如何將畫布複製到位圖

Question

有什麼方法可以將我剛繪製的畫布內容複製到位圖中？

編輯：只是爲了澄清，我當前的繪圖過程如下：

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 
} 

編輯：看一下第一個答案貼出來，我寫了下面的代碼：

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; 
} 

這應該意味着如果我將grab_screen設置爲n，那麼在下次調用onDraw時，圖像將被寫入screengrab_bitmap [n]。

Answer 1

創建一個「空的」位圖，將其分配給畫布（new Canvas（newBitmap）），在該畫布中繪製事物。您在畫布上繪製的所有內容都將繪製在位圖中。