Full Screen Dialog in Android

CreateDialog.java

FullScreenDialog dialog = new FullScreenDialog();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
dialog.show(ft, FullScreenDialog.TAG);

dialog_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

  <!-- Content here -->

</RelativeLayout>

FullScreenDialog.java

public class FullScreenDialog extends DialogFragment {
                                  
    public static final String TAG = "FullScreenDialog";

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

    @Override
    public void onStart() {
        super.onStart();

        Dialog dialog = getDialog();
        if (dialog != null) {
            int width = ViewGroup.LayoutParams.MATCH_PARENT;
            int height = ViewGroup.LayoutParams.MATCH_PARENT;
            dialog.getWindow().setLayout(width, height);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle state) {
        super.onCreateView(inflater, parent, state);

        View view = getActivity().getLayoutInflater().inflate(R.layout.dialog_layout, parent, false);
        return view;
    }
}

styles.xml

<style name="FullScreenDialogStyle" parent="android:theme">
  <item name="android:windowNoTitle">true</item>
  <item name="android:windowFullscreen">true</item>
  <item name="android:windowIsFloating">false</item>
</style>

In styles.xml, it should be parent="android:Theme".

also , on FullScreenDialog.java line: 8 , the name of the style. is wrong: correct should be
setStyle(DialogFragment.STYLE_NORMAL, R.style.FullScreenDialogStyle)

Very userful.

Not working in vivo x21

@xuciluan Have you found any alternatives for vivox21?