Convert Canvas to Bitmap

Question

I have a canvas object and i'm searching for a method to draw a canvas into a Bitmap object like that:

Canvas canvas = ...;
Bitmap bitmap = Bitmap.createBitmap(canvas);

Is there a way to do that?

no, ther is no such way, however the opposite is available: `new Canvas(Bitmap)` — pskink, Oct 12 '18 at 13:48
what do you want to achieve actually? where do you have that `Canvas` object from? — pskink, Oct 12 '18 at 13:53
this Canvas contains my whole interface, so this operation would be like get a screenshot as Bitmap — Filippo, Oct 12 '18 at 13:57
so you have some `draw(Canvas canvas)` method, right? then simply call it passing the `new Canvas(bitmap)` — pskink, Oct 12 '18 at 13:58

Roga Lu · Answer 1 · 2018-10-12T14:04:32.777

0

This may help:

private Bitmap getBitmap(int drawableRes, Context context) {
    Drawable drawable = context.getResources().getDrawable(drawableRes);
    Canvas canvas = new Canvas();
    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), 
    drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    canvas.setBitmap(bitmap);
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), 
    drawable.getIntrinsicHeight());
    drawable.draw(canvas);
    return bitmap;
}

You call it like this:

     Bitmap drawableBitmap = getBitmap(YourResource, mContext);

So you create a new Bitmap, with width and height being the same as your canvas.

  Bitmap myBitmap = new Bitmap( (int)Width, (int)Height, Config.RGB_565 )
  canvas.setBitmap(myBitmap)

but not drawBitmap

edited Oct 12 '18 at 14:04

answered Oct 12 '18 at 13:47

Roga Lu

162
1
3
14

What should do I have to pass as drawableRes? – Filippo Oct 12 '18 at 13:50
This may explain better than me: https://stackoverflow.com/questions/4013725/converting-a-canvas-into-bitmap-image-in-android – Roga Lu Oct 12 '18 at 14:06

score -2 · Answer 2 · answered Oct 12 '18 at 13:50

-2

Try this code :

Canvas canvas = ...;
Bitmap bitmap = Bitmap.createBitmap(canvas);

canvas.setBitmap(bitmap);

answered Oct 12 '18 at 13:50

riciprini

103
4

where did you see such method: `Bitmap.createBitmap(Canvas)`? – pskink Oct 12 '18 at 13:51
1

The problem is that the createBitmap's method does not accept canvas as argument – Filippo Oct 12 '18 at 13:52
1

Your answer doesn't make any sense `createBitmap(`) method accept `bitmap` as a parameter, not `canvas` – Mouaad Abdelghafour AITALI Jun 07 '19 at 20:45

Convert Canvas to Bitmap

2 Answers2