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So I am relatively new to programming, and I have been working on this task app, where I want to save the data such as task name and more, given by the user. I am trying to accomplish this using Room. Now, initially, when I tried to do it, the app would crash since I was doing everything on the main thread probably. So, after a little research, I came to AsyncTask, but that is outdated. Now finally I have come across the Executer. I created a class for it, but I am a little unsure as to how I can implement it in my app. This is what I did :

Entity Class :

I'm developing a simple navigator with mapbox API for Android. I'm creating some routes using https://docs.mapbox.com/playground/directions/ playground and i would like to use the generated JSON to generate a DirectionsRoute object. So i call DirectionsRoute.fromJson() but when i do it, the application crashes with this error:

I'm new to android studio and i'm not sure what was going on with it. How can I solve this error?

In the logcat, it mentioned that I required a view for recycler_food_list which apparently I had already coded into the foodlistfragment.java.

Logcat

I want to use navigation bottom menu with using navHostFragment in main activity. But when I run the program ,it stops on setContent in onCreat method MainActivity java code. I try to use bindig class insted setContent directly but nothing changes.

this is MainActivity.java

I'm trying to implement an executorService to delete a huge Firebase node in background. This node gets a new record every ten seconds to feed a realtime linear graphic (259Krecords/month). The users need a function to clean the data from time to timen and they need to trigger it manually on demand.

I've coded the method below:

During one of the launches of the application, log issued such a stack of errors:

The app has:

• ListView listing player names from a DB table (only one column, so it is primary key)
• EditText to write the new name
• Button to update the name of player in the list

*there are more things, but i don´t want to make it more messy

I can click a name from the list and write a new name in the EditText. When you press the button that name is updated in the list.

Everything works correctly, but there is a problem. When I write a name that it is already in the list the app fails because primary keys cannot be repeated.

Is there some way to say "if EditText text already exists in the DB... then show a toast"

I already tried "if result of db.update is -1...then show a toast", but it doesn´t work.

This is the method in MainActivity:

I am following this tutorial to create graphs for an app I am developing, but the app keeps crashing and provides the following error message.

I have looked at all the SO posts related to this error, that I could find on Google. Most of them were about the requirement to add CHANNEL_ID in Android 8. Others were due to missing pieces of code, that I think are fixed in mine.

I have referred this article, and tried implementing the same. I am looking to send a Full Screen Intent notification.

Notifier.java