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[Q] Secondary Display FOR android

I've seen a lot of discussion on using an android device as an extended monitor for a PC, but I'd acutally like the go the other way, using a monitor as an extended display for my GS2 LTE. I've got the MHL adaptor that lets me mirror what's on my phone onto any screen with an HDMI input, but what i'd like to do is be able to use the monitor as the primary display, and then use my phone as a touchpad and pair my phone with a bluetooth keyboard. This way, I would effectively be able to use my phone as a portable workstation, with the phone screen as a touch pad and an external monitor as the display.
anyone know if this can be done?

Any way for a wired external display ?

Hi all,
Since many weeks I search for an external display (like Asus MB168B for example) who are compatible with Google Pixel for mirroring or replacing display or whatever. I use very often my Pixel like a PC with mouse and keyboard, and I'm very disapointed because I'm not able to have a better screen.
The Asus screen I've shared before is an example of what I search for, but it only have an usb-c entry and It seems to me that the Pixel haven't support for Display with his usb-c.
I've already try with Chromecast on tv, but there is a long unappreciable delay with this way.
I haven't tried Miracast because my knowledge about this method is close to nothing, but I search for. Maybe someone can tell me if it's a solution or not.
I'm thinking about found a 10-15" hdmi monitor, with integrated battery or with an usb supply - I can add an external battery to the equation -, then found a way to mirror my phone (miracast, chromecast Ultra maybe ?) on it. I want it for working so need to be usable in moving or travel.
I hope I'm understandable, sorry for my little english level :/
Thanks for any response

Ways to mirror screen on Android Q?

I've been trying various ways to mirror the phone to the TV:
- project to Windows 10 (tried 3 devices) - phone reboots or does not connect at all
- mirror to FireTV (Miracast?) - phone reboots or does not connect at all
- EzCast dongle - didn't seem to work, now the dongle is fully broken so cannot test it anymore
- USB-C hub with HDMI output - apparently there's no support for USB DP
- scrcpy via wireless adb - works but the phone heats up a lot and is a "bit" inconvenient
I didn't try a Chromecast, I gave all of mine away years ago since they were mostly useless.
Are there any other ways? Or is it just an issue with my unit and I should try a factory reset or a magisk mod?

I Chromecast to a Sony TV. YMMV.

Thanks, good to know. I just cancelled today my Stadia preorder which would've included a Chromecast. I'll just wait until a cheap one appears.
Was anyone able to mirror without Chromecast?

I was able to get mirroring working on a FireTV 4K by installing AirScreen. Nothing else that I've tried worked.

I can stream to my tv through the wifes apple tv box using a paid app called Allcast. Not ideal but better than nothing

A guide on converting smart Android devices into an Android desktop computer - With large screen and extra storage

