谁能解释一下原因publicvoidaddView(Viewchild){child.setDrawingCacheEnabled(true);child.setWillNotCacheDrawing(false);child.setWillNotDraw(false);child.buildDrawingCache();if(child.getDrawingCache()==null){//TODOMakethiswork!Log.w("View","Viewchild'sdrawingcacheisnull");}setImageBitmap(child.getDrawingCac