Android: How to make a drawable with a multicolor gradient?

Question

I made this:

  ShapeDrawable.ShaderFactory shaderFactory = new ShapeDrawable.ShaderFactory() {
        @Override
        public Shader resize(int width, int height) {
            LinearGradient linearGradient = new LinearGradient(0, 0, width, height,
                    new int[]{
                            0xF44336,
                            0xFFB74D,
                            0xFFE082,
                            0xAED581,
                            0x4CAF50,
                            0xAED581,
                            0xFFE082,
                            0xFFB74D,
                            0xF44336},
                    new float[]{
                            0, 0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.75f, 0.875f, 1.0f},
                    Shader.TileMode.REPEAT);
            return linearGradient;
        }
    };
    PaintDrawable paint = new PaintDrawable();
    paint.setShape(new RectShape());
    paint.setShaderFactory(shaderFactory);

But I can't see anything when I set it as background in a view.

I simply call setBackground(paint), I tried with buttons, imageview and textview but no effects — user3290180, Oct 07 '15 at 11:26
Yes, that was the problem! with 0xFF (not 0xff) the colors appeared. Another doubt, do you know how to programmatically set the angle of the gradient to make it horizontal? — user3290180, Oct 07 '15 at 11:31
no difference if `0xFF` or `0xff`, for horizontal gradient see the first 4 params of `LinearGradient` constructor — pskink, Oct 07 '15 at 11:39

Abdul Wahab · Accepted Answer · 2015-10-07T12:47:09.323

6

try setting this drawable to your view background

GradientDrawable rainbow = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT,
            new int[] {Color.RED, Color.MAGENTA, Color.BLUE, Color.CYAN, Color.GREEN, Color.YELLOW, Color.RED});

edited Oct 07 '15 at 12:47

answered Oct 07 '15 at 11:14

Abdul Wahab

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I have more than 3 colors – user3290180 Oct 07 '15 at 11:22
1

Thanks for accepting it correct, I also used it in progress bar indeterminateDrawable,, some more modification will make it rainbow color moving as loader, like gmail loading bar below title bar,,, – Abdul Wahab Oct 08 '15 at 07:51

Android: How to make a drawable with a multicolor gradient?

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