Develop Reference

Viewpager wrong OnItemClick position

My app has a fragment that host a nested viewPager (One fragment added every time) all views are linked to the same layout.
Each fragment has a fixed button + recylerview that retrieve its data from firebase adapter.
When I click on the button, it show the correct viewPager position. But if I click on the listview item (viewHolder) it show the next pre-loaded position in the viewPager.
here's the viewpager and the pager adapter of the root fragment
Explore.java
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_explore, container, false);
array = controller.SELECTED_CATEGORIES;
viewPager = (ViewPager) root.findViewById(R.id.viewPager);
tabLayout = (TabLayout) root.findViewById(R.id.categories_tablayout);
tabLayout.setupWithViewPager(viewPager);
mAdapter = new MyAdapter(getFragmentManager());
viewPager.setAdapter(mAdapter);
return root;
}
public static class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return controller.SELECTED_CATEGORIES.length;
}
#Override
public Fragment getItem(int position) {
return CategoriesFragment.newInstance(position);
}
#Override
public CharSequence getPageTitle(final int position) {
return controller.SELECTED_CATEGORIES[position];
}
}
CategoriesFragment.java
static CategoriesFragment newInstance(int num) {
CategoriesFragment f = new CategoriesFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_categories, container, false);
initialize();
listCategoriesFeed = (RecyclerView) rootView.findViewById(R.id.listCategoriesFeeds);
categoriesFeedAdapter = new CategoriesFeedAdapter(CategoriesFeedItem.class, R.layout.categoriesfeed_list_item, CategoriesFeedHolder.class, myref);
llm = new LinearLayoutManager(rootView.getContext());
llm.setOrientation(LinearLayoutManager.VERTICAL);
listCategoriesFeed.setLayoutManager(llm);
listCategoriesFeed.setAdapter(categoriesFeedAdapter);
swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout);
swipeRefreshLayout.setOnRefreshListener(this);
//Holder itemClickListener
CategoriesFeedHolder.registerOnItemClickListener(this);
//TextView onclick listener
View tv = rootView.findViewById(R.id.text);
((TextView)tv).setText("Fragment #" + mNum);
tv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.e("position",mNum + "");
}
});
return rootView;
}
#Override
public void onItemClick(View view, int position) {
super.onItemClick(view, position);
switch (view.getId()) {
case R.id.firstId:
Log.e("position",mNum+ "");
break;
case R.id.secondId:
secondAction....
.....
.....
.....
break;
}
}
private void initialize() {
controller.showProgressDialog();
list = controller.getIniCategoriesDetailsList();
list.clear();
controller.categoriesDetailsList.put(controller.SELECTED_CATEGORIES[mNum],list);
reference = FirebaseDatabase.getInstance().getReference("firebase-path/" + controller.SELECTED_CATEGORIES[mNum]);
myref = reference.orderByChild("order-by").limitToFirst(i);
myref.addChildEventListener(this);
}
CategoriesFeedHolder.java
private CategoriesFeedItem model;
private final ImageView mImage;
private static OnItemClickListener onItemClickListener;
public CategoriesFeedHolder(View itemView) {
super(itemView);
this.context = itemView.getContext();
mImage = (ImageView) itemView.findViewById(R.id.m_image);
mImage.setOnClickListener(this);
}
public static void registerOnItemClickListener(OnItemClickListener onItemClickListener) {
CategoriesFeedHolder.onItemClickListener = onItemClickListener;
}
public void setModel(CategoriesFeedItem model) {
this.model = model;
}
#Override
public void onClick(View view) {
onItemClickListener.onItemClick(view, getAdapterPosition());
}
Does anyone know why this happens?

The problem was with the viewholder class, there was no data binding inside it. So when i clicked on any item inside the viewholder, it performed the action on the current adapter's data (preloaded data).
the viewholder class should be something like this:
public ViewHolder(View itemView) {
super(itemView);
share = (ImageView) itemView.findViewById(R.id.share);
}
public void bindToPost(Post post, View.OnClickListener onClickListener) {
share.setOnClickListener(onClickListener);
}

Click On An Item In RecyclerView Contained In A Fragment To Open New Activity With Passed Data