I remember back in 2011 when I was working at Toshiba in Cyprus that they had a 10 inch Android laptop (no touchscreen), those type of devices seem to have been discontinued. On the same note, I wanted to convert my 2016 Sony Xperia Z5 compact smartphone into a desktop instead of throwing it away after it got dead zone on the touchscreen that keeps on getting worse and makes the device almost useless (The lighter piezo solution did not work for my device).
The 1st method is from videos that are available on Youtube that are not tested by me. The 2nd method is my own way that I tested on two devices. One is Running Android Lollipop 5 and one running Oreo 8. Each one has a different solution because the floating of any app option only works on Android Nougat 7 or above.
Method 1:
The below videos explain about benefit of using the dock. It requires purchasing a Dock and might only work with USB-C devices. There are many more videos available for this subject. The dock will also charge the device while in use. Tips from the 2nd method may improve some features for this method. I did not fully research this method as it can easily be researched by anyone because it is a readymade solution. You can research it further if it interests you to find out if your device will work well with this solution.
Videos on the dock solution
Method 2:
Not tested for gaming
The two devices that I tested this solution on are Sony Xperia Z1 Compact smartphone 2014 model running Android Lollipop and Sony Xperia Z5 Compact smartphone 2016 running Android Oreo Custom ROM. Both devices have been rooted for maximum features. Both devices use micro USB connection so it might work differently with charging for USB-C devices. Results may differ with different devices and different versions of Android but I believe that it will work very similarly to mine.
Flagship devices should work well and should be able to support all the below requirements for this method.
Holder
To have the camera for video chatting or close to the face then you will need a phone / tablet holder like in one of the below links.
https://www.amazon.co.uk/Gritin-Phone-Stand-Adjustable-Holder/dp/B07C3MQYQV
or
https://www.amazon.com/Phone-Holder-Gooseneck-Stand-Recording/dp/B07JM5435F
External Screen
To display the Android device onto an external screen then you will either need a screen that supports screen mirroring or a Miracast device. Miracast include Chrome cast and any other screen mirroring dongles. I tested the method with Anycast version 1 and a Chromecast knock off one, it worked well on both of them. If you get the Error HDCP then it can be solved with an internet search and a rooted device. These devices come with two modes and only one of them will work with your Android device. Mircast uses HDMI and will send the image and the sound to the connected external screen wirelessly. (Compatible with any screen that supports HDMI connection, make sure that your device has screen casting support before purchasing).
If your device does not support screen mirroring, then you will need to purchase an original Chromecast device and connect it to the screen and install Google Home on your device and configure Google Home to detect the Chromecast device to use it. Chromecast will need to be configured in network mode and both devices need to be connected to the same LAN network. (It is possible that not all Android O/S systems can support this function).
Example on connecting VIA Google Home to Chromecast video:
Google Home might also be able to cast to other supported devices. Check the internet for more information on that if needed.
Keyboard and Mouse
For this you will need an OTG cable (OTG cable converts USB to micro USB or to USB-C connection) with a standard USB hub as well as the keyboard and mouse. Or you can also get the OTG hub that is a combo between the OTG cable and the USB hub. USB Wired or wireless keyboard and mouse should work normally.
On some devices the USB mouse and key board need to be connected before the device is turned on. USB mouse and keyboard can also work in TWRP recovery.
It should also be possible to just get the OTG cable with only the wireless keyboard and mouse that need only one USB receiver connection.
If there are issues for the device to detect the Mouse & keyboard then connect them before turning on the device.
On most devices the on screen keyboard will automatically stop appearing while the USB keyboard is attached. This can be controlled from the phone settings options.
If there are issues using the external keyboard then of the apps from the below links should resolve your issue as they are made for the external keyboard.
Null Input Method - Apps on Google Play
Get rid of the soft keyboard when using your bluetooth or USB keyboard.
play.google.com
External Keyboard Helper Pro - Apps on Google Play
Take full control over your external Bluetooth or USB keyboard.
play.google.com
External Keyboard Helper Demo - Apps on Google Play
Take full control over your external Bluetooth or USB keyboard.
play.google.com
USB Storage
I tested this with USB flash drive and external USB drive and worked well with both. It is possible that not all the USB flash drives will work with the Android device. Sandisk did not work well on my devices but other models worked normally.
For USB flash drive. Connecting USB devices one by one might not work well enough. It sometimes will not work unless I connect all the devices to the USB hub and then connect it to the Android device while the device is on.
Connecting the USB external drive might need extra power. So plug the 2nd connection that comes with the external drive into either a USB device charger or a power bank. I recommend using this in all situations to avoid causing damage to the Android device. Connect the drive after the device has already loaded the O/S (The reason is explained under charging section below).
The apps in the below link are the best free app for browsing External USB devices. The app in the 1st link did not detect USB on Lollipop but it worked well on the newer Android O/S and the one in the 2nd link did not open on Oreo. So test both until satisfied. If you get the message that the drive is empty and needs formatting just ignore it and try the below apps.
https://play.google.com/store/apps/details?id=com.mobisystems.fileman&hl=en
http://www.estrongs.com/
Charging: It is not possible to charge and use the USB devices at the same time even if all are still connected (might not apply to USB-C Android devices, I don’t have one to test that on.) Connect the External USB drive that is using external power after the device is already on because it might start charging the device when the power is connected and if that happens then it will ignore the connected USB devices. It is an either or situation. Some devices have a 2nd way to charge the device, like a 2nd USB port or Qi charging (wireless charging). I was able to keep the Z1 compact charged with the 2nd option that it has.
Alternative all wireless connections
Android devices can handle 2-5 Bluetooth Devices simultaneously.
So it it possible to connect Bluetooth keyboard and mouse. Bluetooth or Wireless storage device. This will allow to keep the phone charged while it is using all the external devices.
Printing
To be able to print from your phone then you will need to use the below option
The below video will show how to print from specific printers:
Print photos from Google photos App:
Google Photos - Apps on Google Play
The home for your memories. Relive, share, and organize your photos.
play.google.com
Create and print Documents from WPS App:
WPS Office-PDF,Word,Excel,PPT - Apps on Google Play
PDF, Word, Excel, PowerPoint, Form & Notes, powerful as Microsoft Office.
play.google.com
Apps for desktop mode
There are many available in the play store but I found the below to be the best amongst them.
SecondScreen - better screen mirroring for Android
SecondScreen App from the below link needs either a rooted device or an ADB command. The ADB command will appear after installing the app and loading the profile. Multiple profiles can be created with this app. This app has several features. Some of the features include changing the resolution and density of the screen as well as reducing screen backlight. The lower the density the higher resolution will be which is to fit more things on the screen. The device might do a soft reboot when loading and unloading the profile.
https://play.google.com/store/apps/details?id=com.farmerbb.secondscreen.free&hl=en
Taskbar
The below app is only useful on Android Nougat 7 and above because it has a feature that is called freeform that allows to float any app when it is launched from this app for multitasking. It is made by the same developers that created Secondscreen and has a feature in the Secondscreen app to auto launch when the profile is loaded.
Set this app as default launcher. It does not have an option to minimize the apps to taskbar. To restore apps to freeform after being maximized then go to recent apps and click on the 1st icon on the left.
https://play.google.com/store/apps/details?id=com.farmerbb.taskbar&hl=en
For Lollipop 5 & Marshmallow 6 devices. Use the app in the below link It works on newer Android devices as well. It will creates a landscape desktop with a taskbar and launcher. It comes with its own set of apps and more apps can be added from the 2nd link which contain the additional apps. Only the apps that are provided with this program can float and to open multiple apps on the desktop at the same time.
This app will lock the screen in Landscape mode. To get out of this mode you will have to turn off the features that are turned on during the setup process. You might also need to force stop the app. That can be done from settings or by installing a specific app for that like the one in the below link.
KillApps : Close all apps running
KillApps - Close all apps - Apps on Google Play
Close all apps running in background
play.google.com
Sentio Desktop
https://play.google.com/store/apps/details?id=com.andromium.os
Sentio Apps (Lollipop, Marshmallow)
https://play.google.com/store/apps/details?id=com.sentio.apps
The below link is from the same developer and made for newer Android devices to float any app for Nougat 7 or above but it did not work for me so you can try it if you want to.
Sentio Desktop
https://play.google.com/store/apps/details?id=com.sentio.desktop
Hanna Baggili (John)

