Android: support DialogFragment with custom layout not shown

I ended up with this workaround, but I’d still want to understand WTF:

    // This is a workaround for the strange behavior of onCreateView (which doesn't show dialog's layout)
    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getContext());
        LayoutInflater inflater = LayoutInflater.from(getContext());
        View dialogView = inflater.inflate(R.layout.dialog_info_prompt, null);
        dialogBuilder.setView(dialogView);

        initSubViews(dialogView);

        populateSubViews();

        setCancelable(false);

        return dialogBuilder.create();
    }

    private void initSubViews(View rootView) {
        mTxtTitle = (TextView) rootView.findViewById(R.id.txt_dialog_title);
        mTxtMessage = (TextView) rootView.findViewById(R.id.txt_dialog_message);
        mBtnPositive = (Button) rootView.findViewById(R.id.btn_dialog_positive);
        mBtnNegative = (Button) rootView.findViewById(R.id.btn_dialog_negative);

        mBtnPositive.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
                mEventBus.post(new PromptDialogDismissedEvent(getDialogTag(), PromptDialogDismissedEvent.BUTTON_POSITIVE));
            }
        });

        mBtnNegative.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
                mEventBus.post(new PromptDialogDismissedEvent(getDialogTag(), PromptDialogDismissedEvent.BUTTON_NEGATIVE));
            }
        });
    }

    private void populateSubViews() {
        String title = getArguments().getString(ARG_TITLE);
        String message = getArguments().getString(ARG_MESSAGE);
        String positiveButtonCaption = getArguments().getString(ARG_POSITIVE_BUTTON_CAPTION);
        String negativeButtonCaption = getArguments().getString(ARG_NEGATIVE_BUTTON_CAPTION);

        mTxtTitle.setText(TextUtils.isEmpty(title) ? "" : title);
        mTxtMessage.setText(TextUtils.isEmpty(message) ? "" : message);
        mBtnPositive.setText(positiveButtonCaption);
        mBtnNegative.setText(negativeButtonCaption);
    }

Maybe a bit late, but I stumbled across this post because I had the same issue in my application. I still don’t know why it happens, but I followed this Medium article on how to setup a DialogFragment and it seems that changing the dialog’s window size on onStart might fix this issue.

styles.xml

<style name="FullScreenDialogStyle" parent="Theme.AppCompat.Dialog">
    <item name="android:windowNoTitle">true</item>
    <item name="colorPrimaryDark">@color/primary_dark</item>
    <item name="colorPrimary">@color/primary</item>

    <!-- Set this to true if you want Full Screen without status bar -->
    <item name="android:windowFullscreen">false</item>

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

    <!-- This is important! Don't forget to set window background -->
    <item name="android:windowBackground">@color/background_dialog</item>
</style>

DialogFragment

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

@Override
public void onStart() {
    super.onStart();
    Dialog dialog = getDialog();
    if (dialog == null || dialog.getWindow() == null)
        return;

    int width = 776; //Width of your dialog
    int height = 512; //Height of your dialog
    dialog.getWindow().setLayout(width, height);
}