I created a ViewPager that uses individual Fragments. There are 3, here is an example of one of them:
public class PainFragment extends Fragment {
private TextView mTxtScale;
private Button mBtnMinus;
private Button mBtnPlus;
private int mScale;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pain, container, false);
mTxtScale = (TextView)v.findViewById(R.id.scale);
mBtnMinus = (Button)v.findViewById(R.id.minus);
mBtnPlus = (Button)v.findViewById(R.id.plus);
mScale = Integer.valueOf(mTxtScale.getText().toString());
mBtnMinus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mScale--;
if(mScale == -1) {
mScale = 9;
}
mTxtScale.setText(String.valueOf(mScale));
}
});
mBtnPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mScale++;
if(mScale == 10) {
mScale = 0;
}
mTxtScale.setText(String.valueOf(mScale));
}
});
return v;
}
public static PainFragment newInstance(String text) {
PainFragment f = new PainFragment();
Bundle b = new Bundle();
//b.putString("msg", text);
f.setArguments(b);
return f;
}
public int getScale() {
int scale = Integer.valueOf(mTxtScale.getText().toString());
return scale;
}
And I instantiated the ViewPager in my MainFragment:
public class MainFragment extends Fragment {
Entry mEntry = new Entry();
ViewPager mPager;
JournalPagerAdapter mAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_screen, container, false);
mPager = (ViewPager)rootView.findViewById(R.id.pager);
mPager.setOffscreenPageLimit(2); // So all 3 pages are loaded at once.
mAdapter = new JournalPagerAdapter(getActivity().getSupportFragmentManager());
mPager.setAdapter(mAdapter);
...
I have button click listeners in the ViewPager Fragments. I would like to know the best way to set up a listener so that my main fragment can detect when a button is pressed on one of the ViewPager fragments.
/** Update - Here is my adapter class **/
public class JournalPagerAdapter extends FragmentPagerAdapter {
SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();
public JournalPagerAdapter(FragmentManager mgr) {
super(mgr);
}
#Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return PainFragment.newInstance("PainFragment");
case 1: return StressFragment.newInstance("StressFragment");
case 2: return SleepFragment.newInstance("SleepFragment");
default: return PainFragment.newInstance("PainFragment");
}
}
#Override
public int getCount() {
return 3;
}
/* Thanks to Streets of Boston (http://stackoverflow.com/questions/8785221/retrieve-a-fragment-from-a-viewpager)
* for the next 3 methods, should include in all PagerAdapters. Let's you get the fragment instances by position */
#Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
registeredFragments.remove(position);
super.destroyItem(container, position, object);
}
public Fragment getRegisteredFragment(int position) {
return registeredFragments.get(position);
}
}
Second answer with pseudo example of using a ClickListener instead of the Callback. This should let you keep all logic out of the Activity.
Implement OnClickListener interface in MainFragment. Add a OnClickListener to your JournalPagerAdapter constructor. Presumably the Adapter is creating the PainFragments. Add OnClickListener to PainFragment newInstance and have the Adapter provide it when it creates each PainFragment.
public class PainFragment extends Fragment {
private TextView mTxtScale;
private Button mBtnMinus;
private Button mBtnPlus;
private int mScale;
protected OnClickListener mainClickListener;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pain, container, false);
mTxtScale = (TextView)v.findViewById(R.id.scale);
mBtnMinus = (Button)v.findViewById(R.id.minus);
mBtnPlus = (Button)v.findViewById(R.id.plus);
mScale = Integer.valueOf(mTxtScale.getText().toString());
mBtnMinus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mScale--;
if(mScale == -1) {
mScale = 9;
}
mTxtScale.setText(String.valueOf(mScale));
mainClickListener.onClick(view);
}
});
mBtnPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mScale++;
if(mScale == 10) {
mScale = 0;
}
mTxtScale.setText(String.valueOf(mScale));
mainClickListener.onClick(view);
}
});
return v;
}
public static PainFragment newInstance(String text, OnClickListener onClickListener) {
PainFragment f = new PainFragment();
f.mainClickListener = onClickListener;
Bundle b = new Bundle();
//b.putString("msg", text);
f.setArguments(b);
return f;
}
public int getScale() {
public class MainFragment extends Fragment implements OnClickListener {
Entry mEntry = new Entry();
ViewPager mPager;
JournalPagerAdapter mAdapter;
#Override
public void onClick(View v)
{
// TODO Auto-generated method stub
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_screen, container, false);
mPager = (ViewPager)rootView.findViewById(R.id.pager);
mPager.setOffscreenPageLimit(2); // So all 3 pages are loaded at once.
