Develop Reference

RecyclerView not restored on orientation change

I am trying to make my app handle orientation changes. Right now I am working with a RecyclerView that has an CustomAdapter to handle the data. I have implemented onSaveInstanceState to save the data that is in the Adapter, but when I re-insert it after orientation change, the method onBindViewHolder is not called. I have confirmed the data is saved and the array lists are not empty and contain the data I need.
Here is the CustomAdapter:
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private static final String TAG = "CustomAdapter";
private ArrayList<Words> mDataSet;
private RecyclerView mRecyclerView;
private PopupWindow mPopupWindow;
private int currentPos;
private String srcOld;
private String targetOld;
private TranslateActivityFragment mFragment;
private EditText mEditSrc;
private EditText mEditTarget;
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView textView;
private TextView textView2;
private TextView textView3;
public ViewHolder(View v){
super(v);
textView = v.findViewById(R.id.adapter_textview1);
textView2 = v.findViewById(R.id.adapter_textview2);
textView3 = v.findViewById(R.id.adapter_textview3);
v.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
mPopupWindow.showAtLocation(mRecyclerView, Gravity.CENTER,0,0);
mPopupWindow.setFocusable(true);
mPopupWindow.update();
currentPos = getAdapterPosition();
setCurrText();
}
private void setCurrText(){
Words tmp = mDataSet.get(currentPos);
srcOld = tmp.getW1();
targetOld = tmp.getW2();
mEditSrc.setText(srcOld);
mEditTarget.setText(targetOld);
}
});
}
public TextView getLeftTextView(){
return textView;
}
public TextView getCenterTextView(){return textView2;}
public TextView getRightTextView(){return textView3;}
}
public CustomAdapter(RecyclerView recyclerView, Context context, TranslateActivityFragment fragment){
mRecyclerView = recyclerView;
mDataSet = new ArrayList<Words>();
mFragment = fragment;
this.notifyDataSetChanged();
View v = LayoutInflater.from(mFragment.getActivity()).inflate(R.layout.edit_translate,null,false);
createPopupWindow(v, mFragment.getActivity());
setEditText(v);
}
private void setEditText(View v){
mEditSrc = v.findViewById(R.id.edit_src);
mEditTarget = v.findViewById(R.id.edit_target);
}
private void createPopupWindow(View v, Activity activity){
DisplayMetrics metrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
float width = 300*metrics.density;
float height = 200*metrics.density;
mPopupWindow = new PopupWindow(v,(int)width, (int)height);
Button buttonOk = v.findViewById(R.id.button_ok);
Button buttonCancel = v.findViewById(R.id.button_cancel);
Button buttonDelete = v.findViewById(R.id.button_delete);
buttonCancel.setOnClickListener(new CancelListener());
buttonOk.setOnClickListener(new OkListener());
buttonDelete.setOnClickListener(new DeleteListener());
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType){
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.textview_layout, viewGroup,false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, final int position){
Log.d(TAG, "Element " + position + " set." + mDataSet.get(position).getW1());
viewHolder.getLeftTextView().setText(mDataSet.get(position).getW1());
viewHolder.getCenterTextView().setText(" - ");
viewHolder.getRightTextView().setText( mDataSet.get(position).getW2());
}
#Override
public int getItemCount() {
return mDataSet.size();
}
public void addData(Words newData, RecyclerView recyclerView){
mDataSet.add(newData);
System.out.println("------ ADDING DATA--------");
this.notifyDataSetChanged();
if (mDataSet.size() > 0) {
recyclerView.smoothScrollToPosition(mDataSet.size() - 1);
}
}
public void dismissPopup(){
mPopupWindow.dismiss();
}
public void removeWord(){
mDataSet.remove(currentPos);
System.out.println("mDataSet.size(): " + mDataSet.size());
System.out.println("mFragment.getTranslater.getData.size(): " + mFragment.getTranslater().getWords().size());
mFragment.getTranslater().deleteWord(currentPos);
this.notifyDataSetChanged();
}
// Update the current word from EditTexts
public void updateWord(){
String src = mEditSrc.getText().toString();
String target = mEditTarget.getText().toString();
mDataSet.get(currentPos).setW1(src);
mDataSet.get(currentPos).setW2(target);
mFragment.getTranslater().updateWord(src, target, currentPos);
this.notifyDataSetChanged();
}
private class OkListener implements View.OnClickListener {
#Override
public void onClick(View view) {
updateWord();
dismissPopup();
}
}
private class CancelListener implements View.OnClickListener{
#Override
public void onClick(View view){
dismissPopup();
}
}
private class DeleteListener implements View.OnClickListener{
#Override
public void onClick(View view){
removeWord();
dismissPopup();
}
}
public ArrayList<Words> getWords(){
return mDataSet;
}
public ArrayList<String> getW1List() {
ArrayList<String> tmp = new ArrayList<>();
for (Words w : mDataSet){
tmp.add(w.getW1());
}
return tmp;
}
public ArrayList<String> getW2List(){
ArrayList<String> tmp = new ArrayList<>();
for (Words w : mDataSet){
tmp.add(w.getW2());
}
return tmp;
}
//
// Here is where I try to restore data.
//
public void restoreWords(ArrayList<String> w1, ArrayList<String> w2, RecyclerView recyclerView){
if (mDataSet == null){
mDataSet = new ArrayList<>();
}
System.out.println("Restoring words");
for (int i = 0; i < w1.size(); ++i){
Words tmp = new Words(w1.get(i), w2.get(i), 0,0,0,false);
addData(tmp, recyclerView);
}
}
}
Code in Fragment to handle the view:
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mAdapter = new CustomAdapter(mRecyclerView, this.getContext(), this);
mRecyclerView.setAdapter(mAdapter);
if (savedInstanceState != null){
ArrayList<String> w1 = savedInstanceState.getStringArrayList(TranslateActivity.W1LIST);
ArrayList<String> w2 = savedInstanceState.getStringArrayList(W2LIST);
restoreWords(w1,w2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_translate, container, false);
mRecyclerView = root.findViewById(R.id.translate_recycle);
mLayoutManager = new LinearLayoutManager(getActivity(), LinearLayout.VERTICAL, false);
mRecyclerView.setLayoutManager(mLayoutManager);
return root;
}
#Override
public void onViewCreated(View v, Bundle savedInstanceState){
mHelper = new Helper();
if (savedInstanceState == null) {
Intent intent = getActivity().getIntent();
source_lang = intent.getStringExtra(MainActivityFragment.SOURCE_LANG);
target_lang = intent.getStringExtra(MainActivityFragment.TARGET_LANG);
} else {
source_lang = savedInstanceState.getString(MainActivityFragment.SOURCE_LANG);
target_lang = savedInstanceState.getString(MainActivityFragment.TARGET_LANG);
}
key = mHelper.getKey(source_lang, target_lang);
mTranslater = new Translater(source_lang, target_lang, key);
setHasOptionsMenu(true);
setToolbarText();
}
public void restoreWords(ArrayList<String> w1, ArrayList<String> w2){
System.out.println("..................RESTORE WORDS....................");
mAdapter.restoreWords(w1, w2, mRecyclerView);
}
onCreate in Activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
helper = new Helper();
mInAppPurchase = new InAppPurchase(this, this);
mInAppPurchase.setUpNoQuery();
setContentView(R.layout.activity_translate);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mFragment = new TranslateActivityFragment();
View v = LayoutInflater.from(getApplicationContext()).inflate(R.layout.start_purchase_ui, null, false);
createPopup(v, this);
getSupportFragmentManager().beginTransaction().replace(R.id.translate_layout, mFragment).commit();
}
I have looked around and seen some suggestions to change getItemCount to not return 0. That did not help and I do not really see how that can be the problem. Here it says for ListViews one must do the restoration in either onCreateView or onActivityCreated, that did not help either.
Note that notifyDataSetChangedis called in addData(Words word)
EDIT: I have changed the flow to the following:
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_translate, container, false);
mRecyclerView = root.findViewById(R.id.translate_recycle);
mLayoutManager = new LinearLayoutManager(getActivity(), LinearLayout.VERTICAL, false);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new CustomAdapter(mRecyclerView, this.getContext(), this);
mRecyclerView.setAdapter(mAdapter);
return root;
}
#Override
public void onViewCreated(View v, Bundle savedInstanceState){
mHelper = new Helper();
if (savedInstanceState == null) {
// Create helper instance
// Get the input view from which we get the source word
textInput = v.findViewById(R.id.source_input);
// Extract the chosen langauges
Intent intent = getActivity().getIntent();
source_lang = intent.getStringExtra(MainActivityFragment.SOURCE_LANG);
target_lang = intent.getStringExtra(MainActivityFragment.TARGET_LANG);
} else {
source_lang = savedInstanceState.getString(MainActivityFragment.SOURCE_LANG);
target_lang = savedInstanceState.getString(MainActivityFragment.TARGET_LANG);
ArrayList<String> w1 = savedInstanceState.getStringArrayList(TranslateActivity.W1LIST);
ArrayList<String> w2 = savedInstanceState.getStringArrayList(W2LIST);
restoreWords(w1,w2);
}
key = mHelper.getKey(source_lang, target_lang);
mTranslater = new Translater(source_lang, target_lang, key);
setHasOptionsMenu(true);
setToolbarText();
}
More Information:
I have an EditText item from which I read the input and add to the mAdapter. After rotation, that does still work. It is only when I try to re-insert the saved data it doesn't work. So I suspect restoreWords are called from the wrong method?

