Develop Reference

Add and show items to the RecyclerView in different fragments

I am creating an app that has 3 Tabs and every tabs has a different jobs. For Example, In Employee tab, there are EditText for taking name and surname of an emolyee and Button for add items to the its RecyclerView. City Tab is same as Employee tab just takes city names. The last tab has only one Button for distribute entries of Employees and Cities and show to user.
My problem is, I cannot find how to add items to the RecyclerView and and show it to the user.
Here is my code. I am sending just Tab1's fragment and layouts. Others are the same.
This is the Fragment1 class:
public class Fragment1 extends Fragment {
private RecyclerView employeeRecyclerView;
private RecyclerViewAdapter employeeRecyclerViewAdapter;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.name_employee, container, false);
}
}
This is the RecyclerViewAdapter class:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
private List<String> mData;
private LayoutInflater mInflater;
RecyclerViewAdapter(Context context, List<String> data) {
this.mInflater = LayoutInflater.from(context);
this.mData = data;
}
#NonNull
#Override
public RecyclerViewAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = mInflater.inflate(R.layout.fragment_main, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerViewAdapter.ViewHolder holder, int position) {
String x = mData.get(position);
holder.myTextView.setText(x);
}
#Override
public int getItemCount() {
return mData.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView myTextView;
ViewHolder(View itemView) {
super(itemView);
myTextView = itemView.findViewById(R.id.section_label);
}
}
}
and Employee.xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/employeeField"
android:hint="Name and Surname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
<Button
android:id="#+id/cityAdd"
android:text="addEmployee"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/employees"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
and fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.main.PlaceholderFragment">
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Update I upload other classes. There are Fragment2 and Fragment3 classes but they are same with Fragment1.
PlaceHolderFragment.class
public class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
private PageViewModel pageViewModel;
public static PlaceholderFragment newInstance(int index) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle bundle = new Bundle();
bundle.putInt(ARG_SECTION_NUMBER, index);
fragment.setArguments(bundle);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
pageViewModel = ViewModelProviders.of(this).get(PageViewModel.class);
int index = 1;
if (getArguments() != null) {
index = getArguments().getInt(ARG_SECTION_NUMBER);
}
pageViewModel.setIndex(index);
}
#Override
public View onCreateView(
#NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_main, container, false);
final TextView textView = root.findViewById(R.id.section_label);
pageViewModel.getText().observe(this, new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText(s);
}
});
return root;
}
}
SectionsPagerAdapter.class
public class SectionsPagerAdapter extends FragmentPagerAdapter {
#StringRes
private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3};
private final Context mContext;
public SectionsPagerAdapter(Context context, FragmentManager fm) {
super(fm);
mContext = context;
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position){
case 0:
fragment = new Fragment1();
break;
case 1:
fragment = new Fragment2();
break;
case 2:
fragment = new Fragment3();
break;
}
return fragment;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return mContext.getResources().getString(TAB_TITLES[position]);
}
#Override
public int getCount() {
return 3;
}
}
and PageViewModel.class
public class PageViewModel extends ViewModel {
private MutableLiveData<Integer> mIndex = new MutableLiveData<>();
private LiveData<String> mText = Transformations.map(mIndex, new Function<Integer, String>() {
#Override
public String apply(Integer input) {
return "Hello world from section: " + input;
}
});
public void setIndex(int index) {
mIndex.setValue(index);
}
public LiveData<String> getText() {
return mText;
}
}

Android ViewPager doesn't show Fragment

I'm trying to let my ViewPager to show my Fragments, however, it doesn't seem to do the work. All it does is just not showing anything, not even a height. Can someone tell me what step am I missing? thanks
main_activity.xml:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorBackground">
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottomNavigation" />
<com.aurelhubert.ahbottomnavigation.AHBottomNavigation
android:id="#+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom" />
</android.support.design.widget.CoordinatorLayout>
MainActivity.java:
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
AHBottomNavigation bottomNavigation;
ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bottomNavigation = (AHBottomNavigation) findViewById(R.id.bottomNavigation);
viewPager = (ViewPager) findViewById(R.id.viewpager);
ViewPagerAdapter pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
// Buttom Navigation
// Add items
