How to automate text writing in popup

Question

I want to automate text writing in popup. Is it possible? if yes, then please guide me. Any help will be well appreciated.

Answer 1

I got the solution:

driver.switchTo().frame(0);
driver.findElement(By.id("id of the view to enter text in the popup")).sendKeys("some text to enter");

Answer 2

If it's a browser popup, it sounds like you're looking for:

driver.switchTo().alert().sendKeys("some text to enter");