Android Studio 中的警告：可以用对方付费电话代替

Question

我最近开始使用 retrolambda 库来支持 android 开发中的 lambda，我收到了来自 Android Studio 的以下警告：

Can be replaced with collect call.

This inspection reports foreach loops which can be replaced with stream api calls.

我的代码如下：

// mGeofenceList is a List<Geofence>
mGeofenceList = new ArrayList<>();
    // GeofenceUtils.GeofenceObjects.entrySet() is a HashMap<String, LatLng>
    for (Map.Entry<String, LatLng> entry : GeofenceUtils.GeofenceObjects.entrySet()) {
        mGeofenceList.add(new Geofence.Builder()
                .setRequestId(entry.getKey())
                .setCircularRegion(
                        entry.getValue().latitude,
                        entry.getValue().longitude,
                        GeofenceUtils.GEOFENCE_RADIUS_IN_METERS)
                .setExpirationDuration(GeofenceUtils.GEOFENCE_EXPIRATION_IN_MILLISECONDS)
                .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
                        Geofence.GEOFENCE_TRANSITION_EXIT)
                .build());
    }

问：如何用对方付费电话代替？

更新：当我按下 alt+enter 时，它将代码转换为以下内容：

// method stream() cannot be found    
mGeofenceList.addAll(GeofenceUtils.GeofenceObjects.entrySet().stream()
            .map(entry -> new Geofence.Builder()
            .setRequestId(entry.getKey())
            .setCircularRegion(
                    entry.getValue().latitude,
                    entry.getValue().longitude,
                    GeofenceUtils.GEOFENCE_RADIUS_IN_METERS)
            .setExpirationDuration(GeofenceUtils.GEOFENCE_EXPIRATION_IN_MILLISECONDS)
            .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
                    Geofence.GEOFENCE_TRANSITION_EXIT)
            // Collectors cannot be found
            .build()).collect(java.util.stream.Collectors.toList()));

现在它说它无法解析方法 stream(), Collectors。它可以修复吗？我可以添加一些导入语句吗？还是 retrolambda 目前不支持？

更新：已解决，请参阅下面的答案。

Answer 1

谢谢大家在问题下发表评论。在这个库的帮助下解决了问题：https://github.com/aNNiMON/Lightweight-Stream-API

Stream.of(YourCollection) In the Java 8 implementation you’ll see YourCollection.stream(…) instead. Either way an instance of Stream is created.

此库的最终工作代码：

// stream() changed to Stream.of( ... ) as per library specs
mGeofenceList.addAll(Stream.of(GeofenceUtils.GeofenceObjects.entrySet())
                .map(entry -> new Geofence.Builder()
                .setRequestId(entry.getKey())
                .setCircularRegion(
                        entry.getValue().latitude,
                        entry.getValue().longitude,
                        GeofenceUtils.GEOFENCE_RADIUS_IN_METERS)
               .setExpirationDuration(GeofenceUtils.GEOFENCE_EXPIRATION_IN_MILLISECONDS)
               .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER | Geofence.GEOFENCE_TRANSITION_EXIT)

               // Collectors works without prefix
               .build()).collect(Collectors.toList()));

Android Studio 中的警告：可以用对方付费电话代替

Warning in Android Studio: Can be replaced with collect call

foreach

android

stream

collect

retrolambda