So it seems like the solution was to do the restoration in the Activity instead of the Fragment. I did almost the same exactly as in my question. I overwrote onRestoreInstanceState and called restoreWords implemented as
public void restoreWords(ArrayList<String> w1, ArrayList<String> w2){
System.out.println("..................RESTORE WORDS....................");
for (int i = 0; i < w1.size(); ++i){
Words tmp = new Words(w1.get(i), w2.get(i), 0, 0, 0, false);
System.out.println(tmp.getW1() + " --- " + tmp.getW2());
mFragment.addWordToView(tmp);
}
System.out.println("-------------------Number of words in adapter: " + mFragment.getAdapter().getItemCount());
}
Then it magically worked. Can someone explain why?

How to get the data from the fragment in viewpager when dynamically added fragments are swiped in swipeable tabs?

I am working on an app that includes shopping feature and items are added to cart.
I have navigation drawer. In that, I have my first fragment called as "POSFragment" in which I have implemented a viewpager as data to be shown in the form of swipeable tabs. The data will be inflated dynamically. So, I have used PagerTabStrip and a viewpager. There is a common fragment called "MenuDetailFragment" in which data will be inflated dynamically through a webservice. the adapter for this fragment is "MenuPagerAdapter". Now, In this fragment the data will shown in listview. In Listview in each row items can be incremented or decremented using plus and minus Buttons in each row. Between these button there is textview where the quantity will be displayed correspondingly. I have used a Linkedhashmap on both buttons so, the items along with the quantity is saved in linkedhashmap and then in Sharedpreferences. It's working fine till now. The issue occurs when I swipe in the View pager and next fragment appears and When I click on increment button or decrement button on item there. In shared preferences, It starts saving the current fragment items and previous fragment data is not there anymore. I have already used the "yourcustomviewpager.setOffscreenPageLimit(3)" So, I can see the selected items with the quantities whe I swipe to and fro but the data i stored in sharedpreferences using Linkedhashmap is not there instead current fragment's data is saved. I want that the new data is added to previous data and data in all the fragments should persist. Is there a way to do so? I have been facing this issue for quite a long time.
Here are some screenshots and relevant code snippet.
public class PosFragment extends Fragment {
private ViewPager viewPager;
View rootview;
String code;
String name;
String desc;
String rate;
String key;
Button viewCartBtn;
static TextView displayPrice;
static TextView noOfItemsInCart;
RippleView rippleView;
//private sendPosition pos;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
Log.e("oncreateview", "called");
// Inflate the layout for this fragment
rootview = inflater.inflate(R.layout.pos_fragment_layout, container, false);
initViews();
new AsyncTaskGetMenu().execute();
return rootview;
}
public void initViews() {
Log.e("init", "called");
viewPager = (ViewPager) rootview.findViewById(R.id.viewPager);
Button viewCartButton = (Button) rootview.findViewById(R.id.view_cart_btn);
viewPager.setOffscreenPageLimit(3);
viewCartBtn = (Button) rootview.findViewById(R.id.view_cart_btn);
AppMethods.setGlametrixBoldFont(getActivity(), viewCartBtn);
displayPrice = (TextView) rootview.findViewById(R.id.textView_totalprice_cart);
noOfItemsInCart = (TextView) rootview.findViewById(R.id.cart_items_quantity);
viewCartBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), ViewCartActivity.class);
intent.putExtra(AppConstants.SUBTOTAL, Integer.parseInt(displayPrice.getText().toString()));
startActivity(intent);
}
});
LinearLayout itemsInCartLinearLayout = (LinearLayout) rootview.findViewById(R.id.ll_items_in_cart);
itemsInCartLinearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), ViewCartActivity.class);
intent.putExtra(AppConstants.SUBTOTAL, Integer.parseInt(displayPrice.getText().toString()));
startActivity(intent);
}
});
}
This is "MenuDetailFragment" class
public class MenuDetailFragment extends Fragment {
View rootview;
private ListView listView;
private ArrayList<MenuHeadingDetailsModel> menuheadingDetailList;
private Communicate comm;
LinkedHashMap<String, ViewCartDetailsModel> viewCartDetailsModelMap = new LinkedHashMap<>();
ViewCartDetailsModel viewCartDetailsModel;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootview = inflater.inflate(R.layout.menu_list, container, false);
InitializeViews();
return rootview;
}
public void InitializeViews() {
listView = (ListView) rootview.findViewById(R.id.menu_items_list);
Bundle bundle = getArguments();
menuheadingDetailList = bundle.getParcelableArrayList(AppConstants.MENU_KEY);
listView.setAdapter(new MenuAdapter(getActivity(), menuheadingDetailList));[enter image description here][1]
This is"MenuPagerAdapter" class
public class MenuPagerAdapter extends FragmentStatePagerAdapter {
List<MenuModel> menu;
public MenuPagerAdapter(FragmentManager fm, List<MenuModel> menuList) {
super(fm);
this.menu = menuList;
}
#Override
public CharSequence getPageTitle(int position) {
return menu.get(position).getHeading().toString();
}
private List<MenuHeadingDetailsModel> getMenuHeadingDetails(int pos) {
return this.menu.get(pos).getMenuHeadingDetailList();
}
#Override
public Fragment getItem(int position) {
Fragment fragment = new MenuDetailFragment();
Bundle bundle = new Bundle();
bundle.putParcelableArrayList(AppConstants.MENU_KEY, (ArrayList<? extends Parcelable>) getMenuHeadingDetails(position));
