Fetching data form JSON to a list in Activity and then pass list to 3 fragment in Activity

Question

I have an Activity, and three tab each with it's own Fragments. I am loading video information from JSON into a list in Activity.

I read URL of video from list and display it in upper half of Activity layout, I have three Fragments in bottom half, the first Fragment shows info about video, second, related video, and third comments.

Problem is: I want to send the list from Activity to 3 Fragments in tabs.

I did lots of ways, using interfaces, callback,... but before fetching JSON data from url, Fragments starts and when this happens the empty list want to be set to TextViews, EditTexts, ImageViews,... in Fragment and then application stops.

How to get data from JSON and then load Fragments? Or How to simultaneously load data to Activity itself and all Fragments? Or I can fetch that JSON in activity and 3 Fragments separately, but I don't want to do that!

Please give me a tutorial or an article to learn this subject.

provide some code please. we need the activity code and the web call code at least — Pier Giorgio Misley, Sep 23 '16 at 07:54
Your question seem broad. Please shorten it and post LogCat in case of crash. Please also see - [How to create a Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve). — Sufian, Sep 23 '16 at 07:56
http://stackoverflow.com/questions/39630216/getting-data-from-json-once-and-use-it-in-3-fragment/39634164?noredirect=1#comment66600074_39634164 — Davoud, Sep 23 '16 at 07:56
@Patzu this isn't how StackOverflow works. If your question isn't getting much attention, improve it and it will get bumped. This way it will only get downvotes and get closed. — Sufian, Sep 23 '16 at 08:01

score 3 · Accepted Answer · answered Sep 23 '16 at 07:54

3

Register callback listeners in your fragments.

Load JSON data in your activity and set the corresponding data to static variables.

Now trigger callback listeners in fragments when you set values in static variables after parsing JSON.

In your callback methods in fragments set the data from static variables.

Update:

You can also pass your data in callback listeners methods to fragments instead of using static variable.

answered Sep 23 '16 at 07:54

abdul khan

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I did use this approach, I couldn't set for example a TextView with static variable while fragment was loading. – Davoud Sep 23 '16 at 07:58
you mean your data is loaded before fragments is loaded? – abdul khan Sep 23 '16 at 08:02
Yes, it worked! thanks. I will put then complete answer here. – Davoud Sep 23 '16 at 08:15
this good if it solves your problem, you should accept this answer. – abdul khan Sep 23 '16 at 09:27
Using static data is not a good approach as this may lead to memory issues. While this may seem easy approach but this certainly is not correct. You should try using interface or an event bus as mentioned in example below. – Anirudh Sharma Oct 04 '16 at 10:00

score 2 · Answer 2 · answered Sep 23 '16 at 07:58

The best approch is to achieve it through interface and put extra but if some how you are not succed you can use below methods:

1.You can use event bus for integrating this funtionality

https://github.com/greenrobot/EventBus

secondly you can do this by creating public getter setter method on parent activity and calling them on fragment by parent activity type context/object.

Fetching data form JSON to a list in Activity and then pass list to 3 fragment in Activity

2 Answers2