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Stupid iOS fan boys are inventing things to trash Android again

Read a post today regarding why Android phones are so much bigger than the iPhone and it makes my blood boiled:
http://www.displayblog.com/2012/01/16/why-android-smartphones-are-bigger-than-the-iphone/
If he was true, I wouldn't complain. But that guy totally made things up by himself. It's clear that he had not done research to back up his "theory" -- he just made it up himself. Any Android users who had changed the LCD density of their devices would know that it's fairly easy to change the lppi. When a manufacturer increase the physical resolution of its device, it will adjust the LCD density to accommodate the denser display. That guy could find out the truth easily by asking around.

The article makes perfect sense to me. I for one would much rather have a smaller screen with higher pixel density.

does it really matter. you have a device and it works for you, if you read every post where somebody whines about the most trivial things then i feel sorry for you. get a life

I think I'll try to rebut this.
There are four DPI levels (MDPI is baseline):
LDPI: ~120DPI
MDPI: ~160DPI
HDPI: ~240DPI
XHDPI: ~320DPI
What this means is that when resolution increases from ~120 ppi (I prefer ppi when discussing pixel-based digital displays) to ~159 ppi fonts and icons will get smaller. This applies to all three levels of in-betweens. And displays north of ~320 ppi will continue to get smaller with no reprieve.
Click to expand...
Click to collapse
True. But manufacturers do not create screen sizes of EVERY possible density. They tend to aim for a certain density. And I don't see why they won't round up 159ppi up to 160. They wouldn't (with minor exceptions) create a screen perfectly at the middle between HDPI and MDPI, for example.
If displays size were kept at 3.2 inches from the G1, the corresponding resolutions (ppi) would be:
G1: 180.23
Nexus One: 291.55
Nexus S: 233.24
Galaxy Nexus: 458.94
Click to expand...
Click to collapse
Why would you want to convert the screen sizes to 3.2 inches first? This doesn't make sense! Oh, and I think you calculated the Nexus S wrongly.
But because Android renders text and graphics like desktop OSes (e.g. Windows, OS X) increasing resolution above 320 ppi means smaller UI elements. The display had to grow in size to compensate for shrinking UI elements. iOS renders the Retina display not by shrinking UI elements by one fourth but by doubling clarity and sharpness. Unless Google adds an additional “DPI level” beyond XHDPI, Android smartphones that match or beat the iPhone 4/4S in resolution will always be bigger, much bigger.
Click to expand...
Click to collapse
Android would never need to go past 320dpi, just like the iPhone, for it is at the verge of the human eye's visual acuity.
FYI for those who don't know, 4 copies of the UI elements are created, for each of the different display densities. So scaling up would simply mean swapping the element with the identical one of the higher density. Anything past the highest density is also past 320dpi, higher than the limit the human eye can distinguish.
UI elements created for XHDPI are usually purposefully created such that they are big enough for the density, allowing UI elements to be comfortably big enough for users.
Then why are 1280×720 Android smartphones much bigger? Because UI elements would get too small if they were much smaller than 4.5 inches.
Click to expand...
Click to collapse
There is no point of having a screen higher than 320dpi. It would be hard for one to differentiate a screen of 320dpi and 360dpi of the same size. There is no point in google trying to compete in resolution with the iPhone at this point. And besides, a manufacturer could easily release a 3.5 inch phone matching the iPhone's screen perfectly with no problems.
So there is seriously no practical point in trying to squeeze 1280x720 into a small 3.5 inch screen. I doubt manufacturers will want to try that when a 320ppi screen could do the exact same job (which by calculations, a 960x640 screen fits perfectly), without users noticing any difference. This is when resolution does not mean everything. DPI is much more important than resolution.
Disclaimer: I am not an app developer, but this is what I understand from the documentation from the android developer website.

DirkGently said:
The article makes perfect sense to me. I for one would much rather have a smaller screen with higher pixel density.
Click to expand...
Click to collapse
If what he said was true, then it made perfect sense. The problem is, he's wrong, completely. An OEM will change the ro.sf.lcd_density in build.prop to adjust the LCD density so that the font size and icon size scale up as the physical resolution increase, period. That's a fact and I have not seen a single OEM who doesn't do that. In fact, if an end user roots his device, he can change the setting himself.
No offensive to the iOS fans, but I just couldn't stand for some of them who think they know everything and keep inventing new things to praise how great their OS is, when they couldn't even get the fact right. I mean, if he's saying a 3.5" screen is the perfect size, that's one thing because it's personal preference and no one can argue that. But he wasn't doing that. He just made up a theory that is just plain wrong and present it as a fact.