mAdapter = new JournalPagerAdapter(getActivity().getSupportFragmentManager(), this);
mPager.setAdapter(mAdapter);
...
public class JournalPagerAdapter extends FragmentPagerAdapter {
SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();
private OnClickListener mOnClickListener;
public JournalPagerAdapter(FragmentManager mgr, OnClickListener onClickListener) {
super(mgr);
mOnClickListener = onClickListener;
}
#Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return PainFragment.newInstance("PainFragment", mOnClickListener);
case 1: return StressFragment.newInstance("StressFragment", mOnClickListener);
case 2: return SleepFragment.newInstance("SleepFragment", mOnClickListener);
default: return PainFragment.newInstance("PainFragment", mOnClickListener);
}
}
...
The proper way to achieve this is probably through the use of a callback. Your fragment would utilize a normal click listener which would then use a callback to communicate back to the hosting Activity.
See the Android docs regarding communicating from a Fragment back to the Activity; then the Activity can communicate it to other Fragments.
http://developer.android.com/guide/components/fragments.html#CommunicatingWithActivity
In some cases, you might need a fragment to share events with the activity. A good way to do that is to define a callback interface inside the fragment and require that the host activity implement it. When the activity receives a callback through the interface, it can share the information with other fragments in the layout as necessary.
Related
I am trying to refresh the current fragment in the tabbed layout of my viewpager. I have one fragment (UserProgressFragment) that creates the ViewPager and sets the adapter (UserProgressAdapter) along with creating tabbed layout.
In my UserProgressAdapter, in the getItem() method I am returning two other fragments, (UserWeightTrackerFragment and UserCalorieCounterFragment) based on which tab i am on.
My issue is how do i refresh the fragment and update its content/view from the UserCalorieCounterFragment on a button click, because access to the viewpager and adapter are set in the UserProgressFragment? I have considered notifyDataChange for the adapter but i dont know how to call this from this class as it is set up on the UserProgressFragment class. The purpose of wanting to refresh this page is to update a specific view which is a chart, if context is needed.
I have attached the code below:
UserProgressFragment
public class UserProgressFragment extends Fragment{
public static UserProgressFragment newInstance() {
return new UserProgressFragment();
}
public UserProgressFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_user_progress, container, false);
ViewPager viewPager = view.findViewById(R.id.progress_viewpager);
viewPager.setAdapter(new UserProgressTabsAdapter(getChildFragmentManager()));
TabLayout tabLayout = view.findViewById(R.id.progress_sliding_tabs);
tabLayout.setupWithViewPager(viewPager, true);
return view;
}
}
UserProgressTabsAdapter
public class UserProgressTabsAdapter extends FragmentStatePagerAdapter {
private static final int PAGE_COUNT = 2;
private String tabTitles[] = new String[]{"Weight Tracker", "Calorie Counter"};
public UserProgressTabsAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return UserWeightTrackerFragment.newInstance(position);
case 1:
return UserCalorieCounterFragment.newInstance(position + 1);
}
return null;
}
#Override
public int getCount() {
return PAGE_COUNT;
}
#Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
return tabTitles[position];
}
UserCalorieCounterFragment (need to refresh this one)
public class UserCalorieCounterFragment extends Fragment implements View.OnClickListener, AdapterView.OnItemSelectedListener {
public static final String ARG_PAGE = "ARG_PAGE";
public static UserCalorieCounterFragment newInstance(int page) {
Bundle args = new Bundle();
args.putInt(ARG_PAGE, page);
UserCalorieCounterFragment fragment = new UserCalorieCounterFragment();
fragment.setArguments(args);
return fragment;
}
public UserCalorieCounterFragment() {
// Required empty public constructor
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
int mPage = getArguments().getInt(ARG_PAGE);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_user_calorie_counter, container, false);
Button mAddCalories = view.findViewById(R.id.btn_add_calorie);
mAddCalories.setOnClickListener(this);
return view;
}
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_add_calorie:
//REFRESH/UPDATE HERE
break;
}
}
You can create a public method in your fragment which contains the view pager which will contain the notifyDataSetChanged() function. And in the view pager fragment/item, you can call getParentFragment() and type cast it to your parent/first fragment and access that public method to notifyDataSetChanged().