Hey. I've been working on the same goals for years now. I see you used Sentio desktop app for the desktop experience. However, Sentio seems to have gone under. Their app store entry is gone, and their website doesn't function.
What would be your best alternatives for a desktop environment setup, SW & HW? If I want a large display, I prefer to Miracast to a compatible device.
It's 2022. What would be your setup now. FWIW, I use and *older* LG V20 running Android 8, which is almost perfect for me (albeit not 'waterproof'). I have desire to upgrade to newer phones, with much more invasive versions of Android, tracking everyone and everything. Plus, screen casting (Miracast) isn't crippled as it now is in newer versions of Android.
Your choices?

I did not use all the apps for my setup that are in the guide. The provided solution is a general solution that I tested and works well.
Any app that is no longer in the Google play store can still be found online, in other non-official app store.
I did not test the solution for the later versions of Android.
From my own experience I found that the best Android version for the Android Desktop PC is Android 7.
What version of Android did you try your solutions on?
You can always check if there is a docking station for the phone that you want to use as a desktop. Take a look at YouTube videos in regards to that and consider it for your setup.
I did the conversion because I am an IT guy and lost the use of my phone. So I then converted it to a desktop and for the fun of it. I tested it on the older model that I have.

how to access phone with a broken screen?

I have a Oneplus 5 phone with a broken screen from about 4 years ago, the screen is entirely black and does not show anything, touch also does not work.
I want to mirror the device's screen to a monitor so I can set it up as an IP camera to record my cat giving birth.
I'm pretty sure I have usb debugging enabled since I last used it, so far I have tried:
1. connecting to a usb-c dock with HDMI to a monitor, but apparently Oneplus 5 does not support MHL.
2. tried using Vysor and Scrcpy, both work on my Galaxy Note 9 (main phone) but I have to unlock the phone and allow permissions to use ADB, since I don't have a working screen or touch on my Oneplus 5 this didn't go so well.
additional info that might be helpful:
I tried connecting the phone to a keyboard and entering the PIN (I'm pretty sure I remember it correctly) but I can't tell if it does anything.
the phone is functional, in fact, a tiny corner of the screen (bottom right) responds to touch and I can draw V gesture to turn on flash.
Vysor recognizes the phone, but upon clicking "view" it says: "The connected Android device requires pairing confirmation. click the "allow USB debugging" prompt on your android". but again, I don't have a working screen, and I cant have a keyboard connected to the phone and PC at the same time (unless there is a way I don't know of).
Is there any way I can get screen mirroring working on this device? it's been sitting in a drawer for 4 years waiting for this moment, I don't even care about recording my cat giving birth anymore... I just want this to work!
Any help is greatly appreciated.