Android 5.0 android:elevation 如果給button設定效果,androidelevation
看到android5.0版本中提供了 elevation 的功能,我在SDK Manager 下載了 Android 5.0 例子代碼,看了下 ElevationBasic 例子,展示了2個view對象,一個圓形一個矩形,圓形設定了 android:elevation = 30dp,具體例子如下
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<?xml version="1.0" encoding="utf-8"?><!-- Copyright 2014 The Android Open Source Project Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.---> <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 中跑這裡例子,得到的效果如下
如果我把 組件換成按鈕Button,移除掉按鈕的其他屬性,就不會顯示 elevation 效果,如下
預設主題的按鈕樣式中包含了 android:elevation 和 android:translationZ 屬性,你可以移除掉預設的屬性動畫,並設定你自己的android:stateListAnimator 屬性
如下代碼
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<Button ... android:stateListAnimator="@null" /> <Button ... android:stateListAnimator="@anim/my_animator" /> |
預設的動畫(animator)在button_state_list_anim_material.xml定義。這裡是一個展示狀態下不可用,按鈕處於點擊狀態的例子
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<?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> <!-- 基本狀態 --> <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>
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