Android通过代码打开和关闭网络连接

我们都知道，要打开网络连接是要有相应的权限的，但是目前Android中并没有直接打开和关闭网络连接的权限，因此我们只能通过APN来实现：

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。

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

下面是源代码：

package com.mandr.network.demo;

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 OpenNetworkActivity extends Activity {
private Button open, close;
Uri uri =Uri.parse("content://telephony/carriers");

@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

open = (Button)findViewById(R.id.open);
close = (Button)findViewById(R.id.close);
open.setOnClickListener(newView.OnClickListener() {

publicvoid onClick(View v) {
openAPN();
}
});
close.setOnClickListener(newView.OnClickListener() {

publicvoid onClick(View v) {
closeAPN();
}
});
}

public void openAPN() {
List list = getAPNList();
for (APN apn : list) {
ContentValuescv = new ContentValues();
cv.put("apn",APNMatchTools.matchAPN(apn.apn));
cv.put("type",APNMatchTools.matchAPN(apn.type));
getContentResolver().update(uri,cv, "_id=?",
newString[] { apn.id });
}
}

public void closeAPN() {
List list = getAPNList();
for (APN apn : list) {
ContentValuescv = new ContentValues();
cv.put("apn",APNMatchTools.matchAPN(apn.apn) + "mdev");
cv.put("type",APNMatchTools.matchAPN(apn.type) + "mdev");
getContentResolver().update(uri,cv, "_id=?",
newString[] { apn.id });
}
}

private List getAPNList() {
String tag ="Main.getAPNList()";
// current不为空表示可以使用的APN
String projection[] = {"_id,apn,type,current" };
//查询数据库
Cursor cr =this.getContentResolver().query(uri, projection, null,
null,null);
List list = newArrayList();
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 = 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();
return list;
}

public static class APN {
String id;
String apn;
String type;
}

}

APNMatchTools.java
package com.mandr.network.demo;

public 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 uniwapuninet

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(StringcurrentName) {
if ("".equals(currentName) ||null == currentName) {
return"";
}
currentName =currentName.toLowerCase();
if(currentName.startsWith(APNNet.CMNET))
returnAPNNet.CMNET;
else if(currentName.startsWith(APNNet.CMWAP))
returnAPNNet.CMWAP;
else if(currentName.startsWith(APNNet.GNET_3))
returnAPNNet.GNET_3;
else if(currentName.startsWith(APNNet.GWAP_3))
returnAPNNet.GWAP_3;
else if(currentName.startsWith(APNNet.UNINET))
returnAPNNet.UNINET;
else if(currentName.startsWith(APNNet.UNIWAP))
returnAPNNet.UNIWAP;
else if(currentName.startsWith("default"))
return"default";
else
return"";
// returncurrentName.substring(0, currentName.length() -
// SUFFIX.length());
}

}
最后别忘了加入修改APN的权限：

更多相关文章

随机推荐