Android对于APN

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 cc.mdev.apn; import java.util.ArrayList; import java.util.List; 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; /** * 這裡是Activity * @author SinFrancis wong * @site http://mdev.cc * @wiki http://mdev.cc/wiki * @since 2010-01-08 */ public class Main extends Activity { /** Called when the activity is first created. */ Uri uri = Uri.parse("content://telephony/carriers"); @Override 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() { @Override public void onClick(View v) { openAPN(); } }); close.setOnClickListener(new View.OnClickListener() { @Override 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APN String 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; } }

APNMatchTools.java

package cc.mdev.apn; /** * 這裡是APN匹配，用於匹配移動或者聯通的APN * @author SinFrancis wong * @site http://mdev.cc * @wiki http://mdev.cc/wiki * @since 2010-01-08 * */ public final class APNMatchTools { 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"; } 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 ""; // return currentName.substring(0, currentName.length() - SUFFIX.length()); } }

最后不要忘记加上修改APN的权限：

Xml代码

<uses-permissionandroid:name="android.permission.WRITE_APN_SETTINGS"></uses-permission>

<uses-permission android:name="android.permission.WRITE_APN_SETTINGS"></uses-permission>

经过测试在G1 上联通和移动卡均是成功的。

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