安卓：设置列表视图项为＆QUOT;选择＆QUOT; （高亮） [英] Android: set list view item as "selected" (highlighted)

问题描述

在我的应用程序，我想要做类似的Gmail应用程序，一些平板电脑，在左侧有项目，并在右侧的列表中有与该项目的内容片断，像Gmail应用程序这个内容被选择后下载。当我点击一个项目，我希望它仍然突出，当然，直到我改变选择。 我的地步了这个工作，但只有当我点击两次在同一个项目，所以首先我点击，选择作品，然后该项目可以追溯到它的默认状态，如果我再次点击它，选择（选定状态）是可见的。

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.

这是我到目前为止有：

1）选择（listitem_background.xml）

1) The selector (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）对于列表项的顶部线性布局：

2) For the top linear layout of the list item:

android:background="@drawable/listitem_background"

（我试过设置此为listselector，以及）

(I tried setting this as listselector, as well)

3）这是ListView控件：

3) This is the ListView:

<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）在code部分我试着用这个玩：

4) In the code part I tried to play with this:

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    view.setSelected(true);
    ...
}

事实上，我也注意到，选择是遗失的片段后，在屏幕右侧的提交。如果我没有犯片段它的工作原理就像一个魅力... 我想我需要像这样的选择：

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:

<item android:drawable="@drawable/listitem_focused" android:state_activated="true" android:state_focused="false"/>

但显然不是这样...

But obviously not this...

推荐答案

OK，终于得到了答案。

OK, finally got my answer.

我们的想法是使用state_activated在选择器以及

The idea is to use the state_activated in the selector and

listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE) 

在code，或

android:choiceMode="singleChoice"

在XML，当然

这是选择应该是什么样子：

This is how the selector should look like:

<?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>

这是列表项的布局应该怎样为：

This is how the list item layout should be:

<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/>

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