I want to swipe the fragments left and right which is added inside a viewpager .But i am not able to get a method in robolectric .Is there any way to achieve this in robolectric
You could do it like this..
// ... initialise your activity using Robolectric.buildActivity().create().start().visible() etc.
ViewPager viewPager = (ViewPager) myActivity.getWindow().findViewById(R.id.view_pager_tabs);
viewPager.setCurrentItem(idOfFragmentInterestedIn); // or use getCurrentItem()+1 to go right
When I tried this, I had some problems with the Fragments not getting loaded in the ViewPager when testing, but while it definitely occurred only with Robolectric, it may have had more to do with our own implementation rather than the framework, so I can't make any good suggestions out of that.
The first thing you need to do is to find a reference to your viewPager and set the page (Fragment) you want to display (As Alex Florescu said before):
ViewPager viewPager = (ViewPager) activity.getWindow().findViewById(R.id.viewPager);
viewPager.setCurrentItem(desired_tab_position);
Then you need to make sure the fragment is added to the fragment manager by doing it manually:
Fragment desiredFragment =
activity.getSupportFragmentManager().findFragmentById( R.id.fragmentId );
FragmentManager fragmentManager = activity.getSupportFragmentManager();
fragmentManager.beginTransaction().add( desiredFragment, null ).commit();
activity.getSupportFragmentManager().executePendingTransactions();
This will ensure that your fragment is actually created and you can access any view that belongs to your fragment.
Related
I want to show a few tabs sharing the same viewmodel with viewpager in an activity. I am using MvvmCross 5.6.2.
When I do that in a fragment, the viewpager is shown properly. Using the same method, I add tab fragments to the viewpager in an activity with code like this:
var viewPagerFragmentList = new List<MvxViewPagerFragmentInfo>
{
new MvxViewPagerFragmentInfo("Personal", typeof (SettingPersonalFragment), ViewModel),
new MvxViewPagerFragmentInfo("Preference", typeof (SettingPreferenceFragment), ViewModel)
};
viewPager.Adapter = new MvxCachingFragmentStatePagerAdapter(this, SupportFragmentManager, viewPagerFragmentList);
var tabLayout = FindViewById<TabLayout>(Resource.Id.tabs_fragment_setting_viewpager);
tabLayout.SetupWithViewPager(viewPager);
The tab fragments are not shown on screen, though the tab fragment's OnCreate and OnCreateView are executed.
I found the latest sample Playground is showing tabs in activity too. Following the sample, I register the fragment:
[MvxTabLayoutPresentation(TabLayoutResourceId = Resource.Id.tabs_fragment_setting_viewpager, ViewPagerResourceId = Resource.Id.viewpager_fragment_setting_viewpager, Title = "Personal", ActivityHostViewModelType = typeof(SettingViewModel))]
No luck with that. The last thing I found in Playground to show a tab is to navigate to the fragment viewmodel:
_navigationService.Navigate<Tab2ViewModel>();
_navigationService.Navigate<Tab3ViewModel>();
However, in my case, I do not have a viewmodel for each fragment. The workaround on my hand is to move the viewpager to a fragment in the activity.
How could I show the viewpager fragments without their own viewmodels in an activity?
Thanks,
Nick
The above code that works in fragment also work in activity. There is an issue in the xml causing the viewpager not showing. Sorry.
Thanks everyone who helped.
EDIT: I want to solve problem of duplicating fragment in view Pager, removing them isn't the best solution.
I have a problem with FragmentManager in my app. Every time when I click "Wykłady teoretyczne" or "Wykłady popularnonaukowe" on Navigation Drawer my app is creating new fragment ScheduleFragment() which contains ViewPager and in SchedulePagerAdapter app is creating new 3 fragments (ScheduleEventFragment()) to swipe them in ScheduleFragment. My problem is that FragmentManager doesn't remove old ScheduleEventFragments, for all the time it keeps them in memory. How can I fix this problem?
