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

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;
public class Main extends Activity {
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;
public final class APNMatchTools {
public static class APNNet{
public static String CMWAP = "cmwap" ;
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
public static String GWAP_3 = "3gwap" ;
public static String GNET_3= "3gnet" ;
public static String UNIWAP= "uniwap" ;
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：

开关Android的APN网络

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