教你如何开关Android的APN网络

版权所有，转载请注明来自Mobile Developer (http://mdev.cc )  作者  : SinFrancis

说明：此程序需要将手机上的数据连接的按钮(下图)打开，才好使。（怎么用程序去打开这个按钮呢？各位大牛请不吝赐教！！！）

 

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

import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.net.ConnectivityManager; import android.net.NetworkInfo.State; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.Toast; public class OpenApnActivity extends Activity { Uri uri = Uri.parse("content://telephony/carriers"); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button open = (Button) findViewById(R.id.btnOpen); Button close = (Button) findViewById(R.id.btnClose); Button btnGoto = (Button) findViewById(R.id.btnGoto); open.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { openAPN(); } }); close.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { closeAPN(); } }); btnGoto.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(OpenApnActivity.this, EX05_17.class); // 调用一个新的Activity startActivity(intent); } }); } 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 }); } try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } check3GNetWork(); } private void check3GNetWork() { ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE) .getState(); // 如果3G网络未连接，且不是出于正在连接状态 if (mobile == State.CONNECTED || mobile == State.CONNECTING) { return; } Toast.makeText(getApplicationContext(), "网络未连接上...", Toast.LENGTH_LONG) .show(); } 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()) { 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")); Log.d(tag, cr.getString(cr.getColumnIndex("_id")) + " " + cr.getString(cr.getColumnIndex("apn")) + " " + cr.getString(cr.getColumnIndex("type")) + " " + cr.getString(cr.getColumnIndex("current"))); list.add(a); } if (cr != null) cr.close(); return list; } public static class APN { String id; String apn; String type; } }
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"; /** 中国电信net APN*/ public static String CTNET = "ctnet"; } 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 if (currentName.startsWith(APNNet.CTNET)) return APNNet.CTNET; else return ""; /** return currentName.substring(0, currentName.length() - SUFFIX.length());*/ } }
<uses-permission android:name="android.permission.WRITE_APN_SETTINGS"></uses-permission>