fragment.setArguments(bundle);
return fragment;
}
#Override
public int getCount() {
return menu.size();
}
#Override
public void unregisterDataSetObserver(DataSetObserver observer) {
if (observer == null) {
super.unregisterDataSetObserver(observer);
}
}
#Override
public void destroyItem (ViewGroup container, int position, Object object)
{
Log.e("destroyitem","called");
}
}
class MenuAdapter extends BaseAdapter {
//ViewHolder holder;
Context context;
List<MenuHeadingDetailsModel> myItems = new ArrayList<>();
Button buttonPlus, buttonMinus;
int totalAmount = 0;
int pagePosition;
public MenuAdapter(Context context, List<MenuHeadingDetailsModel> myItems) {
this.context = context;
this.myItems = myItems;
}
#Override
public int getCount() {
return myItems.size();
}
#Override
public Object getItem(int position) {
return myItems.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder = new ViewHolder();
final LayoutInflater inflater = getActivity().getLayoutInflater();
convertView = inflater.inflate(R.layout.menu_list_item, null);
viewHolder.codeText = (TextView) convertView.findViewById(R.id.textView_code);
viewHolder.nameText = (TextView) convertView.findViewById(R.id.textView_name);
AppMethods.setGlametrixBoldFont(getActivity(), viewHolder.nameText);
viewHolder.descText = (TextView) convertView.findViewById(R.id.textView_desc);
viewHolder.rateText = (TextView) convertView.findViewById(R.id.textView_rate);
viewHolder.textViewNoOfItems = (TextView) convertView.findViewById(R.id.tv_no_of_items);
buttonMinus = (Button) convertView.findViewById(R.id.button_minus);
buttonPlus = (Button) convertView.findViewById(R.id.button_plus);
final MenuHeadingDetailsModel menu = myItems.get(position);
viewHolder.codeText.setText(menu.getCode());
viewHolder.nameText.setText(menu.getItemName());
viewHolder.descText.setText(menu.getDescription());
viewHolder.rateText.setText(menu.getRate());
viewHolder.textViewNoOfItems.setText("" + menu.getQuantity());
buttonPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MenuHeadingDetailsModel menuList = myItems.get(position);
menuList.setQuantity(menuList.getQuantity() + 1);
myItems.set(position, menuList);
int itemRate = Integer.parseInt(myItems.get(position).getRate());
int itemQuan = menuList.getQuantity();
String code = menuList.getCode();
String name = menuList.getItemName();
int totalAmountPerItem = itemQuan * itemRate;
viewCartDetailsModel = new ViewCartDetailsModel(code, name, itemQuan, itemRate);
viewCartDetailsModelMap.put(viewCartDetailsModel.getCode(), viewCartDetailsModel);
Log.e("hashmap", "size" + viewCartDetailsModelMap.size());
Gson gson = new Gson();
String hashMapToString = gson.toJson(viewCartDetailsModelMap);
AppPreferences.saveDataInSharedpreferences(getActivity(), AppConstants.VIEW_ITEMS_INT_CART_KEY, hashMapToString);
totalAmount += itemRate;
int amount = totalAmount;
onButtonPressedForAmount(amount);
notifyDataSetChanged();
int quan = 0;
TextView tv;
for (int i = 0; i < listView.getCount(); i++) {
View view = listView.getAdapter().getView(i, null, null);
tv = (TextView) view.findViewById(R.id.tv_no_of_items);
quan = quan + Integer.parseInt(tv.getText().toString());
}
onButtonClickedForQuantity(quan);
}
}
);
buttonMinus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MenuHeadingDetailsModel menuList = myItems.get(position);
if ((menuList.getQuantity() - 1) >= 0) {
menuList.setQuantity(menuList.getQuantity() - 1);
myItems.set(position, menuList);
int itemRate = Integer.parseInt(myItems.get(position).getRate());
int itemQuan = menuList.getQuantity();
String code = menuList.getCode();
String name = menuList.getItemName();
//int totalAmountPerItem = itemQuan * itemRate;
viewCartDetailsModel = new ViewCartDetailsModel(code, name, itemQuan, itemRate);
if (itemQuan == 0) {
viewCartDetailsModelMap.remove(code);
} else {
viewCartDetailsModelMap.put(viewCartDetailsModel.getCode(), viewCartDetailsModel);
}
Gson gson = new Gson();
String hashMapToString = gson.toJson(viewCartDetailsModelMap);
AppPreferences.saveDataInSharedpreferences(getActivity(), AppConstants.VIEW_ITEMS_INT_CART_KEY, hashMapToString);
if (totalAmount > 0) {
totalAmount -= itemRate;
Log.e("totalamount", "minus" + totalAmount);
int amount = totalAmount;
onButtonPressedForAmount(amount);
}
} else {
menuList.setQuantity(0);
myItems.set(position, menuList);
}
notifyDataSetChanged();
int quan = 0;
TextView tv;
for (int i = 0; i < listView.getCount(); i++) {
View view = listView.getAdapter().getView(i, null, null);
tv = (TextView) view.findViewById(R.id.tv_no_of_items);
quan = quan + Integer.parseInt(tv.getText().toString());
}
onButtonClickedForQuantity(quan);
}
}
);
return convertView;
}
public void onButtonPressedForAmount(int userData) {
if (comm != null) {
comm.sendAmount(userData);
}
}
public void onButtonClickedForQuantity(int quantity) {
if (comm != null) {
comm.sendQuantity(quantity);
}
}
class ViewHolder {
TextView nameText;
TextView codeText;
TextView descText;
TextView rateText;
TextView textViewNoOfItems;
}
}
//For settings fonts to the alert diaolog for customization of items
//public void setGlametrixBoldFont(TextView textView) {
//Typeface typeface = Typeface.createFromAsset(getActivity().getAssets(), "fonts/GlametrixBold.otf");
//textView.setTypeface(typeface);
// }
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
comm = (Communicate) activity;
} catch (Exception e) {
AppMethods.getStackTrace(e);
}
}
public interface Communicate {
public void sendAmount(int amount);
public void sendQuantity(int quantity);
}
// public void getPosition(int Position) {
//
// int pagePosition = Position;
// Log.e("pos", " " + pagePosition);
// }
}

