【代码】android通过criteria选择合适的地理位置服务
16lz
2021-01-24
LocationActivity.java
/* 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
<?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。
更多相关文章
- C语言函数的递归(上)
- Android(安卓)-- ImageLoader简析
- Android(安卓)Camera 明细
- Android延迟执行 handler类的实现
- android MediaPlayer 简易播放器的实现 及类似斗地主音频池实现
- Android(安卓)bluetooth start discovery analyse
- setAnimationStyle实现的popwindow显示消失的动画效果
- Android(安卓)Audio AudioTrack::write函数
- Android(安卓)JVM的运行过程