I have a MainActivity and Three Fragments with recyclerViews inside the three fragments, the recyclerview contain two textviews, i want the user to click on the recyclerview and the text in should be passed on to the new activity, i am a little bit new so i would appreciate it if you can give me detailed code and some explanation.
I want to click on an item in the recyclerview and that should open a new activity, data(text) should be passed from the recyclerview to the new activity.
Here is my code for the HymnModel.java
public class HymnModel {
String title;
String song;
HymnModel(String title, String song){
this.title=title;
this.song=song;
}
public String getTitle() {return title;
}
public String getSong() {
return song;
}
}
Here is the code for ItemVeiwHolder.java
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
import com.tutorialsbuzz.recyclerview.R;
public class ItemViewHolder extends RecyclerView.ViewHolder {
public TextView title_textview;
public TextView song_textview;
public ItemViewHolder(View itemView) {
super(itemView);
itemView.setClickable(true);
title_textview = (TextView) itemView.findViewById(R.id.song_title);
song_textview = (TextView) itemView.findViewById(R.id.song);
}
public void bind(HymnModel hymnModel) {
title_textview.setText(hymnModel.getTitle());
song_textview.setText(hymnModel.getSong());
}
}
Here is my Adapter class
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.tutorialsbuzz.recyclerview.R;
import java.util.ArrayList;
import java.util.List;
public class RVAdapter extends RecyclerView.Adapter<ItemViewHolder> {
private List<HymnModel> mCountryModel;
private List<HymnModel> mOriginalCountryModel;
public RVAdapter(List<HymnModel> mCountryModel) {
this.mCountryModel = mCountryModel;
this.mOriginalCountryModel = mCountryModel;
}
#Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int i) {
final HymnModel model = mCountryModel.get(i);
itemViewHolder.bind(model);
}
#Override
public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, viewGroup, false);
return new ItemViewHolder(view);
}
#Override
public int getItemCount() {
return mCountryModel.size();
}
public void setFilter(List<HymnModel> countryModels){
mCountryModel = new ArrayList<>();
mCountryModel.addAll(countryModels);
notifyDataSetChanged();
}
}
Here is the code for one my fragments
public class TabOneFragment extends Fragment implements SearchView.OnQueryTextListener {
private RecyclerView recyclerview;
private List<HymnModel> mHymnModel;
private RVAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_one_fragment, container, false);
recyclerview = (RecyclerView) view.findViewById(R.id.recyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerview.setLayoutManager(layoutManager);
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
int numOfSongs = 32;
DisplayMetrics metrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
String [] titles = {HymnTitles.hymnTitle1, HymnTitles.hymnTitle2, HymnTitles.hymnTitle3, HymnTitles.hymnTitle4, HymnTitles.hymnTitle5,
HymnTitles.hymnTitle6, HymnTitles.hymnTitle7, HymnTitles.hymnTitle8, HymnTitles.hymnTitle9, HymnTitles.hymnTitle10, HymnTitles.hymnTitle11,
HymnTitles.hymnTitle12};
String [] songs = {Hymns.hymn1.substring(width/5), Hymns.hymn2, Hymns.hymn3, Hymns.hymn4, Hymns.hymn5, Hymns.hymn6, Hymns.hymn7, Hymns.hymn8, Hymns.hymn9, Hymns.hymn10, Hymns.hymn11, Hymns.hymn12};
mHymnModel = new ArrayList<>();
for (int i = 0; i < titles.length; i++) {
mHymnModel.add(new HymnModel(i + "." + " " + titles[i], " " + songs[i]));
}
adapter = new RVAdapter(mHymnModel);
recyclerview.setAdapter(adapter);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
MenuItemCompat.setOnActionExpandListener(item,
new MenuItemCompat.OnActionExpandListener() {
#Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Do something when collapsed
adapter.setFilter(mHymnModel);
return true; // Return true to collapse action view
}
#Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true; // Return true to expand action view
}
});
}
#Override
public boolean onQueryTextChange(String newText) {
final List<HymnModel> filteredModelList = filter(mHymnModel, newText);
adapter.setFilter(filteredModelList);
return true;
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
private List<HymnModel> filter(List<HymnModel> models, String query) {
query = query.toLowerCase();
final List<HymnModel> filteredModelList = new ArrayList<>();
for (HymnModel model : models) {
final String text = model.getSong().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
return filteredModelList;
}
}
My MainActivity
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_action_person,
R.drawable.ic_action_group,
R.drawable.ic_action_call
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tablayout);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new TabOneFragment(), "Tab 1");
adapter.addFragment(new TabTwoFragment(), "Tab 2");
adapter.addFragment(new TabThreeFragment(), "Tab 3");
viewPager.setAdapter(adapter);
}
}
And lastly my ViewPageAdapter
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
}
Thank You.

Create an interface
public interface OnHymnClickListener {
void onHymnClick(HymnModel hymnModel);
}
Pass the listener to the adapter
public class RVAdapter extends RecyclerView.Adapter<ItemViewHolder> {
private OnHymnClickListener listener;
public void setListener(OnHymnClickListener listener) {
this.listener = listener;
}
#Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int i) {
final HymnModel model = mCountryModel.get(i);
itemViewHolder.bind(model);
itemViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(listener != null) {
listener.onHymnClick(model);
}
}
});
}
}
Let your fragment implement it
public class TabOneFragment extends Fragment implements SearchView.OnQueryTextListener, OnHymnClickListener {
#Override
public void onHymnClick(HymnModel hymnModel) {
//put data to bundle and startActivity
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
adapter = new RVAdapter(mHymnModel);
adapter.setListener(this);
recyclerview.setAdapter(adapter);
}
}

Hello first of all you always want to start your activity from activity or fragment.
Never start it from adapter.
So in your adapter constructor add this
public AdapterName(......,Context context){
...your code.
this.mContext=context;
}
pass context there.
and than inside this method
public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
view.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(mContext instanceof YourActivityName){
((YourActivityName)mContext).yourDesiredMethod();
}
}
});