You can get your current fragment inside view pager by following below way
SampleFragment sampleFr = (SampleFragment) viewPager.getAdapter().instantiateItem(viewPager, 0);
Now you can access any data you want using that fragment.
For the first time adding fragments in view pager do like below way.
BaseFragment frTimeLine = (BaseFragment) Fragment.instantiate(this, SampleFragment.class.getName());
fragments.add(frTimeLine);
BaseFragment frEarnTiqs = (BaseFragment) Fragment.instantiate(this, SampleFragment1.class.getName());
fragments.add(frEarnTiqs);
adapter = new ViewPagerAdapter(getSupportFragmentManager(), getResources(), fragments);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(3);

ViewPager with programmatically created recyclerView lists in it

I am having some trouble with my app, I am trying to develop a list app that you have the option to add new "Goals" to as well as new lists so that you can categorize goals to a list like the list object title can be "Eat healthy" and then you'll have goals inside like "Eat more vegetables", etc. So in order to do this I have set up a ViewPagerHost class that grabs all the List objects from a SQLite database and initializes a factory developed "List fragment" that handles all the logic of adding a goal, editing and deleting, etc. I believe I've gotten this to work correctly because everything on the database side seems to work fine, and then the other classes are just supposed to display and manipulate that information. But everything on the display side seems to be going wrong. I have each view in the recyclerview display a star next to any goal marked as "important" or "life changing" but it displays the star wherever it wants. Also the list does not load until I've click on something.
public class ViewPagerHost extends Activity_Logger {
private static final String ARG_TITLE = "title";
private ViewPager mViewPager;
private ArrayList<Fragment> mFragmentList;
private ArrayList<GoalList> goalList;
private ArrayList<Goal> goalArrayList;
Database_Controller controller;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_pager_host);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
MobileAds.initialize(getApplicationContext(), "ad-String");
AdView adView = (AdView) findViewById(R.id.ad);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);
setSupportActionBar(toolbar);
toolbar.setTitle("Ambition");
FragmentManager fragmentManager = getSupportFragmentManager();
controller = Database_Controller.get(getApplicationContext());
goalList = controller.getAllLists();
goalArrayList = controller.getAllGoals();
mViewPager = (ViewPager)findViewById(R.id.view_fragments);
if(goalList.get(0) == null){
GoalList listOne = new GoalList();
listOne.setTitle("DEFAULT");
controller.insertList(listOne);
for(int i =0; i< goalArrayList.size(); i++){
goalArrayList.get(i).setWhich_List(listOne.getTitle());
controller.updateGoal(goalArrayList.get(i));
}
}
mFragmentList = getFragmentList(goalList);
ViewPagerAdapter adapter = new ViewPagerAdapter(fragmentManager, mFragmentList);
if(adapter == null){
}else{
mViewPager.setAdapter(adapter);
}
}
public ArrayList<Fragment> getFragmentList(ArrayList<GoalList> list){
mFragmentList = new ArrayList<>();
Bundle bundle = new Bundle();
for(int i = 0; i< list.size(); i++){
List_Fragment list_fragment = new List_Fragment();
bundle.putString(ARG_TITLE, goalList.get(i).getTitle());
list_fragment.setArguments(bundle);
mFragmentList.add(list_fragment);
}
return mFragmentList;
}
}
Here is my ViewPagerHost class that creates the factory list.
public class List_Fragment extends Fragment {
private RecyclerView mRecyclerView;
private static final String ARG_TITLE = "title";
private static final String ARG_GOALNAME ="Goal";
private static final String ARG_IMPORTANT = "Important";
private Database_Controller mDatabaseController;
private static final String ARG_ID = "ID";
ArrayList<Goal> goalList;
LinearLayoutManager manager;
public RecyclerView.Adapter adapter;
public ReceiverThread UiThread;
FragmentManager fragmentManager;
String list_title;
public List_Fragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_list_, container, false);
Bundle bundle = getArguments();
if(bundle != null){
list_title= bundle.getString(ARG_TITLE);
}
mDatabaseController = mDatabaseController.get(getContext());
goalList = mDatabaseController.getAllListsGoals(list_title);
mRecyclerView = (RecyclerView)view.findViewById(R.id.recyclerview);
manager = new LinearLayoutManager(getActivity());
UiThread = new ReceiverThread();
mRecyclerView.setLayoutManager(manager);
final RecyclerView_Adapter wrapperClass = new RecyclerView_Adapter(goalList,getContext(),this);
adapter = wrapperClass.adapter;
for(int counter =0; counter < goalList.size(); counter++){
System.out.println(goalList.get(counter).getWhich_List());
}
mRecyclerView.setAdapter(adapter);
fragmentManager= getFragmentManager();
//adapter goes here
final FloatingActionButton fab = (FloatingActionButton)view.findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Fragment fragment = List_Fragment.this;
AddNew_PopUp popUp = AddNew_PopUp.newInstance(fragment);
popUp.setTargetFragment(fragment, 0);
popUp.show(fragmentManager, "PopUpDialog");
}
});
return view;
}
public class ReceiverThread extends Thread {
#Override
public void run() {
super.run();
getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
goalList.clear();
ArrayList<Goal>newGoalList = mDatabaseController.getAllGoals();
