//firstly it is needed to wait for some context using regular expression pattern
//and switch to this context
AppiumFunction<Pattern, WebDriver> contextFunction = input -> {
        Set<String> contexts = driver.getContextHandles();
        String current = driver.getContext();
        contexts.forEach(context -> {
            Matcher m = input.matcher(context);
            if (m.find()) {
                driver.context(context);
            }
        });
       if (!current.equals(driver.getContext())) {
            return driver;
       }
        return null;
 };

//and then fetch some elements by tag. The rendering can take some time
private final AppiumFunction<WebDriver, List<WebElement>> searchingFunction = input -> {
        List<WebElement> result = input.findElements(By.tagName("a"));
       if (result.size() > 0) {
           return result;
        }
        return null;
};

import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.Wait;

@Test public void tezt() {
    ....
    Wait<Pattern> wait = new FluentWait<>(Pattern.compile("WEBVIEW"))
               .withTimeout(30, TimeUnit.SECONDS);
    List<WebElement> elements = wait.until(searchingFunction.compose(contextFunction));    
    ....
}

import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.Wait;

@Test public void tezt() {
    ....
    Wait<Pattern> wait = new FluentWait<>(Pattern.compile("WEBVIEW"))
               .withTimeout(30, TimeUnit.SECONDS);
    List<WebElement> elements = wait.until(contextFunction.andThen(searchingFunction));    
    ....
}

private final ActionSupplier<TouchAction> horizontalSwipe = () -> {
    driver.findElementById("io.appium.android.apis:id/gallery");

    AndroidElement gallery = driver.findElementById("io.appium.android.apis:id/gallery");
    List<MobileElement> images = gallery
                .findElementsByClassName("android.widget.ImageView");
    Point location = gallery.getLocation();
    Point center = gallery.getCenter();

    return new TouchAction(driver).press(images.get(2), -10, center.y - location.y)
                .waitAction(2000).moveTo(gallery, 10, center.y - location.y).release();
};

private final ActionSupplier<TouchAction> verticalSwiping = () ->
        new TouchAction(driver).press(driver.findElementByAccessibilityId("Gallery"))
                .waitAction(2000).moveTo(driver.findElementByAccessibilityId("Auto Complete")).release();

@Test public void tezt() {
    ...
    horizontalSwipe.get().perform();
    ...
    verticalSwiping.get().perform();   
    ...
}