AHBottomNavigationItem item1 = new AHBottomNavigationItem("Rooms", R.drawable.ic_chatboxes);
AHBottomNavigationItem item2 = new AHBottomNavigationItem("User", R.drawable.ic_contact_outline);
bottomNavigation.addItem(item1);
bottomNavigation.addItem(item2);
// Customize Buttom Navigation
bottomNavigation.setTitleState(AHBottomNavigation.TitleState.ALWAYS_SHOW);
// Set colors
bottomNavigation.setAccentColor(ContextCompat.getColor(this, R.color.colorAccent));
bottomNavigation.setInactiveColor(ContextCompat.getColor(this, R.color.colorTabDefault));
// Set background color
bottomNavigation.setDefaultBackgroundColor(ContextCompat.getColor(this, R.color.colorBackground));
bottomNavigation.setTranslucentNavigationEnabled(true);
// Viewpager setup
pagerAdapter.addFragment(new Rooms(), "Rooms");
pagerAdapter.addFragment(new User(), "User");
viewPager.setAdapter(pagerAdapter);
viewPager.setCurrentItem(bottomNavigation.getCurrentItem());
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
bottomNavigation.setCurrentItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
bottomNavigation.setOnTabSelectedListener(new AHBottomNavigation.OnTabSelectedListener() {
#Override
public boolean onTabSelected(int position, boolean wasSelected) {
viewPager.setCurrentItem(position, true);
return true;
}
});
}
ViewPagerAdapter.java:
public class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
private Fragment currentItem;
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
#Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
if (getCurrentItem() != object) {
currentItem = ((Fragment) object);
}
super.setPrimaryItem(container, position, object);
}
public Fragment getCurrentItem() {
return currentItem;
}
}

Multiple instance of same fragments inside a ViewPager

I have got some weird problem after implementing multiple instance(loaded dynamically depending on the data) of same fragment inside a Viewpager.
My fragment class consists of a listview which will be populated according to the data retrieved from the server, but every time i swipe page from one to another, the data inside a listview of the fragment is jumbled.
Here is the code. Any help will be appreciated. Thank You.
This the Fragment class where the Viewpager is present.
public class Menu extends Fragment implements View.OnClickListener {
private SlidingTabLayout mSlidingTab;
SlidingUpPanelLayout mLayout;
private ArrayList<String> menu_names;
private ViewPager pager;
ActionBarActivity act;
public ArrayList<ArrayList<All_Data>> menus;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.main, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
mSlidingTab = (SlidingTabLayout) act.findViewById(R.id.sliding_tab);
mSlidingTab.setDistributeEvenly(true);
mSlidingTab.setCustomTabView(R.layout.custom_text, 0);
pager= (ViewPager) act.findViewById(R.id.pager);
mSlidingTab.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return android.R.color.transparent;
}
});
mSlidingTab.bringToFront();
menuUpdate();
}
class MyPagerAdapter extends FragmentStatePagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return Meals.newInstance(position);
}
#Override
public int getCount() {
return menu_names.size();
}
#Override
public CharSequence getPageTitle(int i) {
return menu_names.get(i);
}
}
private void menuUpdate(String result) {
//menu_names= List Retrieved from server
//menus= List Retrieved from server
pager.setAdapter(new MyPagerAdapter(act.getSupportFragmentManager()));
mSlidingTab.setViewPager(pager);
}
Meals.java(Fragment class):
public class Meals extends Fragment {
ActionBarActivity activity;
int position = 0;
static Meals newInstance(int page) {
Meals fragmentFirst = new Meals();
Bundle args = new Bundle();
args.putInt("position", page);
fragmentFirst.setArguments(args);
return fragmentFirst;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.meals, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
position = getArguments().getInt("position");
ArrayList<All_Data> mMeals;
Fragment menu = activity.getSupportFragmentManager().findFragmentByTag("Menu");
mMeals = ((Menu) menu).menus.valueAt(position);
ListView mList = (ListView) activity.findViewById(R.id.mainMenu1);
LayoutInflater inflater;
inflater = LayoutInflater.from(activity.getApplicationContext());
mList.addHeaderView(inflater.inflate(R.layout.custom_text, mList, false));
mList.addFooterView(inflater.inflate(R.layout.footer, mList, false));
Menu_adapter adapter = new Menu_adapter(((Menu) menu), mMeals, activity);
mList.setAdapter(adapter);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
activity = (ActionBarActivity) context;
}
#Override
public void onResume() {
super.onResume();
MyApplication.getInstance().trackScreenView("Startes Screen");
}
}
meals.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f1f2f3"
android:orientation="vertical">
<ListView
android:id="#+id/mainMenu1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#f1f2f3"
android:dividerHeight="20dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:scrollbars="none" />
</RelativeLayout>

Sliding Tabs with RecycleView Fragments and Swipe to Refresh

i'm having some issues implementing a Sliding Tabs activity that contains 2 Fragments and a Swipe Down to Refresh layout, namely implementing the Swipe Down to Refresh part (the rest is working just fine).
