问题来源
最近用了下RecyclerView,很好用,每个item我设置的是CardView包含一个TextView,
.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:id="@+id/cv_item"
card_view:cardCornerRadius="4dp">
"@+id/text_view"
android:padding="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
.support.v7.widget.CardView>
这样就可以显示cardview了,问题是给item添加一个selector
解决
1 类似Button直接在drawable下新建个card_selector.xml布局,然后设置CardView背景:
android:background="@drawable/card_selector"
然,,没有什么用。。
2 google了下,我来到了这里: Android-L CardView Visual Touch Feedback
给CardView添加个前景:
android:foreground="?android:attr/selectableItemBackground"
这样就可以了,在5.0以上的设备上有点击有波纹效果,5.0以下无波纹,只有前景色变化
3 自定义CardView前景
Android-L CardView Visual Touch Feedback 也给出了方法,分为5.0之前和之后两种设置,因为5.0之前没有ripple,所以5.0之前采用 inset 代替。
android:foreground="@drawable/card_foreground"
5.0之后
drawable-v21/card_foreground.xml
"http://schemas.android.com/apk/res/android"
android:color="#20000000"
android:drawable="@drawable/card_foreground_selector" />
drawable-v21/card_foreground_selector.xml
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#20000000"
android:drawable="@drawable/card_foreground_selector" />
drawable-v21/card_foreground_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<solid android:color="#18ffc400"/>
shape>
item>
<item android:state_focused="true" android:state_enabled="true">
<shape android:shape="rectangle">
<solid android:color="#0f000000"/>
shape>
item>
selector>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/card_foreground_selector"
android:insetLeft="2dp"
android:insetRight="2dp"
android:insetTop="4dp"
android:insetBottom="4dp"/>
drawable/card_foreground_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<solid android:color="#1838f508"/>
<corners android:radius="@dimen/card_radius" />
shape>
item>
<item android:state_focused="true" android:state_enabled="true">
<shape android:shape="rectangle">
<solid android:color="#0f000000"/>
<corners android:radius="@dimen/card_radius" />
shape>
item>
selector>
android:foreground="@drawable/card_foreground_selector"