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[APP][4.1+] Knockr - Lockscreen

After seeing a lot of comparison videos of the HTC One m8 and the Galaxy S5 I realized one of the big things HTC has is their motion launch gestures. Unfortunately for HTC it is limited to doing just a few things. So since the Galaxy S5 has an OLED screen which is turned "off" when displaying black pixels, I figured I could create something like the motion launch gestures that uses minimal battery.
So I created Knockr an app that allows users with OLED Screen devices, like the Samsung Galaxy S5 and Moto X, to quickly enter an app with gestures without having to turn the screen on.
Gestures include:
Double Tap: Double tap the screen to open any app you choose or unlock the screen
Swipe Up, Down, Left, Right: Users can set each Swipe to open a separate app or unlock the screen
Long Press: Long press the screen to open any app you choose or unlock the screen
Volume Up when in Landscape: Pressing the volume up button when the device is in Landscape will automatically open the camera
I am still working on improving some of the things in Knockr, but wanted to post it on here to get some feedback and suggestions to make it better.
Download Here​
**EDIT**
The newest update 2.1 now includes Knocks. Knocks is like LG's Knock Code. You can create multiple Knocks to unlock or open apps.
XDA:DevDB Information
Knockr, App for the Android General
Contributors
Acela1230
Version Information
Status: Beta
Created 2014-05-04
Last Updated 2014-12-01

Going to give it a try with my Galaxy S4 Mini, I hope it's not too harsh on the battery. Nevertheless this application seems like a great idea, Thank you.
EDIT: Seems to work very well. Just a few things I noticed.
-The screen can turn on by a single touch to the screen (it will then display lockscreen)
-The backlight keys turn on after the app is activated once the screen is locked (the keys are only on for a few seconds on my phone anyway, no big deal)
-Is it possible to decrease the delay between when the phone is locked and when the Knockr app is loaded/active?

Acela1230 said:
***FOR OLED SCREENS ONLY***
Click to expand...
Click to collapse
You said that this is for screens with OLED yet someone commented checking whether it would work with their S4 Mini. Now I thought that S4's had AMOLED which was different, if I'm mistaken, does this mean that it will work on my S4-19505?
Thanks, it looks brill by the way.
Nandish-

AM-(OLED) your device has an OLED display. It only works with OLED type screens cause they use no power to produce black screens.
Sent from my SAMSUNG-SM-G900A using XDA Premium HD app

Only one touch and the screen is awake to show the lock pattern on Samsung S4.

What an awesome app! My only recommendation is to take away the one tap to turn on the screen, as the screen can accidentally turn on in your pocket very easily and cause unwanted battery drain.

ViolentR said:
Going to give it a try with my Galaxy S4 Mini, I hope it's not too harsh on the battery. Nevertheless this application seems like a great idea, Thank you.
EDIT: Seems to work very well. Just a few things I noticed.
-The screen can turn on by a single touch to the screen (it will then display lockscreen)
-The backlight keys turn on after the app is activated once the screen is locked (the keys are only on for a few seconds on my phone anyway, no big deal)
-Is it possible to decrease the delay between when the phone is locked and when the Knockr app is loaded/active?
Click to expand...
Click to collapse
Thanks for the feedback. It shouldn't use much battery especially if you use the power management since you probably wont have your phone turned off to often outside of your pocket during the day and if you do you can just turn it over and still get the same benefit.
I have already uploaded a new version that has removed the single tap action so there aren't any false touches registered. It also made the screen on an option to choose for any of the gestures. It also fixes a bug that cause Knockr to close when the orientation was changed after being pocketed.
Unfortunately I don't think there is a way to load Knockr any faster since I already have it setup to load as fast as possible. The problem is that I have to use a broadcast receiver to receive the screen off and the broadcast takes a little bit of time to be sent out (I'll keep looking for ways to make it faster though).

Really cool app!
Few recommendations:
1. Any way to show clock and notifications every couple of seconds? (Ex 15s)
2. Way to bypass knockr when power button is pressed.
Thanks!
Sent from my Moto X using XDA Free mobile app

awesome app
awesome app.
but there is delay while unlocking phone (or performing any action while screen is locked).
i don't know it is because of my s3 or app
but cool idea.
one more suggestion screen should be unlocked after pressing power button.

mind blowing app.
works great.
thanks for this and keep going on.
it is really nice idea.
questions :
can it detect multi finger on screen off? we might get more gesture thts why only.
screen segmentation? means on some part of screen it detects then that gesture recognized.
just some ideas.

