设置Android布局元素的背景色 [英] Setting background colour of Android layout element

问题描述

我正在尝试从 Android 上的一组幻灯片中克隆一个活动的设计，通常在res/values/colors.xml中指定.

#ffff0000</color>

并通过 android:background="@color/red" 使用它.这种颜色也可以用于其他任何地方，例如作为文本颜色.以同样的方式在 XML 中引用它，或者通过 getResources().getColor(R.color.red) 在代码中获取它.

您还可以使用任何可绘制资源作为背景，为此使用 android:background="@drawable/mydrawable"(这意味着 9patch drawables、普通位图、shape drawables，..).

I am trying to, somewhat clone the design of an activity from a set of slides on Android UI design. However I am having a problem with a very simple task.

I have created the layout as shown in the image, and the header is a TextView in a RelativeLayout. Now I wish to change the background colour of the RelativeLayout, however I cannot seem to figure out how.

I know I can set the android:background property in the RelativeLayout tag in the XML file, but what do I set it to? I want to define a new colour that I can use in multiple places. Is it a drawable or a string?

Additionally I would expect there to be a very simple way to this from within the Eclipse Android UI designer that I must be missing?

I am a bit frustrated currently, as this should be an activity that is performed with a few clicks at maximum. So any help is very appreciated. :)

解决方案

You can use simple color resources, specified usually inside res/values/colors.xml.

<color name="red">#ffff0000</color>

and use this via android:background="@color/red". This color can be used anywhere else too, e.g. as a text color. Reference it in XML the same way, or get it in code via getResources().getColor(R.color.red).

You can also use any drawable resource as a background, use android:background="@drawable/mydrawable" for this (that means 9patch drawables, normal bitmaps, shape drawables, ..).

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