My app have a fragmentActivity with tabBar which control over the view pager and contain 3 fragments ,when i update my class User in fragmentB,i need to display him in fragmentC.
my question is how to refresh fragmentC every time when i add new User.
before i wrote this question i tried all the solution from this questions:
1.Update ViewPager dynamically?
2.refresh fragment at reload
3.Update Fragment from ViewPager
4.ViewPager PagerAdapter not updating the View
5.How to update fragment content from activity (viewpager)?
here is my code
FragmentActivity:
public class MainActivityTab extends FragmentActivity {
public SectionsPagerAdapter mSectionsPagerAdapter;
public ViewPager mViewPager;
public static MainActivityTab instance = null;
public static MainActivityTab getInstance(){
return instance;
}
#Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_tab);
getWindow().setStatusBarColor(Color.rgb(191,76,12));
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
final TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.icon_A);
tabLayout.getTabAt(1).setIcon(R.drawable.icon_B);
tabLayout.getTabAt(2).setIcon(R.drawable.icon_C);
mViewPager.setCurrentItem(1,false);
}
FragmentStatePagerAdapter:
public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
return FragmentA.newInstance();
case 1:
return FragmentA.newInstance();
case 2:
return FragmentC.newInstance();
default:
return null;
}
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
return null;
}
}
FragmentB:
public class FragmentB extends Fragment {
EditText name;
EditText age;
Button btnSave;
public static FragmentB newInstance() {
FragmentB fragment = new FragmentB();
return fragment;
}
public FragmentB() {}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_new2, container, false);
name = (EditText) rootView.findViewById(R.id.name);
age = (EditText) rootView.findViewById(R.id.age);
btnSave = (Button) rootView.findViewById(R.id.btnSave);
btnSave.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
UserManager.getInstance().creteUser(name.getText().toString(),age.getText().toString());
}
});
return rootView;
}
}
FragmentC:
public class FragmentC extends Fragment {
TextView nameTxt;
TextView ageTxt;
public static FragmentC newInstance(){
FragmentC instance = new FragmentC();
return instance;
}
public FragmentC(){
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_new3, container, false);
nameTxt = (TextView) rootView.findViewById(R.id.nameTxt);
ageTxt = (TextView) rootView.findViewById(R.id.ageTxt);
showUser();
return rootView;
}
public void showUser(){
if(UserManager.getInstance().getUser().getName()!=null){
nameTxt.setText(UserManager.getInstance().getUser().getName().toString());
ageTxt.setText(UserManager.getInstance().getUser().getAge().toString());
}
}
}
You could create a callback like:
public interface UserChangedCallback{
void onUserChanged();
}
and implement this callback on every view/fragment where you want to access the user:
#Override
public void onUserChanged() {
adapter.notifyDataSetChanged();
// or if you don't have an adapter refresh your textfields or whatever you want
}
Register the callback on the usermanager via UserManager.getInstance().registerCallback(this). Internally the usermanager have to add the callback to an internal list.
