Call an activity method from a fragment

Question

Trying to call a method in my activity from a fragment. I want the fragment to give the method data and to get the data when the method return. I want to achieve similar to

Answer 1

From fragment to activty:

((YourActivityClassName)getActivity()).yourPublicMethod();

From activity to fragment:

FragmentManager fm = getSupportFragmentManager();

//if you added fragment via layout xml
YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentById(R.id.your_fragment_id);
fragment.yourPublicMethod();

If you added fragment via code and used a tag string when you added your fragment, use findFragmentByTag instead:

YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentByTag("yourTag");

Answer 2

((YourActivityName)getActivity()).functionName();

Example : ((SessionActivity)getActivity()).changeFragment();

Note : class name should be in public

Answer 3

In kotlin you can call activity method from fragment like below:

var mainActivity: MainActivity = activity as MainActivity
        mainActivity.showToast() //Calling show toast method of activity

Answer 4

Update after I understand more how fragments work. Each fragment belongs to a parent activity. So just use:

getActivity().whatever

From within the fragment. It is a better answer because you avoid superflous casts. If you cannot avoid the casts with this solution use the one below.

============

what you have to do is to cast to the outer activity

((MainActivity) getActivity()).Method();

creating a new instance will be confusing the android frame and it will not be able to recognize it. see also :

https://stackoverflow.com/a/12014834/1984636

https://stackoverflow.com/a/2042829/1984636

Answer 5

For Kotlin developers

(activity as YourActivityClassName).methodName()

For Java developers

((YourActivityClassName) getActivity()).methodName();

Answer 6

I have tried with all the methods shown in this thread and none worked for me, try this one. It worked for me.

((MainActivity) getContext().getApplicationContext()).Method();