Call Fragment B From Fragment A Using Viewpager Tabs

I have done many programs, where I have implemented multiple Fragments inside a Single Activity, but not when using Single Activity to host multiple Fragments as Tabs and then on T

Solution 1:

you can have a callback interface that is implemented by the activity which hosts these two fragments. Fragment A will use the call back to notify the activity to replace A with fragment B. Depending on your need, you can pass parameters across through the callback method itself.

Your callback interface:

publicinterfaceYourCallback {
    publicvoidmethodWhichReplacesFragmentAwithB(params...);
}

Your Activity hosting fragments:

publicclassYourActivityextends ... implementsYourCallback {
  ..
  ..
  @OverridepublicvoidmethodWhichReplacesFragmentAwithB(params...) {
    //insert replace fragment code here
  }
}  

Your fragment will have a callback object, YourCallback callbackObj;. This callback object can be initialised using the activity (pass as this from activity) itself since the activity has the implementation of the interface. Now, you can use

callbackObj.methodWhichReplacesFragmentAwithB(actual_params...);

to replace the fragment. This callback interface can be exploited for other communications to parent Activity as well as other fragment hosted in that activity.

Solution 2:

To replace fragment,

FragmentTransactiontransaction= getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_container, someFragment).addToBackStack("null").commit();

Solution 3:

You can try this:

YourFragmentfragment=newYourFragment();
FragmentTransactiontransaction= ((AppCompatActivity) mContext).getSupportFragmentManager()
                            .beginTransaction();
transaction.replace(R.id.frame, fragment);
transaction.addToBackStack(null);
transaction.commit();

Solution 4:

There is One option which i have been using from long time before. I will added the solution with clear example.

So you want to pass the value from fragment A to fragment B

So, here what you want to do is, you have pass the value through the activity.

1) you pass the value from fragment A to activity

2) then activity to fragment B

Step 1: first create an Interface Like below in fragment A

publicinterfaceHomePage {
      voidonHomeButtonsClicked(String clickedButton);
   }

   publicvoidsetOnHomeButtonClicked(HomePage homePage) {
     this.homePage = homePage;
   }

Step 2: then create the instance like below in Activity. where fragment created in PagerAdapter

 ((FragmentA) fragment).setOnHomeButtonClicked(newFragmentA.HomePage() {
                    @OverridepublicvoidonHomeButtonsClicked(String buttonClicked) {                         
                            pageSelected.onHomeButtonsClicked(selectedPage);                          
                        }
                    }
                });

Step 3: then create the interface in Activity like below.

publicinterfacePageSelected {
    voidonHomeButtonsClicked(String clickedButton);
}

publicvoidsetOnHomeButtonClicked(PageSelected pageSelected) {
    this.pageSelected = pageSelected;
}

step 3: then add the following method in fragment B in onCreateView or onResume()

  ((MainActivity) getActivity()).setOnHomeButtonClicked(newMainActivity.PageSelected() {
        @OverridepublicvoidonHomeButtonsClicked(String clickedButton) {
            //fragment B received the value here 
        }
    });

Step 5: finally add the line in fragment A in button click or where you want to pass the value.

 homePage.onHomeButtonsClicked("Some String , by this code it is in String. you can change in your own data type");

You can rise your question if you face any difficulties.