Android Gradient with center

public static PaintDrawable createTopBottomLinearGradientPaintDrawable(TwoColorGradient twoColorGradient, final float center) {
  final int[] colors =
      new int[]{twoColorGradient.getGradientStartColor(), twoColorGradient.getGradientEndColor()};
  ShaderFactory sf = new ShaderFactory() {
    @Override
    public Shader resize(int width, int height) {
      float[] positions = new float[]{0.0f, center};
      return new LinearGradient(0, 0, 0, width, colors, positions, TileMode.CLAMP);
    }
  };
  PaintDrawable paintDrawable = new PaintDrawable();
  paintDrawable.setShape(new RectShape());
  paintDrawable.setShaderFactory(sf);
  return paintDrawable;
}