每次单击菜单时都会切换linearlayout（imageview）-Toggleoflinearlayoutoneveryclickofmenu(imageview)

0  

You can use an if/else statement to check the current state every time your button is pressed and switch. You don't necessarily need to check for the visibility being GONE if you're not going to set it to GONE ever so you can remove that condition.

每次按下按钮并切换时，都可以使用if / else语句检查当前状态。如果您不打算将其设置为GONE，则不一定需要检查GONE的可见性，以便您可以删除该条件。

The difference between GONE and INVISIBLE is that the layout reacts to gone as if it weren't even there, the element no longer causes any displacement.

GONE和INVISIBLE之间的区别在于布局的反应就像它甚至不存在一样，元素不再导致任何位移。

Change line2.setVisibility(View.VISIBLE); to

更改line2.setVisibility（View.VISIBLE）;至

   if (line2.getVisibility() == View.GONE || line2.getVisibility() == View.INVISIBLE ) {
       line2.setVisibility(View.VISIBLE); } 
   else { 
       line2.setVisibility(View.GONE); // Set it to View.INVISIBLE if thats your goal.
   }

1  

You can try -

你可以试试 -

       //line2.setVisibility(View.VISIBLE);
       if(line2.getVisibility() == View.VISIBLE)
       {
           line2.setVisibility(View.GONE);
       }
       else
       {
           line2.setVisibility(View.VISIBLE);
       }