Fill a canvas with a transparent color in Android

Question

Good Morning,

I have an ImageView that I initialized with #99aaaaaa color (it corresponds to 153,170, 170,170). after that I draw some lines with different colors. and Now I want to Fill my Canvas with the original color (#99aaaaaa).

The method myCanvas.drawColor(OriginalColor) fills the canvas with OriginalColor, but the lines still visible

    myPaint.setColor(OriginalColor);
    myPaint.setStyle(Paint.Style.FILL);
    myCanvas.drawRect(0, 0, 170, 170, myPaint); // my ImageView is  170X170

Also let lines visible.

Any help please, Thank You

http://stackoverflow.com/questions/8703581/how-to-make-canvas-draw-area-transparent-in-android — Triode, Nov 26 '13 at 11:46
@Triode I think that no relation with my question, I saw this before asking — RiadSaadi, Nov 26 '13 at 11:49
In my case I am drawing on the transparent (argb , a = 153) canvas, after that I want to reinitialize the canvas color. — RiadSaadi, Nov 26 '13 at 11:52

score 1 · Accepted Answer · edited Nov 26 '13 at 13:02

1

as the canvas original color is semi transparent, then you draw something on it and draw another layer of semi transparent stuff, then its pretty obvious youll see the level-down-layer through the top transparent layer isnt it? another words, if you place a half transparent glass on your knees, ull still see the knees through it

edited Nov 26 '13 at 13:02

RiadSaadi

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answered Nov 26 '13 at 12:25

Maciej Boguta

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score 1 · Answer 2 · answered Sep 20 '19 at 09:33

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Set the transfer mode as follows, before calling drawRec():

paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));

Reset the painter afterwards, for further drawing:

paint.setXfermode(null);
paint.setColor(0xFFFFFFFF);

answered Sep 20 '19 at 09:33

Alexander Hugestrand

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Fill a canvas with a transparent color in Android

2 Answers2