asynctask | AsyncTask enables proper and easy use | Architecture library

I am working on a tasks app, and I have this activity that takes data from the user in the form of radio buttons. However, I don't want the user to exit the activity without filling any radio buttons. How can I go about that? I have been trying to fix this problem since forever, but got nothing yet.

This is the code for my activity :

To mitigate memory leaks we keep a weak reference of an activity in an inner class running on different thread. We check weakreference.get() is non null and then only proceed further. What if when we checked weakreference.get() was non null but garbage collection happened, do we need to check if the reference is non null again and again or am I missing something?

I have been trying to figure this out all day, as I would like to add an image depending on the outcome of the emotion may detect. Just wanted to add some some images but I'm still new to this. Can anyone help me with this one to.

btw here's my code:

I'm working on a tasks app. I am wanting to save data like task name, time, and priority in Room. I have created the required classes as well. However, whenever I try to delete any particular item from the tasks, the app crashes. I am fairly new at using Room, so please pardon me if I made a silly mistake. Please do tell if you require code from the Room's database class or dao class... This is the stack trace:

I am working on a tasks app, and I want to use Room to save my data. So I've created the 3 required classes. However, in my DAO class, my @Query statement isn't working, as it says:

Cannot resolve certain symbols

I have no idea why this is happening. Please help.

Code for subtaskdetails (the first class):

I am working on an Android App for handheld Scan Devices and want to download around 4.500 items from an MySQL database via Retrofit2 into a SQlite Database on the device; hence, when I tried to download all items at once, it slowed down the UI and froze the app up to 5 minutes; I googled a lot on how to solve the problem and couldn´t come up with a fitting solution for now; hence I tried to download the Database with 7 columns for each item - hence, around 31.500 entries in the database - in "Chunks" by iterating in a For-each loop and using .stream() and .limit() in a Background threat, like this:

I am working with a livedata<>> that's being used to poblate a recycler view which I then use to select an item from that list, and pass it down another activity.

Said recyclerview can be here seen in action:

As you might be able to see, when I click on the item "Ansiedad" I get another item "Artrosis de codo" which does not match the selected item. As long as I don't drag around the recyclerview, that's the item that will get selected, no matter where I touch on the list. As I move up or down the list, the item changes, but I've never managed to make it match the actually selected item. It always seems to select the last item on the recyclerview that can be seen without scrolling down. I've theorized that this is due to creating a new LiveData<>> when filtering, but I haven't found anything on that yet.

As it can be seen here:

I've been having this problems for days, and I don't quite find any good information on how to fix this, so I thought it's best just to ask.

Here are the classes that are connected to that recyclerview:

Activity:

I have a class which extends AsyncTask. When called, this task will download a video to internal storage and will in turn update a progress indicator. When the task is done, it will change the download button to a downloaded button (I'm using abdularis AndroidButtonProgress).

The procedure is working well, however I have a field for the download button and it's being highlighted as a memory leak:

I am trying to get the position of the item in a recycler view in order to pass it down to other activities, but after actually managing to get the item id, I found out that I'm getting a -1, therefore not getting a correct id there. What could be causing this?

The activity: