Selector 属性
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:constantSize=["true" | "false"]//drawable的大小是否当中状态变化,true表示是变化,false表示不变换,默认为false
android:dither=["true" | "false"]//当位图与屏幕的像素配置不一样时(例如,一个ARGB为8888的位图与RGB为555的屏幕)会自行递色(dither)。设置为false时不可递色。默认true
android:variablePadding=["true" | "false"] >//内边距是否变化,默认false
<item
android:drawable="@[package:]drawable/drawable_resource"//图片资源
android:state_pressed=["true" | "false"]//是否触摸
android:state_focused=["true" | "false"]//是否获取到焦点
android:state_hovered=["true" | "false"]//光标是否经过
android:state_selected=["true" | "false"]//是否选中
android:state_checkable=["true" | "false"]//是否可勾选
android:state_checked=["true" | "false"]//是否勾选
android:state_enabled=["true" | "false"]//是否可用
android:state_activated=["true" | "false"]//是否激活
android:state_window_focused=["true" | "false"] />//所在窗口是否获取焦点
</selector>
示例:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="@drawable/selected" />
<item android:state_focused="true" android:drawable="@drawable/focused" />
<item android:state_pressed="true" android:drawable="@drawable/pressed" />
<item android:drawable="@drawable/normol" />
</selector>
调用:
<Button
android:id="@+id/bt_about"
style="@style/Button_style"
android:background="@drawable/button_selector"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textColor="@color/test_color_selector"
android:text="@string/about" />