First here are my XML files.
The Main Activity XML , which contains the ViewPager wrapped in an SwipeRefreshLayout :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.popal.soul.MovieListActivityTEST">
<com.example.popal.soul.SlidingTabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="2dp"
android:background="#color/ColorPrimary"/>
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/swipeContainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_weight="1">
</android.support.v4.view.ViewPager>
</android.support.v4.widget.SwipeRefreshLayout>
And the first tab XML , one of the 2 tabs (both are similar, so i`ll only post one)
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.widget.RecyclerView
android:id="#+id/cardList"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ProgressBar
android:id="#+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
Now, my main activity, which handles the ViewPager, Adapter an the SlidingTabsLayout.
public class MovieListActivityTEST extends AppCompatActivity {
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[]={"Home","Events"};
int Numboftabs =2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_list_activity_test);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
}
And finally, my fragment for the first Tab
public class Tab1 extends Fragment {
public MovieListAdapter movieListAdaptor;
public RecyclerView recycleList;
private SwipeRefreshLayout swipeContainer;
private List<MovieListAdapter.MovieDetails> movieList = new ArrayList<MovieListAdapter.MovieDetails>();
private ProgressBar progressBar;
private final static String MOVIES_POST_REQUEST ="//Long String, Edited out since it`s not relevant"
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1, container, false);
recycleList = (RecyclerView) v.findViewById(R.id.cardList);
progressBar = (ProgressBar) v.findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
swipeContainer = (SwipeRefreshLayout) v.findViewById(R.id.swipeContainer);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recycleList.setLayoutManager(llm);
swipeContainer.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
movieListAdaptor.clear();
new Send_data_to_server().execute(MOVIES_POST_REQUEST);
swipeContainer.setRefreshing(false);
}
});
new Send_data_to_server().execute(MOVIES_POST_REQUEST);
return v;
}
The issue is, i'm getting a NULL Pointer Exception at swipeContainer.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {...} method, which i guess is because the Swipe-to-Refresh layout is in the main activity XML, and not the tabs fragment. So what is the proper way to implement this ? I also tried implementing a Swipe to refresh layout in one of the Tabs XML instead of wrapping the ViewPager in it, like above, but it would crash when swiping from tab to another.
Here`s the code from the entire fragment in Tab1, for tobs answer below
public class MoviesTabFragment extends Fragment implements Refreshable {
public MovieListAdapter movieListAdaptor;
public RecyclerView recycleList;
//private SwipeRefreshLayout swipeContainer;
public List<MovieListAdapter.MovieDetails> movieList = new ArrayList<MovieListAdapter.MovieDetails>();
public ProgressBar progressBar;
public final static String MOVIES_POST_REQUEST ="";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1, container, false);
recycleList = (RecyclerView) v.findViewById(R.id.cardList);
progressBar = (ProgressBar) v.findViewById(R.id.progress_bar);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recycleList.setLayoutManager(llm);
new Send_data_to_server().execute(MOVIES_POST_REQUEST);
return v;
}
#Override
public void refresh() {
new Send_data_to_server().execute(MOVIES_POST_REQUEST);
}
public class Send_data_to_server extends AsyncTask<String, Void, String> {
private String data_poster;
private String data_fanart;
// protected void onPreExecute() {
// progressBar.setVisibility(View.VISIBLE);
