Develop Reference

Add transaction transition for fragments

When I navigate to an activity using ShowViewModel, it is nicely animated. But when the target is a Fragment it won't. Is there a way to add this as well?
I saw that in native android you would add it to the FragmentTransaction, but since MvvmCross Handles that for us, I assume there is another place to handle that.

The code that handles the fragment transaction is the Show method from the activity implementing IMvxFragmentHost that's responsible for handling the specific Fragment being show. In order to change the animation, you need to use the SetCustomAnimations method when displaying the fragment.
What I usually do is creating a BaseFragmentView class that has enter and leave animations exposed as properties. When displaying the fragments, I can simply use those properties like this:
var transaction = SupportFragmentManager
.BeginTransaction()
.SetCustomAnimations(fragmentView.EnterAnimation, fragmentView.ExitAnimation)
.Replace(targetId, fragmentView)
.Commit();
When using the MvxChachingFragmentView, you can simply override the OnBeforeFragmentChanging method and use the second parameter to add the custom animations you want.
You can see how to implement the IMvxFragmentHost interface by checking the MvxCachingFragmentView class and, if you don't know how to use the new Fragments from MvvmCross 4, refer to this answer

Android viewpager in fragment

Dear ladies and gents,
First of all, please do not mark my question down. If you think that my question is too stupid please let me know and i will edit it or remove.
So my actual question is that I have an activity (extends Activity). In that activity's layout I created FrameLayout where I then attach different four fragments(so each of them extends Fragment. So in one of that fragments I would like to implements swipeable tabs(see screenshot).
I know that it is usually done by implementing viewPager and FragmentPagerAdapter, but I can not do this as if I'm calling getSupportFragmentManager in my fragment it gives my an error. If i am using getActivity().getFragmentManager() it gives me error that android.support.v4.app.fragmentmanager cannot be applied to android.app.fragmentmanager. I have to use android.support.v4.app.fragment in my fragment, because otherwise I will not be able to implement my activity's view(described at the beggining).
Any ideas or suggestions would be very appreciated.screenshot

Make sure you are using Fragment class that you extends your fragments comes from support library. You also need to use FragmentActivity to call method getSupportFragmentManager();
On the other hand, viewpager which is in your fragment need to implemented as usual that you can find on internet except getChildSupportFragmentManager();
This one called "nested fragments".
PS: I am not sure but you can also use AppCompatActivity instead of FragmentActivity. FragmentActivity and ActionBarActivity must be deprecated.
Good luck

You can use getChildFragmentManager() when using Fragments inside other Fragments.

New version of Support Library v4 (Android 4.2) resolve this problem. For do this, simply do constructor of your custom FragmentPagerAdapter like this:
public CustomFragmentPagerAdapter(android.support.v4.app.Fragment fragment)
{
super(fragment.getChildFragmentManager());
// write your code here
}
This work because new Android version approve using nested Fragments

Android how to send data to a running fragment

is there a way to send some data from an activity to a running fragment?
In my app I'm adding a second fragment over another fragment. I intentionally use the add method instead of the replace method. So now I want to hide my second fragment with
fragmentManager.popBackStack();
and my first fragment reappears. After hiding the second fragment I want to send some data from my activity to the still running frist fragment.
Any idea how to do this? It doesn't work with bundles (put extra), because I don't rebuild the fragment, I just hide the second one!

one simple solution is:
MyFragment oldFragment = (MyFragment) fragmentManager.findFragmentById(R.id.fragment_place);
fragmentManager.popBackStackImmediate();
MyFragment newFragment = (MyFragment)fragmentManager.findFragmentById(R.id.fragment_place);
newFragment.postData(...);

You can use an EventBus library like this one, it's easy to use and very convenient.

You can use tags on the Fragments when you create them to call them when needed.
getFragmentManager().beginTransaction()
.add(R.id.content, new SomeFragment(), SomeFragment.class.getSimpleName())
.commit();
So above I use the simple name of the class to tag the fragment when I create and add it to the activity.
SomeFragment fragment = (SomeFragment) getFragmentManager().findFragmentByTag(SomeFragment.class.getSimpleName());
And I can call it back when I need it and know it is being displayed like above, now I can call send it data like normal by calling a public method in the custom fragment and passing it the data as a param.

CalendarDatePickerDialog on Activity without support package

I'm using CalendarDatePickerDialog from BetterPickers in my project,
if i use a FragmentActivity, then i can use the getSupportFragmentManager().
The problem is that i'm trying to add CWAC-Camera as well,
but for that i need to use
getFragmentManager() in a regular Activity which breaks the BettePickers.
any ideas?

Try to extends FragmentActivity and implements CalendarDatePickerDialog.OnDateSetListener
Change your Activity to FragmentActivity.
Use the newInstance(YouActivity.this)
Enjoy!

How can I display a Dialog from a PreferenceFragment?

I'm trying to bring up a DialogFragment when I tap a Preference in a PreferenceFragment. Unfortunately, when I call getFragmentManager() in DialogFragment.show() I receive the following error:
Cannot resolve method 'show(android.app.FragmentManager, java.lang.String)'
The problem is that I can't seem to refernece android.support.v4.app.FragmentManager from this fragment. The activity in charge of this fragment extends from FragmentActivity, but obviously that's not enough. I tried calling getSupportFragmentManager() as well, but that gave me this error:
Cannot resolve method 'getSupportFragmentManager()'
How can I make this work?
Here's some code:
gPrefAcknowledgements.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener()
{
#Override
public boolean onPreferenceClick(Preference preference)
{
DialogAcknowledgements dialogAck = new DialogAcknowledgements();
dialogAck.show(getFragmentManager(), "acknowledgements");
return true;
}
});

Building on Steve's answer, I also need to set up the DialogFragment to import from android.app.DialogFragment (instead of android.support.v4.app.DialogFragment). The show() function in that library asks for an android.app.FragmentManager, which I can provide via a call to getFragmentManager() as I did within the code I posted in the question.

Try this:
dialogAck.show(getActivity().getFragmentManager(), "acknowledgements");
You can always call the Activity which holds the Fragment equal of which type it is.
EDIT:
I was wrong, the PreferenceFragment isn't included in the Support Library and is only available in Android 3.0 and higher. This post could help to deal with this scenario.