Neophyte Developer Question - Java for Android App Development

First, is it possible to develop an Android app that simply replaces the clock/date on the lock screen? All I want is to have my own custom clock/date on the lock screen, and be able to open up the app and change its font and layout.
If so, where would I get started? I'm a .NET developer, but have never done Android or phone development. Doing the coding doesn't worry me. I would like to know things like how I target that widget (if that's what you'd call it). Some general guidance would be appreciated with respect to replacing this specific widget.
Thanks,
Jay

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[REQUEST][Q]

Playing around with the Consumer Preview today, I wished there was a way to make desktop apps use Metro-style tiles. Is anyone working on a program to basically make a Metro app that just links to an EXE, so people can put in custom Metro tiles instead of using the stupid ugly icons?
The live tiles thing will be hard to do, that is going to pretty much rest in the hands of the application developers. But I think within a months time someone will have a program that allows you to customize the tiles to other colors or static images. The windows theme community is going to be all over this within the next few days.

Melior aka Bada Platform-x(Wave 525)

Hello,
My name is Mr.Centurian and I am a developer or the brain behind the much awaited firmware by wave 525 users,Melior aka Bada Platform-X.
We are a group of people modifying our wave for better features and have achieved great results from our experience by now.By default,Wave 525 is not able to change Fonts and Lockscreen but our devs have found out a way of not only making the rc1 file getting accepted but also succeeded in changing the fonts and lockscreen of the phone.We are also working on the main menu modification so that we can get a main menu background but only this is the area where we haven't achieved any success.
Our basic plan is to get a main menu background by changing the defined resolution of Softkey from 240X70 to 240X400 so that it covers the whole screen but we haven't found a file that could be helpful for us.If any expert is able to guide us in this area,then it would be really helpful for our Firmware.
Also,we have encountered with a bug,the task manager doesn't load up..just a black screen comes..any help with this?
Screens are attached...Hope to receive some help
Cheers,
Centurian
Some help would be encouraged... :\

Can't Find Lockscreen Source Code building rom

I've been developing and customizing custom ROMs for a few months now, using mainly AOSP, Lineage and now I'm working on my own version of HalogenOS. But one thing has alluded me, I can't find the location of the layout of the lockscreen and how to edit it! I just want to change the font, color, size, layout etc. But I can't find it anywhere!
Any help would be greatly appreciated, thank you for reading through my problems!
Edit: I know Keyguard is associated with the lockscreen but I'm still having troubles finding the layout of the clock.

Looking for theme for lockscreen only

I'm looking for a UI theme that can be applied to my phone which would only change the lockscreen portion, and leave the rest of the existing theme (icons, homescreen, settings, phone, contacts, etc) unchanged.
I have a Samsung Galaxy S5 Neo model SM-G903W (Canada), running Android Nougat 7.0 and Samsung Experience 8.1 with TouchWiz Home 6.1.85.12. I am rooted, with TWRP.
I really dislike the standard theme lockscreen clock, which shows hours stacked on top of minutes.
The Samsung store has themes with a normal digital clock, but I don't want to change the rest of my UI, only the lockscreen. (I know I can install the new theme, then overwrite the icons and wallpaper with my old theme, but the settings menu and so forth remain with the new theme.)
Can anyone point me to a theme that only overwrites the lockscreen?
I'm talking about the clock format, not the lockscreen wallpaper (which is trivial to change).
Otherwise, is it possible to extract the lockscreen portion of a theme and install only that? It looks like Samsung themes are a closed system and development tools are hard to come by, so I'm not sure if any of the "Basic APK & Theming Thread" in the XDA-University forum is applicable. Advice on whether I can modify the theme myself would be appreciated. If this is something that would be simple to change using Sungstratum, then that could be an option.
Other ways to get a normal clock, which I have rejected:
- Install a new lockscreen app -- I'm happy with the functionality of the Samsung default lockscreen (except the ugly clock!)
- Create a permanent notification, which causes the clock to display on one line -- I don't want to have the notification
- Downgrade to Android 6 -- I'd like to stay with Nougat
- Samsung Good Lock app -- not compatible with Nougat on the S5 Neo
Thanks for any help,
Justin

Looking for theme for lockscreen only

This is actually an S5 Neo question, but something that works for the S5 may also work for me. I asked this question in the S5 Neo Q&A forum, but got no response, so I thought I'd try here.
I'm looking for a UI theme that can be applied to my phone which would only change the lockscreen portion, and leave the rest of the existing theme (icons, homescreen, settings, phone, contacts, etc) unchanged.
I have a Samsung Galaxy S5 Neo model SM-G903W (Canada), running Android Nougat 7.0 and Samsung Experience 8.1 with TouchWiz Home 6.1.85.12. I am rooted, with TWRP.
I really dislike the standard theme lockscreen clock, which shows hours stacked on top of minutes.
The Samsung store has themes with a normal digital clock, but I don't want to change the rest of my UI, only the lockscreen. (I know I can install the new theme, then overwrite the icons and wallpaper with my old theme, but the phone, contacts, settings menu and so forth remain with the new theme.)
Can anyone point me to a theme that only overwrites the lockscreen? I'm talking about the clock format, not the lockscreen wallpaper (which is trivial to change).
Otherwise, is it possible to extract the lockscreen portion of a theme and install only that? It looks like Samsung themes for Nougat are a closed system and development tools are hard to come by, so I'm not sure if any of the "Basic APK & Theming Thread" in the XDA-University forum is applicable. Advice on whether I can modify the theme myself would be appreciated. If this is something that would be simple to change using Sungstratum, then that could be an option.
An example which takes a desired set of icons from a theme package, and places it into an icon-only package, is given by this post: <https://forum.xda-developers.com/android/themes/samsung-theme-store-icon-hack-icon-theme-t3628253>. I would be grateful for guidance on doing something similar with only the lockscreen from a theme package.
Other ways to get a normal clock, which I have rejected:
- Install a new lockscreen app -- I'm happy with the functionality of the Samsung default lockscreen (except the ugly clock!)
- Create a permanent notification, which causes the clock to display on one line -- I don't want to have the notification
- Downgrade to Android 6 -- I'd like to stay with Nougat
- Samsung Good Lock app -- not compatible with Nougat on the S5 Neo
Thanks for any help,
Justin

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