教你如何开关Android的APN网络

转载来自Mobile Developer (http://mdev.cc )

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
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;
}

}

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

Java代码
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());
}

}

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

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