Awesome app. Just awesome. I didn't want to install a custom kernel just for this feature and now I don't have to. Working great at the moment. Power button is no use for unlocking but app is working with almost no hitch.
A suggestion for people who use this. Install screen on&off from play store and add that to nova launcher's double tap gesture to lock the screen. Now you can use double tap to both locking and unlocking.
Also, I have to swipe twice to open an app. Can't we do that with one swipe?
Edit: It opens with one swipe but it isn't always working. Needs some work.

Bug
found a bug :
proximity sensor always on for me on stock 4.4.2 Note 2 N7100.
whether i check power management or not.

App works on Galaxy S3, only that the proximity sensor thing for pockets, it isn't very accurate. I kinda cheated to test it, covered my sensor, then swiped left to try to launch camera, and it did. I didn't want my camera to be turned on and heating my phone in my pocket during school
Sent from my GT-I9305 using Tapatalk

I don't have a OLED lcd panel but I decided to try it. is it because I don't have a OLED panel that the screen shows black with 2 navigation buttons on it? And if that's the reason is there a way to make it work on TFT panels?

I am having this issue with my Verizon Moto X. Does it need any extra settings?

It installed on Galaxy Nexus (It is having SUPER AMOLED), when I double tap, screen wakes but shows black screen.

Cool app!
I can see navbar when i turn screen off though. And i can press power button and turn device off...
Im using a n7000 running Slimkat

underdog1799 said:
I am having this issue with my Verizon Moto X. Does it need any extra settings?
Click to expand...
Click to collapse
Same with Galaxy Nexus

pSyCh¤_O_O said:
Cool app!
I can see navbar when i turn screen off though. And i can press power button and turn device off...
Im using a n7000 running Slimkat
Click to expand...
Click to collapse
same for me
does your phone have a OLED screen?

Multi window bug
Acela1230 said:
***FOR OLED SCREENS ONLY***
After seeing a lot of comparison videos of the HTC One m8 and the Galaxy S5 I realized one of the big things HTC has is their motion launch gestures. Unfortunately for HTC it is limited to doing just a few things. So since the Galaxy S5 has an OLED screen which is turned "off" when displaying black pixels, I figured I could create something like the motion launch gestures that uses minimal battery.
So I created Knockr an app that allows users with OLED Screen devices, like the Samsung Galaxy S5 and Moto X, to quickly enter an app with gestures without having to turn the screen on.
Gestures include:
Double Tap: Double tap the screen to open any app you choose or unlock the screen
Swipe Up, Down, Left, Right: Users can set each Swipe to open a separate app or unlock the screen
Long Press: Long press the screen to open any app you choose or unlock the screen
Volume Up when in Landscape: Pressing the volume up button when the device is in Landscape will automatically open the camera
I am still working on improving some of the things in Knockr, but wanted to post it on here to get some feedback and suggestions to make it better.
Download Here​
XDA:DevDB Information
Knockr, a App for the Android General
Contributors
Acela1230
Version Information
Status: Beta
Created 2014-05-04
Last Updated 2014-05-04
Click to expand...
Click to collapse
Hey! This works very nicely! I'm having no problems so far. However, on my stock 4.4.2 Samsung Note 3 N900W8, I've noticed that if I have Multi Window on (use two apps at the same time), the multi window tab shows on the screen when Knockr becomes active. Specifically, I turn off my screen using the power button, and a second or two later the tab pops up. I don't know if this can be prevented without turning multi window off entirely, but thought I'd bring it up. Great app!

Knockon function is it possible for Mate 7?

Comming from an LG G2 phone..it is actually really hard to live a life without knock on function. (double tap to wake and turn off the screen). Is there any of the hardware that makes this impossible ? or could it be implemented in future ?
What is needed by the hardware for knockon to work ?

