java - 如何将 Canvas 复制到位图中

Question

有什么方法可以将我刚刚绘制的 Canvas 内容复制到位图中吗？

编辑:澄清一下，我当前的绘图过程如下:

Canvas canvas = holder.lockCanvas();

if (canvas != null)
{
  onDraw(canvas); // this does all the drawing

  // at this point I would like to copy the canvas into a bitmap

  holder.unlockCanvasAndPost(canvas); // this makes the canvas visible to the user
}

编辑:查看发布的第一个答案，我编写了以下代码:

if (grab_screen == -1) // draw and show on screen as normal
{
    Canvas canvas = holder.lockCanvas();
    if(canvas != null)
    {
        onDraw(canvas);
        holder.unlockCanvasAndPost(canvas);
    }                   
}
else // draw into screengrab_bitmap[grab_screen]
{
    Canvas canvas = new Canvas(screengrab_bitmap[grab_screen]);
    onDraw(canvas);
    grab_screen = -1;
}

这应该意味着如果我将 grab_screen 设置为 n，那么在下一次调用 onDraw 时，图像将被写入 screengrab_bitmap[n]。

Answer 1

创建一个“空”位图，将其分配给 Canvas (new Canvas(newBitmap) )，在该 Canvas 中绘制内容。您在 Canvas 上绘制的所有内容都将绘制在位图中。