Android上关于cmwap/cmnet网络切换的疑惑？

           一、在网上看到一段代码，是检测当前手机网络，并且自动切换到Cmwap网络的demo，理论上是可行的，可以修改到cmwap的但是在实际运行中会报错这样的错误：

            二、错误如下：

            Caused by: java.lang.SecurityException: No permission to write APN settings: Neither user 10069 nor current process has   android.permission.WRITE_APN_SETTINGS.

            但是我已经加入了WRITE_APN_SETTINGS这个权限，在网上搜了一下，有人说4.0以上版本,google禁掉了android.permission.WRITE_APN_SETTINGS, 

            然后有人给出了一个同样问题的解决办法有：

                  一种是应用有ROOT权限，另外一种是设置APK的UID和system的一样，关键是我的手机已经root过了，就剩下下面个问题了，现在还没有找到解决办法，如果有朋友有好的解决办法，麻烦回复一下，多谢了。代码在下面：

         网友的问题：

                  网上搜了一下发现Android 2.3后不开放使用 MODIFY_PHONE_STATE

                 详细参见： http://code.google.com/p/android/issues/detail?id=15031

               http://stackoverflow.com/questions/4715250/how-to-grant-modify-phone-state-permission-for-apps-ran-on-gingerbread

                 有没有人解决过这个问题呢？

                网上搜索有两种解决方法，一种是应用有ROOT权限，另外一种是设置APK的UID和system的一样，可是都没有具体的实现方法，而且这两种方法也不是通用的。

                有人实现过这个功能么

            

 

                   

//获取当前APN属性

private boolean getCurrentAPN(){

        PREFERRED_APN_URI = Uri.parse("content://telephony/carriers/preferapn");

        cursor_current = this.getContentResolver().query(PREFERRED_APN_URI, null, null, null, null);

        if(cursor_current != null && cursor_current.moveToFirst()){

            String proxy = cursor_current.getString(cursor_current.getColumnIndex("proxy"));

            String apn = cursor_current.getString(cursor_current.getColumnIndex("apn"));

            String port = cursor_current.getString(cursor_current.getColumnIndex("port"));

            String current = cursor_current.getString(cursor_current.getColumnIndex("current"));

            if(proxy == null || apn == null || port == null || current == null

                    || proxy.equals("") || port.equals("")){

                return false;

            }

 

            if((proxy.equals("10.0.0.172") || proxy.equals("010.000.000.172")) && port.equals("80") &&

                    apn.equals("cmwap") && current.equals("1")){

                return true;

            }

        }

        return false;       

    }

 

 

//检查是否存在cmwap网络

    private boolean checkHasWapAPN(){

        APN_TABLE_URI = Uri.parse("content://telephony/carriers");

        cursor_need = this.getContentResolver().query(APN_TABLE_URI, null, null, null, null);

     

        while(cursor_need != null && cursor_need.moveToNext()){

            String id = cursor_need.getString(cursor_need.getColumnIndex("_id"));      

            String port = cursor_need.getString(cursor_need.getColumnIndex("port"));  

            String proxy = cursor_need.getString(cursor_need.getColumnIndex("proxy"));

            String current = cursor_need.getString(cursor_need.getColumnIndex("current"));

            String mmsc = cursor_need.getString(cursor_need.getColumnIndex("mmsc"));

            if(proxy == null || port == null || current == null){

                continue;

            }

           if((proxy.equals("10.0.0.172") || proxy.equals("010.000.000.172"))

                    && port.equals("80") && current.equals("1")

                    && mmsc == null){

                APN_Id = id;

                return true;

            }

        }

        return false;      

    }

 

 

//设置为cmwap网络

    public boolean setAPN(int id){

         

        //如果wifi是打开的，则关闭

        wifi = (WifiManager)getSystemService(Context.WIFI_SERVICE);

        if(wifi.isWifiEnabled()){

            wifi.setWifiEnabled(false);

        }

         

        boolean res = false;

        ContentResolver resolver = this.getContentResolver();

        ContentValues values = new ContentValues();

        values.put("apn_id", id);

        try{

            resolver.update(PREFERRED_APN_URI, values, null, null);

            Cursor c = resolver.query(PREFERRED_APN_URI, new String[]{"name", "apn"}, "_id=" + id, null, null);

            if(c != null){

                res = true;

                c.close();

            }

        }catch(SQLException e){

            Log.e("lhl", e.getMessage());

        }

        return res;

    }

 

 

//添加cmwap网络

    private int addCmwapAPN(){

        ContentResolver cr = this.getContentResolver();

        ContentValues cv = new ContentValues();

        cv.put("name", "cmwap");

        cv.put("apn", "cmwap");

        cv.put("proxy", "010.000.000.172");

        cv.put("port", "80");

        cv.put("current", 1);

 

        tm = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

        String imsi =tm.getSubscriberId();

        if(imsi != null){

            if(imsi.startsWith("46000")){

                cv.put("numeric", "46000");

                cv.put("mcc", "460");

                cv.put("mnc", "00");

            }

            else if(imsi.startsWith("46002")){

                cv.put("numeric", "46002");

                cv.put("mcc", "460");

                cv.put("mnc", "02");

            }

        }

         

        Cursor c = null;

        try{

            Uri newRow = cr.insert(APN_TABLE_URI, cv);

            if(newRow != null){

                c = cr.query(newRow, null, null, null, null);

                c.moveToFirst();

                String id = c.getString(c.getColumnIndex("_id"));

                setAPN(Integer.parseInt(id));

                return Integer.parseInt(id);

            }

             

        }catch(SQLException e){

            Log.e("lhl", e.getMessage());

        }

        finally{

            if(c != null){

                c.close();

            }

        }    

        return 0;       

    } 


　　
//需要添加一些权限：
 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 

<uses-permission android:name="android.permission.WRITE_APN_SETTINGS"/> 

<uses-permission android:name="android.permission.INTERNET"/> 

<uses-permission android:name="android.permission.READ_PHONE_STATE"/> 

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> 

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>