On Aug 23, 2011, at 3:50 PM, chobo2 wrote:
> I want to change the color of a shape dynamically but I am unsure how.
>
> <?xml version="1.0" encoding="utf-8"?>
> <shape xmlns:android="http://schemas.android.com/apk/res/android";
> android:shape="rectangle">
> <solid
> android:color="#FFFF00" />
> <padding android:left="7dp"
> android:top="7dp"
> android:right="7dp"
> android:bottom="7dp" />
> </shape>
...
> // this seems to be how do it in android
> ShapeDrawable bgShape = (ShapeDrawable )btn.getBackground();
> bgShape.getPaint().setColor(Color.BLACK);
...
> ShapeDrawable bgShape = (ShapeDrawable)
> Resources.GetDrawable(Resource.Drawable.danger_box);
>
> but it crashes on the first line(does not really seem to give a error).
It crashes because of an InvalidCastException: Resources.GetDrawable() is
returning an Android.Graphics.Drawables.GradientDrawable, not a ShapeDrawable.
I'm not sure how the Android/Java code works at all (assuming it does; I
haven't tested), as the Android documentation clearly states that the <shape/>
element will return a GradientDrawable:
http://developer.android.com/guide/topics/resources/drawable-resource.html#Shape
compiled resource datatype: Resource pointer to a GradientDrawable.
- Jon
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