How to use CameraX and Camera2 in android using java language? - java

How to use Camera2 and CameraX libraries to open android phone cameras faster using java programing language?
I'm using this lib implementation 'androidx.camera:camera-core:1.2.1'
I'm trying to implement camera functionality to open my phone camera using a latest library of google on the latest devices and open faster.

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I want to use Circuit by Unify messaging features inside a native Android app, being able to send messages, attachments, sharing the video camera, and everything else Circuit does, but with a native Java Android app and not a hybrid one. Is it possible?
The only SDKs supported are web (JavaScript) and iOS native. The native android SDK is being worked on and should be available later this year.

difference between the deprecated Java SDK and current Kotlin SDK for using Rocket chat in Android app

what is the difference between the deprecated Java SDK and current Kotlin SDK for using Rocket chat in Android app?
If we use the Java SDK now, which are the functionalities that are unavailable or has problems?
I want to use it for an android project which is in Java. what problems will I face if I use the DEPRECATED Java SDKs?

Android opencv Camera resolution low

So, I have implemented opencv to my android project, but when listing avaliable sizes for resolution I get the highest value of 1920x1080(im using Samsung Galaxy s6 Edge Plus). The highest resolution with default camera is 5312x2988, after that 3984x2988 and so on.
I have tried finding answer on the internet, but there is no explanation on how to do this and, if its not possible, why it isn't. Can someone help?
Im using OpenCV 3.2, Android Version 7.0
Your device does not deliver its full camera capabilities through the deprecated camera API, which is supported for backwards compatibility with legacy apps. You should use the new camera2 API to unlock higher video resolutions. While the native interface to camera2 has been introduced recently, it is still not accommodated in OpenCV. Luckily, there is a Java class that can help. An official tutorial shows how this new API can be used in your app.

Stream Video from Raspberry Pi to Android app

I am trying to stream video from a webcam on a raspberry pi to an android application. I used motion library on the raspberry pi to stream the video. This worked fine as I can see the video on my browser by navigating to http://raspberrypiIP:8081.
Question: how do I display this video on an Android app?
I went for LibVLC, but I am on windows environment and the lib cannot be built. I wanted to try GStreamer but I am not used to native libraries.
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I'm using Android Studio and I'm quite new to Android development.
I have not yet attempted to stream from Raspberry Pi to Android. However, I have streamed from Raspberry Pi to YouTube Live Events (https://www.youtube.com/my_live_events) which is easy to set up and get working.
I have also used the Android YouTube API Player API to play YouTube videos inside some of my Android apps (https://developers.google.com/youtube/android/player/).
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How to use Computer Camera in Android Emulator

I want to use my laptop camera in the Android Emulator, but the app crashes when I try to do so. Moreover, the emulator itself can't use the camera. Is there any software or SDK version that supports webcams. Currently I am using the Android Froyo 2.2 SDK.
Thanks!
I haven't tried that yet, although it sounds rather useful. You might wann check this
How to use web camera in android emulator to capture a live image?
and
Using Camera in the Android emulator
One answer says, this is only supported in the emulator starting with android ICS (4.0), but no further information is provided, so you might want to invest a little more research on this version.

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