Android Nougat PhoneStateListener not starting

Question

In Android (target 25) I have a background service, and in the onCreate function, I initialized the phone status listener. It works great on versions of Android that are prior to Nougat, but on Nougat it doesn't work, although permissions are granted.

public class Service extends IntentService
{
    class PhoneListener extends PhoneStateListener
    {
       String TAG = getClass().getName();
       @Override
       public void onCallStateChanged(int state, String incomingNumber) 
       {
           super.onCallStateChanged(state, incomingNumber);
           switch (state)
           {
               case TelephonyManager.CALL_STATE_IDLE:
                Log.d(TAG,"IDLE" );
               break;
               case TelephonyManager.CALL_STATE_OFFHOOK:
                Log.d(TAG,"OFFHOOK");
               break;
               case TelephonyManager.CALL_STATE_RINGING:
                Log.d(TAG,"RINGING");
               break;
           }
       }
   }

   public Service ()
   {
       super("ChatService");
   }
   public Service(String name)
   {
       super(name);
   }

   @Override
   public void onCreate()
   {
       super.onCreate();
       TelephonyManager tm = (TelephonyManager)getApplicationContext().getSystemService(TELEPHONY_SERVICE);
       PhoneListener listener = new PhoneListener();
       tm.listen(listener,PhoneStateListener.LISTEN_CALL_STATE);
   }
}

I do not know what the problem is, it seems that the telephony manager is not registered, and therefore onCallStateChanged does not start. One of my guesses is the Doze function, which was introduced on Android M, but still ... this code works fine on Android 6, even when the phone is not found "in work"

Answer 1

, , , . BroadcastReceiver PhoneState.

, onCreate (), onStartCommand, .

, , onStartCommand, , .

, Inner PhoneListener, , onStartCommand , , , singelton.

, , Android Nougat:

public class Service extends IntentService
{
    class PhoneListener extends PhoneStateListener
    {
       String TAG = getClass().getName();
       @Override
       public void onCallStateChanged(int state, String incomingNumber) 
       {
           super.onCallStateChanged(state, incomingNumber);
           switch (state)
           {
               case TelephonyManager.CALL_STATE_IDLE:
                  Log.d(TAG,"IDLE" );
               break;
               case TelephonyManager.CALL_STATE_OFFHOOK:
                   Log.d(TAG,"OFFHOOK");
               break;
               case TelephonyManager.CALL_STATE_RINGING:
                   Log.d(TAG,"RINGING");
               break;
           }
     }
     PhoneListener phoneListener = null;

     public Service ()
     {
       super("ChatService");
     }

     @Override
     public void onCreate()
     {
        super.onCreate();
        // do what you need here
     }

     @Override
     public int onStartCommand (Intent intent, int flags, int startId)
     {
        if (phoneListener == null)
        {
          TelephonyManager tm = (TelephonyManager)getApplicationContext().getSystemService(TELEPHONY_SERVICE);
          phoneListener = new PhoneListener();
          tm.listen(listener,PhoneStateListener.LISTEN_CALL_STATE);
        }
        // do what you need to do here

        return START_STICKY; // you can set it as you want
     } 
 }

Answer 2

- PhoneStateListener, https://github.com/aosp-mirror/platform_frameworks_base/commit/f5d7c587e86c64e657a15a12ad70e75d47c48d99#diff-5af2ac899de823cf60597e554bf67fe0.

PhoneStateListener . , , . , PhoneStateListener .