*最近接触到了银联Pos通这些业务，需要使用专网进行数据报文通讯，在这里自己写了一个工具类，进行配置APN专网
参数，并进行默认切换到自己添加进去的APN，实现专网数据通讯。
注意：为了防止在本地重复添加同一个APN数据，在每次保存之前先进行判断，没有检查到对应专网名的数据时进行本地添加否则直接进行专网切换即可。*

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下面贴出工具类源代码：

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.net.Uri;
import android.telephony.TelephonyManager;
import android.util.Log;/*** Created by hizha on 2018/4/17.*/public class APN {//取得全部的APN列表：public static final Uri APN_URI = Uri.parse("content://telephony/carriers");//    取得当前设置的APN：public static final Uri preferapn = Uri.parse("content://telephony/carriers/preferapn");//取得current=1的APNpublic static final Uri CURRENT_APN_URI = Uri.parse("content://telephony/carriers/current");private Context context;public static boolean hasAPN;public APN(Context context){this.context = context;}// 新增一个cmnet接入点//    public void APN() {////        checkAPN();//    }public int addAPN() {int id = -1;String NUMERIC = getSIMInfo();if (NUMERIC == null) {return -1;}ContentResolver resolver = context.getContentResolver();ContentValues values = new ContentValues();values.put("name", "专用APN");                                  //apn中文描述values.put("apn", "xxx.ln");                                     //apn名称values.put("type", "default");                            //apn类型values.put("numeric", NUMERIC);values.put("mcc", NUMERIC.substring(0, 3));values.put("mnc", NUMERIC.substring(3, NUMERIC.length()));values.put("proxy", "");                                        //代理values.put("port", "1116");                                         //端口values.put("mmsproxy", "");                                     //彩信代理values.put("mmsport", "");                                      //彩信端口values.put("user", "");                                         //用户名values.put("server","1.1.1.1");                                       //服务器values.put("password", "");                                     //密码values.put("mmsc", "");                                          //MMSCCursor c = null;Uri newRow = resolver.insert(APN_URI, values);if (newRow != null) {c = resolver.query(newRow, null, null, null, null);int idIndex = c.getColumnIndex("_id");c.moveToFirst();id = c.getShort(idIndex);}if (c != null)c.close();return id;}protected String getSIMInfo() {TelephonyManager iPhoneManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);return iPhoneManager.getSimOperator();}// 设置接入点public void SetAPN(int id) {ContentResolver resolver = context.getContentResolver();ContentValues values = new ContentValues();values.put("apn_id", id);resolver.update(APN_URI, values, null, null);
//        resolver.update(CURRENT_APN_URI, values, null, null);}public void checkAPN() {// 检查当前连接的APNCursor cr = context.getContentResolver().query(APN_URI, null, null, null, null);while (cr != null && cr.moveToNext()) {if (cr.getString(cr.getColumnIndex("apn")).equals("dlums.ln")) {Log.d("TAG", "apn: " + cr.getString(cr.getColumnIndex("apn")));int apnId = cr.getShort(cr.getColumnIndex("_id"));APN.hasAPN = true;Log.d("TAG", "id: " +apnId);setDefaultApn(apnId);break;}}}/*** 根据apnId将设置的APN选中** @param apnId* @return*/public boolean setDefaultApn(int apnId) {boolean res = false;Log.d("TAG","setDefaultApn:" + apnId);ContentResolver resolver = context.getContentResolver();ContentValues values = new ContentValues();values.put("apn_id", apnId);try {resolver.update(preferapn, values, null, null);Cursor c = resolver.query(preferapn, new String[]{"name","apn"}, "_id=" + apnId, null, null);if (c != null) {res = true;c.close();}} catch (SQLException e) {e.printStackTrace();}return res;}
}

使用的时候直接如下：

      APN apn = new APN(this);apn.checkAPN();if (!APN.hasAPN) {apn.SetAPN(apn.addAPN());}