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VNC server app for Android that does not require root privileges.

License: GNU General Public License v2.0

Java 83.26% CMake 0.95% C 10.16% Kotlin 5.63%
android mediaprojection remote-desktop rfb server vnc vnc-server

droidvnc-ng's Issues

OpenVPN interface not binding

If I configure ipsec in the device, I can connect via vpn ip. But if I use the openvpn client, then I cannot connect via the ip issued by the vpn server.

Not working in Samsung m30s

If you'd like to put out an incentive for fixing this bug, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

Describe the bug

App not working

To Reproduce

Expected Behavior

Show the localhost:5901 VNC server

Logs/Backtraces

Your environment (please complete the following information):

  • OS and version: Ubuntu 21.04 (hirsute)
  • VNC viewer and version: tightvncserver or tigervncserver

Additional context

File transfer not working on Android >= 9

Thank you very much for the working VNC for Android.
Tell me how to transfer files to the device?
The file system is not visible on Android 9
I am using TightVNC viewer for Windows version 1.3.10

2021-10-21_19-54

"The server is now reachable at ... :5900"

If you'd like to put out an incentive for fixing this bug, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

Describe the bug

If the user sets the port to something other than default, say 5901, a message shows that says "The server is now reachable at some.ip:5900" after hitting start. It's not actually reachable at port 5900, but rather the correct user supplied port, 5901 in this case. The incorrect
message appears right below the stop button.

Your environment (please complete the following information):

  • OS and version: A7, droidVNC version 1.2.4 from Fdroid
  • VNC viewer and version: N/A

Additional context

[Feature request] Could you create a button for background service reset cleary?

This request from a last comment of #46: pull request.
Please consider to make a button for about clean restart of background service.

Thank you for that you consider this un-common issue.
( Frankly I didn't notice "Inputs not working after some time #38" ever. :-o )

Actually i already knew your code because it was one of the 2 solutions i though about.
It would be working fine but i have a worry something.
Because i've encountered another patten of exception but not caught it exactly so..
Anyway the easy way for handling or escaping from un-handled exception might be needed i think.

For example, if droidVNC has a button explicitly for clean restart background service include every states or variables, it could be more stable when unknown exceptions occures.

Could you consider about it?

Thanks.

Originally posted by @redburn82 in #46 (comment)

On Android-X86 I get only a black (blank) screen

On a Android-X86 ( https://www.android-x86.org ) install I only get a black ( blank ) screen on the VNC viewer.
With Android-X86 anyone can easily run an Android VM on Hyper-V, it´s great for development.
I tried with Android-X86 9 and Android-X86 8.
Currently I am using Android-X86 8 ( https://osdn.net/projects/android-x86/downloads/69704/android-x86_64-8.1-r6.iso )
The mouse works in the viewer, only the screen isn't presented.
I tried with UltraVNC and RealVNC viewers on a Windows 10 with the same results.
Using RealVNC standalone X64 ( https://www.realvnc.com/download/file/viewer.files/VNC-Viewer-6.21.406-Windows-64bit.exe )
Using UltraVNC 1.2.2.4 ( can´t remember where I downloaded it, it was years ago ).
Its easy to reproduce, creating the VM and installing only driodVNC-NG, nothing more.
On the android side, droidVNC-NG seems to be working good, see attached image.
imagem_2021-09-02_093951

Accessibility using ADB

Hi,
Thanks for this app! I would like to use the server on a wierd device: a "network radio" which is a walkie talkie but Android OS on it. Accessibility service is stil in the device but left out of settings. I can only enable the service for apps using an ADB command. Would you mind letting me know the ADB command to enable Accessibilty service for DroidVNC-NG please?

