Android: NullRefException on creating WebView

I am trying to create a webView to layer over my main view.

     Display display = parent.getWindowManager().getDefaultDisplay();
     Point size = new Point();
     display.getSize(size);
     
     LayoutParams lp = new LinearLayout.LayoutParams((int)(size.x * 0.7f), (int)(size.y * 0.7f), Gravity.CENTER);
     
     WebView webView = new WebView(parent);
     webView.setLayoutParams(lp);

But I am getting a NullReferenceException at the line

 WebView webView = new WebView(parent);

The parent is my main activity.

Error log:

 06-11 10:44:03.110: D/Unity(18449): WeC2jetaiOI
 06-11 10:44:03.115: D/Unity(18449): Get size
 06-11 10:44:03.115: D/Unity(18449): false
 06-11 10:44:03.120: E/Unity(18449): java.lang.NullPointerException
 06-11 10:44:03.120: E/Unity(18449):  
 06-11 10:44:03.120: E/Unity(18449): (Filename: ./artifacts/generated/common/runtime/UnityEngineDebug.gen.cpp Line: 56)

The false is the check if parent is null, right before the line new WebView.