java中使用switch case报错case expressions must be constant expressions

一、发现问题

private int CLICK_QUERY = 1;
private int CLICK_RESET = 2;

@Override
public void onClick(View v)
{
 int tag = (Integer) v.getTag();
 switch (tag)
 {
  case CLICK_QUERY:
   query();
  break;
  case CLICK_RESET:
   reset();
  break;
 }
}
编译时一直报错：CLICK_QUERY 和CLICK_RESET——case expressions must be constant expressions

二、解决问题

case后面必须跟常量，必须要常量，将上面两个变量声明为final即可。

private final int CLICK_QUERY = 1;
private final int CLICK_RESET = 2;