Unable to scroll the list of elements available in a Dropdown list for a Hybrid Mobile App

Hi,

I am trying find an element from a Dropdown list in an Hybrid App and not able to scroll the Dropdown list. Below is my code,

public static Boolean selectByText( AndroidDriver driver,String text,String path,String object) throws InterruptedException {
MobileElement dropDown = driver.findElement( By.cssSelector(path) );
System.out.println(dropDown);
dropDown.click();
Thread.sleep(1000);
List Allvalues=dropDown.findElements(By.cssSelector(object));
System.out.println(Allvalues);

	    for (MobileElement we: Allvalues) {
	    	dropDown.sendKeys( Keys.DOWN );
	        Thread.sleep(10000);
	        if (we.getText().contains( text ) ) {
        	  dropDown.findElement(By.xpath(object)).click();
        	  return true;
            }

I am giving the Element Xpath value in “object” parameter. Please help me how to scroll the dropdown and identify the object from the list

Thanks