How to add rainbow gradient to an Image in android

Question

I want to add Transparent Rainbow or Spectrum Gradient to Bitmap.

In photoshop it is very easy. Now I want to do it programmatically. I have gone through a lot of research. But gradient has only one starting color and one ending. How could I add the rainbow color(multiple color) Gradient in Android.

Or is there a way to add that effect to bitmap in Android? Like given

see `LinearGradient (float x0, float y0, float x1, float y1, int[] colors, float[] positions, Shader.TileMode tile)` — pskink, Sep 30 '15 at 07:43

score 0 · Answer 1 · edited May 23 '17 at 11:44

0

for this you can use a translucent image with the desired gradient and put it on top of your image view in a FrameLayout. then capture bitmap of the view.

once you get your layout ready use this answer to capture bitmap from it

try this to convert a view (framelayout) into a bitmap:

public Bitmap viewToBitmap(View view) {
    Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    view.draw(canvas);
    return bitmap;
}

edited May 23 '17 at 11:44

Community

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answered Sep 30 '15 at 09:19

Rahul Tiwari

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Rahul I also wanna save it. Your procedure only shows an overlay. but when I save it remains the same – Zar E Ahmer Sep 30 '15 at 12:47
I will update you after testing it Rahul Tiwari and thanks for your help – Zar E Ahmer Sep 30 '15 at 13:23
@Nepster I was lazy to put an XML example for solution so I made an image. I invite you to improve my answer with xml snippet ;) – Rahul Tiwari Sep 30 '15 at 13:28

How to add rainbow gradient to an Image in android

1 Answers1