goalList.addAll(newGoalList);
adapter.notifyDataSetChanged();
}
});
}
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 0){
if(resultCode == Activity.RESULT_OK){
Goal newGoal = new Goal();
String GoalName = data.getStringExtra(ARG_GOALNAME);
if (GoalName.isEmpty()) {
Toast.makeText(getContext(), R.string.NoGoal, Toast.LENGTH_SHORT).show();
} else {
newGoal.setmIsImportant(data.getBooleanExtra(ARG_IMPORTANT, false));
newGoal.setmGoalName(GoalName);
newGoal.setWhich_List(ARG_TITLE);
mDatabaseController.insertGoal(newGoal);
}
}
}else{
if(requestCode == 1){
if(resultCode == Activity.RESULT_OK){
String id = data.getStringExtra(ARG_ID);
Toast.makeText(getContext(),R.string.flush, Toast.LENGTH_LONG).show();
mDatabaseController.deleteGoal(id);
}
}else{
if(requestCode == 2){
if(resultCode == Activity.RESULT_OK){
String goalName = data.getStringExtra(ARG_GOALNAME);
Boolean isImportant = data.getBooleanExtra(ARG_IMPORTANT, false);
UUID id = UUID.fromString(data.getStringExtra(ARG_ID));
Goal goal = mDatabaseController.getGoal(id.toString());
goal.setmIsImportant(isImportant);
goal.setmGoalName(goalName);
mDatabaseController.updateGoal(goal);
}
}
}
}
UiThread.run();
}
public ReceiverThread getUiThread() {
return UiThread;
}
}
This is the list fragment that is created for every list in the database. It calls methods and manipulates data based off the user's actions.
public class RecyclerView_Adapter{
private ArrayList<Goal> mGoals;
MyAdapter adapter;
Context context;
private Database_Controller mDatabaseController;
MediaPlayer mediaPlayer;
Fragment fragment;
public RecyclerView_Adapter(ArrayList<Goal> goals, Context cntxt, Fragment fragments) {
mGoals = goals;
adapter = new MyAdapter(mGoals);
context = cntxt;
mediaPlayer = new MediaPlayer();
fragment = fragments;
mDatabaseController = Database_Controller.get(context);
}
//////////////////////////////////ADAPTER\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
private class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
private List<Goal> mGoals;
public MyAdapter(List<Goal> goals) {
mGoals = goals;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.recycler_view_item_layout, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
final Goal goal = mGoals.get(position);
holder.bindGoal(goal);
}
#Override
public int getItemCount() {
return mGoals.size();
}
}
////////////////////////////////////ADAPTER\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
///////////////////////////////////VIEW HOLDER\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
public class MyViewHolder extends RecyclerView.ViewHolder {
private TextView mTextView, importantTXT;
private CheckBox mCheckBox;
private Goal mGoal;
private ImageView imgView;
public MyViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AppCompatActivity context = (AppCompatActivity) v.getContext();
FragmentManager manager = context.getSupportFragmentManager();
Edit_PopUp dialog = Edit_PopUp.newInstance(mGoal);
dialog.setTargetFragment(fragment, 2);
dialog.show(manager, "EditDialog");
}
});
itemView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
//Add delete thingy
AppCompatActivity context = (AppCompatActivity) v.getContext();
FragmentManager manager = context.getSupportFragmentManager();
MoreOptions_PopUp dialog = MoreOptions_PopUp.newInstance(mGoal);
dialog.setTargetFragment(fragment, 1);
dialog.show(manager, "GoalDialog");
return true;
}
});
mTextView = (TextView) itemView.findViewById(R.id.text);
mCheckBox = (CheckBox) itemView.findViewById(R.id.checkbox);
imgView = (ImageView) itemView.findViewById(R.id.imageView);
importantTXT = (TextView) itemView.findViewById(R.id.Important_textView);
mCheckBox.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
mGoal.setFinished(mCheckBox.isChecked());
mDatabaseController.updateGoal(mGoal);
if (mCheckBox.isChecked() == true) {
boolean value = checkWinning(mGoals,context);
PlaySound(value, mGoal.ismIsImportant(), v);
}
}
});
}
public void bindGoal(Goal goal) {
mGoal = goal;
mCheckBox.setChecked(mGoal.isFinished());
mTextView.setText(mGoal.getmGoalName());
if (mGoal.ismIsImportant()) {
imgView.setImageResource(R.mipmap.ic_stars_pressed);
importantTXT.setText(R.string.isImportant);
}
}
public boolean checkWinning(ArrayList<Goal> goals, Context context) {
for (int i = 0; i < goals.size(); i++) {
if (goals.get(i).isFinished() == false) {
return false;
}
}
return true;
}
public void PlaySound(Boolean winningSound, boolean isImportant, View view) {
if(winningSound){
mediaPlayer = MediaPlayer.create(context,R.raw.victory);
Snackbar snackbar = Snackbar.make(view, R.string.completion, Snackbar.LENGTH_LONG);
snackbar.show();
mediaPlayer.start();
}else {
if (isImportant) {
mediaPlayer = MediaPlayer.create(context, R.raw.collect);
mediaPlayer.start();
Snackbar snackbar = Snackbar.make(view, R.string.congrats, Snackbar.LENGTH_SHORT);
snackbar.show();
} else {
mediaPlayer = MediaPlayer.create(context, R.raw.success);
Snackbar snackbar = Snackbar.make(view, R.string.lessCongrats, Snackbar.LENGTH_SHORT);
snackbar.show();
mediaPlayer.start();
}
}
}
}
////////////////////////////////////VIEW HOLDER\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
public MyAdapter getAdapter() {
return adapter;
}
public Fragment getFragment() {
return fragment;
}
}
Here is my adapter class that plays sounds OnClick and binds the view to the Recyclerview.
Any help would be greatly appreciated!

