列表项长按过渡

Question

这是我用于列表项选择器的：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
<item android:drawable="@color/red" android:state_pressed="true"/>
<!-- pressed -->
<item android:drawable="@color/green" android:state_pressed="false"/>
<!-- normal -->
</selector>

我为ListView 项目启用了上下文菜单，以便用户可以长按某个项目。我想要的是当用户长按一个项目时，颜色应该从绿色变为红色。我怎样才能做到这一点？

Answer 1

您可以使用 list_selector_background 作为它，建议here

<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>

并使用过渡进行长按，正如here建议的那样：-

<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>

也许对你有帮助..