ViewPager does not updating the Fragment with updated content

i am suffering for 3 days. I'm using the View Pager from the compatibility library. I have successfully got it displaying several views .My Problem is that when i swap view then do not update data by fragment in its recycler view .But when i closed my application then opened fragments display update content by recycler view.i use all method like setnotifydatachanged() and many more but Fragment in viewpager does not update content.Thankx For any help
this is my main activity
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
private TabLayout tabLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("");
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.viewPager);
viewPager.setAdapter(new MainAdapter(getSupportFragmentManager(),MainActivity.this));
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
addIconsToTab();
}
private void addIconsToTab() {
for (int i = 0; i < tabLayout.getTabCount(); i++) {
int drwableId = -1;
switch (i) {
case 0:
drwableId = R.drawable.home;
break;
case 1:
drwableId = R.drawable.favourite;
break;
case 2:
drwableId = R.drawable.watchlater;
break;
}
tabLayout.getTabAt(i).setIcon(drwableId);
}
}
}
this is my main adapter
public class MainAdapter extends FragmentPagerAdapter {
Context mContext;
public MainAdapter(FragmentManager fm, Context context) {
super(fm);
mContext=context;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new AllVideos();
case 1:
return new Favourite();
case 2:
return new WatchLater();
default:
return null;
}
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return mContext.getString(R.string.All_Videos);
case 1:
return mContext.getString(R.string.Favourite);
case 2:
return mContext.getString(R.string.Wtach_Later);
default:
return null;
}
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
And this is my Fragment
public class Favourite extends Fragment {
private RecyclerView mRecyclerView;
private FavouriteAdapter favouriteAdapter;
RecyclerView.LayoutManager layoutManager;
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_recyclerview_carpaccio, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
layoutManager = new LinearLayoutManager(getActivity());
DatabaseHandler db = new DatabaseHandler(getActivity());
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.setHasFixedSize(true);
List<VideoInformationDataModel> videoinfo = db.getAllFavourite();
favouriteAdapter = new FavouriteAdapter(getActivity(),videoinfo);
mRecyclerView.setAdapter(favouriteAdapter);
favouriteAdapter.notifyDataSetChanged();
Toast.makeText(getActivity(),videoinfo.size()+"",Toast.LENGTH_SHORT).show();
}
}
And this is fragmentAdapter
public class FavouriteAdapter extends RecyclerView.Adapter<FavouriteAdapter.MyViewHolder>
{
private int[] maid = {R.id.deleteoption};
Context context;
private List<VideoInformationDataModel> videoInformationDataModels;
String videoid1;
private FavouriteAdapter favouriteAdapter;
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView title;
View root;
protected ImageLoader img_uni_imageLoader;
DatabaseHandler db = new DatabaseHandler(context);
ImageView networkImage,options;
TextView Duration,Videoname;
public MyViewHolder(View view) {
super(view);
root = itemView.findViewById(R.id.videoImage);
Duration= (TextView) itemView.findViewById(R.id.duration);
Videoname= (TextView) itemView.findViewById(R.id.VideoName);
networkImage= (ImageView) itemView. findViewById(R.id.imgNetwork);
options= (ImageView) itemView.findViewById(R.id.deleteoption);
options.setOnClickListener(this);
}
#Override
public void onClick(View view) {
if (maid[0] == view.getId()) {
PopupMenu popup = new PopupMenu(context, options);
popup.getMenuInflater().inflate(R.menu.deleteoption, popup.getMenu());
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId())
{
case R.id.delete:
int pos = getAdapterPosition () ;
videoid1= videoInformationDataModels.get(pos).getVideoid();
db.deleteFavourite(videoid1);
videoInformationDataModels.remove(pos);
notifyItemRemoved(pos);
notifyItemRangeChanged(pos, getItemCount());
return true;
}
return false;
}
});
popup.show();
}
}
}
public FavouriteAdapter(Context context, List<VideoInformationDataModel> videoinformation) {
this.videoInformationDataModels = videoinformation;
this.context=context;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.favouritesingleitem, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.Duration.setText(videoInformationDataModels.get(position).getVideoduratio n());
holder.Videoname.setText(videoInformationDataModels.get(position).getVideoinfo() );
holder.img_uni_imageLoader = ImageLoader.getInstance();
.img_uni_imageLoader.init(ImageLoaderConfiguration.createDefault(context));
holder.img_uni_imageLoader.displayImage(videoInformationDataModels.get(position) .getVideoimg(), holder.networkImage);
holder.root.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(context, YouTube.class);
Bundle extras = new Bundle();
String Videtittle = videoInformationDataModels.get(position).getVideoinfo();
String videodes = videoInformationDataModels.get(position).getFld_description();
String duration = videoInformationDataModels.get(position).getVideoduration();
String videoid = videoInformationDataModels.get(position).getVideoid();
extras.putString("Videtittle", Videtittle);
extras.putString("videodes", videodes);
extras.putString("duration", duration);
extras.putString("videoid", videoid);
intent.putExtras(extras);
context.startActivity(intent);
}
});
}
#Override
public int getItemViewType(int position)
{
return position;
}
public int getItemCount() {
return videoInformationDataModels.size();
}
}

I am not very sure what issue you are facing, but can you try once by replacing the FragmentPagerAdapter by FragmentStatePagerAdapter (extending by MainAdapter).

