我如何将一个视图显示为另一个视图的叠加? [英] How would I display one view as an overlay of another?

问题描述

我有两个视图占据整个屏幕，我想同时显示两个视图，一个在另一个之上.我的布局如下所示:

I have two views that take the whole screen and I want to display both views at the same time, one on top of the other. My layout looks like this:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <WebView 
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
    />

    <org.example.myCustomView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
    />

</LinearLayout>

注意myCustomView使用onDraw(这个方法最后一个语句是invalidate())来绘制自定义图形.我遇到的问题是它只显示 myCustomView，WebView 是隐藏的.我尝试将 mycustomView 的背景颜色更改为透明，但这没有区别.

Note that myCustomView uses onDraw (this method last statement is invalidate()) to draw custom graphics. The problem I am getting is that it only displays myCustomView, WebView is hidden. I tried to change the background colour of mycustomView to transparent but this makes no difference.

我还希望能够将 myCustomView 作为 WebView 的叠加层，反之亦然.

I would also like to have the ability to make myCustomView as an overlay on WebView or vice versa.

推荐答案

对初学者使用 RelativeLayout.

您可以使用 ViewGroup.addView(View child, int index, ViewGroup.LayoutParams params) 或与 ViewGroup.removeView(View view) 或 <代码>ViewGroup.removeViewAt(int index).

You could use the ViewGroup.addView(View child, int index, ViewGroup.LayoutParams params) or a variant along with ViewGroup.removeView(View view) or ViewGroup.removeViewAt(int index).

这显然需要您使用 LayoutInflater 手动膨胀视图，但您可以在膨胀后保留对每个视图的全局引用，然后在两者之间切换.

This would obviously require you to inflate the views manually using LayoutInflater but you could keep a global reference to each after inflating and just flip between the two.

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