Use this syntax to send input
WebElement email = driver.findElement(By.id(“com.appdev.myapp:id/et_email”));
email.click();
email.sendKeys("mubbashir@email.com");
But make sure you have hidden the keyboard while input using following line of code put it before your sendKey code
/******HIDING KEYBOARD DURING INPUT*****************/
capabilities.setCapability("unicodeKeyboard", false);
capabilities.setCapability("resetKeyboard", false);
/******HIDING KEYBOARD DURING INPUT*****************/