Android APN设置

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() {@Overridepublic void onClick(View v) {openAPN();}});                        close.setOnClickListener(new View.OnClickListener() {@Overridepublic 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());    }        }

APN权限

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

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