Activity向fragment传入数值

因项目需要activity向fragment传值，搜索了很久，看了一些书，实现了代码：

我传入的是一个int类型值

activity（menu)

 static int User_id;//没有static会置0，具体原因不清楚
    public int getUser_id() {
        return User_id;
    }

public void setUser_id(int user_id) {
    User_id = user_id;
}

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_menu);
    User_id = 1;
    setUser_id(User_id);
}
Fragment：(HomeFragment)
public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

Menu menuactivity = new Menu();
User_id = menuactivity.getUser_id();
System.out.println("User_id = " + User_id);

}