Android对于APN

版权所有，转载请注明来自Mobile Developer (http://mdev.cc )  作者  : SinFrancis

 

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：

 

 

 <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。