How to return "result" from one class to a defined class?

Question

I am working with ViewPager i.e on top of the MainActivity class and the Viewpager class extends fragment.

The problem is that, normally when we need a class to return some result then while passing the intent we use startActivityforresult(intent,int) hence it passes the result captured in the secondactivity the class from where it's been called.

But as i am working with viewpager on top of the mainactivity and i am using floating action button, when i click the button to open the second activity it returns the result to the mainactivity but not the viewpager class.

So my question is how can i pass the result taken from the secondactivity to my desired class?

Update:: MainActivity.java this is my main class which is using the intent as well as receiving the result from the second activity class ActivityTwo

What i have done here is

startActivityForResult(intent,1);
public void onActivityresult(i,j,intent){MyFragment fragment;
fragment.onActivityReusult(i,j,intent);//Here i have passes the values      
received by this class to the fragment class where i need the values but it's not working
}

can you call the viewpage adapter from your main activity which will call the fragment to pass the data down — Tomer Shemesh, Apr 22 '15 at 17:22
yes as i am creating and calling the pager class within my mainactivity — silverFoxA, Apr 22 '15 at 17:23
so in onActivityResult result can you call viewPageAdapter.passData(my data) and have that pas it to the fragment. and just create pass data in your adapter — Tomer Shemesh, Apr 22 '15 at 17:24
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/75956/discussion-between-virus-and-tomer-shemesh). — silverFoxA, Apr 22 '15 at 17:33
The error in this case happens because the `fragment` is null, isn't it? You called `onActivityReusult` after you've just instantiated your `MyFragment`. Take a look my example again and see I got the `_fragment` from a list which I've already instantiated before in `onCreate`. — Lennon Spirlandelli, Apr 23 '15 at 12:17
i am getting this error `Failure delivering result ResultInfo` and sir the fragment is not null — silverFoxA, Apr 23 '15 at 13:28

score 0 · Answer 1 · edited May 23 '17 at 12:28

0

You can use a Bundle. Take a look at this topic : Bundle

bookDescFragment = new BookDescFragment();
Bundle args = new Bundle();
args.putInt(BookDescFragment.MyVariabl, VariableValue);
myFragment.setArguments(args);

edited May 23 '17 at 12:28

Community

1
1

answered Apr 22 '15 at 17:38

ZAIRI Oussama

745
9
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Lennon Spirlandelli · Answer 2 · 2015-04-22T19:57:01.297

The best way to do that is to create an Interface with one method. Then the fragment implements this Interface. After that, you might call this method in the onActivityResult. You just get the desired fragment in the onActivityResult and call the method from its Interface

EDIT:

Interface example:

public interface Interface_example {

    public void onActivityResult();

}

Fragment example:

public class Fragment_example extends Fragment implements Interface_example {

    @Override
    public void onActivityResult() {

        //Here you can do whatever you want

    }

}

Activity example:

public class Activity_example extends FragmentActivity {

    private ArrayList<Fragment> mFragmentList;
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_example);

        mFragmentList = new ArrayList<Fragment>();
        mFragmentList.add(new Fragment_example());

        mViewPager.setAdapter(new SimpleTabPagerAdapter(
                getSupportFragmentManager(), mFragmentList));

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        Fragment _fragment = mFragmentList.get(mViewPager.getCurrentItem());

        if(_fragment instanceof Fragment_example){

            // This line will call that method previously created
            ((Fragment_example) _fragment).onActivityResult();

        }

    }

}

Sir can you please describe it with a tutorial link or an example code or something — silverFoxA, Apr 22 '15 at 19:08

How to return "result" from one class to a defined class?

2 Answers2