如何将画布复制到位图

Question

有什么方法可以将我刚绘制的画布内容复制到位图中？

编辑：只是为了澄清，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：看一下第一个答案贴出来，我写了下面的代码：

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，那么在下次调用onDraw时，图像将被写入screengrab_bitmap [n]。

Answer 1

创建一个“空的”位图，将其分配给画布（new Canvas（newBitmap）），在该画布中绘制事物。您在画布上绘制的所有内容都将绘制在位图中。