Many thanks,
Phil

createVirtualDisplay throws SecurityException

If you'd like to put out an incentive for fixing this bug, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

Describe the bug

To Reproduce

no idea yet :-/

Expected Behavior

no crash

Logs/Backtraces

Your environment (please complete the following information):

  • OS and version: Android 9, 10
  • VNC viewer and version:

Additional context

java.lang.SecurityException: 
  at android.os.Parcel.createException (Parcel.java:1966)
  at android.os.Parcel.readException (Parcel.java:1934)
  at android.os.Parcel.readException (Parcel.java:1884)
  at android.hardware.display.IDisplayManager$Stub$Proxy.createVirtualDisplay (IDisplayManager.java:1106)
  at android.hardware.display.DisplayManagerGlobal.createVirtualDisplay (DisplayManagerGlobal.java:502)
  at android.hardware.display.DisplayManager.createVirtualDisplay (DisplayManager.java:1267)
  at android.media.projection.MediaProjection.createVirtualDisplay (MediaProjection.java:149)
  at net.christianbeier.droidvnc_ng.MainService.startScreenCapture (MainService.java:377)
  at net.christianbeier.droidvnc_ng.MainService.onConfigurationChanged (MainService.java:196)
  at android.app.ActivityThread.performConfigurationChanged (ActivityThread.java:5220)
  at android.app.ActivityThread.handleConfigurationChanged (ActivityThread.java:5456)
  at android.app.ActivityThread.handleConfigurationChanged (ActivityThread.java:5370)
  at android.app.servertransaction.ConfigurationChangeItem.execute (ConfigurationChangeItem.java:42)
  at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:108)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:68)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1950)
  at android.os.Handler.dispatchMessage (Handler.java:106)
  at android.os.Looper.loop (Looper.java:214)
  at android.app.ActivityThread.main (ActivityThread.java:7073)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:494)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:965)
Caused by: android.os.RemoteException: 
  at com.android.server.display.DisplayManagerService$BinderService.createVirtualDisplay (DisplayManagerService.java:2932)
  at android.hardware.display.IDisplayManager$Stub.onTransact (IDisplayManager.java:209)
  at android.os.Binder.execTransact (Binder.java:739)

Cannot unlock lock screen on Xiaomi

Describe the bug
There seem to be no way to unlock the screen using the VNC session on a Xiaomi Redmi Note 9, Android 11.
The computer Home key works to unlock the screen on a Samsung Galaxy A72, but not on the Xiaomi.

A possible cause of this behaviour is that the Xiaomi does not have a home key.
To unlock the screen on the phone, one must use the power button.

To Reproduce
Start DroidVNC / Enable accessibility & shortcuts
Start session
Lock screen
Start vncviewer on computer
Press home key (or any other for that matter, including ctrl-shift-esc), the screen stays locked.

Expected Behavior
Some key combination allows to unlock the screen on a Xiaomi Redmi Note 9.

Logs/Backtraces
n/a

Your environment (please complete the following information):
Phone: Android 11 / DroidNG 1.2.3
Desktop: Ubuntu 18.04, vncviewer: TigerVNC Viewer 64-bit v1.7.0

Additional context
A secondary problem occurs:
After I press the power key to light up the screen, still locked, I seem to be able to "swipe up", the phone screen shows the on screen keyboard, but the vncviewer window is still blank (black). Some key combination (not sure which, it does not seem consistent) allowed me to light up the vncviewer window and see the on screen keyboard, but it blanked on the phone and I was not able to interact with it.
When unlocked, I can interact with the phone.

[Question] Dealing with Screen Capture permission

Hello,

I am using this vnc server succesfully on raspberry pi 3 to be able to control/monitor an obscure device that provides access only via an android app. Thank you for this!

However, one inconvinient aspect is that whenever the android system reboots and vnc server autostarts, it asks for the Screen Capture permission by displaying a dialog box.

If the permission is not provided and we connect via VNC only a black screen is displayed.

Surprisingly despite the black screen, the window reacts to all input events via VNC, so it is acually possible, but difficult to accept the permission by clicking in the right spot. If done, then the black screen goes away and we get to see the desktop.

So my question is this, are there any means of accepting/providing this permission automatically/permanently?

Unfortunately I am not well versed with Android, but since my device has root access this should be somewhat feasable? (Either some app that can assist with it or system file modifications? or somehow running the vncserver as root?)

-- Android 10 with root (LineageOS 17)
-- Raspberry Pi 3

Add possibility to start server when usb cable is plugged in

Hi,
my phone display was broken due to water. After some time, the display came back, but I guess this was simply luck. In case you want to have a backup when display is damaged, it would help to start VNC server only when USB is connected.

