将活动传递给 LifecycleObserver

Question

我需要将活动传递给 LifecycleObserver 类以执行定位任务：

class LocationObserver(
        private val context: Context,
        private val activity: FragmentActivity) : LifecycleObserver {
    
    private var locationClient: FusedLocationProviderClient? = null
    private val locationListener = OnSuccessListener { location: Location? ->
        if (location != null) {
            val lat = location.latitude
            val long = location.longitude
            ...
        }
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    fun start() {
        locationClient = LocationServices.getFusedLocationProviderClient(activity)
        ...
        locationClient?.lastLocation?.addOnSuccessListener(activity, locationListener)
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun stop() {
        locationClient = null
    }
}

LocationObserver 在片段中创建和使用：

public class LocationFragment extends Fragment {
    private LocationObserver locationObserver;
    
    public View onCreateView(@NonNull LayoutInflater inflater,
                       ViewGroup container, Bundle savedInstanceState) {
        ...
        locationObserver = new LocationObserver(this.getContext(), this.getActivity());
        getLifecycle().addObserver(locationObserver);
        
        return root;
    }
    ...
}

问题是：将活动传递给 LifecycleObserver-class 会导致内存泄漏吗？如果是这样，可能的解决方案是什么？非常感谢您的任何回答/评论！

Answer 1

如果片段位于 Activity 内，那么您的 Fragment 可能不会有更长的生命周期，因此即使您保留对活动的引用，也不会真正发生泄漏。

但是，只要您删除 LocationObserver 中的所有 Activity 引用，您就会感到非常安全。