5.3" device: question about cpu

Does a larger touch screen With same resolution need a faster cpu?
My doubt is about larger touch screen, not actual screen size. Would touch-scrolling run smooth With 800x480 resolution and 5.3" size?
This could be The case: use blu studio 5.3" screen With ZTE tania hw.

If the screen is of same resolution, the load on the SOC is the same.

illegaloperation said:
If the screen is of same resolution, the load on the SOC is the same.
Click to expand...
Click to collapse
Thanks. I hope bluproducts (and other minor manufacturers) will offer WP devices soon.
MS should give WP to manufacturers for free and ask a fee for xbox live/bing maps only (the way nokia is doing With its maps)

Displaying the same resolution uses the same CPU cycles regardless of physical screen size. However, a larger screen size might require a more detailed touch-sensor grid and I'm not sure if that would result in more CPU cycles or just greater battery drain (relatively speaking).

but on big screen lags are more visible!
so from user experience point, large screen devices need better CPU

PoisonWolf said:
Displaying the same resolution uses the same CPU cycles regardless of physical screen size. However, a larger screen size might require a more detailed touch-sensor grid and I'm not sure if that would result in more CPU cycles or just greater battery drain (relatively speaking).
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Click to collapse
that's exactly what I was asking.
I'd try produce a 5" WP with 1Ghz for 199 similar to the blue studio offer

Cotulla said:
but on big screen lags are more visible!
so from user experience point, large screen devices need better CPU
Click to expand...
Click to collapse
WP7 doesn't lag.
Sent from my SGH-I897

MikeyMike01 said:
WP7 doesn't lag.
Sent from my SGH-I897
Click to expand...
Click to collapse
That's right. Unfortunately ZTE didn't release a 5" WP but just another 4.3"
A 199 5" WP would sell very very well.

Unless they tweak the god damn OS to a new level with higher resolution... i don't want any kind of devices that i have to see my pictures as numerous of square pixels (visibly)
And i don't think that you would ever have WP on a tablet and 5.inch is something related to a tablet, not a phone anymore. my Titan is 4.7 inch and it has touch the lowest PPI and the size of my pocket.

Strike_Eagle said:
Unless they tweak the god damn OS to a new level with higher resolution... i don't want any kind of devices that i have to see my pictures as numerous of square pixels (visibly)
And i don't think that you would ever have WP on a tablet and 5.inch is something related to a tablet, not a phone anymore. my Titan is 4.7 inch and it has touch the lowest PPI and the size of my pocket.
Click to expand...
Click to collapse
resolution is fine imo. 10" netbooks are usually 1366x768 therefore 5" @ 800x480 are more than accettable.
regarding WP on a 5.3" tablet, why not ? you know women's purses sometimes are so small that no tablet could fit into them...

[Q] What is the right size of the Nvidia Shield Wallpaper

Hello everybody,
I have the Nvidia Shield since two days, and now, I would like to change the default wallpaper. But, I don't know what is the right size for the Nvidia Shield wallpaper. I don't think 1280x720 is the right size.
And I don't want to cut this wallpaper or that it's deformed.
I will try to find by myself, but if you know the answer, that would be nice to share it.
Thank you for all.
Best regards.

norgei said:
Hello everybody,
I have the Nvidia Shield since two days, and now, I would like to change the default wallpaper. But, I don't know what is the right size of the Nvidia Shield wallpaper. I don't think 1280x720 is the right size.
And i don't want to cut this wallpaper or that it's deformed.
I will try to find by myself, but if you know the answer, that would be nice to share it.
Thank you for all.
Best regards.
Click to expand...
Click to collapse
This has always pissed me off, I also would like to know the correct size...

