尽管滚动，如何使 ProgressBar 保持在屏幕中央 [英] How to make a ProgressBar stay in the center of screen despite scrolling

问题描述

我在 ScrollView 中有一个 ProgressBar，尽管用户向下或向上滚动，但我希望它保持垂直居中.但是，我不确定如何完成此操作.

I have a ProgressBar in a ScrollView, and I'd like it to stay centered vertically despite the user scrolling down or up. However, I'm not sure how to accomplish this.

这是我拥有的代码，虽然很简单.我有一个不确定的 ProgressBar:

Here's the code that I have, simple as it is. I have an indeterminate ProgressBar:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/ocr_scroll_view"
android:layout_width="match_parent"
android:layout_height="fill_parent">

    <RelativeLayout android:id="@+id/image_holder"
    android:layout_gravity="end"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

        <ImageView android:id="@+id/image"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

        <ProgressBar android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:visibility="gone"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

我这样称呼它:

    spinningProgressBar = (ProgressBar)findViewById(R.id.progressBar1);
    spinningProgressBar.setIndeterminate(true);
    spinningProgressBar.setVisibility(View.GONE);

在适当的时候设置其可见性.

Setting its visibility at the appropriate times.

非常感谢所有建议.

推荐答案

把它放在 ScrollView 之外.只需让 ScrollView 和 ProgressBar 重叠即可.

Put it outside of the ScrollView. Just have the ScrollView and the ProgressBar overlap.

您可以在此处阅读有关如何重叠视图的信息:Android 中的重叠视图

You can read about how to overlap views here: Overlapping Views in Android

有几种方法可以做到这一点，从 GridLayouts 到 RelativeLayouts，然后是编程方式.

There's a couple of ways to do it, ranging from GridLayouts to RelativeLayouts and then programatic ways to do it.

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