【移動應用開發(fā)技術】如何在Android中通過網(wǎng)絡獲取定位

【移動應用開發(fā)技術】如何在Android中通過網(wǎng)絡獲取定位

如何在Android中通過網(wǎng)絡獲取定位？相信很多沒有經(jīng)驗的人對此束手無策，為此本文總結了問題出現(xiàn)的原因和解決方法，通過這篇文章希望你能解決這個問題。1.activity_main.xml頁面定義TextView顯示城市名。activity_main.xml頁面：<RelativeLayout

xmlns:android="/apk/res/android"

xmlns:tools="/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頁面，設置公共常量。Common.java頁面：package

mon;

/**

*

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頁面作為服務進行定位。LocationSvc.java頁面：package

com.sc.demo.locate;

import

mon.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;

/**

*

定位服務

*

@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,

"無法定位",

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，這里就移除監(jiān)聽，停掉服務。如果要進行實時定位，可以在退出應用或者其他時刻停掉定位服務。

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頁面獲取經(jīng)緯度，然后根據(jù)經(jīng)緯度獲取城市名。MainActivity.java頁面：package

com.sc.demo;

import

java.io.IOException;

import

java.util.List;

import

mon.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);

//

注冊廣播

IntentFilter

filter

=

new

IntentFilter();

filter.addAction(Common.LOCATION_ACTION);

this.registerReceiver(new

LocationBroadcastReceiver(),

filter);

//

啟動服務

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

//截取經(jīng)緯度轉換為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);//

不需要時注銷

}

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頁面添加權限并聲明服務。AndroidManifest.xml頁面：<?xml

version="1.0"

encoding="utf-8"?>

<manifest

xmlns:android="/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