Doodle210 said:
This has always pissed me off ...
Click to expand...
Click to collapse
Yeah, it's true.
Usually, for example, a device with a resolution of 540x960 (my Motorola Razr Maxx), the wallpaper resolution is of 1080x960.
Why? It's simple ; the screen is shared in fives (in my case) other virtual screens, to find the good resolution, you must multiply by two the width (540 in my case), what gives a finale resolution of 1080x960. I don't take into account the height.
It's the same way to find the wallpaper resolution of a device with fives virtual screens. On the other hand, with more (or less) virtual screens, I won't be able to tell you which is calculation to be made, but that shouldn't be very complicated to find it.
To come back to the resolution of the Nvidia Shield wallpaper, I applied this principle of calculation ((1280x2)x720 = 2560x720), but that doesn't function. I'm lost.

norgei said:
Yeah, it's true.
Usually, for example, a device with a resolution of 540x960 (my Motorola Razr Maxx), the wallpaper resolution is of 1080x960.
Why? It's simple ; the screen is shared in fives (in my case) other virtual screens, to find the good resolution, you must multiply by two the width (540 in my case), what gives a finale resolution of 1080x960. I don't take into account the height.
It's the same way to find the wallpaper resolution of a device with fives virtual screens. On the other hand, with more (or less) virtual screens, I won't be able to tell you which is calculation to be made, but that shouldn't be very complicated to find it.
To come back to the resolution of the Nvidia Shield wallpaper, I applied this principle of calculation ((1280x2)x720 = 2560x720), but that doesn't function. I'm lost.
Click to expand...
Click to collapse
1360x720
The width must be greater than the 1280 because of side-to-side scrolling, but height remains 720.

agrabren said:
1360x720
The width must be greater than the 1280 because of side-to-side scrolling, but height remains 720.
Click to expand...
Click to collapse
Sorry to tell you that, but why do you think this size is appropriate?
I say that because I realize by making tests which the wallpaper must rather have the dimensions close to those of a square.
But it is almost impossible for me to find good dimensions
What is the f****** problem with the dimensions of the Nvidia Shield wallpaper? I always succeeded in finding good dimensions for the wallpapers of my numbers android devices (Motorola Razr Maxx, Motorola Xoom 2 ME, Samsung Galaxy Tab 7.7, Toshiba Excite 7.7, Nook Tablet, Acer Iconia Smart).
On this blow, I dry, a little assistance would be it welcome (sorry for this expression, but I'm french, and I don't knom the appropriate expression for this felt)

I'm telling you the size of the NVIDIA wallpaper.
Sent from my One using XDA Premium HD app

agrabren said:
I'm telling you the size of the NVIDIA wallpaper.
Sent from my One using XDA Premium HD app
Click to expand...
Click to collapse
Ok, sorry, I had misunderstood .

norgei said:
Ok, sorry, I had misunderstood .
Click to expand...
Click to collapse
No problem. I also don't bother updating my signature, but I'm a technical lead for SHIELD, I personally identified the required size of wallpapers for SHIELD, and was the one who made it the default.

could i request for a link to the original default nvidia shield wallpaper that comes on the unit?
I wanna turn it into a live wallpaper with a water splash effect if someone could link me to the original image and i promise to release it in the google play store

OK i know i am bringing up an old thread sorry about that. However I got my shield and recently i have been playing around with making wallpapers. agrabren says that it is 1360x720 and he did the original, that's all fine and good however I go into photoshop, create an image 1360x720 copy it over to the shield when i am done and go to load it as the wallpaper and it wants me to crop it horribly.
so does anyone know the real size of the wallpaper or how to get the supposed 1360x720 wallpaper onto the shield?
thanks

OK now this is strange and if someone can explain i'm all ears. so i coped out the framework-res.apk (because mine isn't rooted right now) and extracted the contents of it. the original wallpaper is 1360x720, however there are 3 other default wallpapers with the following sizes as well 1600x1280, 1920x1280, and another 1360x720. now i'm curious as to the optimal size of a photo so that when i go to set it as a wallpaper i do not have to do any cropping. anyone know?
edit: i figured out the initial problem that is rotation, i always forget about that so it wants strange cropped might be the best word images. anyway not being able to get a good clean image in there i found an app that might help others, look for image 2 wallpaper if anyone else cares. it is doing a good job for me anyway.

I don't worry about the wallpaper size and just use Nova Launcher, it have a more flexible way to crop wallpapers when setting them.

I know this thread is pretty old, but I was having a problem with NSP wallpapers by not knowing this information. The reason I'm posting up in an older thread is to simply help others, and to grow the knowledge base for the Shield Portable at XDA. The proper size for a Shield Portable wallpaper should be 1280x720. I confirmed this both through trial and error, and by checking out the size of a screenshot. I hope this info is found helpful.

eksasol said:
I don't worry about the wallpaper size and just use Nova Launcher, it have a more flexible way to crop wallpapers when setting them.
Click to expand...
Click to collapse
I guess he doesn't want to use 3rd party launcher. That ruins the fun.