The problem with the stars displayed in every row will be caused because you might be setting them when needed but not hiding them when not needed.
You will have to implement something like this in the getView() method of your adapter.
ImageView starView = (ImageView) v.findViewById(R.id.starView);
starView.setVisibility(goals.get(position).isSpecial() ? View.Visible : View.Gone);

ListView in ListFragment keeps accumulating data

I am unable to refresh my ListView in ListFragment with new data. Instead the new data is added to the previous.
The time period is from 6AM to 5PM for each entity. Then new data is appended to the list restarting at 6AM for another entity. The data for the first entity should be cleaned before the second is added to the ListView.
Here is the code:
public class FragmentStatePagerSupport extends FragmentActivity {
static final int NUM_ITEMS = 4; //control number of fragments
MyAdapter mAdapter;
ViewPager mPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(null);
mPager.setAdapter(mAdapter);
}
//===============================================================================================
public static class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
fragNumber = position;
return ArrayListFragment.newInstance(position);
}
}
//===============================================================================================
public static class ArrayListFragment extends ListFragment {
Integer mNum;
String FORMAT_LINE = "%s%7s%7s%10s%16s";
static ArrayListFragment newInstance(int num) {
ArrayListFragment f = new ArrayListFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
View tv = v.findViewById(R.id.text);
View tvd = v.findViewById(R.id.tv_description);
String title = "";
switch (mNum){
case 0:title = MyGlobals.getInstance().getToday();break;
case 1:title = MyGlobals.getInstance().getTomorrow();break;
case 2:title = MyGlobals.getInstance().getDayAfter();break;
case 3:title = MyGlobals.getInstance().getDayDayAfter();break;
}
((TextView) tv).setText(MyGlobals.getInstance().getName() + " on " + title);
((TextView) tvd).setText(String.format(FORMAT_LINE, "time", "temp", "rain", "wind", "weather"));
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ArrayList<Data> row = Data.getRows(mNum);
ListViewAdapter adapter = new ListViewAdapter(getActivity(), row);
getListView().setAdapter(null);
getListView().setAdapter(adapter);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
v.setBackgroundColor(getResources().getColor(R.color.blue));
}
}
//==============================================================================================
public static class ListViewAdapter extends ArrayAdapter<Data> {
public static class ViewHolder{
TextView time;
TextView temp;
TextView rain;
TextView wind_speed;
TextView weather;
}
public ListViewAdapter(Context context, ArrayList<Data> list) {super(context, R.layout.text_listview, list); }
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Data data = getItem(position);
ViewHolder holder;
if(convertView == null){
holder=new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView=inflater.inflate(R.layout.text_listview,parent,false);
holder.time=(TextView) convertView.findViewById(R.id.time);
holder.temp=(TextView) convertView.findViewById(R.id.temp);
holder.rain=(TextView) convertView.findViewById(R.id.rain);
holder.wind_speed=(TextView) convertView.findViewById(R.id.wind);
holder.weather=(TextView) convertView.findViewById(R.id.weather);
convertView.setTag(holder);
}else{
holder=(ViewHolder) convertView.getTag();
}
holder.time.setText(data.time);
holder.temp.setText(data.temp);
holder.rain.setText(data.rain);
holder.wind_speed.setText(data.wind_speed);
holder.weather.setText(data.weather);
return convertView;
}
}
}
This last piece populates the ListView. The calls adapter.clear() and adapter.notifyDataSetChanged() does not resolve the problem.
There is a similar question from 3 years ago How update ListView in ListFragment from FragmentActivity? still without accepted response despite the 6836 views.
Thanks a Lot.
The GetRows(mNum) piece as requested:
public class Data {
public String time;
public String temp;
public String rain;
public String wind_speed;
public String weather;
public Data(String time, String temp, String rain, String wind_speed, String weather) {
this.time = time;
this.temp = temp;
this.rain = rain;
this.wind_speed = wind_speed;
this.weather = weather;
}
public static ArrayList<Data> getRows(int fragNumber) {
int mNum = fragNumber;
int size;
String myList[] = null;
ArrayList<Data> list = new ArrayList<Data>();
switch (mNum) {
case 0://Today
size = MyGlobals.getInstance().getToday("time").size();
myList = new String[size];
for (int i = 0; i < size; i++) {
String time = (String) MyGlobals.getInstance().getToday("time").get(i);
String temp = (String) MyGlobals.getInstance().getToday("temperature").get(i);
String wind_speed = (String) MyGlobals.getInstance().getToday("wind_speed").get(i);
String pop = (String) MyGlobals.getInstance().getToday("pop").get(i);
//String wind_gust = (String) MyGlobals.getInstance().getToday("wind_gust").get(i); //when null breaks code
String weather = (String) MyGlobals.getInstance().getToday("weather").get(i);
if (time.length() == 4) time = "0" + time;
if (wind_speed.length() == 1) wind_speed = "0" + wind_speed;
if (pop.length() == 1) pop = "0" + pop;
list.add(new Data(time,temp,pop,wind_speed,weather));
}
return list;
case 1://Tomorrow
...snip... same as above with pertinent variables,...
case 2://DayAfter
...snip...
case 3://DayDayAfter
...snip....
case 4:// is an error
Log.d("***error***", "list got to case 5");
}
return list;
}
}

