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Android之drawable state各个属性详解

2024-08-12 03:18:41   218人阅读

<?xml version="1.0" encoding="UTF-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_selected="true" android:color="@color/white" />    <item android:state_checked="true" android:color="@color/white" />    <item android:color="@color/black" /></selector>

官方对各个state属性的介绍如下：

XML Attributes
Attribute NameRelated MethodDescription
android:constantSize If true, the drawable‘s reported internal size will remain constant as the state changes; the size is the maximum of all of the states. 
android:state_activated State value for StateListDrawable, set when a view or its parent has been "activated" meaning the user has currently marked it as being of interest. 
android:state_active State value for StateListDrawable. 
android:state_checkable State identifier indicating that the object may display a check mark. 
android:state_checked State identifier indicating that the object is currently checked. 
android:state_enabled State value for StateListDrawable, set when a view is enabled. 
android:state_first State value for StateListDrawable. 
android:state_focused State value for StateListDrawable, set when a view has input focus. 
android:state_last State value for StateListDrawable. 
android:state_middle State value for StateListDrawable. 
android:state_pressed State value for StateListDrawable, set when the user is pressing down in a view. 
android:state_selected State value for StateListDrawable, set when a view (or one of its parents) is currently selected. 
android:state_single State value for StateListDrawable. 
android:state_window_focused State value for StateListDrawable, set when a view‘s window has input focus. 
android:variablePadding If true, allows the drawable‘s padding to change based on the current state that is selected. 
android:visible Indicates whether the drawable should be initially visible. 

 

注意:如果有多个item，那么程序将自动从上到下进行匹配，最先匹配的将得到应用。（不是通过最佳匹配）
如果一个item没有任何的状态说明，那么它将可以被任何一个状态匹配。

 

Android之drawable state各个属性详解


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