Are the Shield Wallpaper dimensions same in SPMC as well for backgrounds on New Build
agrabren said:
No problem. I also don't bother updating my signature, but I'm a technical lead for SHIELD, I personally identified the required size of wallpapers for SHIELD, and was the one who made it the default.
Click to expand...
Click to collapse
Sir I am new to Shield as well..maybe a week in... is this the correct dimensions as well for lets say a skin background if I was running SPMC? I am desperately trying to figure out what the best dimensions I use to save photos and add them to my builds... Any help would be greatly appreciated!! Many Thanks

[Q] Screen Resolutions???

hi everyone
I need to ask something that i was unable to find answer on internet or Google searching. I come straight to the point. It's basically a general thing about devices that i found different in aspect of screen resolution and i couldn't find difference.
There is one Android device which gives resolution of 540*960 on a 5inch LCD and there is an Android phone which gives 1080*1920 resolution on 5.1 inch LCD like S5 AND 1440*2560 resolution on 5.1 inch LCD.
I want to ask what is the difference that these resolution gives, i am currently using 540*960 resolution phone and what difference i would note by using 1080*1920 resolution? will thing appear small on it?
For example on a home screen, i have a gadget of weather, will it appear more smaller? because i didn't get the difference of resolution and their result difference.

awaisagha said:
hi everyone
I need to ask something that i was unable to find answer on internet or Google searching. I come straight to the point. It's basically a general thing about devices that i found different in aspect of screen resolution and i couldn't find difference.
There is one Android device which gives resolution of 540*960 on a 5inch LCD and there is an Android phone which gives 1080*1920 resolution on 5.1 inch LCD like S5 AND 1440*2560 resolution on 5.1 inch LCD.
I want to ask what is the difference that these resolution gives, i am currently using 540*960 resolution phone and what difference i would note by using 1080*1920 resolution? will thing appear small on it?
For example on a home screen, i have a gadget of weather, will it appear more smaller? because i didn't get the difference of resolution and their result difference.
Click to expand...
Click to collapse
firstly i can guess by the post that you are a noob but would like to help you change to pro so here it goes
the difference are
420*320 and below ldpi-small- 2-3inches - packed with 100 to 150 ppi screen
470*320and below IS mdpi - normal- 3 to 4.2 inches - packed with upto 200ppi
640*480and up IS hdpi- large-4.2 to 7 inches - packed with 200 to 300ppi
920x720and up IS qhdpi- extra large- more than 7 inches - packed with >300ppi
if that's unclear to you
try searching up screen support on google or api guidelines
if i helped hit that thanks meter
Sent from my GT-I9100 using XDA Premium 4 mobile app

rohitarora27 said:
firstly i can guess by the post that you are a noob but would like to help you change to pro so here it goes
the difference are
420*320 and below ldpi-small- 2-3inches - packed with 100 to 150 ppi screen
470*320and below IS mdpi - normal- 3 to 4.2 inches - packed with upto 200ppi
640*480and up IS hdpi- large-4.2 to 7 inches - packed with 200 to 300ppi
920x720and up IS qhdpi- extra large- more than 7 inches - packed with >300ppi
if that's unclear to you
try searching up screen support on google or api guidelines
if i helped hit that thanks meter
Sent from my GT-I9100 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
i am sorry if i sounded noob but i was unaware of these things. I was just wondering what's the difference of resolutions when the screen size is same.
From your post what i got was, that it is basically the PPI thing, which makes screen more bright and colorful etc. so more PPI is based on more resolution or pixels.
I am currently using Huawei G610s and it has 640*480 with 220ppi. I thought that resolution is same as in case of computers, the more resolution the more smaller the pixel and picture size and more desktop area. I am currently using 1680*1050. So i thought in same context and was wondering and thought to ask.