I don't clearly understand exactly what your issue is, It might be a result of wrong implementation. But if you have tried favouriteAdapter.notifyDataSetChanged(); and it still doesn't refresh.
You might as well remove the view, refresh it and add the view back and see if that works.
ViewGroup parent = (ViewGroup) viewPager.getParent(); // get the view parent
if (parent != null) {
parent.removeView(viewPager); // remove the view
viewPager.getAdapter().notifyDataSetChanged(); // notify that the data has changed
parent.addView(viewPager); // then, re-add the view
}

Android RecyclerView adapter with fragment null pointer exception

Hi I am new to Android and get a problem with Recycler View and fragment.
There are 3 fragments that can swipe, and there is a recycler view with an adapter that is in the fragment. I got a sample code from http://developer.android.com/training/implementing-navigation/lateral.html but I get null pointer exception in List object. Thanks in advance. My code is showed below:
public class TripHistoryActivity extends FragmentActivity implements ActionBar.TabListener{
private static final String TAG = "TripHistoryActivity";
private CommonDBHelper commonDBHelper;
private List<Trip> allTrips;
private ArrayList<Trip> currentTrips;
private ArrayList<Trip> pastTrips;
private ArrayList<Trip> futureTrips;
AppSectionsPagerAdapter mAppSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_trip_history);
commonDBHelper = new CommonDBHelper(this);
TripDBHelper tripDBHelper = new TripDBHelper(commonDBHelper.getWritableDatabase());
allTrips = tripDBHelper.getAllTrips();
currentTrips = new ArrayList<>();
pastTrips = new ArrayList<>();
futureTrips = new ArrayList<>();
Calendar calendar = Calendar.getInstance();
int currentDay = calendar.get(calendar.DAY_OF_MONTH);
int currentMonth = calendar.get(calendar.MONTH);
int currentYear = calendar.get(calendar.YEAR);
for (Trip trip : allTrips) {
String date = trip.getTime().substring(0, trip.getTime().indexOf(" "));
String[] dates = date.split("/");
if (currentYear < Integer.valueOf(dates[2])) {
futureTrips.add(trip);
}
else if (currentYear > Integer.valueOf(dates[2])
|| currentMonth > Integer.valueOf(dates[0])
|| currentDay > Integer.valueOf(dates[1])) {
pastTrips.add(trip);
}
else {
currentTrips.add(trip);
}
}
mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager());
final ActionBar actionBar = getActionBar();
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mAppSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// When swiping between different app sections, select the corresponding tab.
// We can also use ActionBar.Tab#select() to do this if we have a reference to the
// Tab.
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by the adapter.
// Also specify this Activity object, which implements the TabListener interface, as the
// listener for when this tab is selected.
actionBar.addTab(
actionBar.newTab()
.setText(mAppSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary
* sections of the app.
*/
public class AppSectionsPagerAdapter extends FragmentPagerAdapter {
public AppSectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public android.support.v4.app.Fragment getItem(int i) {
switch (i) {
case 0:
android.support.v4.app.Fragment currentTripsFragment = new CurrentTripsFragment();
Bundle currentTripsBundle = new Bundle();
currentTripsBundle.putParcelableArrayList("currentTrips", currentTrips);
currentTripsFragment.setArguments(currentTripsBundle);
return currentTripsFragment;
case 1:
android.support.v4.app.Fragment pastTripsFragment = new PastTripsFragment();
Bundle pastTripsBundle = new Bundle();
pastTripsBundle.putParcelableArrayList("pastTrips", pastTrips);
pastTripsFragment.setArguments(pastTripsBundle);
return pastTripsFragment;
default:
android.support.v4.app.Fragment futureTripsFragment = new FutureTripsFragment();
Bundle futureTripsBundle = new Bundle();
futureTripsBundle.putParcelableArrayList("futureTrips", futureTrips);
futureTripsFragment.setArguments(futureTripsBundle);
return futureTripsFragment;
}
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Current Trips";
case 1:
return "Past Trips";
case 2:
return "Future Trips";
default:
return "Fault";
}
}
}
/**
* A fragment that launches other parts of the demo application.
*/
public static class CurrentTripsFragment extends android.support.v4.app.Fragment {
private RecyclerView mRecyclerView;
private Context context;
List<Trip> currentTrips;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_current_trips, container, false);
context = rootView.getContext();
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
currentTrips = getArguments().getParcelableArrayList("currentTrips");
Log.d(TripHistoryActivity.TAG, String.valueOf(currentTrips == null));
RecyclerView.LayoutManager manager = new LinearLayoutManager(context);
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
CardViewAdapter cardViewAdapter = new CardViewAdapter(currentTrips);
mRecyclerView.setAdapter(cardViewAdapter);
cardViewAdapter.setOnItemClick(new CardViewAdapter.OnItemClick() {
#Override
public void onItemClick(int position) {
handleItemClick(position);
}
});
return rootView;
}
public void handleItemClick (int position) {
Toast.makeText(context, "Clicked " + position, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, ViewTripActivity.class);
intent.putExtra("trip", currentTrips.get(position));
startActivity(intent);
}
}
There are 2 other fragments that are same as this one so I omit them.
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.nyu.cs9033.eta.R;
import com.nyu.cs9033.eta.models.Trip;
import java.util.List;
/**
* Created by Ray on 2016/4/2.
*/
public class CardViewAdapter extends RecyclerView.Adapter<CardViewAdapter.CardViewHolder> {
private final List<Trip> trips;
public CardViewAdapter (List<Trip> trips) {
this.trips = trips;
}
public interface OnItemClick {
public void onItemClick(int position);
}
private OnItemClick onItemClick;
public void setOnItemClick (OnItemClick onItemClick) {
this.onItemClick = onItemClick;
}
#Override
public CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.history_list_item, parent, false);
return new CardViewHolder(view);
}
#Override
public void onBindViewHolder(final CardViewHolder holder, final int position) {
holder.name.setText(trips.get(position).getName());
holder.location.setText(trips.get(position).getLocation());
holder.time.setText(trips.get(position).getTime());
if (onItemClick != null) {
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onItemClick.onItemClick(position);
}
});
}
}
#Override
public int getItemCount() {
return trips.size();
}
class CardViewHolder extends RecyclerView.ViewHolder {
private TextView name;
private TextView location;
private TextView time;
public CardViewHolder (View view) {
super(view);
name = (TextView) view.findViewById(R.id.card_trip_name);
location = (TextView) view.findViewById(R.id.card_trip_location);
time = (TextView) view.findViewById(R.id.card_trip_time);
}
}
}
This is what logcat says:
FATAL EXCEPTION: mainProcess: com.nyu.cs9033.eta, PID: 14018
java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()'
on a null object reference
at com.nyu.cs9033.eta.adapters.CardViewAdapter.getItemCount(CardViewAdapter.java: 57)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java: 2357)
at android.view.View.measure(View.java: 18796)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java: 715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java: 461)
at android.view.View.measure(View.java: 18796)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java: 5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java: 194)
at android.view.View.measure(View.java: 18796)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java: 1488)
at android.view.View.measure(View.java: 18796)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java: 5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java: 194)
at android.view.View.measure(View.java: 18796)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java: 5951)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java: 446)
at android.view.View.measure(View.java: 18796)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java: 5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java: 194)
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java: 2643)
at android.view.View.measure(View.java: 18796)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java: 2108)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java: 1224)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java: 1460)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java: 1115)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java: 6023)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java: 858)
at android.view.Choreographer.doCallbacks(Choreographer.java: 670)
at android.view.Choreographer.doFrame(Choreographer.java: 606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java: 844)
at android.os.Handler.handleCallback(Handler.java: 739)
at android.os.Handler.dispatchMessage(Handler.java: 95)
at android.os.Looper.loop(Looper.java: 148)
at android.app.ActivityThread.main(ActivityThread.java: 5422)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 616)

