Android – Can we find element by ID in appium

following link mentions that we can find element by giving id… but i am unable to find it.

https://github.com/appium/appium/blob/master/docs/en/writing-running-appium/finding-elements.md

find by "name" (i.e., the text, label, or developer-generated ID a.k.a 'accessibilityIdentifier' of an element)

i tried following code:

WebElement el = driver.findElement(By.name("txtLogin"));

where txtLogin is id for login button

it gives following exception:

org.openqa.selenium.NoSuchElementException: An element could not be located on the page using the given search parameters. (WARNING: The server did not provide any stacktrace information)

can please anyone explain what are all the ways there to find elements in appium