Still, if someone wants the server to be started all the time, the option requested here could be disabled.

Many thanks

[Feature] "View only" mode

Hi, I would like to know if there is any way I can use the program in "view only" mode, without using the accessibility permissions, as in Android 9 Go they are usually disabled and do not allow me to run the server at startup. Really I like much this app, I want to remotely control a bunch of Android tablets from a PC, but with this problem it gets very complicated.

RemoteHostkeyboard issue

The issue is visible password for user when I control an android device by using VNC, Password typing must be hidden, like when you type a password user must see only dots. please advise me how to solve this issue.

crash w.r.t. FD_ISSET 

*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
pid: 0, tid: 0 >>> net.christianbeier.droidvnc_ng <<<

backtrace:
  #00  pc 0000000000083558  /apex/com.android.runtime/lib64/bionic/libc.so (abort+160)
  #00  pc 00000000000a9490  /apex/com.android.runtime/lib64/bionic/libc.so (__fortify_fatal(char const*, ...)+120)
  #00  pc 00000000000a9274  /apex/com.android.runtime/lib64/bionic/libc.so (__FD_ISSET_chk+92)
  #00  pc 00000000000120bc  /data/app/net.christianbeier.droidvnc_ng-43RC_mLD5hJFrhpU9S5Ong==/base.apk!libvncserver.so (offset 0xcb000)
  #00  pc 00000000000e6c10  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+36)
  #00  pc 0000000000084ee4  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64)

Wiki or FAQ: how to wake up from screensaver?

Great app. Thank you for producing the 1st ever open source remote access app that seems to be easy to install and has substantial potential.

Could I contribute to a Wiki or documentation effort to add some documentation for the basics, at least?

On first run, was not immediately obvious to me that Esc (back?) would wake up the screensaver ... without sending through an unwanted keypress whilst doing so :)

Maybe a Wiki and / or FAQ page may help?

Zoom gesture support

First let me thank you for this tool, works really good.
Using VNC for my PCs since ages, I am happy that this works rootless on android, too. There are other VNC servers on g-play, but rather spooky tools, I dont like them.
I am impressed by the speed of your droidVNC, using the camera on the remote device, the lag to the PC is really minimal.
The missing keyboard support is no big deal for me, as I just use it to support my mother on her tablet from remote.

Now my request is:
I would like to use the zoom gesture in an app on the remote device. The two finger thing.
I dont know if this is easy to implement, I would expect holding the secondary mouse button and use the mouse wheel to zoom in and out. Idk if there is a more elegant way to do that from a PC.

Start on Boot doesn't work?

Hi,

what exactly does start on boot does?
I notice despite granting project permission, the VNC server is not up after reboot.

regards,

Arya

remember previous reverseVNC connections and present them to the user

If you'd like to put out an incentive for implementing this feature, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

Is your feature request related to a problem? Please describe.
on mobile devices especially with unstable connections or if you have to frequently switch between devices, it can become really tedious (and error-prone) if you have to type in the IP every time for a reverse VNC connection.

Describe the solution you'd like
having a kind of a history or the ability to save connections (as most viewers do), would eliminate the problem - especially and even permanently, if the client has a fixed IP or uses a DDNS service.

Describe alternatives you've considered
using a DDNS service makes it less error-prone, but it's still tedious if the user has to type in the same domain over and over again.

Additional context
the icing on the cake would be something like an (additional) widget to start a particular reverse VNC connection, resulting in a "one-tap-support"! ...or perhaps just implementing it this way, could help to keep the GUI slim.

[Feature request] Please make network bindings configurable

Please consider making the network bindings of the VNC service configurable, so that one can prevent it from being exposed in potentially untrusted networks. Maybe this could be realized by a checkable list of the current networks/IP addresses (including localhost, for instance if one wants to employ some tunneling technology for making the service externally accessible).