To switch off, it works with Xposed + Double Tap To Sleep 1.0. Do you look here.
http://forum.xda-developers.com/mate-7/themes-apps/xposed-modules-t2957769

Fooox1 said:
To switch off, it works with Xposed + Double Tap To Sleep 1.0. Do you look here.
http://forum.xda-developers.com/mate-7/themes-apps/xposed-modules-t2957769
Click to expand...
Click to collapse
is it just double tap to sleep or you can wake the phone as well?
---------- Post added at 10:11 PM ---------- Previous post was at 10:10 PM ----------
blackinfinity said:
Comming from an LG G2 phone..it is actually really hard to live a life without knock on function. (double tap to wake and turn off the screen). Is there any of the hardware that makes this impossible ? or could it be implemented in future ?
What is needed by the hardware for knockon to work ?
Click to expand...
Click to collapse
agreed, although the fingerprint scanner works like a charm it would be better with knock on when you place the phone on the desk

Wake no.

You don't need xposed. Just use a third party launcher and get screen off and lock app. Bind double tap function to the app and you're set.
Just another alternative

skade said:
You don't need xposed. Just use a third party launcher and get screen off and lock app. Bind double tap function to the app and you're set.
Just another alternative
Click to expand...
Click to collapse
To be clear..you must root your device to enable knock on function ?
I have never been rooting a device and I have no plans to do it at this point..

blackinfinity said:
To be clear..you must root your device to enable knock on function ?
I have never been rooting a device and I have no plans to do it at this point..
Click to expand...
Click to collapse
my suggestion is for screen OFF on double tap, not screen ON (aka knock on). I don't feel like rooting too so I use the fingerprint sensor to wake my device (yes its a pain if I have it on the table and just wanna see the screen but what to do if i'm not going to root..)
and when i want to turn off the screen, i use that method previously mentioned. cant comment on rooting/xposed for knock on function as I have never tried it myself.

blackinfinity said:
Comming from an LG G2 phone..it is actually really hard to live a life without knock on function. (double tap to wake and turn off the screen). Is there any of the hardware that makes this impossible ? or could it be implemented in future ?
What is needed by the hardware for knockon to work ?
Click to expand...
Click to collapse
Check app called gravity screen
And there is app In exposed fram. When u double tap u lock phone

blackinfinity said:
Comming from an LG G2 phone..it is actually really hard to live a life without knock on function. (double tap to wake and turn off the screen). Is there any of the hardware that makes this impossible ? or could it be implemented in future ?
What is needed by the hardware for knockon to work ?
Click to expand...
Click to collapse
Bro I'm just using Buzz Launcher (the best launcher experience ever for me) ... it also has gesture control ... u can set setting double tap and action lock screen ... hope this helps ... but no double to on yet .....

Yup, Nova Launcher can do double tap to turn off the screen as well. No need to root. I don't think there are any solutions at this point to double tap to turn on the screen though.

Mate does have the overlay button tool called "suspend button" much like ios & has screen off 'suspend' function but it not something I find useful by many might like it.
App like screen off & lock may be useful for a solution to screen off.
It has shortcut/widget that could be used & also can replace the google now swype up function from home key which could be a solution for some if that function works on mate 7 UI !?
Was another app that has 3 & 2 finger screen touch gesture for screen off/lock .
Power on via tap is unlikely due to lack of development & issues with exposed.
Would of liked an option on the finger print reader to be a fast double/triple tap on option if finger print security not used.
Screen off is more important to me & few options do exist that may be satisfactory.
Is something that would of been nice added (selectable option) to the bottom virtual button bar by huawei as standard !
little things like that can make a big big difference in sales & customer happiness .

double tap to wake the screen

here's a small thing I have seen on many phones that have come out in the past year or so that I was taking for granted would exist on the s7, double tapping on the screen to wake it and view your notifications.
its one of the smallest, yet most useful (I feel), little tricks that will save tons of time.
I was hoping it'd be in the "experimental" features the galaxy labs have to offer but nada.
any ideas about getting it on there and/or a way to feed this back to samsung while they still have time to implement this?

re:
"double tapping on the screen to wake it and view your notifications."
Hi
since 7.0 : you can directly go to any of the lock screen, - shown by : AOD - notifications, by clicking on any.
but if AOD is disabled, than there is no way to see them, SO a Xperia z3 like double tap to wake would be appricated

tiborprogmed said:
re:
"double tapping on the screen to wake it and view your notifications."
Hi
since 7.0 : you can directly go to any of the lock screen, - shown by : AOD - notifications, by clicking on any.
but if AOD is disabled, than there is no way to see them, SO a Xperia z3 like double tap to wake would be appricated
Click to expand...
Click to collapse
you mean its implemented in nougat so we're waiting for it?
it'd be great if we didn't have to have AOD to get that considering how simple and awesome of a feature it is...

