Android 将 ListView 中的选择从橙色更改为绿色
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Change Selection in a ListView from Orange to Green
提问by jax
How do I do this per selected list item.
我如何为每个选定的列表项执行此操作。
I tried adding this to android:background
我尝试将其添加到 android:background
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true"
android:state_pressed="false"
android:drawable="@color/android_green" />
<item android:state_focused="true"
android:state_pressed="true"
android:drawable="@color/black_alpha" />
<item android:state_focused="false"
android:state_pressed="true"
android:drawable="@color/black_alpha" />
<item android:drawable="@color/white_alpha" />
</selector>
but it does not work, it changes the entire ListView.
但它不起作用，它改变了整个 ListView。
Still not working, here is what I have so far
仍然没有工作，这是我目前所拥有的
::listview_background
::listview_background
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:drawable="@color/black_alpha" />
<item android:drawable="@color/white_alpha" />
</selector>
::My view that is using the above
::我的观点是使用上面的
<ListView android:id="@+id/list" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:layout_below="@+id/round"
android:listSelector="@drawable/listview_background">
</ListView>
The problem is that the black_alpha will apply the the entire list, not just the selected list item
问题是 black_alpha 将应用整个列表，而不仅仅是选定的列表项
回答by Jay Askren
Here's a good articleon how to use selectors with lists.
Instead of setting it to be the android:backgroundof the ListView, I believe you want to set android:listSelectoras shown below:
而不是将其设置android:background为 ListView 的，我相信您希望设置android:listSelector如下所示：
<ListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:divider="@null"
android:dividerHeight="0dip"
android:listSelector="@drawable/list_selector" />
回答by b-ryce
Jax, you said that:
贾克斯，你说：
The problem is that the black_alpha will apply the the entire list, not just the selected list item
问题是 black_alpha 将应用整个列表，而不仅仅是选定的列表项
I had the same problem. After playing around with it for a while, I was able to get it to stop applying the color to the whole list by using a 3x3 png image of the color I wanted instead of applying a color. So for some weird reason if you use a color you get the odd background behavior, when you use a png, it works fine. :S
我有同样的问题。在玩了一段时间后，我能够通过使用我想要的颜色的 3x3 png 图像而不是应用颜色来让它停止将颜色应用于整个列表。因此，出于某种奇怪的原因，如果您使用一种颜色，您会得到奇怪的背景行为，当您使用 png 时，它可以正常工作。:S
So that is one way to get around it.
所以这是绕过它的一种方法。
-----Another way----------
- - -其它的办法 - - - - -
I found the best results when I set the listView selector to not have any states like this:
当我将 listView 选择器设置为没有任何这样的状态时，我发现了最好的结果：
res/drawable/list_selector.xml
res/drawable/list_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
</selector>
Then I take care of all the states in the background of the list item. NOT in the selector. I found I had more control this way.
然后我会处理列表项背景中的所有状态。不在选择器中。我发现这样我有更多的控制权。
res/color/list_item_bg.xml
res/color/list_item_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="false"
android:state_pressed="false"
android:drawable="@color/list_item_black_translucent" />
<item android:state_pressed="true"
android:drawable="@color/light_green_accent_translucent" />
</selector>
Then here is my list item:
然后这是我的列表项：
res/layout/simple_list_item.xml
res/layout/simple_list_item.xml
<?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:paddingRight="45dip"
android:paddingBottom="2dip"
android:layout_gravity="center_vertical"
android:background="@color/list_item_bg">
<ImageView
android:id="@+id/arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="8dip"
android:src="@drawable/list_item_arrow" />
<TextView
android:id="@+id/simple_list_item_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textSize="12sp"
android:textColor="@color/list_label_color"/>
</LinearLayout>
回答by Bkteo
I was also facing your problem where the color change applies to the whole list.
我也遇到了您的问题，其中颜色更改适用于整个列表。
But now its working for me now:
但现在它现在对我有用：
My main page containing the listview (noticed I did not apply the listselector here):
我的主页包含列表视图（注意到我没有在这里应用列表选择器）：
<ListView
android:id="@+id/controlList" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
Instead applied the listselector to getView, its like tell that particular row (convertView)to use the listselector.xml in drawable foldable when its state changes, e.g. pressed, focused...:
而是将 listselector 应用到 getView，它就像告诉特定行 (convertView)在它的状态发生变化（例如按下、聚焦...）时在可折叠可折叠中使用 listselector.xml：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView == null){
LayoutInflater li = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
convertView = li.inflate(R.layout.control_list, null);
viewHolder = new ViewHolder();
viewHolder.topText = (TextView) convertView.findViewById(R.id.toptext);
viewHolder.bottomText = (TextView) convertView.findViewById(R.id.bottomtext);
convertView.setTag(viewHolder);
}
else{
viewHolder = (ViewHolder) convertView.getTag();
}
//each convertView will be assigned the listselector
convertView.setBackgroundResource(R.drawable.listselector);
viewHolder.topText.setText(testSchemes[position]);
//viewHolder.vText.setText(testDetails[position]);
return convertView;
}
And finally my listselector.xml:
最后是我的 listselector.xml：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false"
android:state_selected="false"
android:drawable="@color/lightgreen" />
<!-- Even though these two point to the same resource, have two states so the drawable will invalidate itself when coming out of pressed state. -->
<item android:state_pressed="true"
android:drawable="@color/darkgreen" />
<item android:state_selected="true" android:state_pressed="false"
android:drawable="@color/orange" />
</selector>
This is what the above code does: All entries when first loaded are lightgreen. Scrolling up and down using cursor highlights the selected entry orange. Pressing a row turns it to darkgreen.
这就是上面的代码所做的：第一次加载时所有条目都是浅绿色的。使用光标上下滚动突出显示所选条目橙色。按一行将其变为深绿色。
回答by Ixx
As bigstones mentioned in a comment, a working solution is using a shape instead of a color (I was also getting the whole list highlighted). Here is a complete solution:
正如评论中提到的 bigstones，一个可行的解决方案是使用形状而不是颜色（我还突出显示了整个列表）。这是一个完整的解决方案：
add these 2 attributes to the listview:
将这两个属性添加到列表视图：
android:drawSelectorOnTop="true"
android:listSelector="@drawable/my_list_selector"
add my_list_selector.xml to drawable folder:
将 my_list_selector.xml 添加到 drawable 文件夹：
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="#77526F35"/>
</shape>
Now the list items should show a semitransparent green overlay on pressed state.
现在列表项应该在按下状态上显示一个半透明的绿色覆盖。
