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How do I get the currently displayed fragment?

Asked 2012-02-15T13:49:02.730
544

I am playing with fragments in Android.

I know I can change a fragment by using the following code:

FragmentManager fragMgr = getSupportFragmentManager();
FragmentTransaction fragTrans = fragMgr.beginTransaction();

MyFragment myFragment = new MyFragment(); //my custom fragment

fragTrans.replace(android.R.id.content, myFragment);
fragTrans.addToBackStack(null);
fragTrans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
fragTrans.commit();

My question is, in a Java file, how can I get the currently displayed Fragment instance?

android android-layout android-intent android-fragments
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2 Answers

83

Every time when you show fragment you must put it tag into backstack:

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.setTransition(FragmentTransaction.TRANSIT_ENTER_MASK);       
ft.add(R.id.primaryLayout, fragment, tag);
ft.addToBackStack(tag);
ft.commit();

And then when you need to get current fragment you may use this method:

public BaseFragment getActiveFragment() {
    if (getSupportFragmentManager().getBackStackEntryCount() == 0) {
        return null;
    }
    String tag = getSupportFragmentManager().getBackStackEntryAt(getSupportFragmentManager().getBackStackEntryCount() - 1).getName();
    return (BaseFragment) getSupportFragmentManager().findFragmentByTag(tag);
}
answered 2013-03-21T09:24:49.883
13

My method is based on try / catch like this :

MyFragment viewer = null;
    if(getFragmentManager().findFragmentByTag(MY_TAG_FRAGMENT) instanceOf MyFragment){
    viewer = (MyFragment) getFragmentManager().findFragmentByTag(MY_TAG_FRAGMENT);
}

But there may be a better way ...

answered 2012-02-15T13:54:44.913

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