Create a private function inside your usermanager:
private void notifyCallbacks() {
for(UserChangedCallback callback : registeredCallbacks) {
callback.onUserChanged();
}
}
If you add/modify/delete a user you always have to call this function at the end. For example:
public void addUser(User user) {
users.add(user);
notifiCallbacks();
}
Now every view will be notified and refreshed.
Important!
Don't forget to unregister the callback from the usermanager on onDestroy() to avoid memory leaks.
Found solution:
i used in the method onPageSelected,when position is 2 my fragment detach and afterwards attach the fragment.
working perfectly!
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if(position==2){
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction().add(R.id.fragmant_new3, FragmentC.newInstance());
fragmentTransaction.detach(FragmentC.newInstance());
fragmentTransaction.attach(FragmentC.newInstance());
fragmentTransaction.commit();
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
Below is my Code.
Using ViewPager I have made 2 XML file for two Pages and their Class file.
Now I need if I click on First Screen of ViewPager, a new activity should launch.
I got 2 pages, so If I Click First Screen, A.class intent Called. If I click on Second Screen, B.class intent should be Called.
Codes:-
MainActvity:
public class MainActivity extends ActionBarActivity {
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.pager);
/** set the adapter for ViewPager */
mViewPager.setAdapter(new SamplePagerAdapter(
getSupportFragmentManager()));
}
/** Defining a FragmentPagerAdapter class for controlling the fragments to
be shown when user swipes on the screen. */
public class SamplePagerAdapter extends FragmentPagerAdapter {
public SamplePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
/** Show a Fragment based on the position of the current screen */
if (position == 0) {
return new SampleFragment();
} else
return new SampleFragmentTwo();
}
#Override
public int getCount() {
// Show 2 total pages.
return 2;
}
}
}
SampleFragment.java
public class SampleFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_one, null);
return rootView;
}
}
SampleFragmentTwo.java
public class SampleFragmentTwo extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_two, container,
false);
return rootView;
}
}
CustomSwipeAdapter:
public class CustomSwipeAdapter extends PagerAdapter {
#Override
public int getCount() {
return 0;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return false;
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
return super.instantiateItem(container, position);
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
}
}
As mentioned in one of the comments, In your fragment classes A and B put onClick listener on views and launch intent from there like below:
public class SampleFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_one, null);
rootView.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// do something when the button is clicked
Intent activityA = new Intent(getActivity(),ActivityA.class);
startActivity(activityA);
}
return rootView;
}
}
similarlly goes for your second fragment.
I have a project that needs to have two viewpager, each in a different fragment of the activity.
The architecture something like this
The problem is that when a pager view is inflated, the other isn't.
For example, the fragments 1, 2 and 3 can be accessed by clicking. When I click on the first fragment, it inflates the view pager with its two fragments perfectly, but if I click on the fragment 3, the view pager does not inflate the fragments and also the tabs get slower.
Opening the application process again, by clicking on the fragment 3 first, it works perfectly, but clicking on the first after, this problem happens again.
Already debugged the processes and there is nothing different.