You should get bundle from onCreate() instead of onCreateView(). Try the below change in your Fragment class:
public static class CurrentTripsFragment extends android.support.v4.app.Fragment {
private RecyclerView mRecyclerView;
private Context context;
List<Trip> currentTrips;
#Override
public void onCreate(Bundle savedInstanceState){
super().onCreate(savedInstanceState);
if(getArguments()!= null){
currentTrips = getArguments().getParcelableArrayList("currentTrips");
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_current_trips, container, false);
context = rootView.getContext();
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
Log.d(TripHistoryActivity.TAG, String.valueOf(currentTrips == null));
RecyclerView.LayoutManager manager = new LinearLayoutManager(context);
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
CardViewAdapter cardViewAdapter = new CardViewAdapter(currentTrips);
mRecyclerView.setAdapter(cardViewAdapter);
cardViewAdapter.setOnItemClick(new CardViewAdapter.OnItemClick() {
#Override
public void onItemClick(int position) {
handleItemClick(position);
}
});
return rootView;
}
public void handleItemClick (int position) {
Toast.makeText(context, "Clicked " + position, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, ViewTripActivity.class);
intent.putExtra("trip", currentTrips.get(position));
startActivity(intent);
}
}

You are getting a null pointer exception on your list which you are using to show list items in recycler view...please check whether you are getting your data in the list or not...problem seems to be here:
CardViewAdapter cardViewAdapter = new CardViewAdapter(currentTrips);
and here:
currentTrips = getArguments().getParcelableArrayList("currentTrips");

