APN在Android中以编程方式设置

Question

我是在Android中以编程方式设置APN。当我运行代码时，我将获得Security Exception :android.permission.WRITE_APN_SETTINGS。如果我在清单中提到了此权限，我会收到仅此这些权限的系统应用程序的错误。 您能帮我解决这个问题吗？参考链接

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public int insertAPN(String name){      
    //Set the URIs and variables
    int id = -1;
    boolean existing = false;
    final Uri APN_TABLE_URI = Uri.parse("content://telephony/carriers");
    final Uri PREFERRED_APN_URI = Uri.parse("content://telephony/carriers/preferapn");
    //Check if the specified APN is already in the APN table, if so skip the insertion                      
    Cursor parser = getContentResolver().query(APN_TABLE_URI, null, null, null, null);
    parser.moveToLast();            
    while (parser.isBeforeFirst() == false){
        int index = parser.getColumnIndex("name");
        String n = parser.getString(index);   
        if (n.equals(name)){
            existing = true;   
            Toast.makeText(getApplicationContext(), "APN already configured.",Toast.LENGTH_SHORT).show();
            break;
        }            
        parser.moveToPrevious();
    }       
    //if the entry doesn't already exist, insert it into the APN table      
    if (!existing){         
           //Initialize the Content Resolver and Content Provider
           ContentResolver resolver = this.getContentResolver();
           ContentValues values = new ContentValues();
           //Capture all the existing field values excluding name
           Cursor apu = getContentResolver().query(PREFERRED_APN_URI, null, null, null, null);
           apu.moveToFirst();                   
           int index;       
           index = apu.getColumnIndex("apn");
           String apn = apu.getString(index);               
           index = apu.getColumnIndex("type");
           String type = apu.getString(index);              
           index = apu.getColumnIndex("proxy");
           String proxy = apu.getString(index);             
           index = apu.getColumnIndex("port");
           String port = apu.getString(index);               
           index = apu.getColumnIndex("user");
           String user = apu.getString(index);              
           index = apu.getColumnIndex("password");
           String password = apu.getString(index);              
           index = apu.getColumnIndex("server");
           String server = apu.getString(index);                
           index = apu.getColumnIndex("mmsc");
           String mmsc = apu.getString(index);             
           index = apu.getColumnIndex("mmsproxy");
           String mmsproxy = apu.getString(index);              
           index = apu.getColumnIndex("mmsport");
           String mmsport = apu.getString(index);               
           index = apu.getColumnIndex("mcc");
           String mcc = apu.getString(index);               
           index = apu.getColumnIndex("mnc");
           String mnc = apu.getString(index);               
           index = apu.getColumnIndex("numeric");
           String numeric = apu.getString(index);
           //Assign them to the ContentValue object
           values.put("name", name); //the method parameter
           values.put("apn", apn);                 
           values.put("type", type);
           values.put("proxy", proxy);
           values.put("port", port);
           values.put("user", user);
           values.put("password", password);
           values.put("server", server);
           values.put("mmsc", mmsc);
           values.put("mmsproxy", mmsproxy);
           values.put("mmsport", mmsport);             
           values.put("mcc", mcc);
           values.put("mnc", mnc);
           values.put("numeric", numeric);             
           //Actual insertion into table
           Cursor c = null;
           try{
               Uri newRow = resolver.insert(APN_TABLE_URI, values);
               if(newRow != null){
                   c = resolver.query(newRow, null, null, null, null);
                    int idindex = c.getColumnIndex("_id");
                    c.moveToFirst();
                    id = c.getShort(idindex);                       
               }
           }
           catch(SQLException e){}
           if(c !=null ) c.close();          
    }
    return id;
}
//Takes the ID of the new record generated in InsertAPN and sets that particular record the default preferred APN configuration
public boolean setPreferredAPN(int id){
    //If the id is -1, that means the record was found in the APN table before insertion, thus, no action required
    if (id == -1){
        return false;
    }
    Uri.parse("content://telephony/carriers");
    final Uri PREFERRED_APN_URI = Uri.parse("content://telephony/carriers/preferapn");
    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){}
     return res;
}
int identity = insertAPN("tmobile"); 
setPreferredAPN(identity);

Answer 1

来自Android Pie（API 28）您可以通过DevicePolicyManager配置APN，但是您需要按照Addoverrideapn文档中所述的设备库来配置APN

如何为测试提供设备旁边https://source.android.com/devices/tech/admin/testing-setup

在您的情况下，它可能不可行

Answer 2

尝试此

窗口 ->首选项 -> Android->棉绒错误检查。

从列表中查找 preectedpermission ，并将严重性设置为错误（例如信息）。这样您的项目仍将编译。

来源：仅授予System App的权限，在清单

Answer 3

这是Android 4.2的回归

此时（API 23）我能够阅读" APN"＆amp;未经许可的"类型"属性，可能是我急需的其他一些，但不是"当前"！