Android Drawable: Specifying shape width in percent in the XML file?

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You can’t specify a percentage. You need to specify a Dimension value to it.

android:width is defined here: http://developer.android.com/reference/android/R.attr.html#width :

(emphasis mine)

Must be a dimension value, which is a floating point number appended with a unit such as “14.5sp”. Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

For a definition of each dimension type, see: http://developer.android.com/guide/topics/resources/more-resources.html#Dimension

You will need to create your own attribute (see styleable) and perform the calculations yourself in onDraw(...).

See these two questions and the links therein for examples:

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