Android-使用网络获取定位

目标效果：

 

程序运行弹出权限选择，选择运行网络定位后会查询位置，然后在TextView上显示当前国家和城市。

1.activity_main.xml页面定义TextView显示城市名。

activity_main.xml页面：

<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=".MainActivity" >    <TextView        android:id="@+id/text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="正在定位。。。" /></RelativeLayout>

2.新建Common.java页面，设置公共常量。

Common.java页面：

package com.sc.demo.common;/** * 公共常量 * @author wxy * */public class Common {public static final String LOCATION = "location";public static final String LOCATION_ACTION = "locationAction";}

3.新建LocationSvc.java页面作为服务进行定位。

LocationSvc.java页面：

package com.sc.demo.locate;import com.sc.demo.common.Common;import android.app.Service;import android.content.Intent;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.os.IBinder;import android.util.Log;import android.widget.Toast;/** * 定位服务 * @author wxy * */public class LocationSvc extends Service implements LocationListener {private LocationManager locationManager;@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);}@Overridepublic void onStart(Intent intent, int startId) {if (locationManager.getProvider(LocationManager.NETWORK_PROVIDER) != null) locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,this);else if (locationManager.getProvider(LocationManager.GPS_PROVIDER) != null) locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,this);else Toast.makeText(this, "无法定位", Toast.LENGTH_SHORT).show();}@Overridepublic boolean stopService(Intent name) {return super.stopService(name);}@Overridepublic void onLocationChanged(Location location) {//通知ActivityIntent intent = new Intent();intent.setAction(Common.LOCATION_ACTION);intent.putExtra(Common.LOCATION, location.toString());sendBroadcast(intent);// 如果只是需要定位一次，这里就移除监听，停掉服务。如果要进行实时定位，可以在退出应用或者其他时刻停掉定位服务。locationManager.removeUpdates(this);stopSelf();}@Overridepublic void onProviderDisabled(String provider) {}@Overridepublic void onProviderEnabled(String provider) {}@Overridepublic void onStatusChanged(String provider, int status, Bundle extras) {}}

4.MainActivity.java页面获取经纬度，然后根据经纬度获取城市名。

MainActivity.java页面：

package com.sc.demo;import java.io.IOException;import java.util.List;import com.sc.demo.common.Common;import com.sc.demo.locate.LocationSvc;import android.location.Address;import android.location.Geocoder;import android.os.Bundle;import android.util.Log;import android.widget.TextView;import android.app.Activity;import android.app.ProgressDialog;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;public class MainActivity extends Activity {private TextView text;private ProgressDialog dialog;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);text = (TextView) findViewById(R.id.text);// 注册广播IntentFilter filter = new IntentFilter();filter.addAction(Common.LOCATION_ACTION);this.registerReceiver(new LocationBroadcastReceiver(), filter);// 启动服务Intent intent = new Intent();intent.setClass(this, LocationSvc.class);startService(intent);// 等待提示dialog = new ProgressDialog(this);dialog.setMessage("正在定位...");dialog.setCancelable(true);dialog.show();}private class LocationBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {if (!intent.getAction().equals(Common.LOCATION_ACTION))return;String locationInfo = intent.getStringExtra(Common.LOCATION);double latitude = Double                                  //截取经纬度转换为double型.parseDouble(locationInfo.substring(17, 26));double longitude = Double.parseDouble(locationInfo.substring(27, 37));text.setText(getaddress(latitude, longitude));dialog.dismiss();MainActivity.this.unregisterReceiver(this);// 不需要时注销}public String getaddress(double latitude, double longitude) {String cityName = "";List<Address> addList = null;Geocoder ge = new Geocoder(MainActivity.this);try {addList = ge.getFromLocation(latitude, longitude, 1);} catch (IOException e) {e.printStackTrace();}if (addList != null && addList.size() > 0) {for (int i = 0; i < addList.size(); i++) {Address ad = addList.get(i);cityName += ad.getCountryName() + ";" + ad.getLocality();}}Log.i("wxy", "city:" + cityName);return cityName;}}}

5.AndroidManifest.xml页面添加权限并声明服务。

AndroidManifest.xml页面：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.sc.demo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.sc.demo.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <service android:name=".locate.LocationSvc" />    </application></manifest>

6.运行就能显示目标效果了。