画画布时出现java.lang.StackOverflowError：堆栈大小8MB

Question

I'm trying to draw some points on my view using a canvas. But as soon i try to draw my canvas on my view with

 view.draw(canvas);

I get the error java.lang.StackOverflowError: stack size 8MB and then my app crash immediately. Does someone has an idea how i can reduce the size of my canvas or fix this error ?

Here is my current code :

onDrawListener = new OnDrawListener() {
                @Override
                public void onLayerDrawn(Canvas canvas, float pageWidth, float pageHeight, int displayedPage) {
                    try {
                        Log.d("PdfViewer", "Drawing view");
                        Paint paint = new Paint();
                        paint.setColor(Color.RED);
                        canvas.drawPoint(canvas.getWidth() /2, canvas.getHeight() /2, paint);
                        view.draw(canvas); //here i get the error
                    } catch (Exception e) {
                        Log.d("PdfViewer", e.toString());
                    }


                }
            };

Thank you

Answer 1

The line you mentioned calls view.draw(canvas); This calls your onDrawListener , which calls view.draw(canvas) , which calls your onDrawListener , which calls view.draw(canvas) , and so on...

Every time a function calls another function, it passes data to the function it is calling through a "stack frame". This takes space in memory, and each stack frame gets freed when the function it is associated with returns. Since your onDrawListener calls itself, it will never return, and that memory will keep getting used, until there is none left.

Remove the line you highlighted, and, assuming no other issues are present, it should work.