// }
protected String doInBackground(String... params)
{
String jason_data = params[0];
HttpClient http_con = new HttpClient();
String output_from_server = http_con.establish_con(jason_data);
Log.i("DataFromServer", output_from_server);
JSONObject json_Obj = null;
JSONObject child_obj = null; //creating the "result" object in the main JSON Object
try {
json_Obj = new JSONObject(output_from_server);
child_obj = create_subObject("result", json_Obj);
JSONArray jsonArray = child_obj.optJSONArray("movies");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String title_data = jsonObject.optString("label").toString();
String plot_data = jsonObject.optString("plot").toString();
String year_data = jsonObject.optString("year").toString();
String movie_id_data = jsonObject.optString("movieid").toString();
String imdb_score = jsonObject.optString("rating").toString();
String imdb_score_short = imdb_score.substring(0, 3);
JSONObject child_obj2 = create_subObject("art", jsonObject);
data_poster = child_obj2.optString("poster").toString();
data_fanart = child_obj2.optString("fanart").toString();
JSONEncodePosterFanart encodePosterFanart = new JSONEncodePosterFanart();
String jason_dataPoster = encodePosterFanart.GetPosterFanartEncodedURL(data_poster);
String jason_dataFanart = encodePosterFanart.GetPosterFanartEncodedURL(data_fanart);
HttpClient http = new HttpClient();
String output_from_serverPoster = http.establish_con(jason_dataPoster);
HttpClient http2 = new HttpClient();
String output_from_serverFanart = http2.establish_con(jason_dataFanart);
JSONPosterFanart poster_fanart = new JSONPosterFanart();
String post_dl = poster_fanart.GetPosterFanart(output_from_serverPoster);
JSONPosterFanart poster_fanart2 = new JSONPosterFanart();
String fanart_dl = poster_fanart2.GetPosterFanart(output_from_serverFanart);
if (null == movieList) {
movieList = new ArrayList<MovieListAdapter.MovieDetails>();
}
MovieListAdapter.MovieDetails item = new MovieListAdapter.MovieDetails(title_data+" ("+year_data+")", post_dl, fanart_dl,plot_data,movie_id_data,imdb_score_short);
movieList.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
return output_from_server;
}
protected void onPostExecute(String output_from_server) {
super.onPostExecute(output_from_server);
//progressBar.setVisibility(View.INVISIBLE);
movieListAdaptor = new MovieListAdapter(getActivity(), movieList);
recycleList.setAdapter(movieListAdaptor);
}
private JSONObject create_subObject(String tagName, JSONObject jObj) throws JSONException {
JSONObject subObj = jObj.getJSONObject(tagName); //getJSONObject returns the value from tagName (in our case jason_Obj that is being passed ar a param)
return subObj;
}
}
}
And the RecycleView adapter:
public class MovieListAdapter extends RecyclerView.Adapter<MovieListAdapter.MovieViewHolder> {
public List<MovieDetails> movieList;
private Context mContext;
public MovieListAdapter(Context mContext, List<MovieDetails> movieList) {
this.mContext = mContext;
this.movieList = movieList;
}
#Override
public int getItemCount() {
return movieList.size();
}
public void clear() {
movieList.clear();
notifyDataSetChanged();
}
#Override
public MovieViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.card_layout_movies_list, viewGroup, false);
return new MovieViewHolder(itemView);
}
#Override
public void onBindViewHolder(MovieViewHolder movieViewHolder, int i) {
MovieDetails mdet = movieList.get(i);
String fanart = "http://192.168.1.128/"+mdet.getImageViewFanart();
String poster = "http://192.168.1.128/"+mdet.getImageViewPoster();
Log.i("fanart", fanart);
Log.i("poster", poster);
movieViewHolder.vTitle.setText(mdet.Title);
Picasso.with(mContext).load(poster)
.resize(500, 746)
.error(R.drawable.poster_placeholder)
.placeholder(R.drawable.poster_placeholder)
.into(movieViewHolder.vPoster);
Picasso.with(mContext).load(fanart)
.resize(960, 540)
.error(R.drawable.fanart_placeholder)
