APN(Access Point Name)，即“接入点名称”，用来标识GPRS的业务种类，目前分为两大类：CMWAP(通过GPRS访问WAP业务)、CMNET（除了WAP以外的服务目前都用CMNET,比如连接因特网等）。在做项目的时候,客户会要求更换APN,我在frameworks/base/services/core/java/com/android/server/customized/CustomizedService.java中实现了这些接口,下面我把APN的接口展示如下:

    public List selectAPN(String mNumeric){String where = "numeric=\"" + mNumeric + "\"";List l=new ArrayList();Cursor cr = mContext.getContentResolver().query(mUri, null, where, null, null);while(cr != null && cr.moveToNext()){ContentValues values = new ContentValues();values.put("id", cr.getString(cr.getColumnIndex("_id")));values.put("name", cr.getString(cr.getColumnIndex("name")));values.put("numeric", cr.getString(cr.getColumnIndex("numeric")));values.put("mcc", cr.getString(cr.getColumnIndex("mcc")));values.put("mnc", cr.getString(cr.getColumnIndex("mnc")));values.put("apn", cr.getString(cr.getColumnIndex("apn")));values.put("user", cr.getString(cr.getColumnIndex("user")));values.put("server", cr.getString(cr.getColumnIndex("server")));values.put("password", cr.getString(cr.getColumnIndex("password")));values.put("proxy", cr.getString(cr.getColumnIndex("proxy")));values.put("prot", cr.getString(cr.getColumnIndex("port")));values.put("authtype", cr.getString(cr.getColumnIndex("authtype")));values.put("type", cr.getString(cr.getColumnIndex("server")));l.add(values);}return l;}	  public int deleteAPN(String id){return mContext.getContentResolver().delete(mUri, "_id=" + id, null);}public int addAPN(String name,String numeric,String mcc,String mnc,String apn,String user,String server,String password,String proxy,String port,String authtype,String type){int id = -1;ContentValues values = new ContentValues();values.put("name", name);values.put("apn", apn);values.put("type", type);values.put("numeric", numeric);values.put("mcc", mcc);values.put("mnc", mnc);			values.put("port", port);values.put("proxy", proxy);values.put("user", user);values.put("server", server);values.put("password", password);values.put("authtype", authtype);Cursor c = null;Uri newRow = mContext.getContentResolver().insert(mUri, values);if (newRow != null) {c = mContext.getContentResolver().query(newRow, null, null, null, null);int idIndex = c.getColumnIndex("_id");c.moveToFirst();id = c.getShort(idIndex);}if (c != null)c.close();return id;}public int updateAPN(String id,String name,String numeric,String mcc,String mnc,String apn,String user,String server,String password,String proxy,String port,String authtype,String type){ContentValues values = new ContentValues();int idback=-1;String where = "_id=\"" + id + "\"";values.put("name", name);values.put("apn", apn);values.put("type", type);values.put("numeric", numeric);values.put("mcc", mcc);values.put("mnc", mnc);			values.put("port", port);values.put("proxy", proxy);values.put("user", user);values.put("server", server);values.put("password", password);values.put("authtype", authtype);idback=mContext.getContentResolver().update(mUri, values, where, null);return idback;}	public void setDefalutApn(String id) {	ContentValues values = new ContentValues();values.put("apn_id", id);mContext.getContentResolver().update(Uri.parse(PREFERRED_APN_URI), values, null, null);}

接口实现如上,该导入的包不要忘记了~