Android：将列表视图项设置为“已选择”（突出显示）
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Android: set list view item as "selected" (highlighted)
提问by Ciprian
In my application I want to do something similar to gmail app on tablets, in the left to have the list of items and in the right to have a fragment with the content of that item, like for gmail app this content is being downloaded after selection. After I click on an item I want it to remain highlighted until, of course I change the selection. I reached a point where this works but only if I click twice on the same item, so first I click, selection works and then the item goes back to its 'default' state and if I click again on it, the selector (for selected state) is visible.
在我的应用程序中，我想在平板电脑上做一些类似于 gmail 应用程序的事情，在左边有项目列表，在右边有一个包含该项目内容的片段，比如对于 gmail 应用程序，这个内容是在选择后下载的. 在我单击一个项目后，我希望它保持突出显示，直到我更改了选择。我到达了一个可以工作的点，但只有当我在同一个项目上单击两次时，所以首先我单击，选择工作，然后项目返回到它的“默认”状态，如果我再次单击它，选择器（对于选定的状态）是可见的。
This is what I have so far:
这是我到目前为止：
1) The selector (listitem_background.xml)
1）选择器（listitem_background.xml）
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/solid_white" android:state_pressed="false" android:state_selected="false"/>
<item android:drawable="@drawable/listitem_pressed" android:state_pressed="true"/>
<item android:drawable="@drawable/listitem_focused" android:state_selected="true"/>
</selector>
2) For the top linear layout of the list item:
2）对于列表项的顶部线性布局：
android:background="@drawable/listitem_background"
(I tried setting this as listselector, as well)
（我也尝试将其设置为列表选择器）
3) This is the ListView:
3）这是列表视图：
<ListView
android:id="@+id/my_list_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:choiceMode="singleChoice"
android:dividerHeight="1dp"
android:drawSelectorOnTop="true"
android:fadeScrollbars="true"
android:fastScrollEnabled="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:scrollbarFadeDuration="100"
android:scrollbars="vertical" />
4) In the code part I tried to play with this:
4）在代码部分我试图玩这个：
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setSelected(true);
...
}
[EDIT] In fact I've noticed that the selection is lost after the commit of the fragment in the right side of the screen. If I don't commit the fragment it works like a charm... I think I need something like this in the selector:
[编辑] 事实上，我注意到在屏幕右侧提交片段后选择丢失了。如果我不提交片段，它就像一个魅力......我想我在选择器中需要这样的东西：
<item android:drawable="@drawable/listitem_focused" android:state_activated="true" android:state_focused="false"/>
But obviously not this...
但显然不是这个……
回答by Ciprian
OK, finally got my answer.
好的，终于得到我的答案了。
The idea is to use the state_activated in the selector and
这个想法是在选择器中使用 state_activated 和
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE)
in the code, or
在代码中，或
android:choiceMode="singleChoice"
in the xml, of course
在 xml 中，当然
This is how the selector should look like:
这是选择器的样子：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/solid_white" android:state_activated="false"/>
<item android:drawable="@drawable/solid_white" android:state_activated="false" android:state_pressed="false"/>
<item android:drawable="@drawable/listitem_pressed" android:state_pressed="true"/>
<item android:drawable="@drawable/listitem_focused" android:state_activated="true"/>
</selector>
This is how the list item layout should be:
列表项布局应该是这样的：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/listitem_background"
android:orientation="vertical" >
...
<LinearLayout/>