.placeholder(R.drawable.fanart_placeholder)
.into(movieViewHolder.vFanart);
movieViewHolder.vplot = mdet.getPlot();
movieViewHolder.vmovie_id = mdet.getMovie_id();
}
public class MovieViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
protected TextView vTitle;
protected ImageView vPoster;
protected ImageView vFanart;
protected String vplot;
protected String vmovie_id;
protected String vimdb_score;
public MovieViewHolder(View v)
{
super(v);
vplot = new String();
vmovie_id = new String();
vimdb_score = new String();
vTitle = (TextView) v.findViewById(R.id.title);
vPoster = (ImageView) v.findViewById(R.id.imageViewPoster);
vFanart = (ImageView) v.findViewById(R.id.imageViewFanart);
v.setOnClickListener(this);
}
#Override
public void onClick(View v) {
int position = getLayoutPosition();
MovieDetails mov = movieList.get(position);
Intent intent = new Intent(mContext, MovieDetailsPageActivity.class);
Bundle bundle = new Bundle();
bundle.putString("movieid", mov.getMovie_id());
bundle.putString("plot", vplot);
bundle.putString("fanart_path", mov.getImageViewFanart());
bundle.putString("imdb_score", mov.getImdb_score());
intent.putExtras(bundle);
mContext.startActivity(intent);
}
}
public static class MovieDetails {
protected String Title;
protected String imageViewPoster;
protected String imageViewFanart;
protected String plot;
protected String movie_id;
protected String imdb_score;
public MovieDetails(String Title, String imageViewPoster,String imageViewFanart, String plot, String movie_id ,String imdb_score)
{
this.Title = Title;
this.imageViewPoster = imageViewPoster;
this.imageViewFanart = imageViewFanart;
this.plot = plot;
this.movie_id = movie_id;
this.imdb_score = imdb_score;
}
public String getTitle() {return Title;}
public String getImageViewPoster() {
return imageViewPoster;
}
public String getImageViewFanart() {
return imageViewFanart;
}
public String getPlot() {return plot;}
public String getMovie_id() {return movie_id;}
public String getImdb_score() {return imdb_score;}
}
}
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[];
int NumbOfTabs;
public ViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
super(fm);
this.Titles = mTitles;
this.NumbOfTabs = mNumbOfTabsumb;
}
#Override
public Fragment getItem(int position) {
if(position == 0)
{
MoviesTabFragment moviesTabFragment = new MoviesTabFragment();
return moviesTabFragment;
}
else
{
TVShowsTabFragment TVShowsTabFragment = new TVShowsTabFragment();
return TVShowsTabFragment;
}
}
#Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
#Override
public int getCount() {
return NumbOfTabs;
}

You're getting the NullPointerException because you inflate your fragment layout from R.layout.tab_1 which does not contain a SwipeRefreshLayout.
If you want the layout to be the parent of your ViewPager, I would recommend you to move your code which manages the RefreshLayout to the MainActivity:
public class MovieListActivityTEST extends AppCompatActivity {
ViewPager pager;
ViewPagerAdapter adapter;
SwipeRefreshLayout refreshLayout;
SlidingTabLayout tabs;
CharSequence Titles[]={"Home","Events"};
int Numboftabs =2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_list_activity_test);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
// Assign your refresh layout
refreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeContainer);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
Refreshable r = (Refreshable) adapter.getItemAt(pager.getCurrentItem());
r.refresh();
}
});
}
where each of your tab fragments implements a Refreshable interface:
public interface Refreshable {
void refresh();
}
and your adapter keeps track on all fragments:
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
// list that keeps references to all attached Fragments
private SparseArray<Fragment> pages = new SparseArray<>();
...
public Fragment getItem(int position) {
Fragment f;
if(position == 0) {
...
