Android show DialogFragment title on API level older than 23

In your styles:

    <style name="CustomDialog" parent="@style/Theme.AppCompat.Light.Dialog">
        <item name="android:windowNoTitle">false</item>'
        <item name="android:layoutDirection">rtl</item>
        <item name="android:textDirection">rtl</item>
    </style>

If your dialog is a fragment:

MyFragment myFragment = new MyFragment();
myFragment.setStyle(DialogFragment.STYLE_NORMAL, R.style.CustomDialog);

References
https://stackoverflow.com/questions/32405042/android-dialogfragment-title-not-showing