Locator is not working except id on the Appium for Android in WebView

Trying to do the Testing of Android Application coded in WebView. I have an app that I am trying to automate the Test Cases.

I have a login screen having Email and Password which does have id locaters. That is working fine I am able to locate elements. ITs hybrid app made with ionic. The login button does not have id locater.

So far I have tried this thing.

MobileWebBrowserFactory factory;
AndroidDriver<WebElement> appiumdriver;
WebElement LoginElement = appiumdriver.findElement(By.id("username"));
LoginElement.click();
LoginElement.sendKeys("Test");

WebElement PasswordElement = appiumdriver.findElement(By.id("password"));
PasswordElement.click();
PasswordElement.sendKeys("Test");
// Hide Keyboard
appiumdriver.hideKeyboard();
Thread.sleep(2000);

            WebElement LoginButton = appiumdriver
                    .findElementByName("end");

it giving me exception that name is not allowed locator to find all the times. I have used Android and appium drivers both.

Can any one Suggest me good libraries for this? I appreciate your help in advance.

Thanks

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