} else { ... }
// add fragment to the list
pages.put(position, f);
}
public void destroyItem(ViewGroup container, int position, Object object) {
// remove fragment from list if it existed
if(pages.indexOfKey(position) >= 0) {
pages.remove(position);
}
super.destroyItem(container, position, object);
}
// return the attached Fragment that is associated with the given position
public Fragment getItemAt(int position) {
return pages.get(position);
}
}

Android: calling getview() for ListView's Adapter from Fragment in viewPager

I have ViewPager that containing 3 different Fragment. each Fragment containing A Different View and also ListView, I got a problem when I was trying to show the ListView in one of Fragment from ViewPager, it doesn't show anything. I've tried to debug my adapter and it seems my getView() method is not called. I try to call my Fragment not from ViewPager, the result is getView() is called from adapter and ListView is showing. Is there any problem to show ListView from ViewPager? I have tried this solution by calling my adapter from onViewCreated() but there's nothing change. so is there any wrong with my method? this is my code :
My Fragment Class for Managing ViewPager
public class Frag_Provider extends Fragment {
private String[] tabsTitles = {"TERDEKAT", "SEMUA", "PROVIDERKU"};
String url = "";
List<ModelProvider> list_provider;
DB_Esehat db_esehat = null;
SQLiteDatabase db = null;
ContentLoadingProgressBar progressbar;
TabLayout tabLayout;
ViewPager pager;
public Frag_Provider (){
}
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
((MainActivity) getActivity()).custom_toolbar("Provider", R.color.toolbar_provider, R.color.toolbar_provider_dark);
View result=inflater.inflate(R.layout.fragment_provider, container, false);
list_provider = new ArrayList<ModelProvider>();
progressbar = (ContentLoadingProgressBar)result.findViewById(R.id.progressbar);
db_esehat = new DB_Esehat(getActivity());
db = db_esehat.getWritableDatabase();
db.delete("LST_PROVIDER", null, null);
pager=(ViewPager)result.findViewById(R.id.pager);
tabLayout = (TabLayout)result.findViewById(R.id.sliding_tabs);
url = getResources().getString(R.string.url_host)+getResources().getString(R.string.url_provider);
new ProviderTask(url).execute();
pager.setAdapter(buildAdapter(tabsTitles));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(pager);
}
});
return(result);
}
public class ProviderTask extends AsyncTask<String, Void, String> {
String url = "";
public ProviderTask(String url) {
this.url = url;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
progressbar.setVisibility(View.VISIBLE);
}
#Override
protected String doInBackground(String... params) {
String result = "";
try {
result = Connection.get(url);
} catch (Exception e) {
result = "";
}
return result;
}
#Override
protected void onPostExecute(String result) {
progressbar.setVisibility(View.GONE);
pager.setVisibility(View.VISIBLE);
tabLayout.setVisibility(View.VISIBLE);
super.onPostExecute(result);
if (result.equals("") || result.equals(null)) {
MethodSupport.AlertDialog(getActivity());
} else {
try {
JSONArray Data = new JSONArray(result);
for (int i = 0; i < Data.length(); i++) {
String LSKA_NOTE = "";
String RSALAMAT = "";
String RSTELEPON = "";
String RSNAMA = "";
String MAPPOS = "";
int RSTYPE = 0;
int RSID = 0;
int RS_NTT = 0;
JSONObject json = Data.getJSONObject(i);
if (json.has("LSKA_NOTE")) {
LSKA_NOTE = json.getString("LSKA_NOTE");
}
if (json.has("RSALAMAT")) {
RSALAMAT = json.getString("RSALAMAT");
}
if (json.has("RSTELEPON")) {
RSTELEPON = json.getString("RSTELEPON");
}
if (json.has("RSNAMA")) {
RSNAMA = json.getString("RSNAMA");
}
if (json.has("MAPPOS")) {
MAPPOS = json.getString("MAPPOS");
}
if (json.has("RSTYPE")) {
RSTYPE = json.getInt("RSTYPE");
}
if (json.has("RSID")) {
RSID = json.getInt("RSID");
}
if (json.has("RS_NTT")) {
RS_NTT = json.getInt("RS_NTT");
}
db_esehat.InsertRS(LSKA_NOTE, RSALAMAT, RSTELEPON, RSNAMA, MAPPOS, RSTYPE, RSID, RS_NTT);
}
} catch (Exception e) {
Log.d("TES", e.getMessage());
}
}
}
}
private PagerAdapter buildAdapter(String[] tabsTitles) {
return(new FragmentStatePagerAdapter(getActivity(), getChildFragmentManager(),tabsTitles));
}
}
This is FragmentStatePagerAdapter.java
public class FragmentStatePagerAdapter extends FragmentPagerAdapter {
Context ctxt=null;
private String[] tabsTitles;
public FragmentStatePagerAdapter(Context ctxt, FragmentManager mgr, String[] tabsTitles) {
super(mgr);
this.ctxt=ctxt;
this.tabsTitles = tabsTitles;
}
#Override
public int getCount() {
return tabsTitles.length;
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0:
