本文主要是介绍获取andrid apn信息（转），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
本文转自 http://www.cnmsdn.com/html/201008/1282371656ID7414_2.html
由于Android对于APN的网络API没有公开，不过我们可以阅读源代码，然后进行数据库操作，系统会自动监听数据库的变化，从而实现开启或者关闭APN。
大家可以研究一下frameworks/base/core/java/android/provider/Telephony.java这个类，
比较重要的就是 URI 和数据库字段： content://telephony/carriers
字段可以在Telephony.java中找到。
其实原理很简单 ：
1 、 当开启APN的时候，设置一个正确的移动或者联通的APN
2、 关闭的时候设置一个错误APN就会自动关闭网络
请看代码：Activity：
package com.yuan;import java.util.ArrayList;
import java.util.List;import com.yuan.util.APNMatchTools;import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;public class ApnTest extends Activity {/** Called when the activity is first created. */Uri uri = Uri.parse("content://telephony/carriers");public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Button open= (Button) findViewById(R.id.open);Button close= (Button) findViewById(R.id.close);open.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {openAPN();}});close.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {closeAPN();}});}public void openAPN(){List<APN> list = getAPNList();for (APN apn : list) {ContentValues cv = new ContentValues();cv.put("apn", APNMatchTools.matchAPN(apn.apn));cv.put("type", APNMatchTools.matchAPN(apn.type));getContentResolver().update(uri, cv, "_id=?", new String[]{apn.id});}}public void closeAPN(){List<APN> list = getAPNList();for (APN apn : list) {ContentValues cv = new ContentValues();cv.put("apn", APNMatchTools.matchAPN(apn.apn)+"mdev");cv.put("type", APNMatchTools.matchAPN(apn.type)+"mdev");getContentResolver().update(uri, cv, "_id=?", new String[]{apn.id});}}private List<APN> getAPNList(){String tag = "Main.getAPNList()";//current不为空表示可以使用的APNString projection[] = {"_id,apn,type,current"};Cursor cr = this.getContentResolver().query(uri, projection, null, null, null);List<APN> list = new ArrayList<APN>();while(cr!=null && cr.moveToNext()) {Log.d(tag, cr.getString(cr.getColumnIndex("_id")) + " " + cr.getString(cr.getColumnIndex("apn")) + " " + cr.getString(cr.getColumnIndex("type"))+ " " + cr.getString(cr.getColumnIndex("current")));APN a = new APN();a.id = cr.getString(cr.getColumnIndex("_id"));a.apn = cr.getString(cr.getColumnIndex("apn"));a.type = cr.getString(cr.getColumnIndex("type"));list.add(a);}if(cr!=null){cr.close();}return list;}public static class APN{String id;String apn;String type;public String toString(){return this.id+":"+this.apn+":"+this.type;}}
}
package com.yuan.util;public class APNMatchTools {public static String matchAPN(String currentName) {if("".equals(currentName) || null==currentName){return "";}currentName = currentName.toLowerCase();if(currentName.startsWith(APNNet.CMNET))return APNNet.CMNET;else if(currentName.startsWith(APNNet.CMWAP))return APNNet.CMWAP;else if(currentName.startsWith(APNNet.GNET_3))return APNNet.GNET_3;else if(currentName.startsWith(APNNet.GWAP_3))return APNNet.GWAP_3;else if(currentName.startsWith(APNNet.UNINET))return APNNet.UNINET;else if(currentName.startsWith(APNNet.UNIWAP))return APNNet.UNIWAP;else if(currentName.startsWith("default"))return "default";else return "";}public static class APNNet{/*** 中国移动cmwap*/public static String CMWAP = "cmwap";/*** 中国移动cmnet*/public static String CMNET = "cmnet";//中国联通3GWAP设置 中国联通3G因特网设置 中国联通WAP设置 中国联通因特网设置//3gwap 3gnet uniwap uninet/*** 3G wap 中国联通3gwap APN*/public static String GWAP_3 = "3gwap";/*** 3G net 中国联通3gnet APN*/public static String GNET_3="3gnet";/*** uni wap 中国联通uni wap APN*/public static String UNIWAP="uniwap";/*** uni net 中国联通uni net APN*/public static String UNINET="uninet";}
}
最后不要忘记加上修改APN的权限：
Xml代码
<uses-permission android:name="android.permission.WRITE_APN_SETTINGS" />经过测试在G1 上联通和移动卡均是成功的。
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