android：一个新手 GUI 问题 - 如何在没有布局 XML 文件的情况下声明 viewGroup？

发布于 2024-10-05 20:56:02 字数 578 浏览 2 评论 0原文

在应用程序中，我正在努力解决我有一个自定义视图。我无法在布局 XML 文件中声明它，因为我将在保存自定义视图实例的活动中使用它，并且我需要访问它（无法覆盖 findViewById...）。

因此我决定将所有 GUI 元素声明到 Activity 中。

但我根本无法向前迈出一步，因为我什至无法实例化 viewGroup...

这就是我正在尝试的：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ViewGroup vg = new ViewGroup(this.getApplicationContext());

    setContentView(vg);

}

我得到“无法实例化 ViewGroup”...

有人可以给出一个直接的例子，说明如何声明一个 viewGroup，它保存视图？

该类的文档也不太适合初学者...所有示例都集中在描述布局 XML 文件中的布局...？

感谢您的努力，举个例子！

原文

In the app, I'm struggling with I have a custom view.
I cannot declare it in layout XML file, because I'm going to use in from the activity that holds my custom view instance and I need to have access to it (cannot override findViewById...).

Thereof I decided to declare all of the GUI elements into the Activity.

But I simply cannot make a single step forward, since I even cannot instantiate viewGroup...

This is what I'm trying:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    ViewGroup vg = new ViewGroup(this.getApplicationContext());

    setContentView(vg);

}

and I get 'Cannot instantiate ViewGroup'...

Can someone give a straight-forward example, of how to declare a viewGroup, that holds views?

The documentation of the class is also not very beginner-friendly... all the examples are focused on describing the layout in a layout XML file...?

Appreciate your efford, giving an example!

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财迷小姐 2024-10-12 20:56:02

[ViewGroup][1] 是一个抽象类，您无法实例化它。它定义了一种类，该类将成为在其中放置其他视图的容器。换句话说，像RelativeLayout的LinearLayout这样的布局都是ViewGroup。因此，您可以执行类似的操作：

   @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  LinearLayout vg = new LinearLayout(this);
// set the LayoutParams the way you want.
// and add textviews, imageviews, ... here for instance.
  setContentView(vg);

 }

对于 LayoutParams，我认为你应该从 LayoutParams.Fill_parent 开始

[ViewGroup][1] is an abstract class, you cannot instantiate it. It defines a type of classes that will be container to put other views in them. In other words, layouts like LinearLayout of RelativeLayout are ViewGroup. Thus, you could do something like that :

   @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  LinearLayout vg = new LinearLayout(this);
// set the LayoutParams the way you want.
// and add textviews, imageviews, ... here for instance.
  setContentView(vg);

 }

For the LayoutParams, I think you should start with LayoutParams.Fill_parent

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