有什么方法可以在API<中创建材质样式的阴影. 21(5.0棒棒糖)? [英] Is there any way to do a Material-style shadow in API < 21 (5.0 Lollipop)?

问题描述

材料设计十分强调在纸页"的隐喻上.为了制造这些，阴影是必不可少的.由于材料设计是一种哲学，而不是不是API (尽管它内置在L中)，所以应该在任何地方(Windows窗体，HTML/CSS等)完成. 如何在Android API 14至20中做到这一点?

Material design makes a huge emphasis on the metaphor of "sheets of paper". To make these, shadows are essential. Since Material design is a philosophy and not an API (despite it being built into L), this should be done anywhere (Windows Forms, HTML/CSS, etc.). How do I do this in Android API 14 to 20?

请注意，预制的PNG对于圆形和其他非正方形形状实际上并不实用.

Note that premade PNGs won't really be that practical for circular and other non-square shapes.

推荐答案

如果您不担心Lollipop的向后兼容性，则可以直接在XML中设置海拔高度属性

If you're not worried about backwards compatibility past Lollipop, you can set the elevation Attribute directly in the XML

    android:elevation="10dp"

否则，您必须使用support.v4.ViewCompat库在Java中进行设置.

Otherwise you have to set it in Java using the support.v4.ViewCompat library.

    ViewCompat.setElevation(myView, 10);

并将其添加到您的build.gradle

and add this to your build.gradle

    compile 'com.android.support:support-v4:21.+'

http://developer.android.com/reference/android/support/v4/view/ViewCompat.html#setElevation(android.view.View,%20float)

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