I'm updating my post to give some better clarification of what I'm looking for.

Platform: Android

Language: Java

Goal: I'm looking to create an application that involves a button press that creates a "Night" mode. This "Night" mode will differ from the stock night mode in that it should remove all blue/green and only focus on the red spectrum, thus creating a red filter. Most objects would turn black, while the lighter objects would be in varies shades of red.

Problem: While my first thought, and the vast majority of suggestions for others has been to create multiple layout themes, one for normal operations and the other for "Night" mode, it doesn't solve my specific problem. The red filter needs to apply to the phones screen itself, not the application. I want to adjust the color tint of the screen, so that if the user wants to exit out of my app, to access information else where on the phone, they can without shocking their eyes with bright white light, and then re-access the app.

I have yet to find a way to access the systems color options directly. The application CF.Lumen allows the user to manual adjust RGB. or even just apply a color filter at a single touch.

I know CF.Lumen applies the red filter in two steps, it first adjusts the entire screen to greyscale first, and then displays the screen in levels of the selected color, so as not to lose detail.

As I have mentioned the current options on stackoverflow, and other places, suggest themes for affecting the application itself. I need something, that may be a little more complicated. Could someone offer some insight into which part of the android SDK I need to research regarding making adjustments to the system color itself.

can anyone help with this problem I've been having. since the last update I am now having to swipe my screen twice and then I still have to input my pin code to unlock my phone even though I have trusted devices enabled and my watch is always connected. I realise its not a huge problem and I can just change the setting but I wondered if anyone had dealt with this problem. thanks

My Android 9 MiNote7 phone keeps displaying a popup saying Authentication Error -- signin again. But it does not say where / how.. .. Is it an error for the phone or an app, in this case which? I have tried the phone's sig in on the LockScreen, and apps such as Outlook Mail, but the popup still appears. Suggestions?

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Just bought a Samsung smt510
It is taller and narrower than our other 10 inch tablets.
Is this how they are now or do they still make them like our older ones
Thanks

Hello,

I'm using Firefox in my android smartphone instead of Chrome (Chrome app is not installed), but I think that it applies the same anyways. In the past when I clicked on a link (from emails, or other apps, etc.), I got a message that said that a new tab was opened in Firefox but the system didn't switch automatically to the Firefox app. I continue clicking on links and then when I was done and I opened Firefox and all the tabs were opened for me. Recently Firefox for android was updated to ver. 79.0.5 and after the update when I click on a link the system automatically switch to Firefox. How can I set back the system so it doesn't switch to Firefox app each time I click on a link?

Regards.

Becomes too hot, like accidently swipe it on the hardware and it becomes suddenly warm..
Becareful though, I do not that side of the are much while holding on my cell too. It felt very odd and just out of the blue though.

My phone shut off. I typed in my pin, but the "enter" button won't tap. I tried turning it off and back on, but it required me to put in my pin, and I can't do that, what do I do?

Hi , i Have the samsung s9 plus SM-G965U UNLOCKED with snapdragon
The smartphone not check update help me please and i can't use sim from the united states, i live in france
THERE IS A METHOD TO UPDATE?

One UI version 1.0

Android Version 9

Baseband version G965USQS7CSJ7

Android security patch level November 1 2019

current version G965USQS7CSJ7 G965UOYN7CSJ7 G965USQS7CSJ7

Service provider SW ver.
SAOMC_SM-G965U_OYN_XAA_PP_0003
43384C5731553098
XAA/XAA/SPR

SAMSUNG OFFICIAL SOFTWARE

I have a couple of phone numbers stored for call forwarding and turning off call forwarding. The phone wants to add country codes when I dial those numbers. How do I turn off assisted dialing? I can't find anything in my phone to shut it down.

Hello,

on Nokia 1.3 I don't know how to place widgets on the start screen. When I long press the start screen no widget options are showen. Just "Screen setting" & wallpaper.

Thanks for help!

出全新行车记录仪 需要加V A13836759377

I want to have an Android phone on display and restrict to just one one demo website or webpage.

Is this possible?
Is there an app for it?

I'm guessing there must be as shops typically have locked phones in a similar fashion.

NOTE: I don't want a 'demo' mode as such - the website or web page will be used and interacted with.

Thanks.