I have my project on GitHub, please check it.
There you have screen from debuging
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.remove(R.id.container,fragment,optionalTag);
fragmentTransaction.commit();You can also detach or replace
Always check if fragmemt.isAdded() and then only add the fragment if not.
I have an Activity called Mytaskonclick extends Activity and a Fragment called SentTaskFragment extends Fragment. I want to go from Mytaskonclick to SentTaskFragment on click of a button. I tried using the code
Intent ii=new Intent(Mytaskonclick.this,SentTaskFragment.class);
startActivity(ii);
But this code doesn't work. Can anyone suggest me how to do it?
Fragments does not work like this.You need to put a place holder in your activity, say FrameLayout for example and, inside on click, you get the fragment and attach it inside this placeholder. I suggest you read the Fragment Tutorial Here. It contains all what you need to know and extremely useful for you.
When you want to switch to a Fragment them you have to do that through FragmentManager. Pass that thae Fragment object into beginTransaction() method of FragmentManager along with the container layout which will hold the Fragment as below...
SentTaskFragment fragment = new SentTaskFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().add(R.id.frame_container, fragment).commit();
You can see some tutorial from below link...
Android Developer-Fragment
Multi-pane development in Android with Fragments - Tutorial
Android Fragments
Android Fragments Example
I'm working with fragments with ViewPager concept. I'm creating a diary app in which I'm using only one fragment which gets all updates from database and show in it. Until this everything is fine...According to my requirement when i click on a button in fragment i need to show another fragment which allows the user to store the images.
My problem is.....
--If i use replace method in fragments it was not replacing properly in the sense if A is fragment which consists of viewpager and B is a fragment i want to replace.
--Then if i use replace B is visible but A also appears under the fragment B
FragmentManager m=getActivity().getSupportFragmentManager();
FragmentTransaction ft = getActivity().getSupportFragmentManager()
.beginTransaction();
Demobutton demobutton = new Demobutton();
ft.replace(R.id.lay, demobutton);
ft.commit();
Hope you guys understand my problem. If you feel my question is incomplete please let me know that.
I have two suggestions depending on how you use the DemoButton Fragment:
1) Maybe your issue is with nested fragments. You get the FragmentManager from the activity but if the Demobutton is already part of an fragment use getChildFragmentManager() of the outer fragment instead.
2) From my experience when using a ViewPager with Fragments the PagerAdapter of the ViewPager should do all the fragment transactions. You could extend and overwrite the class FragmentPagerAdapter from the support library in order to get the correct fragment in your ViewPager when you need it.
I've developed a small example app that achieves this without overwriting native classes.
The point is to use a fragment as a container.
In your ViewPagerAdapter:
#Override
public Fragment getItem(int position) {
/*
* IMPORTANT: This is the point. We create a RootFragment acting as
* a container for other fragments
*/
if (position == 0)
return new RootFragment();
else
return new StaticFragment();
}
RootFragment layout should look like:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/root_frame" >
</FrameLayout>
You could review my complete explanation here: https://stackoverflow.com/a/21453571/1631136
I'm having problem with view pager which is inside of some fragment. To work with view pager I'm using FragmentPagerAdapter. And sure I'm getting java.lang.IllegalStateException: Recursive entry to executePendingTransactions exception when trying to run my app.
Most people say it's impossible to have FragmentPagerAdapter inside other fragment, so I'm sorry if this question is invalid. I was just hoping that maybe someone has some fresh ideas about this problem and its possible solution.
P.S. I've got an advice to set adapter inside of AsyncTask (I can clarify this case if someone needs it), but this solution has some bugs related with restoring such fragment state, so it's working for me.
Starting with Android 4.2, you can use nested fragments. The Android support library now also includes support for this, so you can use it with older Android versions.
The basic pattern looks like this:
Fragment videoFragment = new VideoPlayerFragment();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.video_fragment, videoFragment).commit();