PhoneStateListen | int state , String incomingNumber

I'd like to listen if there's a phone call happening while my app is in the foreground.

It was like this before but now listen() is deprecated:

In my app I m detecting the incoming calls phone number , everything working fine but when I m trying to set the phone number in the textview of main activity I m getting below errors

Errors

I have two application class which I want to combine in one, but provides two function, but I want it only one class so that I can call it on the application class in my manifest and get the App to produce both functions since i can not have two classes called on the application class in my manifest file in android studo.

I would like to put the AppController class in the App.Java class

Where I am confused is how to combine it since both extends different classes which java does not permit extending two classes in one.

Below is the App.java class

My service has a PhoneStateListener that overrides the onCellInfoChanged method. When running on Android Studio, it'll log whenever the method is called. Based on the logs, it seems that sometimes the method gets called consecutively (a couple milliseconds between logs).

I'm facing an issue with getAllCellInfo().

App has permissions needed :

here is my code :

1- listener

I'm currently working on an android application to monitor the incoming and outgoing calls from a phone and register the call info into a file, and from what I've read PhoneStateListener seems to do what I need.

The thing is I need the application to run on background and I was thinking of using a service for that, but every example I've found that uses the listener declares it in the main activity, so I'm not sure if I need to create a service for it to run on background.

For a little more context, I have specific instructions that I can't create an application to "replace" the default calling app, so there's not much use in creating a GUI (I know the app needs a main activity, but it's only functionality should be starting the monitor).

The idea I have at the moment looks something like:

I want to run my android application always in background like whatsapp,truecaller i have used all things but when device is reboot the application is stop running in background for that i have used broadcast receiver to listen boot. here is my code.

My Service

public class Myservice extends Service {

I want to get currently cell information in use for data transmit. Before Android Q, I can get it easily via getallcellinfo(). However, beginning with Android Q, this will be reported via onCellInfoChanged().

I don't need to listen on the changed of cell information, I just need the cell information at the moment that the method is called. I cannot just return ((CellInfoLte) cellInfo).getCellIdentity().getEarfcn(); inside PhoneStateListener. How to implement this?

I'm currently building a spam-call blocking app as a fun project to get better with Android development, and am running into this odd bug.

I have a Broadcast Receiver setup to listen for changes in the call state, and logic to check if the call is incoming or not, and basically end the call if the number is not in the user's contact list or a "whitelist" of approved numbers held in a database. However, even after the call has been ended, the receiver continues to be called multiple times (sometimes 8 or more times) and will often be called with Call State set as ringing (again, despite the fact that the call has been ended).

Basically, I'm trying to keep track of how many times each unknown number calls the phone, but for each single call it records it as anywhere from 2 - 6 calls.

Here is the onReceive function I have set up: