Overriding onDismiss or onCancel doesn't work in DialogFragment

Question

I've implemented a fullscreen DialogFragment exactly as it's done in the docs .

public void showDialog() {
    CustomDialogFragment newFragment = new CustomDialogFragment();
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

    fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
    fragmentTransaction.add(android.R.id.content, newFragment).addToBackStack(null).commit();
}

public class CustomDialogFragment extends DialogFragment {

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

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

    @Override
    public void onCancel(@NonNull DialogInterface dialog) {
        super.onCancel(dialog);
        // Code added her doesn't run on back press
    }
}

Note: The onCancel() and onDismiss() functions run properly if I open the fragment using show() , but that's not what I want here. Is this a bug or am I doing something wrong?

Answer 1

Add this method to show your dialog in activity:-

public void showDialog() {
    CustomDialogFragment newFragment = new CustomDialogFragment();
    newFragment.show(getSupportFragmentManager(), "show_fragment");
}

Add this style:-

<style name="FullScreenfragment" parent="Theme.AppCompat.Light.Dialog">
    <item name="android:backgroundDimEnabled">false</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:padding">0dp</item>
    <item name="android:windowIsFloating">false</item>
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowCloseOnTouchOutside">false</item>
</style>

Add this code in your CustomDialogFragment:-

@Override
public int getTheme() {
    return R.style.FullScreenfragment;
}

Answer 2

Function showDialog some problem, you can try this call show your custom dialog:

public void showDialog() {
    CustomDialogFragment newFragment = new CustomDialogFragment();
    newFragment.show(getSupportFragmentManager(), "show_dialog");
}

Text "show_dialog", you can replace text if you want

Edit: if you want full screen dialog, try this:

Add custom style:

<style name="full_screen_dialog">
    <item name="android:windowIsFloating">true</item>
</style>

And set in CustomDialog:

public class CustomDialogFragment extends DialogFragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.purchase_items, container, false);
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        return dialog;
    }

    @Override
    public void onCancel(@NonNull DialogInterface dialog) {
        super.onCancel(dialog);
    }

    @Override
    public int getTheme() {
        return R.style.full_screen_dialog;
    }

    @Override
    public void onResume() {
        super.onResume();
        if (getDialog() != null) {
            WindowManager.LayoutParams params = getDialog().getWindow().getAttributes();
            params.width = WindowManager.LayoutParams.MATCH_PARENT;
            params.height = WindowManager.LayoutParams.MATCH_PARENT;
            getDialog().getWindow().setAttributes(params);
        }
    }
}

Answer 3

So I ended up overriding the dismiss() and onDestroyView() functions in my DialogFragment to have the same behaviour while still opening it as a fragment instead of a dialog and it seems to works.

public class CustomDialogFragment extends DialogFragment {
    boolean isDismissed;
    OnCancelListener onCancelListener;

    public CustomDialogFragment(@NonNull OnCancelListener onCancelListener) {
        this.onCancelListener = onCancelListener;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.purchase_items, container, false);
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        return dialog;
    }

    @Override
    public void dismiss() {
        super.dismiss();
        this.isDismissed = true;
    }

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

        if (!this.isDismissed) {
            this.onCancelListener.onCancel();
        }
    }

    public interface OnCancelListener {
        void onCancel();
    }
}