android - 为什么我需要在 ViewThread 构造函数中将面板类作为参数传递..？

Question

         public class ViewThread extends Thread 
         {
            private Panel mPanel;
            private SurfaceHolder mHolder;
            private boolean mRun = false;

            public ViewThread(Panel panel) 
            {
               mPanel = panel;
               mHolder = mPanel.getHolder();
            }

为什么我需要将 Panel 类作为参数传递给 ViewThread 构造函数？

Answer 1

正如 Mitch 所说，构造函数需要一个 Panel 对象。如果你不想那样(虽然我想这是有原因的)你可以简单地写第二个构造函数，比如

         public class ViewThread extends Thread 
         {
            private Panel mPanel;
            private SurfaceHolder mHolder;
            private boolean mRun = false;

            public ViewThread(Panel panel) 
            {
               mPanel = panel;
               mHolder = mPanel.getHolder();
            }


            public ViewThread()
            {   
               // Do something constructive here, like
               mPanel = new Panel(); 
            }