教你如何开关Android的APN网络

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：

Java代码

packagecc.mdev.apn;
importjava.util.ArrayList;
importjava.util.List;
importandroid.app.Activity;
importandroid.content.ContentValues;
importandroid.database.Cursor;
importandroid.net.Uri;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.widget.Button;
/**
*這裡是Activity
*@authorSinFranciswong
*@sitehttp://mdev.cc
*@wikihttp://mdev.cc/wiki
*@since2010-01-08
*/
publicclassMainextendsActivity{
/**Calledwhentheactivityisfirstcreated.*/
Uriuri=Uri.parse("content://telephony/carriers");
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Buttonopen=(Button)findViewById(R.id.open);
Buttonclose=(Button)findViewById(R.id.close);
open.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
openAPN();
}
});
close.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
closeAPN();
}
});
}
publicvoidopenAPN(){
List<APN>list=getAPNList();
for(APNapn:list){
ContentValuescv=newContentValues();
cv.put("apn",APNMatchTools.matchAPN(apn.apn));
cv.put("type",APNMatchTools.matchAPN(apn.type));
getContentResolver().update(uri,cv,"_id=?",newString[]{apn.id});
}
}
publicvoidcloseAPN(){
List<APN>list=getAPNList();
for(APNapn:list){
ContentValuescv=newContentValues();
cv.put("apn",APNMatchTools.matchAPN(apn.apn)+"mdev");
cv.put("type",APNMatchTools.matchAPN(apn.type)+"mdev");
getContentResolver().update(uri,cv,"_id=?",newString[]{apn.id});
}
}
privateList<APN>getAPNList(){
Stringtag="Main.getAPNList()";
//current不为空表示可以使用的APN
Stringprojection[]={"_id,apn,type,current"};
Cursorcr=this.getContentResolver().query(uri,projection,null,null,null);
List<APN>list=newArrayList<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")));
APNa=newAPN();
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();
returnlist;
}
publicstaticclassAPN{
Stringid;
Stringapn;
Stringtype;
}
}

APNMatchTools.java

Java代码

packagecc.mdev.apn;
/**
*這裡是APN匹配，用於匹配移動或者聯通的APN
*@authorSinFranciswong
*@sitehttp://mdev.cc
*@wikihttp://mdev.cc/wiki
*@since2010-01-08
*
*/
publicfinalclassAPNMatchTools{
publicstaticclassAPNNet{
/**
*中国移动cmwap
*/
publicstaticStringCMWAP="cmwap";
/**
*中国移动cmnet
*/
publicstaticStringCMNET="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
//3gwap3gnetuniwapuninet
/**
*3Gwap中国联通3gwapAPN
*/
publicstaticStringGWAP_3="3gwap";
/**
*3Gnet中国联通3gnetAPN
*/
publicstaticStringGNET_3="3gnet";
/**
*uniwap中国联通uniwapAPN
*/
publicstaticStringUNIWAP="uniwap";
/**
*uninet中国联通uninetAPN
*/
publicstaticStringUNINET="uninet";
}
publicstaticStringmatchAPN(StringcurrentName){
if("".equals(currentName)||null==currentName){
return"";
}
currentName=currentName.toLowerCase();
if(currentName.startsWith(APNNet.CMNET))
returnAPNNet.CMNET;
elseif(currentName.startsWith(APNNet.CMWAP))
returnAPNNet.CMWAP;
elseif(currentName.startsWith(APNNet.GNET_3))
returnAPNNet.GNET_3;
elseif(currentName.startsWith(APNNet.GWAP_3))
returnAPNNet.GWAP_3;
elseif(currentName.startsWith(APNNet.UNINET))
returnAPNNet.UNINET;
elseif(currentName.startsWith(APNNet.UNIWAP))
returnAPNNet.UNIWAP;
elseif(currentName.startsWith("default"))
return"default";
elsereturn"";
//returncurrentName.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>

经过测试在G1 上联通和移动卡均是成功的。

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