return Frag_Provider_Terdekat.newInstance(position);
case 1:
return Frag_Provider_Semua.newInstance(position);
case 2:
return Frag_Provider_Ku.newInstance(position);
}
return null;
}
// #Override public float getPageWidth(int position) { return(0.7f); }
#Override
public String getPageTitle(int position) {
return tabsTitles[position];
}
}
this is my Fragment_Provider.xml, Layout for managing my ViewPager
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.widget.ContentLoadingProgressBar
android:id="#+id/progressbar"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:visibility="gone"
android:indeterminate="false" />
<android.support.design.widget.TabLayout
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
style="#style/MyCustomTabLayout"
app:tabMode="fixed"
android:fillViewport="true"
android:visibility="gone" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="#android:color/white"
android:layout_below="#id/sliding_tabs"
android:visibility="gone"/>
</RelativeLayout>
This is of my Fragment in ViewPagerthat containing ListView :
public class Frag_Provider_Terdekat extends Fragment {
private static final String KEY_POSITION="position";
private ListView list_provider;
List<ModelProviderTerdekat> list_ekamedicare;
DB_Esehat db_esehat;
SQLiteDatabase db;
ProviderTerdekatAdapter adapter;
static Frag_Provider_Terdekat newInstance(int position) {
Frag_Provider_Terdekat frag=new Frag_Provider_Terdekat();
Bundle args=new Bundle();
args.putInt(KEY_POSITION, position);
frag.setArguments(args);
return(frag);
}
static String getTitle(Context ctxt, int position) {
return("PROVIDER KU");
}
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View result=inflater.inflate(R.layout.fragment_child_providerterdekat, container, false);
list_provider = (ListView)result.findViewById(R.id.list_provider);
list_ekamedicare = new ArrayList<ModelProviderTerdekat>();
db_esehat = new DB_Esehat(getActivity());
list_ekamedicare = db_esehat.getProvider();
adapter = new ProviderTerdekatAdapter(getActivity().getApplicationContext(), R.layout.adapter_provider, list_ekamedicare);
list_provider.setAdapter(adapter);
return result;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
}
and this is Adapter for my ListView
public class ProviderTerdekatAdapter extends ArrayAdapter<ModelProviderTerdekat> {
List<ModelProviderTerdekat> data = Collections.emptyList();
private LayoutInflater inflater;
private Context context;
static class ViewHolder {
ImageView imvprov_map;
ImageView imvprov_fav;
TextView textprov_nama_rs;
TextView textprov_alamat_rs;
TextView textprov_km_rs;
}
public ProviderTerdekatAdapter (Context context, int viewResourceId, List<ModelProviderTerdekat> data) {
super(context, R.layout.adapter_provider, data);
this.context = context;
inflater = LayoutInflater.from(context);
this.data = data;
}
#Override
public int getCount() {
return data.size();
}
#Override
public long getItemId(int arg0) {
return 0;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
if (view == null) {
view = inflater.inflate(R.layout.adapter_provider, parent, false);
ViewHolder viewHolder = new ViewHolder();
viewHolder.imvprov_map = (ImageView) view.findViewById(R.id.imvprov_map);
viewHolder.imvprov_fav = (ImageView) view.findViewById(R.id.imvprov_fav);
viewHolder.textprov_nama_rs = (TextView) view.findViewById(R.id.textprov_nama_rs);
viewHolder.textprov_alamat_rs = (TextView) view.findViewById(R.id.textprov_alamat_rs);
viewHolder.textprov_km_rs = (TextView) view.findViewById(R.id.textprov_km_rs);
view.setTag(viewHolder);
}
ViewHolder viewHolder = (ViewHolder) view.getTag();
viewHolder.textprov_nama_rs.setText(data.get(position).getRSNAMA());
viewHolder.textprov_alamat_rs.setText(data.get(position).getRSALAMAT());
return view;
}
}
I have no Idea why my GetView() not called in my Adapter, is it because I put in ViewPager? well I hope someone understand about it and help me to solver my problem. thank you very much.

Finally.. I found a solution for my problem, it's because I put ViewPager in RelativeLayout after I change into LinearLayout all view displayed as I wanted
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.widget.ContentLoadingProgressBar
android:id="#+id/progressbar"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:visibility="gone"
android:indeterminate="false" />
<android.support.design.widget.TabLayout
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
style="#style/MyCustomTabLayout"
app:tabMode="fixed"
android:fillViewport="true"
android:visibility="gone" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="#android:color/white"
android:layout_below="#id/sliding_tabs"
android:visibility="gone"/>
</LinearLayout>