How to enable CardView in ViewPager

I have tried using CardView in ViewPager and everytime I swipe left/right on CardView it goes to the next screen. I want the card to delete itself then. Currently as a standalone both are working fine but when I combine then only viewpager is working and not cardswipe dismiss.
I tried to disable ViewPager with the code below but this code also disables CardView swipe gestures. How can I make only CardView to have gesture and when you swipe in between 2 cards then its should have ViewPager as its not connected to card element.
Or disable ViewPager completely and use it as buttons and enable swipe on CardView. I really appreciate any help. Thanks in Advance.
FYI: I have tried android_horizontal_listview in ViewPager and that works fine and exactly like this.
For ViewPager:
mPager.setOnTouchListener(new OnTouchListener()
{
#Override
public boolean onTouch(View v, MotionEvent event)
{
return true;
}
});
For CardView:
SwipeableRecyclerViewTouchListener swipeTouchListener =
new SwipeableRecyclerViewTouchListener(mRecyclerView,
new SwipeableRecyclerViewTouchListener.SwipeListener() {
#Override
public boolean canSwipe(int position) {
return true;
}
#Override
public void onDismissedBySwipeLeft(RecyclerView recyclerView, int[] reverseSortedPositions) {
for (int position : reverseSortedPositions) {
mItems.remove(position);
mAdapter.notifyItemRemoved(position);
}
mAdapter.notifyDataSetChanged();
}
#Override
public void onDismissedBySwipeRight(RecyclerView recyclerView, int[] reverseSortedPositions) {
for (int position : reverseSortedPositions) {
mItems.remove(position);
mAdapter.notifyItemRemoved(position);
}
mAdapter.notifyDataSetChanged();
}
});
mRecyclerView.addOnItemTouchListener(swipeTouchListener);
Mainactivity.java
public class MainActivity extends Activity implements ActionBar.TabListener {
ViewPager vp;
View viewpager_layout_1;
View viewpager_layout_2;
View viewpager_layout_3;
ActionBar.Tab tab_1;
ActionBar.Tab tab_2;
ActionBar.Tab tab_3;
ActionBar bar;
/////
String jsonstring1;
CardViewAdapter spinnerArray;
ImageLoader imageLoader = ImageLoader.getInstance();//
DisplayImageOptions options;
ArrayList<HashMap<String, String>> array_list1;
RecyclerView recyclerView;
RelativeLayout re1;
private Context mContext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mContext = this;
viewpager_layout_1 = new View(mContext);
viewpager_layout_1 = getLayoutInflater().inflate(R.layout.sample1, null);
viewpager_layout_3 = new View(mContext);
viewpager_layout_3 = getLayoutInflater().inflate(R.layout.sample2, null);
viewpager_layout_2 = new View(mContext);
viewpager_layout_2 = getLayoutInflater().inflate(R.layout.sample3, null);
vp = (ViewPager) findViewById(R.id.vp);
bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayShowTitleEnabled(false);
bar.setDisplayShowHomeEnabled(false);
Vector<View> pages = new Vector<View>();
pages.add(viewpager_layout_1);
pages.add(viewpager_layout_3);
pages.add(viewpager_layout_2);
CustomPagerAdapter adapter = new CustomPagerAdapter(mContext, pages);
vp.setAdapter(adapter);
vp.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
bar.setSelectedNavigationItem(position);
}
});
tab_1 = bar.newTab();
tab_1.setCustomView(R.layout.tab_layout_1);
tab_1.setTabListener(this);
bar.addTab(tab_1);
tab_2 = bar.newTab();
tab_2.setCustomView(R.layout.tab_layout_2);
tab_2.setTabListener(this);
bar.addTab(tab_2);
tab_3 = bar.newTab();
tab_3.setCustomView(R.layout.tab_layout_3);
tab_3.setTabListener(this);
bar.addTab(tab_3);
////
imageLoader.init(ImageLoaderConfiguration.createDefault(MainActivity.this));
jsonstring1 = "[{\"category\":\"1\",\"no\":\"1\",\"image\":\"http://upload.wikimedia.org/wikipedia/commons/c/c3/Jordan_by_Lipofsky_16577.jpg\"},{\"category\":\"2\",\"no\":\"2\",\"image\":\"http://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Basketball_World_Cup_2014.jpg/800px-Basketball_World_Cup_2014.jpg\"},{\"category\":\"3\",\"no\":\"3\",\"image\":\"http://upload.wikimedia.org/wikipedia/commons/4/4e/Basketball_Goal.jpg\"},{\"category\":\"4\",\"no\":\"4\",\"image\":\"http://upload.wikimedia.org/wikipedia/commons/1/10/Basketball_through_hoop.jpg\"}]";
//////////
array_list1 = new ArrayList<HashMap<String, String>>();
JSONArray arr = null;
try {
arr = new JSONArray(jsonstring1);
for (int i = 0; i < arr.length(); i++) {
JSONObject e1 = arr.getJSONObject(i);
String category = e1.getString("category").trim();
String no = e1.getString("no").trim();
String image = e1.getString("image").trim();
HashMap<String, String> map = new HashMap<String, String>();
map.put("category", category);
map.put("no", no);
map.put("image", image);
// adding HashList to ArrayList
array_list1.add(map);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
OnItemTouchListener itemTouchListener = new OnItemTouchListener() {
#Override
public void onCardViewTap(View view, int position) {
Toast.makeText(MainActivity.this, "Tapped " + array_list1.get(position), Toast.LENGTH_SHORT).show();
}
#Override
public void onButton1Click(View view, int position) {
Toast.makeText(MainActivity.this, "Clicked Button1 in " + array_list1.get(position), Toast.LENGTH_SHORT).show();
}
#Override
public void onButton2Click(View view, int position) {
Toast.makeText(MainActivity.this, "Clicked Button2 in " + array_list1.get(position), Toast.LENGTH_SHORT).show();
}
};
spinnerArray = new CardViewAdapter(itemTouchListener, MainActivity.this, array_list1);
recyclerView = (RecyclerView) viewpager_layout_3.findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
SlideInBottomAnimationAdapter alphaAdapter = new SlideInBottomAnimationAdapter(spinnerArray);
ScaleInAnimationAdapter alphaAdapter2 = new ScaleInAnimationAdapter(alphaAdapter);
final AlphaInAnimationAdapter alphaAdapter3 = new AlphaInAnimationAdapter(alphaAdapter2);
alphaAdapter3.setDuration(500);
alphaAdapter3.setFirstOnly(true);
recyclerView.setAdapter(alphaAdapter3);
