Android - strange dot showed up - android

I restarted my phone when suddenly this showed up:
When I take a screenshot it is not included, this picture was taken using the webcam of my laptop. Anyone knows what it is and how I can remove it?

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Why Android Studio keeps showing a blue screen or getting stuck at previous changes of the app I'm developing?

Android studio is getting stuck constantly and updating or restarting pc is not helping. Sometimes the emulator would show a previous change that was made to the app, while others it would display a blue screen showing that something went wrong without showing more details. I think is not the Wi-Fi connection because I've tried it even within my university campus and the problem keeps appearing.
When these problems are showing but the blue screen is not showing, I'd notice that neither the buttons of the android emulated nor the changes made to the app would be displayed. Sometimes Android SDK and Expo would work properly without my intervention.
Can someone please illustrate me? This is interfering with my app development without it being a direct problem of my app.
Photo of the blue screen
Description of the blue screen
Also, I already searched on StackOverflow and reddit, but I don't find a current answer for this problem.

How to solve this resizing of android emulator error? I am working on vscode but emulator is showing like below

enter image description here
My emulator is showing like above, it is opening in this wide screen only. I have made a new virtual device on avd manager and changed most of the settings but I don't know how to resolve this issue.
Please let me know, thanks

Codenameone - App Crash on Android Tablet and opens a blank black screen from next time

App Crash on Android Tablet and when ever tried to open it again it open a blank black screen there after. This is happening with android debug build.I have tried to replicate the issue on simulator and it didn't happen. Please let me know if any clues about this issue. Is it something related to inefficient memory usage or something else. Is there any tool I can use to narrow down this issue. This is not happening on IOS devices and even Android Phones.

Android Studio freezes when take screenshot

I'm working on mac and my Android Studio (3.0) freezes when take screenshot of device from logcat. Just freezes and can't do anything finally force Android Studio to quit. I couldn't find anything about this issue around. Is there anyone else who faces this issue?
I faced the same issue and android studio was freezing for me when ever I try to take screenshot of take video recording, then I tried this.
When ever you take screenshot either camera or video.
When the dialog in android studio shows destination where it will save your file, change it to any other folder/location then pre-selected one.
Now click on save. It will save and work fine.
I tried the above and its working fine.

ARToolkit for Unity on Android : Camera won't start, just black screen

I've been working on a project with ARToolkit for Unity. I built it to Android APK. I then installed it to my Xiaomi device. When I run the app, it does the following :
It pops out a small square camera on the upper left corner
It shows unity animation text as usual
It then goes black forever
I've already set the permission for the app to access the phone's camera. How can I solve this matter?
Do I have to do something to get the phone's camera working? I am newbie by the way so don't go harsh on me.
Notes : I've tried to build another scene without ARToolkit to Android APK. It worked just fine and no black screen.
Sorry if my english isn't that good. Any help would be greatly appreciated, thanks before.
Just a guess... ARToolkit for Android on startup attempts to contact a web-server on the Internet to download camera parameters. I've noticed if your phone does not have Internet access, you'll see a black screen for quite a while (at least 30 seconds I've seen) until the HTTP request times out. You can see this if you run Android Studio studio and view the logs for your app. Unfortunately at the moment there appears to be no switch to turn this off. See:
http://artoolkit.org/community/forums/viewtopic.php?f=26&t=9441

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