Android：向 HorizontalScrollView 添加布局

发布于 2024-11-20 00:29:32 字数 1174 浏览 4 评论 0原文

我正在尝试创建类似于主屏幕布局的内容。它由单个水平方向的 LinearLayout 内的多个垂直方向的 LinearLayout 组成，所有这些都位于 HorizontalScrollView 中。我将其编写为一个名为“HomeLayout”的自定义类，扩展了 HorizontalScrollView。

hierarchyviewer

LinearLayout wrapper = new LinearLayout(getContext());
LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
wrapper.setLayoutParams(params);
wrapper.setOrientation(LinearLayout.HORIZONTAL);

addView(wrapper);

for(int i = 0; i < 2; i++) {
    LinearLayout linear = (LinearLayout) View.inflate(getContext(), R.layout.screens, null);    
    linear.setLayoutParams(params);

    wrapper.addView(linear);
}

问题是添加时“screen2”的宽度为“0”。

仅当我在 onDraw() 中调用它并使用 getMeasuredWidth() 和 getMeasuredHeight() 而不是 LayoutParams.FILL_PARENT 时，这才有效。即便如此，我也不确定这是否是正确的做法。

此外，我无法在 onCreate() 中引用视图“wrapper”、“screen1”、“screen2”。

我松散地关注了这个链接： http:// /blog.velir.com/index.php/2010/11/17/android-snapping-horizontal-scroll/

我做错了什么？

原文

I'm trying to create something similar to the home screen layout. This consists of multiple vertically oriented LinearLayouts within a single horizontally oriented LinearLayout, all housed in a HorizontalScrollView. I've written it as a custom class called 'HomeLayout' extending HorizontalScrollView.

hierarchyviewer

LinearLayout wrapper = new LinearLayout(getContext());
LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
wrapper.setLayoutParams(params);
wrapper.setOrientation(LinearLayout.HORIZONTAL);

addView(wrapper);

for(int i = 0; i < 2; i++) {
    LinearLayout linear = (LinearLayout) View.inflate(getContext(), R.layout.screens, null);    
    linear.setLayoutParams(params);

    wrapper.addView(linear);
}

The problem is 'screen2' has width '0' when added.

This only works if I call this in onDraw() and use getMeasuredWidth() and getMeasuredHeight() instead of LayoutParams.FILL_PARENT. And even then, I'm not sure if that's the right thing to do.

Furthermore I'm unable to reference the views 'wrapper', 'screen1', 'screen2' in onCreate().

I loosely followed this link: http://blog.velir.com/index.php/2010/11/17/android-snapping-horizontal-scroll/

What am I doing wrong?

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少年亿悲伤 2024-11-27 00:29:32

希望这对其他人有帮助。我通过以下方式实现 onMeasure() 解决了我的问题：

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);
    setMeasuredDimension(width, height);

    for(int i = 0; i < mWrapper.getChildCount(); i++) {
        View child = mWrapper.getChildAt(i);
        child.setLayoutParams(new LinearLayout.LayoutParams(width, 
        LayoutParams.FILL_PARENT));
    }

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

Hoping this helps others. I solved my problem by implementing onMeasure() in the following way:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);
    setMeasuredDimension(width, height);

    for(int i = 0; i < mWrapper.getChildCount(); i++) {
        View child = mWrapper.getChildAt(i);
        child.setLayoutParams(new LinearLayout.LayoutParams(width, 
        LayoutParams.FILL_PARENT));
    }

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

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