Cannot find elements by xpath

The page is as bellow

you see, all the emotions have no id, I want to locate all of them.

 @AndroidFindBy(xpath = "//*")
  private List<WebElement> emotions;

but it does not work.

Then I try to locate one of them

@AndroidFindBy(xpath = "//[@index='2']")
 private WebElement emotions;

Still I cannot locate the element, please help to see what’s wrong ,thanks in ahead.