How to define a circle shape in an android xml drawable file?

问题:

I have some problems finding the documentation of the definitions of shapes in XML for Android. I would like to define a simple circle filled with a solid color in an XML File to include it into my layout files.

Sadly the Documentation on android.com does not cover the XML attributes of the Shape classes. I think I should use an ArcShape to draw a circle but there is no explanation on how to set the size, the color, or the angle needed to make a circle out of an Arc.

回答1:

This is a simple circle as a drawable in Android.

回答2:

Set this as your view background

For solid circle use:

Solid with stroke:

Note: To make the oval shapes appear as circle, in these examples, either your view that your are using these shapes as its background should be a square or you have to set the height and width properties of the shape tag to an equal value.

回答3:

Code for Simple circle

回答4:

Look in the Android SDK samples. There are several examples in the ApiDemos project:

/ApiDemos/res/drawable/

• black_box.xml
• shape_5.xml
• etc

It will look something like this for a circle with a gradient fill:

回答5:

Use this

回答6:

Here's a simple circle_background.xml for pre-material:

You can use with the attribute 'android:background="@drawable/circle_background" in your button's layout definition

回答7:

回答8:

回答9:

If you want a circle try using the code below:

回答10:

Just use

ShapeDrawable circle = new ShapeDrawable( new  OvalShape() ); 

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