如何在Android中通过网络获取定位?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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; @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); } @Override public 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(); } @Override public boolean stopService(Intent name) { return super.stopService(name); } @Override public void onLocationChanged(Location location) { //通知Activity Intent 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(); } @Override public void onProviderDisabled(String provider) { } @Override public void onProviderEnabled(String provider) { } @Override public 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; @Override protected 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 { @Override public 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>
看完上述内容,你们掌握如何在Android中通过网络获取定位的方法了吗?如果还想学到更多技能或想了解更多相关内容,欢迎关注亿速云行业资讯频道,感谢各位的阅读!
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