How to call fragment's method from activity Android?

Question

I have this kind of structure

MainPage Activity1 has view pager holding 3 fragments
I am using tabapdater
The first of the fragments have method to move to another Activity2

I want to fire some method in the first fragment when button is clicked in Activity2

Can i do that? can you guys give me any example code for it??

Thanks guys

You want to change the first fragment from the second activity...am I right? — Mohammad Zarei, Oct 16 '16 at 09:17
I just want to pass some object from the second activity to the first fragment — Kisung Tae, Oct 16 '16 at 09:22
I have a solution,but first let me know if you mean FragmentPagerAdapter instead of tabadapter? — David Heisnam, Oct 16 '16 at 09:27
I have TabAdapter class. It extends FragmentPagerAdapter. and I am using it to create the fragment — Kisung Tae, Oct 16 '16 at 09:32
You should use @DavidH in comments, otherwise other users won't get notified. You can check this answer http://stackoverflow.com/a/2141166/2036537 for passing objects between Activities. Anyway, I think that your Activity2 could be replaced with a fragment instead, but idk how exactly your app works. — David Heisnam, Oct 16 '16 at 09:39
Might be useful. http://stackoverflow.com/questions/24777985/how-to-implement-onfragmentinteractionlistener — OneCricketeer, Oct 16 '16 at 09:41

score 0 · Answer 1 · answered Oct 16 '16 at 09:31

There are some solutions. The first one I think is startActivityForResult. If you start your second activity by calling startActivityForResult instead of startActivity you can expect the result in first activity by overriding the onActivityResult method and then change the first fragment content from there.

Another good and easy solution is using Buses like EventBus and otto. They are well documented.

T.S · Answer 2 · 2016-10-16T11:07:04.823

0

In your Fragment class:

public void foo(Object objectToPassFromActivity) {
    // do what you want
}

In Your activity:

ExampleFragment fragment = (ExampleFragment) getFragmentManager().findFragmentByTag(getFragmentTag(R.id.yourViewPagerId, fragmentPosition);
fragment.foo(objectToPassFromActivity)

Add method:

private String getFragmentTag(int viewPagerId, int fragmentPosition) {
    return "android:switcher:" + viewPagerId + ":" + fragmentPosition;
}

You can see the link that i added in comments to get more details.

edited Oct 16 '16 at 11:07

answered Oct 16 '16 at 09:52

T.S

911
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should put fragment id in the xml file? – Kisung Tae Oct 16 '16 at 10:13
should i put fragment Id in the xml file? – Kisung Tae Oct 16 '16 at 10:16
cause i am creating the fragment in TabAdapter – Kisung Tae Oct 16 '16 at 10:28
http://stackoverflow.com/questions/14035090/how-to-get-existing-fragments-when-using-fragmentpageradapter, use findFragmentByTag instead of findFragmentById. – T.S Oct 16 '16 at 10:49

How to call fragment's method from activity Android?

2 Answers2