My Activity
public class HomeActivity extends AppCompatActivity implements NavigationFragment.OnNavigationListener{
public NavigationFragment mNavigation;
private String mTagFragmentShowing = "";
private int currentNavigation = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
ButterKnife.bind(this);
mNavigation = (NavigationFragment) getFragmentManager().findFragmentById(R.id.manager_navigation);
onNavigationSelected(currentNavigation);
}
#Override
public void onNavigationSelected(int position) {
if (mTagFragmentShowing.equals(String.valueOf(position)))
return;
currentNavigation = position;
mNavigation.setNavigationSelected(position);
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment fragment = fragmentManager.findFragmentByTag(mTagFragmentShowing);
// Hide last fragment
if (fragment != null && fragment.isVisible()) {
fragmentManager.beginTransaction().hide(fragment).commit();
}
// Show new fragment
mTagFragmentShowing = String.valueOf(position);
fragment = fragmentManager.findFragmentByTag(mTagFragmentShowing);
if (fragment != null && fragment.isHidden()) {
fragmentManager.beginTransaction().show(fragment).commit();
} else if (fragment == null) {
fragmentManager.beginTransaction().add(R.id.manager_content, getFragmentByPosition(position), mTagFragmentShowing)
.setTransition(FragmentTransaction.TRANSIT_NONE).commit();
}
}
private Fragment getFragmentByPosition(int position) {
switch (position) {
case 0:
return new DiscoverFragment();
case 1:
return new UpcomingFragment();
case 2:
return new FeaturesFragment();
case 3:
return new VideosFragment();
case 4:
return new MySongsFragment();
}
return null;
}
My Navigation Fragment. It control the other fragments
public class NavigationFragment extends Fragment implements View.OnClickListener {
public ViewHolder mHolder;
public View mButtonSelected;
public OnNavigationListener mCallback;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.component_navigation, container, false);
ButterKnife.bind(this, view);
initView(view);
return view;
}
public void initView(View view) {
mHolder = new ViewHolder();
mHolder.discover = view.findViewById(R.id.component_navigation_discover);
mHolder.upcoming = view.findViewById(R.id.component_navigation_upcoming);
mHolder.features = view.findViewById(R.id.component_navigation_features);
mHolder.videos = view.findViewById(R.id.component_navigation_videos);
mHolder.mymusic = view.findViewById(R.id.component_navigation_mymusic);
mHolder.discover.setTag(0);
mHolder.upcoming.setTag(1);
mHolder.features.setTag(2);
mHolder.videos.setTag(3);
mHolder.mymusic.setTag(4);
mHolder.discover.setOnClickListener(this);
mHolder.upcoming.setOnClickListener(this);
mHolder.features.setOnClickListener(this);
mHolder.videos.setOnClickListener(this);
mHolder.mymusic.setOnClickListener(this);
mButtonSelected = mHolder.features;
}
public void setNavigationSelected(int position) {
setNavigationButtonSelected(false);
switch (position) {
case 0:
mButtonSelected = mHolder.discover;
break;
case 1:
mButtonSelected = mHolder.upcoming;
break;
case 2:
mButtonSelected = mHolder.features;
break;
case 3:
mButtonSelected = mHolder.videos;
break;
case 4:
mButtonSelected = mHolder.mymusic;
break;
}
setNavigationButtonSelected(true);
}
public void setNavigationButtonSelected(boolean enabled) {
mButtonSelected.setBackgroundColor(enabled ? getResources().getColor(R.color.color_red) : Color.TRANSPARENT);
}
#Override
public void onClick(View view) {
if (view != mButtonSelected) {
mCallback.onNavigationSelected((Integer) view.getTag());
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (OnNavigationListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnNavigationSelectedListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mCallback = null;
}
static class ViewHolder {
View discover;
View upcoming;
View features;
View videos;
View mymusic;
}
public interface OnNavigationListener {
public void onNavigationSelected(int position);
}
My Fragments with View Pager
public class MySongsFragment extends Fragment {
private OnFragmentInteractionListener mListener;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().getSupportFragmentManager().beginTransaction().add(R.id.mysongs_fragment_container, MySongsViewPagerFragment.newInstance(0)).commit();
return inflater.inflate(R.layout.fragment_my_songs, container, false);
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
My View Pager
public class MySongsViewPagerFragment extends Fragment {
private static final int NUM_PAGES = 4;
private String[] tab_names;
private List<String> mTabNames;
private PagerAdapter mPagerAdapter;
public #Bind(R.id.pager)
ViewPager mPager;
