以编程方式将矢量drawable / SVG绘制到屏幕上

Question

I'm trying to programmatically draw an SVG on to the screen. The code below is what I've tried, when I run the program nothing shows up.

    public MainView(Context context) {
        hexagon = AppCompatResources.getDrawable(context,R.drawable.hex_svg);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        hexagon.setBounds(30,30,30,30);
        hexagon.draw(canvas);
    }

Answer 1

The setBounds(int left, int top, int right, int bottom) method takes the positions of the bounding box of the drawable - you've set them all to 30 so you're setting the drawable's width and height to zero.

If you want the image to be at 30x,30y with a width and height of 30 then call setBounds(30, 30, 60, 60) .

Also I'd call this in the onLayout method rather than in onDraw .