Android:如何实现长按列表项时的发光效果？

Question

使用默认选择器，长按列表项会导致其背景在两种颜色之间转换。

将选择器替换为下面的选择器会移除效果。根据this question ，我需要一个动画来重现它。我将如何在 xml 中执行此操作？

<?xml version="1.0" encoding="utf-8"?>
<selector
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:state_pressed="true">
        <shape>
            <solid
                android:color="@color/state_pressed" />
        </shape>
    </item>
    <item
        android:state_focused="true">
        <shape>
            <solid
                android:color="@color/state_focused" />
        </shape>
    </item>
    <item>
        <shape>
            <solid
                android:color="@color/state_idle_grey" />
        </shape>
    </item>
</selector>

Answer 1

这是来自 list_selector_background 的代码:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:state_window_focused="false" android:drawable="@android: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>

找到 on the web .

它使用这种过渡来实现长按点击:

<transition xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/list_selector_background_pressed"  />
    <item android:drawable="@drawable/list_selector_background_longpress"  />
</transition>

找到 on the web too .

没有动画。记住让状态保持相同的顺序，或者至少在交换它们时考虑一下，顺序很重要。

就我个人而言，我喜欢事物以标准方式运行，所以我只使用标准列表选择器。

问候， 斯蒂芬