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"/>

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