How to change the view of a viewpager fragment from its parent activity

Question

In this image I have a list.

What I want is to change the view of this Fragment to the image given below.

On the header, I want to add a search button. By clicking on the button the second image layout will appear and and by clicking the button again, it will fire a web service that returns with the response.

can you please elaborate the question ? what functionality you want ? — Vinodh, Dec 06 '16 at 09:38
here is best example http://simpledeveloper.com/how-to-communicate-between-fragments-and-activities/ — Rajesh, Dec 06 '16 at 09:44

score 0 · Answer 1 · answered Dec 06 '16 at 09:55

First of all add the search button.Initialize it in your main activity.In your project I suggest you to do with a single onclicklistner and a longclicklistner.For double tap you have to initialize a gesture. I can provide you a code for any approaches but I strongly suggest you go with the first one.Reply mi accordingly I will provide you a code.

score 0 · Answer 2 · edited May 23 '17 at 12:24

I think that what you are actually asking is "How to get a reference of the ViewPager's Fragment and do something with that". If this is the case, you can have a look here, you see, its a very common and not that easy problem. One way to solve ot correctly (providing that you are already using a FragmentStateAdapter) is doing something like the following:

In your activity:

  private CustomFragment mHomeFragment;
  private CustomFragment mOfferFragment;
  private CustomFragment mFavoriteFragment;
  private CustomFragment mInfoFragment;

and then, in your adapter

 @Override
    public Fragment getItem(int position) {
        return CustomFragment.newInstance(position, null);

    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {

        Fragment createdFragment = (Fragment) super.instantiateItem(container, position);
        // save the appropriate reference depending on position
        switch (position) {
            case 0:
                mHomeFragment = (CustomFragment) createdFragment;
                break;
            case 1:
                mOfferFragment = (CustomFragment) createdFragment;
                break;
            case 2:
                mFavoriteFragment = (CustomFragment) createdFragment;
                break;
            case 3:
                mInfoFragment = (CustomFragment) createdFragment;
                break;
        }
        return createdFragment;
    }

Doing that, it will allow you to do:

mViewPager.setCurrentItem(1);
mOfferFragment.doSomething();

in your parrent Activity

How to change the view of a viewpager fragment from its parent activity

2 Answers2