Android 5.0 android:elevation 如果给button设置效果

看到android5.0版本中提供了 elevation 的功能，我在SDK Manager 下载了 Android 5.0 例子代码，看了下 ElevationBasic 例子，展示了2个view对象，一个圆形一个矩形，圆形设置了 android:elevation = 30dp，具体例子如下

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 <? xml version = "1.0" encoding = "utf-8" ?> < FrameLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" > < View android:id = "@+id/floating_shape" android:layout_width = "80dp" android:layout_height = "80dp" android:layout_marginRight = "40dp" android:background = "@drawable/shape" android:elevation = "30dp" android:layout_gravity = "center" /> < View android:id = "@+id/floating_shape_2" android:layout_width = "80dp" android:layout_height = "80dp" android:layout_marginLeft = "25dp" android:background = "@drawable/shape2" android:layout_gravity = "center" /> FrameLayout >

在 Nexus 9 中跑这里例子，得到的效果如下

如果我把组件换成按钮Button，移除掉按钮的其他属性，就不会显示 elevation 效果，如下
默认主题的按钮样式中包含了 android:elevation 和 android:translationZ 属性，你可以移除掉默认的属性动画，并设置你自己的android:stateListAnimator 属性
如下代码

1 2 3 4 5 6 7 8 9 < Button ... android:stateListAnimator = "@null" /> < Button ... android:stateListAnimator = "@anim/my_animator" />

默认的动画（animator）在button_state_list_anim_material.xml定义。这里是一个展示状态下不可用，按钮处于点击状态的例子

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 <? xml version = "1.0" encoding = "utf-8" ?> < selector xmlns:android = "http://schemas.android.com/apk/res/android" > < item android:state_pressed = "true" android:state_enabled = "true" > < set > < objectAnimator android:propertyName = "translationZ" android:duration = "@integer/button_pressed_animation_duration" android:valueTo = "@dimen/button_pressed_z_material" android:valueType = "floatType" /> < objectAnimator android:propertyName = "elevation" android:duration = "0" android:valueTo = "@dimen/button_elevation_material" android:valueType = "floatType" /> set > item > < item android:state_enabled = "true" > < set > < objectAnimator android:propertyName = "translationZ" android:duration = "@integer/button_pressed_animation_duration" android:valueTo = "0" android:startDelay = "@integer/button_pressed_animation_delay" android:valueType = "floatType" /> < objectAnimator android:propertyName = "elevation" android:duration = "0" android:valueTo = "@dimen/button_elevation_material" android:valueType = "floatType" /> set > item > ... selector >

原文地址：http://www.itmmd.com/201412/240.html
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