public static MySongsViewPagerFragment newInstance(int index) {
MySongsViewPagerFragment fragment = new MySongsViewPagerFragment();
Bundle args = new Bundle();
args.putInt("index", index);
fragment.setArguments(args);
return fragment;
}
#Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = initView(inflater, container);
return view;
}
#NonNull private View initView(LayoutInflater inflater, ViewGroup container) {
View view = inflater.inflate(R.layout.fragment_view_pager_my_songs, container, false);
ButterKnife.bind(this, view);
tab_names = getResources().getStringArray(R.array.tabs_mysongs);
mTabNames = Arrays.asList(tab_names);
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity().getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
mPager.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
mPager.onTouchEvent(event);
return false;
}
});
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mPager);
return view;
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override public Fragment getItem(int position) {
switch (position) {
case 0:
return new PlaylistsFragment();
case 1:
return new SongsFragment();
case 2:
return new AlbumsFragment();
case 3:
return new ArtistsFragment();
default:
return new PlaylistsFragment();
}
}
#Override public int getCount() {
return NUM_PAGES;
}
#Override public CharSequence getPageTitle(int position) {
return mTabNames.get(position);
}
}
The problem was activity context in viewpager
In My View Pagers. I change
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity().getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
to
mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
mPager.setAdapter(mPagerAdapter);
The two viewpager used the same context. So when I inflated the first, the other was not inflated because interpreted that already existed an inflated viewpager.
Thanks for the help mcwise for show me the method getChildFragmentManager().
I use the example of a pager enter link description here
I have everything worked out but there is one problem. I have 4 different fragments. One of them contains ListView. When I click on an item in the ListView, change the global variable guestId. If then return to other fragments, these they should be changed. Because they use this variable as a parameter. But they do not change.
public class Guest extends Fragment {
...
private ViewPager pager;
private MyPagerAdapter adapter;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.guest, null);
...
if (InternetResiver.isOnline(getActivity())) {
setData();
} else {
AlertDialog alert = InternetResiver.getAlertDialog(getActivity());
alert.show();
}
return v;
}
public void startNewTread(String newId) {
guestId = newId;
Log.d("usernewid",newId);
setData();
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return Folio.newInstance(guestId,hotel,room);
case 1: return BalanceDetail.newInstance(guestId,hotel);
case 2: return History.newInstance(guestId,hotel);
case 3: return Record.newInstance(guestId,hotel,room);
default: return Folio.newInstance(guestId,hotel,room);
}
}
#Override
public int getCount() {
return 4;
}
}
public void setData() {
String link = String.format(......., guestId, hotel);
new MyAsincTask(getActivity()){........}.execute(link);
}
}
my fragment
public class Folio extends Fragment {
private ArrayList<FolioBean> folioBeans;
private TableLayout tableFolio;
private String guestId;
private String hotel;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.folio, null);
guestId = getArguments().getString("guestid");
hotel = getArguments().getString("hotel");
folioBeans = new ArrayList<>();
tableFolio = (TableLayout) v.findViewById(R.id.tableFolio);
if (InternetResiver.isOnline(getActivity())) {
setData();
} else {
AlertDialog alert = InternetResiver.getAlertDialog(getActivity());
alert.show();
}
return v;
}
public static Folio newInstance(String guestid,String hotel,String room) {
Folio f = new Folio();
Bundle b = new Bundle();
b.putString("guestid", guestid);
b.putString("hotel", hotel);
b.putString("room", room);
f.setArguments(b);
return f;
}
public void setData() {
String link = String.format(........., guestId, hotel);
new MyAsincTask(getActivity()){........}.execute(link);
}
}
other fragments are loaded using the same guestId
It is because ViewPager cached fragments. You need use FragmentStatePagerAdapter instead FragmentPagerAdapter, and call notifydatasetchanged() after changing guestId, and override
Override getItemPosition in your PagerAdapter like this:
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
see similar questions
Refresh images on FragmentStatePagerAdapter on resuming activity