[android-developers] Set bounds for one layer of LayerDrawable?

I'm creating a custom View that looks like a horizontal ProgressBar but doesn't always have to touch the left edge. My approach is to use a LayerDrawable in which one layer uses different bounds (computed at run time). The attachement shows expected (top) versus actual (bottom) results.

From what I can tell, setting the bounds for one layer also sets the bounds for the entire LayerDrawable. The code in the custom View is essentially this:

int left, top, right, bottom;
/*... do some math ... */
Drawable d = mDrawable.findDrawableByLayerId(R.id.custom_layer_id);
d.setBounds(left, top, right, bottom);

Meanwhile, the xml for the drawable is this:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

<item>

<shape android:shape="rectangle" >

<solid android:color="#ff999999" />

</shape>

</item>

<item

android:id="@id/custom_layer_id"

android:drawable="@drawable/test_gradient"/>

</layer-list> 

Can I set bounds for an individual layer without affecting the other layers? If not, what can I do to get around this issue?

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