基于安卓和三星的knox开发对apn的读写功能遇到一些问题

Question

加入权限：

创建apn方法：
//新建一个apn
public long createApn(){
EnterpriseDeviceManager edm = (EnterpriseDeviceManager)
getSystemService(EnterpriseDeviceManager.ENTERPRISE_POLICY_SERVICE);

ApnSettingsPolicy apnSettingsPolicy = edm.getApnSettingsPolicy();
ApnSettings apnSettings = new ApnSettings();
apnSettings.user = "ApnUser";
apnSettings.password = "1234";
apnSettings.server = "ApnServer";
apnSettings.mmsc = "http://mms.msg.eg.t-mobile.com/mms/wapenc";
apnSettings.mmsProxy = "127.0.0.0";
apnSettings.mmsPort = "80";
apnSettings.mcc = "310";
apnSettings.mnc = "260";
apnSettings.type = "default";
try {
long ret= apnSettingsPolicy.createApnSettings(apnSettings);
if (ret != -1) {
Log.w("APN", "APN created");
} else {
Log.w("APN", "APN creation failed");
}
return ret;
} catch (SecurityException e) {
Log.w("eeeeeeeeeeee", "SecurityException: " + e);

    }
    return -1;
}

程序运行后ret一直等于-1 新增失败，求问题所在

Answer 1

权限 代码在这里

Answer 2