final SwipeableRecyclerViewTouchListener swipeTouchListener =
new SwipeableRecyclerViewTouchListener(recyclerView,
new SwipeableRecyclerViewTouchListener.SwipeListener() {
#Override
public boolean canSwipe(int position) {
return true;
}
#Override
public void onDismissedBySwipeLeft(RecyclerView recyclerView, int[] reverseSortedPositions) {
for (int position : reverseSortedPositions) {
// mItems.remove(position);
Toast.makeText(MainActivity.this, array_list1.get(position) + " swiped left", Toast.LENGTH_SHORT).show();
array_list1.remove(position);
alphaAdapter3.notifyItemRemoved(position);
}
alphaAdapter3.notifyDataSetChanged();
}
#Override
public void onDismissedBySwipeRight(RecyclerView recyclerView, int[] reverseSortedPositions) {
for (int position : reverseSortedPositions) {
//
Toast.makeText(MainActivity.this, array_list1.get(position) + " swiped right", Toast.LENGTH_SHORT).show();
array_list1.remove(position);
alphaAdapter3.notifyItemRemoved(position);
}
alphaAdapter3.notifyDataSetChanged();
}
});
recyclerView.addOnItemTouchListener(swipeTouchListener);
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
// Toast.makeText(getBaseContext(), tab.toString(), 5).show();
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
// Toast.makeText(getBaseContext(), tab.toString(), 5).show();
vp.setCurrentItem(tab.getPosition());
if (tab.getPosition() == 2) {
tab_2.setCustomView(null);
tab_2.setCustomView(R.layout.tab_layout_2);
tab_1.setCustomView(null);
tab_1.setCustomView(R.layout.tab_layout_1);
tab_3.setCustomView(null);
tab_3.setCustomView(R.layout.tab_layout_33);
} else if (tab.getPosition() == 1) {
tab_2.setCustomView(null);
tab_2.setCustomView(R.layout.tab_layout_22);
tab_1.setCustomView(null);
tab_1.setCustomView(R.layout.tab_layout_1);
tab_3.setCustomView(null);
tab_3.setCustomView(R.layout.tab_layout_3);
} else if (tab.getPosition() == 0) {
tab_1.setCustomView(null);
tab_1.setCustomView(R.layout.tab_layout_11);
if (tab_2 != null) {
tab_2.setCustomView(null);
tab_2.setCustomView(R.layout.tab_layout_2);
}
if (tab_3 != null) {
tab_3.setCustomView(null);
tab_3.setCustomView(R.layout.tab_layout_3);
}
}
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
// Toast.makeText(getBaseContext(), tab.toString(), 5).show();
}
public interface OnItemTouchListener {
// this will disallow the touch request for parent scroll on touch of child view
/**
* Callback invoked when the user Taps one of the RecyclerView items
*
* #param view the CardView touched
* #param position the index of the item touched in the RecyclerView
*/
public void onCardViewTap(View view, int position);
/**
* Callback invoked when the Button1 of an item is touched
*
* #param view the Button touched
* #param position the index of the item touched in the RecyclerView
*/
public void onButton1Click(View view, int position);
/**
* Callback invoked when the Button2 of an item is touched
*
* #param view the Button touched
* #param position the index of the item touched in the RecyclerView
*/
public void onButton2Click(View view, int position);
}
public class CustomPagerAdapter extends PagerAdapter {
private final Context mContext;
private final Vector<View> pages;
public CustomPagerAdapter(Context context, Vector<View> pages) {
this.mContext = context;
this.pages = pages;
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
View page = pages.get(position);
container.addView(page);
return page;
}
#Override
public int getCount() {
return pages.size();
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view.equals(object);
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
public class CardViewAdapter extends RecyclerView.Adapter<CardViewAdapter.ViewHolder> {
ArrayList<HashMap<String, String>> d;
Activity a;
private List<String> cards;
private OnItemTouchListener onItemTouchListener2;
public CardViewAdapter(OnItemTouchListener onItemTouchListener, Activity a, ArrayList<HashMap<String, String>> d) {
// this.cards = cards;
this.onItemTouchListener2 = onItemTouchListener;
this.a = a;
this.d = d;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_view_layout, viewGroup, false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
// viewHolder.title.setText(cards.get(i));
HashMap<String, String> item = d.get(i);
viewHolder.title.setText(item.get("category"));
imageLoader.displayImage(item.get("image"), viewHolder.im2);
}
#Override
public int getItemCount() {
// return d == null ? 0 : d.size();
return (null != d ? d.size() : 0);
// return d.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
MotionEvent motionEvent;
private int mSlop;
private int mMinFlingVelocity;
private int mMaxFlingVelocity;
private long mAnimationTime;
// Fixed properties
// private RecyclerView mRecyclerView;
private SwipeableRecyclerViewTouchListener.SwipeListener mSwipeListener;
// Transient properties
private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero
private int mDismissAnimationRefCount = 0;
private float mAlpha;
private float mDownX;
private float mDownY;
private boolean mSwiping;
private int mSwipingSlop;
private VelocityTracker mVelocityTracker;
private int mDownPosition;
private int mAnimatingPosition = ListView.INVALID_POSITION;
private View mDownView;
private boolean mPaused;
private float mFinalDelta;
///
private TextView title;
private Button button1;
private Button button2;
private ImageView im2;
public ViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.card_view_title);
im2 = (ImageView) itemView.findViewById(R.id.imageView);
}
}
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/relativelayout_1">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:id="#+id/linearlayout_1"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="#+id/vp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>
</LinearLayout>
</RelativeLayout>
sample2.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/re1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>

