FullScreenFragment also hide the ActionBar if exists

FullScreenFragment.java

import android.app.Dialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.DialogFragment;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

/**
 * Created by dell on 3/15/2016.
 */
public class FullScreenDialog extends DialogFragment {

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setStyle(DialogFragment.STYLE_NORMAL, android.R.style.Theme);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        Dialog dialog = getDialog();
        dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        Window w = dialog.getWindow();
        w.setBackgroundDrawable(new ColorDrawable(Color.WHITE));
        WindowManager.LayoutParams params = dialog.getWindow().getAttributes();
        params.verticalMargin = 0;
        params.horizontalMargin = 0;
        params.x=0;
        params.y = 0;
        dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        params.width= ViewGroup.LayoutParams.MATCH_PARENT;
        params.height = ViewGroup.LayoutParams.MATCH_PARENT;
        w.setGravity(Gravity.TOP| Gravity.LEFT);

        return new TextView(getActivity());
    }
}