Android: How to have dialogFragment to fullscreen

Below solution worked perfectly for me.

Create style for Fragment Dialog like below:

<style name="dialog_theme" parent="android:Theme" >
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsFloating">false</item>
</style>

Create your java class as below:

public class FiltersDialogFragment extends android.support.v4.app.DialogFragment {

    static FiltersDialogFragment newInstance() {
        FiltersDialogFragment fragment = new FiltersDialogFragment();
        return fragment;
    }

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

    @Override
    public void onStart() {
        super.onStart();
        Dialog d = getDialog();
        if (d!=null){
            int width = ViewGroup.LayoutParams.MATCH_PARENT;
            int height = ViewGroup.LayoutParams.MATCH_PARENT;
            d.getWindow().setLayout(width, height);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.dialog_filters, container, false);
        return view;
    }
}

Happy coding!!!

You can also do something like-

@Override
  public void onCreate(@Nullable final Bundle savedInstanceState) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      setStyle(STYLE_NO_TITLE, android.R.style.Theme_Material_Light_NoActionBar_Fullscreen);
    } else {
      setStyle(STYLE_NO_TITLE, android.R.style.Theme_DeviceDefault_Light_NoActionBar);
    }
    super.onCreate(savedInstanceState);

  }

Below is my solution.

<style name="Dialog.App" parent="Theme.AppCompat.Dialog"></style>
<style name="Dialog.App.Fullscreen">
    <item name="android:windowActionBar">false</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:colorBackground">@null</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
    <item name="android:windowFrame">@null</item>
    <item name="android:windowBackground">@null</item>

    <!--the key attribute for fullscreen dialog -->
    <item name="android:windowIsFloating">false</item>

    <!-- only width fill screen -->
    <!--<item name="android:windowMinWidthMajor">100%</item>-->
    <!--<item name="android:windowMinWidthMinor">100%</item>-->
</style>

This is the solution I figured out to handle your issue:

@Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);    
        dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        return dialog;
    }

    @Override
    public void onStart() {
        super.onStart();
        Dialog dialog = getDialog();
        if (dialog != null) {
           dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
            dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        }
    }