element locators are not working after proving id, class, xpath, css selector in appium

Question

driver.findElement(By.xpath("(//android.widget.EditText)[1]")).click(); driver.findElement(By.xpath("(//android.widget.EditText)[1]")).sendKeys("01591142540");

can anyone guide me regarding this declaration?

i have tried to send keys by locating an element and it didn't pass the value. I want some expert to locate the element so that i can send keys and do further operatino