awaisagha said:
i am sorry if i sounded noob but i was unaware of these things. I was just wondering what's the difference of resolutions when the screen size is same.
From your post what i got was, that it is basically the PPI thing, which makes screen more bright and colorful etc. so more PPI is based on more resolution or pixels.
I am currently using Huawei G610s and it has 640*480 with 220ppi. I thought that resolution is same as in case of computers, the more resolution the more smaller the pixel and picture size and more desktop area. I am currently using 1680*1050. So i thought in same context and was wondering and thought to ask.
Click to expand...
Click to collapse
firstly ppi refers to the pixels per inch
it in simple words is how tightly pixels are packed in a sq inch of area on the screen . the more the ppi count the smaller each pixel gets providing you with sharper and intense quality display
also if you did not search api guidelines on google
i am here to help you
here go ahead and just go through the detailed version and i think it will solve almost all of your query
http://developer.android.com/guide/practices/screens_support.html
don't forget to hit thanks :good:

Now. Don't get concerned on how you sound. We were all like that at some point. The resolution that you have probably is around 200 DPI (depending on screen size) My phone (Xperia SP) has a 4.6 inch 1024 x 720 display AKA 720p display. In person, how they look actually matters. Anything above 300ppi is crisp and extremely sharp. A Samsung galaxy s5 has a PPI of around 400. These numbers don't really matter but if you see them in person, they really look nice. Hope I helped you.
Sent from my Xperia SP using XDA Free mobile app

[Q] Can the resolution of this phone be changed?

Hello! Was wondering if there was a way to change the resolution of the S6 from QHD down to 1080p. I've found the Nomone Resolution Changer, but I was wondering if there was a more trustworthy way about getting the resolution to get to 1080p. Long shot, but still! Recommendations, please?

Tythas said:
Hello! Was wondering if there was a way to change the resolution of the S6 from QHD down to 1080p. I've found the Nomone Resolution Changer, but I was wondering if there was a more trustworthy way about getting the resolution to get to 1080p. Long shot, but still! Recommendations, please?
Click to expand...
Click to collapse
Mind if I ask why?

entropism said:
Mind if I ask why?
Click to expand...
Click to collapse
Actually I was wondering the same thing until I remembered the fact it has a small battery and a 5.1" screen that really doesn't need the QHD resolution with such a small battery + screen

There are some apps available to change the DPI, i know that skydragon roms come pre baked with a DPI changer, but this will require root.

Stevles said:
Actually I was wondering the same thing until I remembered the fact it has a small battery and a 5.1" screen that really doesn't need the QHD resolution with such a small battery + screen
Click to expand...
Click to collapse
But that's not how it works. The phone will still have the same qHD screen, and will still have the same amount of pixels, and require the same amount of power. You're basically just changing the DPI to make everything larger, using 4 pixels to display what 1 used to.

entropism said:
But that's not how it works. The phone will still have the same qHD screen, and will still have the same amount of pixels, and require the same amount of power. You're basically just changing the DPI to make everything larger, using 4 pixels to display what 1 used to.
Click to expand...
Click to collapse
No he actually wants to change the proper resolution, not DPI.
Less resolution = Less processing power required = Less battery spent.
That being said.. OP no there isn't a way

Stevles said:
No he actually wants to change the proper resolution, not DPI.
Less resolution = Less processing power required = Less battery spent.
That being said.. OP no there isn't a way
Click to expand...
Click to collapse
Right, that's what I meant. You can't change the DPI (which would what he'd be doing) and have it magically change the physical number of pixels used.

No that's not what he's asking. He's asking this much like a TV. Instead of having it be QHD he wants it to display in 1080.
It's a clever way of thinking but that wouldn't help really. It'll still have the super pretty screen just everything would be smaller. Even if there was a way

nolimit78 said:
No that's not what he's asking. He's asking this much like a TV. Instead of having it be QHD he wants it to display in 1080.
It's a clever way of thinking but that wouldn't help really. It'll still have the super pretty screen just everything would be smaller. Even if there was a way
Click to expand...
Click to collapse
But that's the point: Even if you wanted to display in 1080, you still have the same amount of physical pixels in the screen, and the same amount of power needed to light them up. Unless, of course, you wanted to only use 1920x1080 pixels, at which point only 25% of the display would actually be lit up.