kostas90 said:
you mean its implemented in nougat so we're waiting for it?
it'd be great if we didn't have to have AOD to get that considering how simple and awesome of a feature it is...
Click to expand...
Click to collapse
Lol must be. Lg man. It kills me that this is not on other devices yet. The one most used feature yet not on any devices but lg.
Owed loads of lgs. Still got my orig unrefirbed g4 no bootloop over a year now

TheMadScientist420 said:
Lol must be. Lg man. It kills me that this is not on other devices yet. The one most used feature yet not on any devices but lg.
Owed loads of lgs. Still got my orig unrefirbed g4 no bootloop over a year now
Click to expand...
Click to collapse
Its on other devices as well. Samsung doesn't really have it because they have physical button where others don't. But yeah, they all should have it

having physical button solves screen turn on comfortability so, why we need double tap? it's additional drain for battery

N0MA said:
having physical button solves screen turn on comfortability so, why we need double tap? it's additional drain for battery
Click to expand...
Click to collapse
It doesn't even use 1% battery in a whole battery cycle unlike aod!

Fullmetal Jun said:
It doesn't even use 1% battery in a whole battery cycle unlike aod!
Click to expand...
Click to collapse
physical button uses 0%

N0MA said:
physical button uses 0%
Click to expand...
Click to collapse
Seriously:laugh: I said less than 1% to not say 0% and for me, Double Tap is way more convenient than having to press a home button. And u could always turn double tap feature off if u don't like it, i.e, if there was ever a double tap feature!
A 'touch fingerprint button' to wake up & unlock the screen like other Androids would also be great.

Fullmetal Jun said:
Seriously:laugh: I said less than 1% to not say 0% and for me, Double Tap is way more convenient than having to press a home button. And u could always turn double tap feature off if u don't like it, i.e, if there was ever a double tap feature!
A 'touch fingerprint button' to wake up & unlock the screen like other Androids would also be great.
Click to expand...
Click to collapse
being s7's button physical, it's not able to unlock device from deep sleep, at least samsung won't include it if it's even possible and having 2tap2wake will be nonsense at this point... well i dont say it's bad feature, but i just try to explain that Sammy won't include it until we got rear mounted half-physical sensor

The KnockOn feature that LG has would never be nonsense on any phone. It is more convenient than waking with the home button. With the button you have to push a button in a specific place on the phone. With KnockOn you quickly double tap anywhere on the screen.
Sent from my SM-G935F using Tapatalk

I love LG's double tap unlock, it is most useful especially during one hand operation with these humongous 5.5in phones. It eliminates fear of dropping phone trying to reach home or power button with 1hand.

[APP] Power Button Flashlight (No Root)

Hello, i was recently experimenting with this Project: https://github.com/epeterson320/flashlight
In android studio. Its a flashlight app with no ui you just tap the icon and the flashlight activates, however i added an intent filter to the android manifest allowing the app to be launched with the "Jump to camera" gesture, this allows you to toggle the flashlight on and off with a double tap of the power button even when the screen is locked.
Instructions
Download and install
Lock phone and double tap power button
Enter your PIN or fingerprint
Select flashlight as default app
This will only work on phones that have the "Jump to camera" gesture. For example Nexus and Pixel phones, OnePlus phones and probably more. It will also replace the camera shortcut obviously. Clear defaults to select camera again.
so yeah hope someone finds this useful
Credit to @epeterson320 for creating the original app.
Download below in attached files

Thank you!!! This is amazing.

Christ this is like the one feature that's a deal breaker for me, Xposed torch is great but not seeing Xposed for android 9 yet; and this works well enough. Great thinking and thank you!

