getProperty

系统签名属性persist.sys.alex

persist表示持久，重启后仍然存在。sys表示system权限？

 

android:sharedUserId="android.uid.system"

private static final String PROPERTY_NODE = "persist.sys.alex";

public static String getProperty(String key, String defaultValue) {
        String value = null;
        try {
            Class<?> clazz = Class.forName("android.os.SystemProperties");
            Method get = clazz.getMethod("get", String.class, String.class);
            value = (String)(get.invoke(clazz, key, defaultValue));
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            return value;
        }
    }

    public static void setProperty(String key, String value) {
        try {
            Class<?> clazz = Class.forName("android.os.SystemProperties");
            Method method = clazz.getMethod("set", String.class, String.class);
            method.invoke(clazz, key, value);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }