FragmentManager from Context

Question

I created a new View class. Within that class I need to get access to the FragmentManager, but I cannot figure out how.

Can I access the

Answer 1

This is what worked for me:

Context mContext;
...


//Get FragmentManager
FragmentManager fragmentManager = ((Activity) mContext).getFragmentManager();

(Of course you have to first of all initialize mContext)

Answer 2

if you are using support fragments, you probably actually want:

try {
  FragmentManager fragmentManager = ((FragmentActivity) context).getSupportFragmentManager();
} catch (ClassCastException e) {
  Log.e(TAG, "Can't get fragment manager");
}

Answer 3

Since your context object can't always be directly casted to Activity, this is a more reliable way to do this:

@Nullable
public static Activity getActivityFromContext(@NonNull Context context){
    while (context instanceof ContextWrapper) {
        if (context instanceof Activity) return (Activity) context;
        context = ((ContextWrapper)context).getBaseContext();
    }
    return null; //we failed miserably 
}

Answer 4

You can get access to a FragmentManager (or SupportFragmentManager) in an Application - but as other answers suggests, you can only do this via an Activity instance.

However, you can gain access to a FragmentManager via an Activity without needing to directly call any Activities using the ActivityLifecycleCallbacks interface:

registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks {

    @Override
    public void onActivityCreated(Activity activity, Bundle bundle) {
        activity.getFragmentManager()
        if(activity instanceof FragmentActivity) {
            ((FragmentActivity)activity).getSupportFragmentManager();
        }
        unregisterActivityLifecycleCallbacks(this);
    }

    ...

Answer 5

Only if the given Context extends Activity (Post-Honeycomb) or FragmentActivity (pre-honeycomb).

In which case you'd have to make 100% sure it's an activity using reflection or try-catch.

try{
  final Activity activity = (Activity) context;

  // Return the fragment manager
  return activity.getFragmentManager();

  // If using the Support lib.
  // return activity.getSupportFragmentManager(); 

} catch (ClassCastException e) {
  Log.d(TAG, "Can't get the fragment manager with this");
}

Thought I recommend refactoring so a View is really just meant for showing stuff and shouldn't actually modify the state of your app, but that's my opinion.