I want to build a ViewPager with 2 Pages. On the first page you can choose a category. When a List item is selected the screen swipes to the second page and you can choose some subcategories.
I implemented the clicklistener and so on. But I have no idea how to set the current page from within a fragment. Is it even possible? Or do you have another solution for me? Hope you understand what I want to achieve.
Ok, found a solution for my own. Thanks to Sayem for the hint.
I passed the ID of the ViewPager via bundle to my first fragment. in my fragment i could use then this simple code:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
viewPagerId = getArguments().getInt("viewPagerId");
View rootView = (View) inflater.inflate(R.layout.fragment_cat, container, false);
populateListView(rootView);
viewPager = (ViewPager) getActivity().findViewById(viewPagerId);
return rootView;
}
and to switch pages then simply this:
viewPager.setCurrentItem(position);
Thanks for the help
use ((ActivityName)getActivity()).getViewPager().setCurrentItem(position);
note: getViewPager() should return the viewpager instance
try:
mPager.setCurrentItem(position);
Related
In need of a good Ui design for my app with tab layout, i searched in google and i found one UI which is using View Pager and Action bar Tabs.
Link is:
http://www.androidhive.info/2013/10/android-tab-layout-with-swipeable-views-1/
i downloaded the template & imported to eclipse.i to tried use that template, don't know where to add my activity coding.
i uploaded one of the fragment below, and i tried to get action of a button. but "it shows create a method finViewById".
public class MoviesFragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_movies, container, false);
Button bu=(Button) findViewById(R.id.button1);
return rootView;
}
i don't know much about fragment. I searched in google but i am not able get solution related to this. anyone pls can help me how and where to add my activity coding using above UI Template. Thanks in advance.
try this,
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_movies, container, false);
Button bu=(Button) rootView.findViewById(R.id.button1);
return rootView;
}
use this
Button bu=(Button)rootView.findViewById(R.id.button1);
I am looking for a hint/way how to achieve such a "layout" in android. What I have so far is layout of mainActivity, on which is embedded fragment A. What I wanna do, is place above fragment A next one (Fragment B). For better illustration image is included.
How should I implement such a composition ? Also, after click on "Save" it should process inserted information a fragment should be hidden/removed.
Thanks in advance
You can use DialogFragment. You may refer to this or this tutorial
Create layout (your editview and button), e.g. fragment_register_account.xml
Inflate the layout in a class e.g. RegisterAccountDialog that extend DialogFragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_register_account, container);
mEditText = (EditText) view.findViewById(R.id.txt_your_name);
getDialog().setTitle("Hello");
return view;
}
3.Register onClick to your 'Create new Account' button and show the DialogFragment.
FragmentManager fm = getSupportFragmentManager();
RegisterAccountDialog dialog = new RegisterAccountDialog();
dialog.show(fm, "fragment_edit_name");
A good tutorial here
I'm creating an application with a CustomPagerAdapter that can be controlled by ActionBar tabs or horizontal swipe. When you select a tab, a fragment corresponding to that tab is displayed on the screen. When the app is created and when any tab is selected, the adjacent tabs, fragments are loaded into memory. I do not want this to happen. I would like it so that when a tab is selected only that selected tab's fragment is loaded into memory. Is there a way to do this?
Edit: The code I'm currently having trouble with is as follows:
public class fragA extende Fragment
{
private VideoView videoViewA;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.fragment_A, container, false);
videoViewA = (VideoView) rootView.findViewById(R.id.videoViewA);
return rootView;
}
#Override
public void setUserVisibleHint(final boolean isVisibleToUser)
{
super.setUserVisibleHint(isVisibleToUser)
if (isVisibleToUser)
{
videoViewA.setVideoURI(LINK);
videoViewA.start();
}
else
{
videoViewA.stopPlayback();
}
}
}
The error I'm receiving is at the videoViewA.setVideoURI(LINK); line. Mind you, the link is actually there, but for privacy reasons I cannot post it.
