通过SharedPreferences实现简单的记住登录状态和保存密码

　　public static void setLogined(Context context, User user, boolean logined) {
        SharedPreferences.Editor editor = context.getSharedPreferences("isLogined", Context.MODE_PRIVATE).edit();
        editor.putString("username", user.getUsername());
        editor.putString("password", user.getPassword());   //记得加密
        editor.putBoolean("logined", logined);
        editor.apply();
    }

    public static User getLogined(Context context) {
        SharedPreferences pref = context.getSharedPreferences("isLogined", Context.MODE_PRIVATE);
        boolean logined = pref.getBoolean("logined", false);
        User user = new User();
        if (logined) {
            user.setUsername(pref.getString("username", ""));
            user.setPassword(pref.getString("password", ""));
            return user;
        } else {
            return null;
        }
    }