Canvas.drawbitmap not working

Question

I have to draw a line on the map. Due to the requirement of special line effects, I had to create a separate bitmap and draw lines on that bitmap, using a temporary canvas. Now When it completes drawing lines, I render it to the main canvas. Unfortunately, the below code is not working for me.

 @Override protected void draw(final Canvas canvas, final MapView mapView, final boolean shadow) { Bitmap pathBitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Config.ARGB_4444); Canvas tempCanvas = new Canvas(pathBitmap); tempCanvas.drawPath(mPath, this.mPaint); canvas.drawBitmap(pathBitmap, 0, 0, null); }

Could anyone please tell me what I'm doing wrong here?

Update: To see what I'm doing wrong. I created a new class and extended it with Drawable. In that class, I override the Draw method and used the same code with only parameter Canvas, and it worked. But don't know why it's not working on the MapView. Anyone please help me out?

try to change Config.ARGB_4444 to Config.ARGB_8888

Changwei Yao
– Changwei Yao

2013-08-23 05:39:20 +00:00
Commented Aug 23, 2013 at 5:39 — Changwei Yao
– Changwei Yao, Commented Aug 23, 2013 at 5:39
It's still not working.

user1294668
– user1294668

2013-08-23 05:42:20 +00:00
Commented Aug 23, 2013 at 5:42 — user1294668
– user1294668, Commented Aug 23, 2013 at 5:42

sergej shafarenka · Accepted Answer · 2013-08-23 05:41:23Z

1

You should rather use view's getWidget() and getHeight() instead of taking size of the canvas when creating a bitmap.

answered Aug 23, 2013 at 5:41

sergej shafarenka

20.5k7 gold badges72 silver badges89 bronze badges

Sign up to request clarification or add additional context in comments.

9 Comments

user1294668 Over a year ago

You mean to say I should use Mapview's height and width for the temporary canvas?

sergej shafarenka Over a year ago

If this is the size you need, then yes.

user1294668 Over a year ago

Nah, it's still not working. I can't figure out what I'm doing wrong here.

sergej shafarenka Over a year ago

Here is a "make sure" checklist: width and height are not 0, path is not empty, paint is configured to have a different color than canvas' background and it is of STROKE type with stroke width > 0. The code itself is correct.

user1294668 Over a year ago

Checked everything. width and height are 600 X 966. Here's the Paint object. Path is not empty. Paint() mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(color); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(6.0f);

|

Tim Cooper · Accepted Answer · 2018-04-19 06:51:02Z

I struggled with a similar issue. Eventually I looked at the console window and found this warning:

"OpenGLRenderer: Bitmap too large to be uploaded into a texture". Could that be your problem? See "Bitmap too large to be uploaded into a texture"

Collectives™ on Stack Overflow

Canvas.drawbitmap not working

2 Answers 2

9 Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

9 Comments

Comments

Linked

Related