To solve this issue I used an ItemTouchHelper provided by Android to easily swipe to delete an item from a RecyclerView.
Please see implementation below:
MainActivity:
Here I have the implementation of the ViewPager and it's child Fragments.
package za.co.gadgetgirl.testcardpager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
Adapter adapter = new Adapter(getSupportFragmentManager());
Frag1 frag1 = new Frag1();
Frag2 frag2 = new Frag2();
Frag3 frag3 = new Frag3();
adapter.addFragment(frag1, "frag1");
adapter.addFragment(frag2, "frag2");
adapter.addFragment(frag3, "frag3");
viewPager.setAdapter(adapter);
}
static class Adapter extends FragmentPagerAdapter {
private final List<Fragment> mFragments = new ArrayList<>();
private final List<String> mFragmentTitles = new ArrayList<>();
public Adapter(FragmentManager fm) {
super(fm);
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitles.add(title);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
}
}
Frag1:
On this Fragment I have a RecyclerView that has an ItemTouchHelper attached. The ItemTouchHelper listens for the onSwiped(...) method that is defined in the SimpleCallback interface and I just remove the swiped item in this method.
package za.co.gadgetgirl.testcardpager;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Frag1 extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.frag1, container, false);
final RecyclerView rv = (RecyclerView) v.findViewById(R.id.rv);
final LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
final RVAdapter rvAdapter = new RVAdapter(Person.initializeData());
rv.setAdapter(rvAdapter);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT) {
#Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
rvAdapter.removeItem(viewHolder.getAdapterPosition());
}
});
itemTouchHelper.attachToRecyclerView(rv);
return v;
}
}
RVAdapter:
public class RVAdapter extends RecyclerView.Adapter<RVAdapter.PersonViewHolder> {
//...implementation...
public void removeItem(int position) {
persons.remove(position);
notifyItemRemoved(position);
}
}
To use the ItemTouchHelper, you will need the appcompat-v7:22.2.0 dependency and above defined in your app gradle file.

I haven't use SwipeableRecyclerView before so I cannot really say much. I have a problem same as you before. I solve it by handling onTouch event of the base container of fragment (such as LinearLayout,RelativeLayout) and it work for me. Why don't you try this solution and get back to us

For the use case that you are describing, I don't think that ViewPager is the class that you want to use to get your swipe action. It seems to me that the combination of CoordinatorLayout and SwipeDismissBehavior is more appropriate.
EDIT:
See my solution below:
Layout XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView
android:id="#+id/cardView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.CardView>
</android.support.design.widget.CoordinatorLayout>
Activity:
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CardView cardView = (CardView) findViewById(R.id.cardView);
SwipeDismissBehavior<CardView> behavior = new SwipeDismissBehavior();
behavior.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_START_TO_END);
behavior.setListener(new SwipeDismissBehavior.OnDismissListener() {
#Override
public void onDismiss(View view) {
finish(); // close activity if desired
}
#Override
public void onDragStateChanged(int state) {
}
});
((CoordinatorLayout.LayoutParams) cardView.getLayoutParams()).setBehavior(behavior);
}
}
Also, here are some examples of using the CoordinatorLayout:
How to use SwipeDismissBehavior.OnDismissListener on RecyclerView
CoordinatorLayout using the ViewPager's RecyclerView
https://lab.getbase.com/introduction-to-coordinator-layout-on-android/
http://android-developers.blogspot.co.uk/2015/05/android-design-support-library.html
I haven't been able to find many examples using SwipeDismissBehavior specifically, but the concepts are similar to the links above.
Alternatively, you may also be able to follow the suggestions of a similar post:
Android swipe layout to dismiss to get the results you desire.
Hope this helps.