How do I get it into a window?
Thanks.
I have a solution for this but it takes a few steps - not hard though - and involves downloading another app. First let me mention that you can also use MX Player in MultiWindow which may be enough for some people depending on your purposes and does not involve using another app. But if you want to have it in its own little floating window do the following.
1. From the Play Store install the app "Floating Window Shortcuts" by Aeon Time.
2. Open that app and create a shortcut to the Play Store (it will be placed on your homescreen).
3. Open the Floating Window shortcut to the Play Store and go to MX Player - you can either do this by searching for it or by looking for it in My Apps. You should already have installed MX Player on your phone.
4. When you are viewing the MX Player app in Play Store, click Open (right above the Uninstall button).
There you go, a fully functional floating MX Player window that you can place anywhere you want, resize as you want, and minimize to a floating circle. This method can also be applied to create floating windows of other apps, but not all apps. Only some will work. You will just have to try them. Go through the process above and you will find out if a particular app opens within the Floating Window or if it opens fullscreen in the background.
Once you do steps 1 and 2, all you will have to do is 3 and 4 from then on. Just click the shortcut and open the app from within the Play Store window.