[英]How to properly combine multiple requests with rxjava2?
rxjava2是否有可能实现下面描述的序列? 我有类似的课程:
class Holder {
List<Image> images;
}
class Image {
String url;
String localFileUrl;
}
我需要一个类似的序列:
* Iterate over Holders;
* For each Holder iterate over Images;
* Working with each images(decode Bitmap from localFileUrl and upload
bitmap to network -> get url for image from network -> write url to
Image's file url);
* After iterating over all Holders(on this step all images inside Holders
should have filled url), make upload for Holders;
我已经尝试过类似的东西:
Observable.fromIterable(holders)
.concatMap(holder -> {
Observable.fromIterable(holder.images)
.concatMap(image -> {
// decode bitmap here
uploadImage(bitmap)
})
})
// what should I do here to get observable which emits holders,
// not result from uploadImage(bitmap)?
.toList()
.flatMap(? -> uploadeHolders());
是否可以遍历数据,对数据中的每个项目执行某些操作以及对准备好的数据做一些工作(对每个项目执行操作)?
像这样-
Observable.fromIterable(holders)
.concatMap(holder -> {
Observable.fromIterable(holder.images)
.flatMap(image -> {
// decode bitmap here
uploadImage(bitmap)
.map(url -> {
image.url = url;
return image;
});
})
.toList()
.map(list -> {
holder.images = list;
return holder;
});
})
.toList(); // optional, if you need holders as a list
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