Android:将列表视图项设置为“已选择"；(突出显示) [英] Android: set list view item as "selected" (highlighted)

问题描述

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，这个内容正在选择后下载.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.我到达了一个可行的点，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.

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.

这是我目前所拥有的:

1)选择器(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"

(我也尝试将其设置为列表选择器)

(I tried setting this as listselector, as well)

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) 在代码部分，我试着玩这个:

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:

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"/>

但显然不是这个...

推荐答案

好的，终于有答案了.

想法是在选择器中使用 state_activated 和

The idea is to use the state_activated in the selector and

listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE) 

在代码中，或

android:choiceMode="singleChoice"

当然是在xml中

选择器应该是这样的:

<?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>

列表项的布局应该是这样的:

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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