How to draw a text at the corner of a bitmap android

Question

I have a bitmap and I am trying to draw a text over the bitmap at the top right corner. But at the first place I am not able to draw any text over it. I am converting a layout to bitmap and then trying to draw text over it. But its not working out. Here is my code:

private Bitmap viewToBitmap(LinearLayout layout) {
        Bitmap bitmap = Bitmap.createBitmap(layout.getWidth(), layout.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        layout.draw(canvas);
        canvas=new Canvas(bitmap);
        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setAntiAlias(true);
        paint.setTextSize(14.f);
        paint.setTextAlign(Paint.Align.CENTER);
        canvas.drawText("Hello Android!", 0, 0, paint);
        return bitmap;
    }

Are you fetching your bitmap dynamically or you have it static in your layout ? — Vivek Mishra, Aug 27 '18 at 09:33
Should I wrap FrameLayout over the LinearLayout? @VivekMishra — sagar suri, Aug 27 '18 at 09:35
@V-rundPuro-hit I tried that. But text is not visible in the bitmap. — sagar suri, Aug 27 '18 at 09:37
Actually there is a specific reason I am using LinearLayout @VivekMishra — sagar suri, Aug 27 '18 at 09:38
Using linear layout you can't overlap things. In linear layout items will be either aligned horizontally or vertically. You have to use either relative layout or frame layout. — Vivek Mishra, Aug 27 '18 at 09:40
I am converting the linearlayout in a bitmap and then I am trying to draw on that bitmap. @VivekMishra — sagar suri, Aug 27 '18 at 09:43
I don't understand the reason for converting it to bitmap for static layout. You can design your view with relative layout too. Why do you want to use Linear Layout only ? — Vivek Mishra, Aug 27 '18 at 09:46
I want to add a watermark while sharing the layout as image to other apps. @VivekMishra — sagar suri, Aug 27 '18 at 09:48
Then use relative layout.Keep your watermark view hidden when you don't want it and when sharing make it visible again — Vivek Mishra, Aug 27 '18 at 09:49
when user click on the share button..i am making the hidden layout visible..but that is also visible to the user for some duration of time on the screen. — sagar suri, Aug 27 '18 at 09:51
There are two images in the layout. So I am converting the layout into bitmap and trying to draw a watermark over it. — sagar suri, Aug 27 '18 at 09:52
my point is if you are converting layout into bitmap. why don't add that text as a textview inside that layout and covert it with textview. there will be no need for paint or canvas. — V-rund Puro-hit, Aug 27 '18 at 10:35
actually the user will share the image..so while sharing i need to draw that watermark on the image.. — sagar suri, Aug 27 '18 at 10:36

score 3 · Accepted Answer · answered Aug 27 '18 at 10:13

Please pay much attention to the text position & alignment.

private Bitmap viewToBitmap(View view)
{
    Bitmap result = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    view.draw(canvas);

    Paint paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setAntiAlias(true);
    paint.setTextSize(14);
    paint.setTextAlign(Paint.Align.RIGHT);
    canvas.drawText("Hello Android!", view.getWidth(), 14, paint); // draw watermark at top right corner
    return result;
}

one upvote for paint.setTextAlign(Paint.Align.RIGHT); i miss that in my answer — Ashvin solanki, Sep 05 '18 at 05:18

How to draw a text at the corner of a bitmap android

1 Answers1