scroll up and down using appium

import io.appium.java_client.MobileElement;

import io.appium.java_client.TouchAction;

import io.appium.java_client.android.AndroidDriver;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.Dimension;

import org.openqa.selenium.remote.DesiredCapabilities;

import org.testng.annotations.AfterMethod;

import org.testng.annotations.BeforeMethod;

import org.testng.annotations.Test;

public class NaukriAppTest {

    private AndroidDriver<MobileElement> driver;

    @BeforeMethod

    public void setUp() throws MalformedURLException {

        DesiredCapabilities capabilities = new DesiredCapabilities();

        capabilities.setCapability("deviceName", "Android Device");

        capabilities.setCapability("platformName", "Android");

        capabilities.setCapability("appPackage", "com.naukri.fragement");

        capabilities.setCapability("appActivity", "com.naukri.fragement.NaukriSplashScreen");

        driver = new AndroidDriver<>(new URL("http://127.0.0.1:4723/wd/hub"), capabilities);

        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

    }

    @Test

    public void testNaukriApp() {

        // Scroll down

        Dimension size = driver.manage().window().getSize();

        int x = size.width / 2;

        int startY = (int) (size.height * 0.8);

        int endY = (int) (size.height * 0.2);

        new TouchAction(driver).press(x, startY).waitAction().moveTo(x, endY).release().perform();

        // Scroll up

        new TouchAction(driver).press(x, endY).waitAction().moveTo(x, startY).release().perform();

        // Tap on an element

        MobileElement element = driver.findElementById("com.naukri.fragement:id/element_id");

        new TouchAction(driver).tap(element).perform();

        // Double tap on an element

        new TouchAction(driver).tap(element).waitAction(1000).tap(element).perform();

    }

    @AfterMethod

    public void tearDown() {

        driver.quit();

    }

}