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this is the backtrack log, it said “BluetoothPhoneService.java:775”, but my “BluetoothPhoneService”just like follow.

package com.android.server.telecom.components;

import com.android.server.telecom.TelecomSystem;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

/**
 * Bluetooth headset manager for Telecom. This class shares the call state with the bluetooth device
 * and accepts call-related commands to perform on behalf of the BT device.
 */
public final class BluetoothPhoneService extends Service implements TelecomSystem.Component {

    @Override
    public IBinder onBind(Intent intent) {
        synchronized (getTelecomSystem().getLock()) {
            return getTelecomSystem().getBluetoothPhoneServiceImpl().getBinder();
        }
    }

    @Override
    public TelecomSystem getTelecomSystem() {
        return TelecomSystem.getInstance();
    }
}

It is from AOSP, only has 42 lines, but log say it run the 775th line.
I dont know why.I also find a packages/services/Telecomm/src/com/android/server/telecom/BluetoothPhoneServiceImpl.java. Are there any relationship between them?

I want to know how to find the code form this trackback log. And is it a Android or Java characteristic ?
what is its name? Where can i learn it?

the log is follow.

2024-09-11 20:00:31.365  1263-3516  BluetoothHeadset        com.vdroid                           I  java.lang.Throwable
                                                                                                    at android.bluetooth.BluetoothHeadset.phoneStateChanged(BluetoothHeadset.java:970)
                                                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    at android.bluetooth.BluetoothPhoneService.updateInThread(BluetoothPhoneService.java:429)
                                                                                                    at android.bluetooth.BluetoothPhoneService.access$800(BluetoothPhoneService.java:31)
                                                                                                    at android.bluetooth.BluetoothPhoneService$BluetoothAsyncTask.doInBackground(BluetoothPhoneService.java:775)
                                                                                                    at android.bluetooth.BluetoothPhoneService$BluetoothAsyncTask.doInBackground(BluetoothPhoneService.java:758)
                                                                                                    at android.os.AsyncTask$2.call(AsyncTask.java:333)
                                                                                                    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
                                                                                                    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
                                                                                                    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
                                                                                                    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
                                                                                                    at java.lang.Thread.run(Thread.java:764)