Question

So I am working on a project I want to run on legacy Android devices so I am using the compatibility library. I am using an interface similar to NewsReader, only instead of the two fragments being in the Activity, they are embedded in another Fragment, which is embedded in a ViewPagger.

For simplicity we will use these terms…

Activity -> ViewPager -> ContainerFragment->Fragment1
                                          ->Fragment2

In ContainerFragment I am trying to replace out fragment 1 with fragment 2 if it is a phone so I tried the following code in ContainerFragment…

import android.support.v4.app.FragmentTransaction;    
...
public void onBarSelected(Integer index) {
    selectedBarIndex = index;
    if (isDualPane) {
        // display it on the article fragment
        mBarEditFragment.displayBar(index);
    }
    else {
        // use separate activity
        FragmentActivity activity = (FragmentActivity)getActivity();
        FragmentTransaction ft = activity.getFragmentManager().beginTransaction();
        ft.replace(R.id.bar_container, new BarEditFragment(),R.id.bar_edit);
    }

}

But I get the following compile error

Type mismatch: cannot convert from android.app.FragmentTransaction 
 to android.support.v4.app.FragmentTransaction

I double checked and the activity does extend the compatibility FragmentActivity.

UPDATE

Tried to change to…

and got….

MainActivity activity = (MainActivity)getActivity();
Object test = activity.getFragmentManager().beginTransaction();
FragmentTransaction ft = (FragmentTransaction)test;
ft.replace(R.id.bar_container, new BarEditFragment());

And I got…

java.lang.ClassCastException: android.app.BackStackRecord cannot be cast to android.support.v4.app.FragmentTransaction

Any ideas?

ANSWER:

I figured out my problem The issue is you shouldn’t get the Fragment manager from the Activity and should get it from the fragment instead.

This works….

public void onBarSelected(Integer index) {
    selectedBarIndex = index;
    if (isDualPane) {
        // display it on the article fragment
        //mBarEditFragment.displayBar(index);
    }
    else {
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.bar_container, new BarEditFragment());
        ft.commit();
    }

}

Answer 1

Facing same problem solved using

getSupportFragmentManager()

Thanks