Back button in android webview within a fragment

I have created a webview within a fragment however when I am trying to press the back button, it is killing the app instead of going back. What i want is to go back when i press the back button and if i am already on home page the back button should kill the app.

I have tried using all the solution in the given link.

How to add "Go Back" function in WebView inside Fragment?

Please help.

You can override the Activity's onBackPressed() method and check if there is any previous fragment in the backstack to pop back by calling getFragmentManager().popBackStackImmediate() or getSupportFragmentManager().popBackStackImmediate() like the code below:

@Override
public void onBackPressed() {
    if (!getFragmentManager().popBackStackImmediate()) {
        super.onBackPressed();        
    }
}

Don't forget to call .addToBackStack(null) before you call commit() to add the fragmenttransaction to the backstack.

And if you want to press back button to go back to previous webpage user has navigated in the WebView before go back to previous fragment, you can do this:

@Override
public void onBackPressed() {
    if (webView.canGoBack()) {
            webView.goBack();
    } else if (!getFragmentManager().popBackStackImmediate()) {
        super.onBackPressed();        
    }
}

And remember to set your webView to load any webpage in the WebView by calling webView.setWebViewClient(new WebViewClient());