Thanks in advance! ;-)

Interference with browser apps when accessibility for droidVNC-NG is enabled

This is very strange and I'm not sure how/why the app's accessibility option is related to other apps like browsers, but whenever I enable accessibility for droidVNC-NG through the settings, my tab groups in Firefox Chrome or Brave (I have tested both) completely disappear and I'm only left with a list of all open tabs (no groups at all). The second I disable accessibility for droidVNC-NG, I am able to interact again with my tab groups in these browsers.

Please note that this does not happen when I activate accessibility for other apps, e.g. Anydesk.

So at the moment I have the accessibility option always disabled. When I want to use droidVNC-NG, I enable it and when I am done I have to disable it again. Is this option supposed to be activated once and be left like this?

can't Install apk INSTALL_FAILED_OLDER_SDK

Can't install apk on an old phone, I got this error:

adb install droidvnc-ng-1.0.0.apk 
droidvnc-ng-1.0.0.apk: 1 file pushed. 2.9 MB/s (5347226 bytes in 1.757s)
	pkg: /data/local/tmp/droidvnc-ng-1.0.0.apk
Failure [INSTALL_FAILED_OLDER_SDK]
  • OS and version: EMUI 3.1
  • VNC viewer and version: droidvnc-ng-1.1.0.apk

I didn't find any info about requirements, so I'm not sure about minimal OS version.

built-in keyboard

The feature I want to talk about here is that this app needs a built-in keyboard so user won't just connect and see what only on the screen of the phone but only interact with the option is giving on Its screen
for example people can be texting from another device through that phone where the droidVNC is installed.

no pointer input on a rooted LineageOS 18.1 on a Raspberry Pi 4

I tried droidVNC-NG 1.0.2 on a rooted LineageOS 18.1 on a Raspberry Pi 4.
Finally a VNC-server that works on the new android 11!

Well "works" in some way: I can connect and get the screen on my Win7 or Win10 with the realVNC viewer. The keyboard shortcuts like Pos1 and ESC are working, but no mouse-input, which is more important on an android device than the home- and back-buttons.
The app on android says all three permissions granted.

Which VNC client do You use?

Will there be a android app that with root permission?

some phone like XiaoMi, OR the android 10, need to grant access every time.

but we can get root access if we want.

So, if we can provide root access for "Start on Boot", we dont need to click the screenl

grante input access for root access, so , we dont need to do this for each time.

willi you ?

Xiaomi mi a2 lite + Android 10 - black client screen

Installed, given all permissions:
Screenshot_20211229-111317
The client (RealVnc on Fedora 33) discovers the server and connects but shows just a black, empty screen:
Screenshot_2021-12-29_05-24-08
On the phone, I have a permanent notification stating "Doing some work"

Screencast without having to Grant Permissions

Request to include information in the app on how people can permanently give permission to screencast.

adb shell cmd appops set net.christianbeier.droidvnc_ng PROJECT_MEDIA allow

Including the command, and a url link to using ADB should be enough. You've done a good job of keeping the interface clean. I trust you'll keep it that way. Thank you

vnc-server reverse connection

some vnc-server support a reverse connection to vnc-client (like: winvnc.exe -connect 192.168.1.5:5900 or better with vnc-repeater winvnc.exe -id:123456 -connect 192.168.1.5:5900)
i think this would be a great enhancent and your vnc-server to an free teamviewer alternative!

app freezes when using domains for reverseVNC

If you'd like to put out an incentive for fixing this bug, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

beforehand: thank you very much @bk138 for such an awesome FOSS app!!!
i've looked so long for an FOSS no root VNC server on android... and now it popped up on fdroid, and it even has reverseVNC resp. VNCi. 👏

Describe the bug
...sadly that's also where i experience kind of a bug: as soon as i try to use a domain for reverseVNC, the app seems to freeze.

To Reproduce

  1. open droidVNC-NG
  2. start server
  3. grant permissions
  4. tap "connect to a listening viewer"
  5. enter any domain (whether with or without port) and tap "ok".
  6. see the app frozen ☹️
  7. sometimes after ~3 minutes the input field closes with a toast message that the connection failed.