Problem
Hello. I have got a problem. Every time the phone is turned off for a longer period, when i double tap a power button camera turns on instead of flashlight. When I turn off the camera and double tam button again, flashlight works. Have anyone got this problem too? (xz1 compact, 47.2.A.8.24)
Edit: I have found out that when i remove password protection everything works

@James_Ward01 would you be willing to share your source code? I want to see if I can get the app to activate without waking the screen.

creeve4 said:
@James_Ward01 would you be willing to share your source code? I want to see if I can get the app to activate without waking the screen.
Click to expand...
Click to collapse
Hi, I will look into getting it for you, but the source code for the original app can be found here
https://github.com/epeterson320/flashlight

James_Ward01 said:
Hi, I will look into getting it for you, but the source code for the original app can be found here
https://github.com/epeterson320/flashlight
Click to expand...
Click to collapse
Thank you! I don't know how I missed the link in the OP.

creeve4 said:
Thank you! I don't know how I missed the link in the OP.
Click to expand...
Click to collapse
No problem

creeve4 said:
@James_Ward01 would you be willing to share your source code? I want to see if I can get the app to activate without waking the screen.
Click to expand...
Click to collapse
The app I have on here for download should work with the screen off as I added both android.media.action.STILL_IMAGE_CAMERA_SECURE
And android.media.action.STILL_IMAGE_CAMERA
Intent filters, the _SECURE one meaning it should work with the screen off. At least this was the case on my Nexus 6p at the time.

James_Ward01 said:
The app I have on here for download should work with the screen off as I added both android.media.action.STILL_IMAGE_CAMERA_SECURE
And android.media.action.STILL_IMAGE_CAMERA
Intent filters, the _SECURE one meaning it should work with the screen off. At least this was the case on my Nexus 6p at the time.
Click to expand...
Click to collapse
It does work with screen off. What I want to accomplish is to keep the screen off when I launch from the lockscreen. I don't want the screen to turn on when I double-press the power button. Maybe this is impossible?

creeve4 said:
It does work with screen off. What I want to accomplish is to keep the screen off when I launch from the lockscreen. I don't want the screen to turn on when I double-press the power button. Maybe this is impossible?
Click to expand...
Click to collapse
Ah, I don't know then, I'm sure it is possible one way or another but I'm afraid getting that to work is beyond me,

Couldn't get it to work with home button on S10 but works perfectly mapped to Bixby button ????

cheffy11 said:
Couldn't get it to work with home button on S10 but works perfectly mapped to Bixby button ????
Click to expand...
Click to collapse
Yes Samsung don't allow the power button to be remapped unfortunately. Glad you found a use for it though.

This works great on the pixel 5, thanks!!

Confirmed, I was using it as well on pixel 5 until now, thanks!
However, new problem :s I couldn't resist trying out Android 12 Beta 3.1 and then no power button access to flashlight anymore.

Same deal for me : Pixel 4a, was using this app daily when I was under Android 11, did the update to Android 12, not working anymore... Sad

g0t.milkk said:
Same deal for me : Pixel 4a, was using this app daily when I was under Android 11, did the update to Android 12, not working anymore... Sad
Click to expand...
Click to collapse
You could use System Power:
https://forum.xda-developers.com/t/...-simple-and-intuitive-user-interface.4248221/
Toggle Flashlight on/off : NO Root is needed

biontx said:
You could use System Power:
https://forum.xda-developers.com/t/...-simple-and-intuitive-user-interface.4248221/
Toggle Flashlight on/off : NO Root is needed
Click to expand...
Click to collapse
Sorry but I'm not sure to understand how your app may help : We're talking about enabling the flashlight using physical button shortcut.
Maybe I missed something but for me that's not what your app is doing, is it ?

Anyway, I'm using Torchie now and it kinda work : You enable it by pressing Vol+ AND Vol- at the same time, but it ONLY work when you're on the lockscreen and the screen is on.
So : "Power" to wake the screen, "Vol+ and Vol- together" to turn the light on or off
If anybody find something better, let us know. For now, this is a little cumbersome but it's working.

The Tap Tap app on GitHub works for flashlight by double tapping the back of the phone.

How to turn off and lock screen without power button or edge display lock

Hi to all of you... After five years of searching an app to turn screen off and lock without use of power button that will work with fingerprint and face I'd i finally found one to work great in playstore for free
For everyone that haven't noticed yet
https://play.google.com/store/apps/details?id=com.redmanit.lockscreen
It works great with our device and other that I have test it like S10 series, A50, 70 series

Thanks for that link.
On a contrary quest:
I'm quite into the idea of a quick shortcut app that will keep the screen ON with a quick tap.
Anyone know of a quick and easy way?