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How does android manages the async tasks as in how are the threads managed in the background and how can i manage threads so that they follow a queue type pattern of execution in android.
AsyncTask uses a ThreadPoolExecutor combined with a LinkedBlockingQueue, so basically it will do what you want, I think. See the source code for more info.
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I have an app where there is a login page, and after logging in there is an activity where it shows the Username, a profile picture, and some other strings related to the user, that I get from a firebase database. Should the process of downloading that information be done using AsyncTask?
No. If you use firebase SDK they delegate job to background thread, so AsyncTask is not necessary.
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i'm trying to add voice code uisng MesiboUI Config but there is no affect in UI I don't know why ?
You need to implement a file handler.
See code here, it checks if the file handler is implemented or not. If not, it hides attachment buttons.
https://github.com/mesibo/ui-modules-android/blob/master/Messaging/messaging/src/main/java/com/mesibo/messaging/MessagingFragment.java#L476
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how can I create a simple app that retrieve any data from server, I am stuck I don't know how I can start if anyone can help me?
You can use ktor, which is a networking library from Jetbrains. See an example here:
https://github.com/touchlab/KaMPKit/blob/kpg/ktor_hack/shared/src/commonMain/kotlin/co/touchlab/kampkit/ktor/DogApiImpl.kt#L38
The request needs to be made on the main thread in native, just FYI.
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Today i used retrofit library in my project instead of AsyncTask because it is faster than HttpUrlConnection but i am wondering how it is faster and what mechanism they are using. I searched about that but didn't get the accurate or satisfactory answer. Please help me out to understand the concept behind it.
Async task execute serially and are single threaded by default and they will wait for last call to complete before execution of next one and designed in a way so that to avoid common errors due to parallel running threads. Retrofit is not. It sends calls parallely and use ThreadPoolExecutor.
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In which layer does Dalvik go?
It is not mentioned anywhere in documentation.
direct link to diagram
I suppose you could say it's "under" the Applications and Framework layer and the stuff in the System Server box.
Dalvik isn't a service or a HAL, so it doesn't quite fit in that diagram.