Try this;
Before adding new list of Data to the existing list, use list.clear();
Add new Data to the list and you should have only newly added data in the list..
pass the list to your adapter class.
Notify adapter of the new data i.e. adapter.notifyDataSetChanged()
You are returning list twice in your getRows()
remove the "return list" before the case structure
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
// Clear old list here before adding new one.
if (list! = null)
{
list.clear();
}
// Add New list
list = Data.getRows(mNum);
ListViewAdapter adapter = new
ListViewAdapter(getActivity(), list);
getListView().setAdapter(adapter);
adapter.notifyDataSetChange();
}

It's because everytime you set an Adapter, it will really be added., remove all its data first before setting again so it will be like
mPager.setAdapter(null);
before doing
mPager.setAdapter(mAdapter);

How to update fragment's data used in ViewPager? View is not showing the updated data

I know the same question has been asked so many times but I am not able to solve my issue.
I have created an Activity which has a ViewPager which should have 4 Pages.
I am using the same Fragment for all pages. The Fragment has a GridView which should be updated whenever I swipe to the other page.
Following are the classes & XML layouts I have used to create it.
Activity layout activity_discover.xml
<android.support.v4.view.ViewPager
android:id="#+id/activity_discover_view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip" >
<android.support.v4.view.PagerTabStrip
android:id="#+id/activity_discover_pager_tab_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white"
android:textColor="#color/black"
android:textSize="#dimen/header_text" />
</android.support.v4.view.ViewPager>
</RelativeLayout>
Activity DiscoverActivity.java
public class DiscoverActivity extends FragmentActivity implements OnClickListener, OnPageChangeListener
{
private final static String TAG = "DiscoverActivity";
private UtilDialog utilDialog;
MPagerAdapter adapterViewPager;
PagerTabStrip pagerTabStrip;
ViewPager viewPager;
public ArrayList<String> listCategory;
LMProgressDialog progressDialog;
private RelativeLayout relativeCountry;
private RelativeLayout relativeCity;
private TextView tvCountry;
private TextView tvCity;
private String selectedCategory;
private int selectedCityID = 0;
private int selectedCategoryID = 0;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_discover);
initParameters();
initView();
}
void initParameters()
{
progressDialog = new LMProgressDialog(this);
utilDialog = new UtilDialog(this);
preferences = PreferenceManager.getDefaultSharedPreferences(this);
editor = preferences.edit();
editor.commit();
selectedCategory = getResources().getString(R.string.adventure);
listCategory = new ArrayList<String>();
listCategory.add(getResources().getString(R.string.adventure));
listCategory.add(getResources().getString(R.string.night_life));
listCategory.add(getResources().getString(R.string.life_styles));
listCategory.add(getResources().getString(R.string.events));
}
void initView()
{
viewPager = (ViewPager) findViewById(R.id.activity_discover_view_pager);
viewPager.setOnPageChangeListener(this);
adapterViewPager = new MPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapterViewPager);
pagerTabStrip = (PagerTabStrip) findViewById(R.id.activity_discover_pager_tab_strip);
pagerTabStrip.setTabIndicatorColor(getResources().getColor(R.color.white));
}
#Override
protected void onDestroy()
{
super.onDestroy();
}
public class MPagerAdapter extends FragmentPagerAdapter
{
private Map<Integer, String> mFragmentTags;
private FragmentManager mFragmentManager;
public MPagerAdapter(FragmentManager fm)
{
super(fm);
mFragmentManager = fm;
mFragmentTags = new HashMap<Integer, String>();
}
#Override
public int getCount()
{
return 4;
}
#Override
public Fragment getItem(int position)
{
Fragment fragment = Fragment.instantiate(DiscoverActivity.this,
FragmentMediaContent.class.getName(), null);
return fragment;
}
#Override
public Object instantiateItem(ViewGroup container, int position)
{
Object obj = super.instantiateItem(container, position);
if (obj instanceof Fragment)
{
// record the fragment tag here.
Fragment f = (Fragment) obj;
String tag = f.getTag();
mFragmentTags.put(position, tag);
}
return obj;
}
public Fragment getFragment(int position)
{
String tag = mFragmentTags.get(position);
if (tag == null)
return null;
return mFragmentManager.findFragmentByTag(tag);
}
#Override
public CharSequence getPageTitle(int position)
{
return listCategory.get(position).toString().toUpperCase();
}
}
#Override
public void onPageScrollStateChanged(int arg0)
{
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2)
{
}
#Override
public void onPageSelected(int position)
