你好我想问一下，我设置Android systemproperty，在manifest中也设置了

android:sharedUserId="android.uid.system"

但是通过set设置属性的时候还是

Unable to set property "persist.sys.com.example.android.camera2basic" to "passed": connection failed; errno=13 (Permission denied)

我通过反射的方法设置的

package com.example.android.camera2basic;

import android.util.Log;

import java.lang.reflect.Method;

public class PropertyUtils {

    private static volatile Method set = null;
    private static volatile Method get = null;

    public static void set(String prop, String value) {

        try {
            if (null == set) {
                synchronized (PropertyUtils.class) {
                    if (null == set) {
                        Class<?> cls = Class.forName("android.os.SystemProperties");
                        set = cls.getDeclaredMethod("set", new Class<?>[]{String.class, String.class});
                    }
                }
            }
            Log.e("debug", "set: *** come here ?");
            set.invoke(null, new Object[]{prop, value});
            Log.e("debug", "set: *** come here2 ?");
        } catch (Throwable e) {
            Log.e("debug", "set: *** come here catch?");
            e.printStackTrace();
        }
    }


    public static String get(String prop, String defaultvalue) {
        String value = defaultvalue;
        try {
            if (null == get) {
                synchronized (PropertyUtils.class) {
                    if (null == get) {
                        Class<?> cls = Class.forName("android.os.SystemProperties");
                        get = cls.getDeclaredMethod("get", new Class<?>[]{String.class, String.class});
                    }
                }
            }
            value = (String) (get.invoke(null, new Object[]{prop, defaultvalue}));
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return value;
    }
}