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The TelephonyManager class in the Android SDK allows you to listen for incoming phone calls and retrieve information about the call, including the phone number of the caller. Here are the steps to use the TelephonyManager class to listen for incoming phone calls:

1. In your MainActivity.java or any other activity class you want to use, import the TelephonyManager class:

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import android.telephony.TelephonyManager;


2. Get an instance of the TelephonyManager class by calling the getSystemService() method:

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TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);


3. Create a PhoneStateListener class and override the onCallStateChanged() method:

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private class MyPhoneStateListener extends PhoneStateListener {
public void onCallStateChanged(int state, String incomingNumber) {
// do something based on the call state (e.g. ringing, off-hook, idle)
// and the phone number of the caller
}
}


4. Register the PhoneStateListener to listen for call state changes by calling the listen() method on the TelephonyManager object, passing in your PhoneStateListener instance:

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tm.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);


5. In the onCallStateChanged() method, you can check the state of the call (e.g. ringing, off-hook, idle) and the phone number of the caller and take appropriate action accordingly.

You can use the phone number of the caller to compare it with the number of the calls that you have blocked, and if it matches, you can use the call blocking feature to block the call.

Note that this is a high-level overview of the process, and you may need to consider additional steps and error handling when implementing this in your app.

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