How to pass data between 2 fragments displaying on the screen?

Question

I have a Gridview filled with images, when you click in one of those images it starts a detais activity.
It's all working fine, but now I want to make a Master-Detail layout. So I created that "layout-land" folder and instead of only a gridview, it was this:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background"
tools:context=".MainActivityFragment">

<GridView
    android:id="@+id/main_grid"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:numColumns="auto_fit" />

<fragment
    android:id="@+id/fragment"
    android:name="com.example.lucas.popularmovies.DetailActivityFragment"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="2"
    tools:layout="@layout/fragment_detail" />

</LinearLayout>

Before that, I was passing the Details' data as an Extra of the intent and retrieving it in the Fragment.
But when I'm displaying it all in the same screen, how do I pass the data in a way that will update the Details when I click in an image without starting a new activity? Thanks.

The [communicating with other fragments](http://developer.android.com/training/basics/fragments/communicating.html) documentation is the simplest example of master-detail fragments I've found. — OneCricketeer, Dec 14 '15 at 21:33

score 1 · Accepted Answer · answered Mar 09 '16 at 00:07

1

Simple.

DetailActivityFragment fragment= (DetailActivityFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
    if (fragment != null) {
        fragment.updateImage(url);
    }

answered Mar 09 '16 at 00:07

CasMindspark

38
4

score 0 · Answer 2 · answered Dec 14 '15 at 21:49

Since you have a static fragment in your layout which I assume you will not remove, I would say use a simple logic like this:

In your activity, create a method which will update your static fragment like:

public void updateImage(String imageUrl) {
    DetailActivityFragment fragment= (DetailActivityFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
    if (fragment != null) {
        fragment.updateImage(imageUrl);
    }
}

Whenever you click an image, you call this method.

And inside your fragment load your image in your ImageView(you should have one).

score 0 · Answer 3 · answered Dec 15 '15 at 04:53

Use EventBus by square.

Create a Bus Object and register it in Activity

Bus bus = new Bus();
bus.register(this);

Create a public method in Activity with argument as your Model.

@Subscribe 
public void getDataFromGrid(MainGridItem item) {
    // TODO: React to the event somehow!
}

At GridView onItemClick post the item -

bus.post(mainGridItems.get(position));

score 0 · Answer 4 · edited Dec 15 '15 at 23:53

0

You can find the fragment using

Fragment fragment = getFragmentManager().findFragmentById(R.id.fragmentLoadingSpace)
if(fragment instanceof  Fragment1){
    ((Fragment1) fragment).updateSelectedObjec(Objects object);
}

edited Dec 15 '15 at 23:53

Mike

4,550
4
33
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answered Dec 15 '15 at 10:58

anoopg87

82
6

score -1 · Answer 5 · edited May 23 '17 at 12:13

-1

I posted a full answer on another SO link @ Passing data between fragments contained in an activity. Simply find my user name and it is the only answer for that post. Let us know of your progress.

edited May 23 '17 at 12:13

Community

1
1

answered Dec 14 '15 at 21:46

The Original Android

6,147
3
26
31

1

If this is a duplicate, you should've voted it as such, rather than posting a link-only answer that just points to another post. – Mike M. Dec 14 '15 at 23:40
@MikeM. I'll think about it next time. I am reluctant to vote any post as duplicate, and then it might be closed, as voted by others. I remember one time I actually disagreed with that on another post by someone else. – The Original Android Dec 15 '15 at 01:02

How to pass data between 2 fragments displaying on the screen?

5 Answers5