Android 滚动时背景 ListView 变黑

Background ListView becomes black when scrolling

提问by TiGer

I have created a specific List which exists out of the following elements to create a scrollable list with every row containing a Image on the left side and some text on the right side:

我创建了一个特定的列表，它存在于以下元素中，以创建一个可滚动列表，其中每一行都包含左侧的图像和右侧的一些文本：

To begin with a "root" layout :

从“根”布局开始：

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:background="#C8C8C8"
    >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"
        android:drawSelectorOnTop="false"
        android:divider="#C8C8C8"
        android:background="#C8C8C8"/>
</LinearLayout>

and then within the ListView I place the following "row" item :

然后在 ListView 中放置以下“行”项：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:background="@drawable/bg_row"
>
    <ImageView
        android:layout_width="wrap_content"
        android:paddingLeft="10px"
        android:paddingRight="15px"
        android:paddingTop="5px"
        android:paddingBottom="5px"
        android:layout_height="wrap_content"
        android:src="@drawable/bg_image"
    />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="5px"
        android:paddingBottom="5px"
        android:textSize="16sp"
        android:textColor="#000000"
        android:layout_gravity="center"
        android:maxHeight="50px"/>
</LinearLayout>

As long as the screen is shown statically (as in no movement) it will be shown correctly, but when I start scrolling through the list the background of the row-item (an "icon" as can be shown in the code) will be shown correctly but the background of the "root" layout will become completely black... when the scrolling stops the background will, most of the times, get back its color... As I test I also added a TextViewin that root-element with the same background, this one will detain it's color when the List is scrolled... Any idea why this is happening, and how to solve this?

只要屏幕静态显示（如没有移动），它就会正确显示，但是当我开始滚动列表时，行项目的背景（可以在代码中显示的“图标”）将是正确显示，但“根”布局的背景将变成完全黑色......当滚动停止时，背景在大多数情况下会恢复其颜色......在我测试时，我还在TextView该根元素中添加了一个具有相同的背景，当滚动列表时，这个将保留它的颜色......知道为什么会发生这种情况，以及如何解决这个问题？

回答by Praveen

Add an attribute on the ListViewTag

在ListView标签上添加属性

android:cacheColorHint="#00000000" // setting transparent color

For more details check this blog

有关更多详细信息，请查看此博客

回答by Mahesh

It's very simple just use this line in your layout file :

非常简单，只需在您的布局文件中使用这一行：

android:scrollingCache="false"

like this:

像这样：

<ListView 
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollingCache="false"
/>

回答by nikki

you can use like this:

你可以这样使用：

list.setCacheColorHint(Color.TRANSPARENT);
list.requestFocus(0);

回答by AnDx

android:id="@android:id/list"
android:layout_width="fill_parent" 
android:layout_height="fill_parent"
android:drawSelectorOnTop="false"
android:divider="#C8C8C8"
android:background="#C8C8C8"
android:cacheColorHint="#00000000"/>

回答by Sampath Kumar

We have plenty of options for this problem, you can set the background as transparent through programming like

对于这个问题我们有很多选择，您可以通过编程将背景设置为透明

yourlistview.setCacheColorHint(Color.TRANSPARENT); 

or through xml

或通过 xml

android:cacheColorHint="@android:color/transparent"

回答by jeet parmar

In your xml where to use Listviewset

在您的 xml 中使用Listviewset

    android:cacheColorHint="@android:color/transparent"

回答by Ahmad Arslan

I am using images in listViewand it turns black sometimes in samsung s4 not even scrolling. It was a stupid mistake which I have done in the adapter.I just put my view to nullto fix this issue

我正在使用图像，listView它有时在三星 s4 中变成黑色，甚至不滚动。这是我在适配器中犯的一个愚蠢的错误。我只是将我的视图设置为 null来解决这个问题

 @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            Holder holder;
            convertView = null; // convert view should be null
            if (convertView == null) {
                holder = new Holder();
                convertView = inflater1.inflate(R.layout.listview_draftreport_item, null);
             } 
        }

回答by Rolf ツ

There are allot of answers to this question but today I realized this question is still missing a critical piece of information.

这个问题有很多答案，但今天我意识到这个问题仍然缺少一个关键信息。

There are two possible solutionsfor the problem, both work but each should be used in different situations.

该问题有两种可能的解决方案，两种解决方案都有效，但应在不同情况下使用每种解决方案。

---

---

Methods

方法

Use android:cacheColorHintwhen your ListViewhas a solidcolor background.

使用android:cacheColorHint时，你ListView有一个坚实的彩色背景。

<item name="android:cacheColorHint">@android:color/transparent</item>

Use android:scrollingCachewhen your ListViewhas a (complex) imageas background.

使用android:scrollingCache时，你ListView有一个（复）图像作为背景。

<item name="android:scrollingCache">false</item>

Note

笔记

When your ListViewhas a solid color background both methods will work, so not only the cacheColorHintwill work. But it's not recommended to use the scrolingCachemethod for solid color backgrounds since it turns off an optimization method used for smooth animating and scrolling the ListView.

当您ListView有纯色背景时，两种方法都可以使用，因此不仅cacheColorHint可以使用。但是不建议scrolingCache对纯色背景使用该方法，因为它关闭了用于平滑动画和滚动 ListView 的优化方法。

Note for the note:scrolingCacheset to false does not necessarily mean the ListView's animations and scrolling will become slow.

注意事项：scrolingCache设置为 false 并不一定意味着ListView的动画和滚动会变慢。

回答by muditagarwal88

android:cacheColorHint="@android:color/transparent"

回答by Lazy Ninja

The following worked for me:

以下对我有用：

myListView.setScrollingCacheEnabled(false);