MyLocation-sample.java

class MyLocationListener {
      public MyLocationListener(Context context, Callback callback) {
          // ...
      }

      void start() {
          // connect to system location service
      }

      void stop() {
          // disconnect from system location service
      }
  }

  class MyActivity extends AppCompatActivity {
        private MyLocationListener myLocationListener;

        @Override
        public void onCreate(...) {
            myLocationListener = new MyLocationListener(this, (location) -> {
                // update UI
            });
        }

        @Override
        public void onStart() {
            super.onStart();
            myLocationListener.start();
            // manage other components that need to respond
            // to the activity lifecycle
        }

        @Override
        public void onStop() {
            super.onStop();
            myLocationListener.stop();
            // manage other components that need to respond
            // to the activity lifecycle
        }
  }