How to continue script when element is not found in selenium

Simply set the time to search for an element to implicitly short time this will cause the list to come back as null

androidDriver.manage().timeouts().implicitlyWait(2, TimeUnit.SECONDS);
List<AndroidElement> yesterdaysImage = androidDriver.findElementsById("MOBILE_PACKAGE_NAME:id/goals_item_yesterday");

(I know this is Selenium and I posted Appium, but Appium is derived from Selenium so this code is still valid)

I have tried answer of getting boolean response but as i see that could be possible only when we have set driver's timeout.

I had timeout of 20 sec and i was following above accepted answer.

So instead of only checking boolean isPresesnt = driver.findElements(by).size() > 0; I would rather suggest, additionally you must set implicit timeout for driver.

driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);

Hope this helps!!

I use C# but this is the method I use:

/// <summary>
    /// Looks to see if the passed in element is on the webpage or not. Returns true or false.
    /// </summary>
    /// <param name="by"></param>
    /// <param name="element"></param>
    /// <param name="driver"></param>
    /// <returns></returns>
    public static bool tryToFindElement(By by, out IWebElement element, IWebDriver driver)
    {
        try
        {
            element = driver.FindElement(by);
        }
        catch (NoSuchElementException)
        {
            element = null;
            return false;
        }
        return true;
    }

    /// <summary>
    /// Checks to see if the web element is displayed and enabled.
    /// </summary>
    /// <param name="element"></param>
    /// <returns></returns>
    public static bool isElementVisible(IWebElement element)
    {
        return element.Displayed && element.Enabled;
    }

I call it like this:

if (tryToFindElement(By.CssSelector("<CSS Selector>"), out element, driver))
                {
                    bool visible = isElementVisible(element);
                    if (visible == true)
                    {
                     //Do something
                    }
                }

public void sellProduct(){                          

            try {
                for(int i=0; i< 5 ;i++){
                    try {
                        if(!driver.findElements(By.xpath("/html/body/div[@class='container']/table[@class='table table-striped'][2]/tbody[@id='bought']/tr[@id="+i+"]/th[4]/button")).isEmpty())            {
                            try {
                                driver.findElement(By.xpath("/html/body/div[@class='container']/table[@class='table table-striped'][2]/tbody[@id='bought']/tr[@id="+i+"]/th[4]/button")).click();
                            } catch (NoSuchElementException e) {
                                e.printStackTrace();
                            }
                        }

                        else{
                            try {
                                System.out.println("no products to sell ");
                            } catch (NoSuchElementException e) {
                                e.printStackTrace();
                            }
                        }
                    } catch (NoSuchElementException e) {
                        e.printStackTrace();
                    }

                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

I wrote this code but keep on getting the issue target widow is already closed, I want the loop to exit when there is no web element found.

Use Exception handling block for that line of codes. try { } catch { } finally { } If the element is not found then it execute the codes in the finally block and continue to other lines of code

What you are experiencing is a fast-fail type of behavior when you use .findElement . You don't really need to use .findElements(el) to get a soft-fail behavior. What you could do is something like this instead:

protected void checkElementPresence(final WebDriver driver,final By by,final String errorMsg){
  new WebDriverWaitWithMessage(driver,10).failWith(errorMsg).until(new ExpectedCondition<Boolean>(){
    @Override public Boolean apply(    WebDriver webDriver){
      try {
        return driver.findElement(by).isDisplayed();
      }
 catch (      NoSuchElementException ignored) {
        return false;
      }
catch (      StaleElementReferenceException ignored) {
        return false;
      }
    }
  }
);

But requires this support class:

protected static class WebDriverWaitWithMessage extends WebDriverWait {

        private String message;

        public WebDriverWaitWithMessage(WebDriver driver, long timeOutInSeconds) {
            super(driver, timeOutInSeconds);
        }

        public WebDriverWait failWith(String message) {
            if (message == null || message.length() == 0) {
                throw new IllegalArgumentException("Error message must not be null nor empty");
            }
            this.message = message;
            return this;
        }

        @Override
        public <V> V until(Function<? super WebDriver, V> isTrue) {
            if (message == null) {
                return super.until(isTrue);
            } else {
                try {
                    return super.until(isTrue);
                } catch (TimeoutException e) {
                    throw new TimeoutException(message, e);
                }
            }
        }
    }

(note I haven't tried this in java, but this is how to do it in C#)

You should place the findelement in a try/catch block, so that if the element is not found you can catch the exception and do the correct thing.

It would look something like this:

try
{
    driver.FindElement(By.CssSelector("selector"));
} 
catch(NoSuchElementException)
{
    Console.WriteLine("Element does not exist!");
} 

Edit:
I will note that it looks like you are trying to implement your own webdriver wait behavior, so maybe look into the first answer here: https://stackoverflow.com/questions/11736027/webdriver-wait-for-element which explains how to wait for elements with explicit waits in Java.

Use findElements instead of findElement.

findElements will return an empty list if no matching elements are found instead of an exception.

To check that an element is present, you could try this

Boolean isPresent = driver.findElements(By.yourLocator).size() > 0

This will return true if at least one element is found and false if it does not exist.

Text copied from: https://stackoverflow.com/questions/7991522/selenium-webdriver-test-if-element-is-present

Another posbility is to use a Try/Catch construction, see this for more info: https://stackoverflow.com/questions/6521270/webdriver-check-if-an-element-exists