android APN的打开与关闭.doc

android APN的打开与关闭 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APN2、 关闭的时候设置一个错误APN就会自动关闭网络看代码：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 .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);Overridepublic 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 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 Stringapn.id);public void closeAPN()List 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 Stringapn.id);private List getAPNList()String tag = Main.getAPNList();/current不为空表示可以使用的APNString projection = _id,apn,type,current;Cursor cr = this.getContentResolver().query(uri, projection, null, null, null);List list = new ArrayList();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 APNString id;String apn;String type;APNMatchTools.javaJava代码package cc.mdev.apn;public final class APNMatchTools public static class APNNetpublic 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 uninetpublic 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(defau