KnockOn app brings double-tap to lock to most Androids. and wake to ones with OLED displays

KnockOn app brings double-tap to lock to most Androids. and wake to ones with OLED displays
If you think that LG's Knock Code feature to lock and awake the screen with two taps in quick succession instead of fumbling for buttons is awesome, then you'll be delighted to know that you can have it on your non-LG phone, too. Provided that you have a phone with an AMOLED display, that is, as the tap-to-wake function doesn't work with LCDs.

Anyhow, the app does what it advertises - when you tap two times in a quick succession on an empty homescreen space it locks your phone, and when you double-tap on a locked screen it wakes it up (AMOLED only). In everyday usage this has proven to be somewhat faster and more convenient than finding and pressing a physical side or home key. We've already shown you how to do the tap-to-lock thingy on any Android without root, but the process is somewhat convoluted, requiring a paid NOVA launcher, and the Greenify app.

Of course, an app like KnockOn isn't without bugs and kinks, but on most phones with AMOLED panels both gestures seem to work well. With the paid Pro version you can set both actions at once, or customize the double-tap speed.

Developer: JawomoDownload: Android
Category: ToolsPrice: Free, $1.10 for the Pro version without ads

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30 Comments

1. willzzz

Posts: 36; Member since: May 27, 2015

"Most" phones have AMOLED displays? News to me.

3. Jack58221

Posts: 157; Member since: Feb 23, 2013

Was thinking the save thing. Daniel P. uses a different definition of the word most. I was excited at first thinking I could get this on my Nvidis Shield Tablet.

15. Enddo

Posts: 53; Member since: May 26, 2014

Considering Samsung sells the most smartphones(by far), saying "most" in this context is probably correct

12. tomn1ce

Posts: 247; Member since: Mar 12, 2012

He said that "in most phones with Amoled panels"....he didn't say that most phones have AMOLED panels. o_0

30. dan.mnd.sl

Posts: 1; Member since: May 28, 2016

it says most phones with AMOLED displays. not that most phones have them.

2. SupermanayrB

Posts: 1188; Member since: Mar 20, 2012

My hands are big enough to hold my Note 4 & press the power button comfortably & easily. Plus this app doesn't work on all screens, just the home screen. No thanks.

4. Zack_2014

Posts: 677; Member since: Mar 25, 2014

Seems like extra battery drain for this thing to be running in the background.

5. techguyone

Posts: 214; Member since: May 18, 2013

I don't know why LCd's can't do it, no one seems to have told Sony...

6. benno

Posts: 94; Member since: Apr 17, 2015

The app doesn't work with LCD. Sony doesn't use this app.

8. Hexa-core

Posts: 2131; Member since: Aug 11, 2015

But Xperia Z2 does this double-tap stuff..

9. benno

Posts: 94; Member since: Apr 17, 2015

Yah but they use some different method presumably. The article didn't say double tap only works on amoled they said the app only works on amoled

23. medtxa

Posts: 1655; Member since: Jun 02, 2014

On non LG phone. Double tap doesn't work when the screen is off because the touch sensor is off too. On amoled screen technically the screen is still on but only showing black screen so the capacitive sensor is still on you can give the double tap input.

7. RebelwithoutaClue

Posts: 5473; Member since: Apr 05, 2013

I'm glad knock on/off is embedded into the custom rom I'm using. While I like the power button on the rear (G3), when it's on my desk, I use the knock option. Works like a charm.

18. Hexa-core

Posts: 2131; Member since: Aug 11, 2015

But you loose the use of OIS in G3. because it'll only work with LG's native camera app.

24. RebelwithoutaClue

Posts: 5473; Member since: Apr 05, 2013

Don't care... the only pics I take are a few still shots and mostly of stuff for work

25. Hexa-core

Posts: 2131; Member since: Aug 11, 2015

Alright, man. but i freaking care for OIS! :D

27. RebelwithoutaClue

Posts: 5473; Member since: Apr 05, 2013

Lol must say that I didn't know it would loose OIS. And coming from a Nexus 5, the camera is such an improvement.

28. Jango

Posts: 369; Member since: Oct 24, 2014

Isn't knock on available on the stock LG software by default? I'm sure it was on my G2.

29. RebelwithoutaClue

Posts: 5473; Member since: Apr 05, 2013

Yes LG stock has it too :) But I don't like LG's Android

10. grimpressive

Posts: 1; Member since: Oct 23, 2015

I hope they'll try to add more gestures like Oppo/OnePlus especially to manage medias (play/pause, next, previous).

11. darthmaul

Posts: 49; Member since: Feb 04, 2015

f**ks up the S6. Uninstalled.

13. aleixps

Posts: 1; Member since: Oct 23, 2015

I see, it works by keeping the phone awake with a black screen. That's why it shouldn't be used with LCD displays, but still it's a s**tty implementation for AMOLED displays as I'm getting the IR remote floating button on my Galaxy S6 all the time, and heads-up notifications aswell.

14. nodes

Posts: 1136; Member since: Mar 06, 2014

careful using this, in the past had a Nexus 4, didn't support double-tap to wake/sleep natively, so i used a tweak like this one, and months later the digitizer half-dead. i think the KnockOn LG used in their devices have special screen/digitizer. i don't know for sure though, just a friendly reminder.

16. tokuzumi

Posts: 1757; Member since: Aug 27, 2009

Just installed it on my Nexus 6. The tap to lock isn't supported, but the tap to wake works so far. I'll give it a couple of days, and see how it effects my phone.

17. Crispin_Gatieza

Posts: 3059; Member since: Jan 23, 2014

Lumias have this feature baked in even on LCD displays. I don't get what all the hullabaloo is about.

19. Hexa-core

Posts: 2131; Member since: Aug 11, 2015

LG has this feature baked in it's flagships as well, but it's different method compared to this app.

21. Crispin_Gatieza

Posts: 3059; Member since: Jan 23, 2014

Yeah, my wife's G3 has it and the G2 before it had it as well. It should be across the board not just flagships, that was my point about the Lumias. Personally, I like BlackBerry's swipe to unlock because it's only one step.

20. flipjzn

Posts: 257; Member since: Jun 22, 2012

It's called SmartTap on Cydia.

26. player911

Posts: 11; Member since: Mar 26, 2014

No SmartTap on Cydia is a half baked solution that basically keeps the screen on all the time. That is basically why this only supports AMOLED screens because "black = off". On a standard LCD screen such as the iPhone, the entire screen is powered on all the time. A TRUE KnockOn such as all of the LG devices and I think the HTC M8 are all designed to do this. For a REAL solution, ANY Android device can enable DT2W via custom kernels. The problem is most devices aren't designed for this and will increase battery drain (not much but some). LG is the pioneer and innovator of the feature. I think they may have some special layer built into the screen itself to pick up the touches that allows the screen to stay off and not use battery.

22. player911

Posts: 11; Member since: Mar 26, 2014

"Knock off" was never a complicated thing to setup. Most launchers can Double tap to Sleep already. Knock On was always the desired feature, which requires a custom kernel. Here is how the stock LG's operate: Knock On = Double Tap to Wake Slide Down = Quick Peek Mode Knock Off = From LockScreen, HomeScreen, and StatusBar Knock Off from LockScreen and HomeScreen are just app settings. The Status Bar (allows turning the screen off from any application) requires a custom modification. Once you get used to Knock On and Off, you really can't go back to a normal button again. I have a LG phone, tablet, and watch... and a few other tablets I switch between occasionally. I find myself always tapping on the screen multiple times wondering why it doesn't come on, until I realize I am not on my LG stuff. It is probably one of the most revolutionary features to hit mobile devices in years.

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