app_name" > <intent-filter> <action android:name= "android.intent.action.main" /> <category android:name= "android.intent.category.launcher" /> </intent-filter> </activity> </application> <uses-permission android:name= "android.permission.access_fine_location" /> </manifest> |
演示结果:
可任看到 我们只要求低的精确度并且最低电量,从最后一行可以看到我的虚拟机网络服务并没有打开,但是选择最佳provider的时候,参数选择了false 所以同样可以选择。
希望本文所述对大家android程序设计有所帮助。