entropism said:
But that's the point: Even if you wanted to display in 1080, you still have the same amount of physical pixels in the screen, and the same amount of power needed to light them up. Unless, of course, you wanted to only use 1920x1080 pixels, at which point only 25% of the display would actually be lit up.
Click to expand...
Click to collapse
You're missing the point.
First of all, lowering the resolution would make everything appear larger. You have to lower the DPI setting in build.prop to scale things back down to the same size (or lower).
Secondly, lowering the output resolution will save battery power and increase performance because the CPU and GPU are working less. This is fact and just how computers work (the screen is not the only power draw in a phone). The amount of physical pixels in the screen is irrelevant because that will draw the same amount of power regardless of what the resolution is. (However, since the is an AMOLED screen, it will draw less power when displaying blacks due to the nature of the technology. Not that this has anything to do with the resolution discussion.)
Thirdly, the amount of power you will be saying varies. Mostly you will gain performance and power-savings while playing 3D (rendered) games. The GPU will be able to perform at a higher framerate as well as save you power. This is tested and true, although some applications will be glitchy due to poor coding. The amount of savings while on normal screens is subject to the efficiency of the SoC. I am not sire much will be gained here. Performance in these screens is said to be slightly increased, although I believe this phone probably has snappy speeds already.
Lastly, if you do this there may be a visual issue that could get on your nerves. Since you are altering the 1:1 resolution of the pixels, a blur will naturally occur. Since the screen is relatively small for the amount of pixels in it, the blur will be minimal and you will hardly notice after your eyes adjust to it.

Using Resolution Changer Pro (free app) you can set res to 1080 and dpi to 480 for a significant improvement in gaming performance. (phone doesnt heat up like frying pan anymore)
Difference in quality is completely unboticable.

Thoth33 said:
Using Resolution Changer Pro (free app) you can set res to 1080 and dpi to 480 for a significant improvement in gaming performance. (phone doesnt heat up like frying pan anymore)
Difference in quality is completely unboticable.
Click to expand...
Click to collapse
Yes after resolution changed, everything go smoother

Thoth33 said:
Using Resolution Changer Pro (free app) you can set res to 1080 and dpi to 480 for a significant improvement in gaming performance. (phone doesnt heat up like frying pan anymore)
Difference in quality is completely unboticable.
Click to expand...
Click to collapse
Hello Thoth33,
I used Resolution Changer Pro, but it didn't change the resolution!
What do I do wrong? I use Android 6.0 beta on my Galaxy S6 (SM-G920F).
It even tells me that it gets root access!

Help The Peace said:
Hello Thoth33,
I used Resolution Changer Pro, but it didn't change the resolution!
What do I do wrong? I use Android 6.0 beta on my Galaxy S6 (SM-G920F).
It even tells me that it gets root access!
Click to expand...
Click to collapse
It is required ROOT

jojoejit said:
It is required ROOT
Click to expand...
Click to collapse
I HAVE root...

Help The Peace said:
I HAVE root...
Click to expand...
Click to collapse
Resolution Changer Pro
From the description:
####### THIS APP REQUIRES ROOT AND 4.0+ #######
####### TouchWIZ launcher will behave oddly -- install an alternate launcher BEFORE trying this #######
####### Android versions LOWER than 4.2 may not fill the whole screen. #######

Theodric58 said:
Resolution Changer Pro
From the description:
####### THIS APP REQUIRES ROOT AND 4.0+ #######
####### TouchWIZ launcher will behave oddly -- install an alternate launcher BEFORE trying this #######
####### Android versions LOWER than 4.2 may not fill the whole screen. #######
Click to expand...
Click to collapse
Solved the problem via Android Terminal Emulator!!

i changed the resolution on my Galaxy S6 Active from QHD to just HD!! Did some graphics benchmarks and the results are more than 2 times those of QHD.
Oh, and I did this without ROOT.

Xa33M said:
i changed the resolution on my Galaxy S6 Active from QHD to just HD!! Did some graphics benchmarks and the results are more than 2 times those of QHD.
Oh, and I did this without ROOT.
Click to expand...
Click to collapse
How to do it without root?

MobileTechArena said:
How to do it without root?
Click to expand...
Click to collapse
You can do it via adb.
These are the 2 commands for both screen resolution and dpi
adb shell wm density (insert dpi here)
adb shell wm size (insert resolution here) && adb reboot
The reason for using both commands is that you have to use the correct dpi with your desired resolution and screen size, so that the icons and UI is neither too large nor too small, otherwise, the UI will crash
For example,
For Galaxy S6,
If you want 1080p, you have to choose 480 dpi as that is the correct dpi for a 5.1 Inch diaplay.
If you want to go back to QHD, just repeat the same commands with your stock dpi and resolution, which are
640 dpi
1440x2560 resolution && adb reboot
I did it via adb because currently there is no root for the S6 Active.