Android ListView僅在滾動后顯示ListSelector

Question

我向ListView添加了一個簡單的ListSelector 。 問題是，在ListView稍微滾動一下之后，才顯示ListSelector 。

如何使ListSelector在選擇時立即出現？

列表顯示

<ListView
    android:id="@+id/contentListView"
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true" 
    android:layout_above="@id/buttonEntwerten" 
    android:scrollingCache="false"
    android:cacheColorHint="#00000000"

    android:listSelector="@drawable/list_selector"
/>

@ drawable / list_selector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:drawable="@drawable/list_selector__gradient_bg_hover" />
</selector>

Answer 1

您可以查看android如何對其進行配置，並進行相應的更改（文件名為“ list_selector_background.xml”）：

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_window_focused="false" android:drawable="@color/transparent" />

    <!-- 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_focused="true"  android:state_enabled="false" android:state_pressed="true" android:drawable="@drawable/list_selector_background_disabled" />
    <item android:state_focused="true"  android:state_enabled="false"                              android:drawable="@drawable/list_selector_background_disabled" />
    <item android:state_focused="true"                                android:state_pressed="true" android:drawable="@drawable/list_selector_background_transition" />
    <item android:state_focused="false"                               android:state_pressed="true" android:drawable="@drawable/list_selector_background_transition" />
    <item android:state_focused="true"                                                             android:drawable="@drawable/list_selector_background_focus" />

</selector>

簡而言之，您只需要處理state_pressed state。 其余的都是要處理的好狀態。

您的代碼中的問題是它沒有狀態。