Expected Behavior
reverseVNC should also work with domains, as i guess most of the time it is the point of reverseVNC to make it easier for the person with the server.
BTW: having a kind of a history or list to save reverse connections would come in handy! ...or perhaps even a widget to start a particular reverse connection (resulting in a "one-tap-support") would be absolutely brilliant!

Your environment (please complete the following information):

  • OS and version: android 7.1.2
  • VNC viewer and version: doesn't matter... it's the same for different viewers or even if you don't use any at all. 😜

Additional context
using the local IPs works like a charm, whether for a normal VNC connection or also reverseVNC (even if i try all 3 within the "same session").
BTW: interestingly i noticed the same behaviour (as described in the procedure) when i mistakenly used the IP of my router for a reverse connection.

Input ability Denied

If you'd like to put out an incentive for fixing this bug, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG

Describe the bug

I am able to launch server on my Samsung A7 tablet. However I cannot get permission to input data remotely. I allowed every accessibility except for voice but I seem to always be denied input. I have been able to enable Scren capturiing and file access

To Reproduce

Expected Behavior

I had expected to be able to click on buttons. However, the remoted mouse icon moves as expected but is unable to activate functions be cause input has been denied by the server.

Logs/Backtraces

Your environment (please complete the following information):

  • OS and version: Android 9
  • VNC viewer and version: RealVNC 3.7.1.44443

Additional context

Possible to add support for videos?

Fantastic software, thanks a lot for it!

It installs fine on a projector device of mine with Android 9, works fine - except, when I play videos (e.g. via NewPipe), then I get a black screen.

I don't really care all that much about quality, it might just as well send 1 frame per second over VNC, as long as there is a picture of the video shown, instead of just a black screen, in the VNC viewer.

Thanks again!

EDIT: Just noticed that this has to do with, whether the videos are rendering on the GPU or not. So the answer to this question is most likely "no"... I've tested this, by trying Kodi, setting it (cannot remember how exactly now) to "software rendering" somewhere - and those kind of videos do appear through droidVNC-NG on a VNC client/connection... So this is not droidVNC-NG's problem per se.

Keyboard shortcuts: Ctrl-Shift-Esc

Just wanted to note that, as of now, the keyboard shortcuts are:

https://github.com/bk138/droidVNC-NG/blob/2542f9a89884dbba2344b00c597e722ae9fa85ac/app/src/main/res/values/strings.xml

From a VNC viewer, Ctrl-Shift-Esc triggers 'Recent Apps' overview, Home/Pos1 acts as Home button, Escape acts as Back button.

However, on Windows 10, Ctrl-Shift-Esc actually starts Task manager. However, there is a workaround for TightVNC Viewer on Windows - there are actually GUI buttons in the top row, among them, Ctrl and Alt:

image

Just click on the Ctrl GUI button to toggle it, then you can [ress just Shift-Esc on keyboard, and this will arrive as Ctrl-Shift-Esc in droidVNC-NG server, trigerring Recent Apps - while not triggering the Windows Task Manager.

Android 6?

If you'd like to put out an incentive for implementing this feature, you can do so at https://issuehunt.io/r/bk138/droidVNC-NG
(I'm open to this...)

Describe the solution you'd like
Would it be possible to support Android 6?

Describe alternatives you've considered
After a lot of searching, we haven't found anything that works.

Additional context
We have industrial Android 6 devices that need basic remote support.
Must be via APK
If building for 6 means we lose a feature then that may be ok.

Inputs not working after some time

Describe the bug
No input from remote device on server device

To Reproduce
Keep an active connection, after time the server device fails to respond to inputs, but not on all devices I am operating

Expected Behavior
Inputs to be sent to device

Logs/Backtraces

Your environment (please complete the following information):

  • OS and version: Windows 11 264 & Android 11
  • VNC viewer and version: Real VNC Viewer 6.21 (and TightVNC)

Additional context
I have tried different VNC viewers and the same response
I have disconnected and re-connected and it does not resolve the issue
I have used different devices to connect, (both Android and Windows)
Only restarting the server device manually (ie physically in person) seems to solve the issue
I can still awake the screen on by pressing ctrl+esc but no other inputs are being sent once screen is awake other than esc

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