Develop Reference

How to open multiple instances of the same fragment but with different data, one after the other?

I made several api calls from a model class of an Activity and upon receiving responses from each of them, I need to feed the data to a Fragment one after the other by invoking multiple instances of the same fragment.
Ideally, the next fragment will only be fed with data after the previous Fragment has exited (by response from a listener).
I have looked everywhere and couldn't find a solution to this problem. I have tried using AsyncTask with a CountDownLatch to block the next api response before getting an action response from the initial Fragment but after it only invoked one Fragment (I know how many fragments I should be creating) and back to normal Activity view.
Any thoughts on how to deal with this problem?

There are 2 ways for this
Create a constructor to the fragment where you pass the data when you create instances.
mFragment1 = new xFragment(dataA);
mFragment2 = new xFragment(dataB)
To use Interface and Implementation to pass data from Activity to. Check the link below
https://developer.android.com/training/basics/fragments/communicating.html

Correct architecture when accessing data from many different fragments

I am working on a Android app which have 5 fragments and some java classes.
I have to be able to read and edit an arraylist containing pojo's from across these fragments and classes. For example updating from the internet and then updating recyclerView in one of the fragments or sorting the objects in a recyclerView in one fragment and have those changes updated in the recyclerView in another fragment.
I have been looking at notifyDatasetChanged, but cannot get it right, when starting an update in the background and then wants it to update onSucceed in the active fragment.
I have been looking on RxJava with the Arraylist as observable, but once again I ran into problems when I wanted to subscribe from multiple fragments.
And of course I did a arraylist in a singleton, but I am pretty sure that is bad coding :-)

I would put the data that is going to be accessed by all of the fragments in a Service. Each Fragment can bind to the service to retrieve a reference to the data and to register a listener (you will have to make a custom one to handle the events that you are interested in) that will tell each Fragment to update its own view. Each Fragment would implement its own Adapter that would wrap the shared data that lives in the Service.

Handling dependent data between tabs in tabbed activity

I'm currently trying to switch my Android application from individual activities to fragments contained in a single tabbed activity, however, I'm running into some snags with figuring out how to pass data between them. I was originally just using intents. However, now that I'm using fragments, I'm currently storing any data I need as a field variable in my tabbed activity (As this answer outlines). I'm getting null pointer exceptions because my tabbed activity is attempting to load my first and second fragment, but my second fragment depends on a EditText value from my first fragment. Is there any way I can load these fragments one at a time, and pass my field data (and load my second fragment) when the user swipes? If there is a way, is this the best way of solving my problem? I'm very open to other suggestions. Thanks guys!!

There is a special dedicated topic for this here http://developer.android.com/training/basics/fragments/communicating.html.
I would declare two interface one in each fragment. Then implement the interface in the activity. On EditText change in the first fragment send the value to the activity and store the value in the activity in a instance variable. Then on the second fragment retrieve the value in the second activity from the activity.

Passing pointer to Activity to next Activity

I'm very new to Android programming (and Java for that matter) coming from an iOS background.
What I am trying to do, is pass a pointer to a Fragment from one Activity to another.
Basically, I have a starting activity called BeginActivity that handles a couple of Fragments for login and register screens. Once logged in, I load up the main activity of the app called TabsFragmentActivity using this code:
public void loggedIn() {
Intent intent = new Intent(this, TabsFragmentActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
this.startActivity(intent);
finish();
}
I'm using FLAG_ACTIVITY_CLEAR_TOP as I dont want the user to go back without actually logging out first.
Now the problem:
In BeginActivity I have a pointer to a fragment that holds the users data. I am using it like a singleton, that the first few view fragments can access from BeginActivity.
I need to pass this same object to the new TabsFragmentActivity before I call finish() on it.
How do I do this?
I know I can use putExtra() but I believe that is just for strings etc.. and not other Fragments.
Is there a way in the newly created TabsFragmentActivity that I can reference the BeginActivity to 'grab' the pointer?
Thanks

First of all, you should be sure about Fragments and Activity life cycle.
Fragments are designed to be reusable UI complex components. They look like activity, but you can reuse. So,you can have as many activities you need containing the same fragments, but not the same instances of these fragments.
If you just want to pass you user data for another activity you must use Bundle and putExtra(). Depending of the user data type can be necessary implements Serializable or Parcelable Interfaces, as #gheese said.
If you want to use the same UI appearence of your fragment on two or more activities, besides use Bundle and putExtra. Each activity that you want this behavior must contains a field whose is a Fragment and in the moment of starting this fragment you can use getActivity().getIntent().getExtra to get the user information and populate your fragment.

Basically you need to be able to pass your class via the intent, look at Serializable / Parcelable interfaces
This question has the answer you require
How to pass an object from one activity to another on Android

Get data from FragmentActivity with ViewPager to Fragmnet after API response

I have one FragmentActivity that holds ViewPager in which I trough custom FragmentPagerAdapter create 4 child Fragments. Fragments contain ListView in which I show data. I make a call to the web API in FragmentActivity when the response is finished; I want to notify all fragments that data is ready and fill the adapter with that data. Note that data is not available at the time of Fragment initialization.
I could save a reference to fragment when creating it and call “myFragment.hereIsYourData(Object data)”, but the reference get changed after recreating Activity when killing app for low memory. (If I’m not mistaking + I read that keeping a reference to fragment in Activity is a bad thing)
Just for clarification I can’t use “findFragmentById(id)” because ViewPager does’t expose that. I could use the “getFragmentTag” hack explained here https://stackoverflow.com/a/9744146/1025364 but I don’t want to : D.
Then I have tried to ask for data from Fragment onResume method trough interface to Activity (like explained in Developer guide), but the data is not reedy at that moment. Should I ask for data in some sort of a loop until its ready?
What is the best approach in situation like that?