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androidtransformantialiasing

Antialias the view being transformed

I am transforming child views in my viewgroup when I'm swiping through the viewgroup (kind of a cover-flow effect). I am using matrix.setPolyToPoly for transformation. The views have borders which need antialiasing severely.

So far I've tried to use

canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG));

in my children's onDraw, but it doesn't seem to change anything. Also, I'm aware of BitmapDrawable.setAntiAlias(true), but my children are not drawables, but full-blown viewgroups with views inside, so I cannot use that.

Solution

  • Override

        protected void dispatchDraw(Canvas canvas)

    in your custom layout and set filter there.

        canvas.setDrawFilter(new PaintFlagsDrawFilter(1, Paint.ANTI_ALIAS_FLAG));
    super.dispatchDraw(canvas);

    I encountered a similar issue in my cover flow inspired Gallery. This solved my issue.