Edit 2: It's ajava.lang.NullPointerException.
Edit 3: Sorry, but I'm doing this all the hard way. The code now reflects what I have actually written.
Try loading your videos within setUserVisbleHint(), which gets fired by the FragmentPageAdapter upon showing the fragment.
http://developer.android.com/reference/android/support/v4/app/Fragment.html#setUserVisibleHint(boolean)
If that doesn't work for you, you can also try to do check onHiddenChanged(boolean hidden).
http://developer.android.com/reference/android/app/Fragment.html#onHiddenChanged(boolean)
Once again, I am so annoyed by the AndroidSDK . Why does this have to be so complicated?
I have a ViewPager that I want to populate with my Fragment. I implemented this on an Activity and it works. But when its in another Fragment the whole thing crashes and the erros messages tells me nothing:
07-01 12:58:20.210: E/AndroidRuntime(10146): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
Here is my code:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_tabwrapper, container);
List<Fragment> fragments = getFragments();
pageAdapter = new MyPageAdapter(getActivity()
.getSupportFragmentManager(), fragments);
pager = (ViewPager) v.findViewById(R.id.viewpager);
pager.setAdapter(pageAdapter); // <- CRASH!
return v;
}
BTW: The whole thing is based on this tutorial: http://architects.dzone.com/articles/android-tutorial-using
This error occurs beacuse you have to remove all views before set adapter in view pager so get right way..... So check this:
MyPageAdapter pageAdapter ;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_tabwrapper, container);
List<Fragment> fragments = getFragments();
pageAdapter = new MyPageAdapter(getActivity()
.getSupportFragmentManager(), fragments);
pager = (ViewPager) v.findViewById(R.id.viewpager);
pager.removeallviews();
pager.setAdapter(pageAdapter); // <- CRASH!
return v;
}
you should not use the ViewGroup that onCreateView provides as container to put your inflated view:
Change
View v = inflater.inflate(R.layout.fragment_tabwrapper, container);
to
View v = inflater.inflate(R.layout.fragment_tabwrapper, null);
This might shed a little light on the topic: http://developer.android.com/about/versions/android-4.2.html#NestedFragments
IMHO: I don't understand why developers put up with these tools. I find them impossible to work with. No wonder there are so many low-quality apps on the Play store. I'm looking forward to the day this project is done. Won't be working with this OS anytime soon again ...
Just created a new project in the newest ADT release in Eclipse and found that it will setup up certain environments for you to get things started. I choose Tabs + Swipe.
It has this code I have question on:
public static class DummyFragment extends Fragment {
public DummyFragment () {
}
public static final String ARG_SECTION_NUMBER = "section_number";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
TextView textView = new TextView(getActivity());
textView.setGravity(Gravity.CENTER);
Bundle args = getArguments();
textView.setText(Integer.toString(args.getInt(ARG_SECTION_NUMBER)));
return textView;
}
}
Both tabs refer to this same fragment. All it does is switch the content on the TextView that has the tab position number on it (1,2, or 3).
The more advanced question first: I want two different Fragments that the tab switches to. In the example code, it points to the same fragment. Where does this change take place? and can I see brief code example?
Easier question: I have two pre-defined XML layouts I'd like to set each tab (or Fragment) with. Do I do this in the actual Fragment? And if so, where? setContentView does't seem to be working in the onCreateView method?
Not really sure what this question is asking exactly, but if I understand correctly the TabHost (or whatever you are using to manage the Fragment tabs) is instantiating multiple instances of the DummyFragment and then attaching each to the screen when a tab is clicked. This is all done behind the scenes... all you need to worry about is implementing the Fragment and telling the TabHost when it should be instantiated/displayed.
Fragments don't have a setContentView method. You should inflate your Fragment's layout from xml in onCreateView. For instance with,
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_layout, container, false);
}