如何动态添加视图到LinearLayout？

发布于 2025-01-05 08:41:03 字数 117 浏览 3 评论 0原文

有没有办法在 android 中动态添加图像并将其定位到线性布局中？在 php 中，我可以只回显图像标签并使用 css 来定位它，不太确定如何在 android 中解决这个问题，但是因为 xml 似乎是非常严格预定义的。

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初心未许 2025-01-12 08:41:03

您可以通过调用 ViewGroup.addView(View) 方法。
然而，这是一种模糊的添加视图的方式。首选的是，您首先为给定创建一个 LayoutParams布局（考虑到视图）这将允许您更密切地控制视图及其与其父视图的关系。

下面是一个将所有内容联系在一起的示例：

class MyActivity extends Activity {
    @Override public void onCreate(Bundle icicle) {
        super.onCreate(icicle)

        LinearLayout ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);
        // Create 5 view to take up a small amount of space.

        View tmp = null;

        for (int i = 0; i < 5; i++) {
            tmp = new View(this);
            ll.addView(tmpnew LinearLayout.LayoutParams(
                50, // Width
                50);    // Height
            // Either or both the width and height may be ViewGroup.
            // (WRAP_CONTENT || FILL_PARENT || MATCH_PARENT)
        }

        setContentView(ll);
    }
}

这就是动态地将视图添加到 LinearLayout 的方法。然而，由于 LinearLayout 的结构和设计，实际上没有太多的定位方式。将 LinearLayout 视为一个在一个方向上充满视图的数组，您唯一能做的就是更改它们在数组中的位置。如果您想对视图进行精细控制，我推荐 RelativeLayout。

You can add view to any ViewGroup by calling the ViewGroup.addView(View) method.
How ever, this is kind of a vague way of adding a View. What is preferred is that you first create a LayoutParams for the given layout (with the view in mind) This will allow you to control the view and its relationship with its parent view more intimately.

Here is a sample to tie everything together:

class MyActivity extends Activity {
    @Override public void onCreate(Bundle icicle) {
        super.onCreate(icicle)

        LinearLayout ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);
        // Create 5 view to take up a small amount of space.

        View tmp = null;

        for (int i = 0; i < 5; i++) {
            tmp = new View(this);
            ll.addView(tmpnew LinearLayout.LayoutParams(
                50, // Width
                50);    // Height
            // Either or both the width and height may be ViewGroup.
            // (WRAP_CONTENT || FILL_PARENT || MATCH_PARENT)
        }

        setContentView(ll);
    }
}

This is how you would dynamically add a view to a LinearLayout. However, due to the structure and design of a LinearLayout, there really isn't much in the way of positioning. Think of a LinearLayout as an array full of views in one direction, the only thing you can do is change where they are in the array. If you want fine control over a View, I recommend a RelativeLayout.

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