{
selectedCategoryID = position;
selectedCategory = listCategory.get(position);
try
{
JSONObject jsonObject = new JSONObject();
jsonObject.put(Constants.CITY_ID, selectedCityID);
jsonObject.put(Constants.CATEGORY, selectedCategory);
makeJsonObjectRequest(Request.Method.POST, jsonObject, API.URL_LOAD_MEDIA);
} catch (JSONException e)
{
e.printStackTrace();
}
}
void prepareMediaList(JSONArray arrayMedia)
{
int noOfMedia = arrayMedia.length();
ArrayList<MediaType> listMedia = new ArrayList<MediaType>();
for (int i = 0; i < noOfMedia; i++)
{
try
{
JSONObject objectMedia = arrayMedia.getJSONObject(i);
int id = objectMedia.getInt(Constants.ID);
String category = objectMedia.getString(Constants.CATEGORY);
String mediaType = objectMedia.getString(Constants.MEDIA_TYPE);
int cityID = objectMedia.getInt(Constants.CITIES_ID);
String path = objectMedia.getString(Constants.PATH);
String thumbnailPath = objectMedia.getString(Constants.THUMBNAIL_PATH);
String description = objectMedia.getString(Constants.DESCRIPTION);
int userID = objectMedia.getInt(Constants.USERS_ID);
listMedia.add(new MediaType(id, mediaType, path, category, userID, cityID, 0, description, thumbnailPath));
} catch (JSONException e)
{
e.printStackTrace();
}
}
FragmentMediaContent fragment = (FragmentMediaContent) adapterViewPager.getFragment(selectedCategoryID);
Log.i(TAG, "fragment: " + fragment);
fragment.updateData(listMedia, selectedCategory);
}
}
Fragment class FragmentMediaContent.java:
public class FragmentMediaContent extends Fragment
{
private final static String TAG = "FragmentMediaContent";
public static final String FRAGMENT_POSITION = null;
private GridView gridView;
private UtilDialog utilDialog;
private SharedPreferences preferences;
private Editor editor;
private ArrayList<MediaType> listMedia;
MediaAdapter mediaAdapter;
private int cityID;
private String category;
LMProgressDialog progressDialog;
TextView tvTest;
public static FragmentMediaContent newInstance(int num)
{
FragmentMediaContent f = new FragmentMediaContent();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_media_content, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
initParameters();
initViews();
}
void initParameters()
{
getSize();
listMedia = new ArrayList<MediaType>();
utilDialog = new UtilDialog(getActivity());
progressDialog = new LMProgressDialog(getActivity());
preferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
editor = preferences.edit();
mediaAdapter = new MediaAdapter(getActivity(), listMedia);
}
void initViews()
{
tvTest = (TextView) getActivity().findViewById(R.id.fragment_media_content_tv_test);
tvTest.setText(category+" no of media");
tvTest.setVisibility(View.GONE);
gridView = (GridView) getActivity().findViewById(R.id.fragment_media_content_grid_view);
gridView.setAdapter(mediaAdapter);
}
/**
* MediaAdapter : ArrayAdapter class which prepares view for list of
* MediaType.
*
*/
class MediaAdapter extends ArrayAdapter<MediaType>
{
MediaAdapter(Context context, ArrayList<MediaType> list)
{
super(context, R.layout.cell_media_view, R.id.cell_media_view_tv_test, list);
}
public View getView(int position, View convertView, ViewGroup parent)
{
View row = super.getView(position, convertView, parent);
MediaViewHolder holder = (MediaViewHolder) row.getTag();
if (holder == null)
{
holder = new MediaViewHolder(row);
row.setTag(holder);
}
final MediaType mediaType = getMedia(position, this);
String thumbnailPath = mediaType.getThumbnailPath();
String path = mediaType.getPath();
String type = mediaType.getMediaType();
// imageLoader.get(type.equals(Constants.TYPE_IMAGE) ? path :
// thumbnailPath, ImageLoader.getImageListener(holder.ivMedia,
// R.drawable.logo, R.drawable.ic_launcher));
holder.ivType.setVisibility(type.equals(Constants.TYPE_IMAGE) ? View.GONE : View.VISIBLE);
holder.ivMedia.setLayoutParams(new FrameLayout.LayoutParams(THUMBNAIL_SIZE, THUMBNAIL_SIZE));
Picasso.with(getActivity()).load(type.equals(Constants.TYPE_IMAGE) ? path : thumbnailPath).noFade().centerCrop().resize(THUMBNAIL_SIZE, THUMBNAIL_SIZE).placeholder(R.drawable.loading)
.error(R.drawable.no_image).into(holder.ivMedia);
return row;
}
}
public void updateData(ArrayList<MediaType> listMedia, String category)
{
Log.i(TAG, "Updating data for: " + category);
Log.i(TAG, "No of media items: " + listMedia.size());
// this.listMedia.clear();
// this.listMedia.addAll(listMedia);
// mediaAdapter.notifyDataSetChanged();
mediaAdapter = new MediaAdapter(getActivity(), listMedia);
gridView.setAdapter(mediaAdapter);
tvTest.setText(category + ", No of Media : " + listMedia.size());
}
int THUMBNAIL_SIZE = 200;
/**
* #param position
* #return MediaType object from specified position
*/
private MediaType getMedia(int position, MediaAdapter mediaAdapter)
{
return (MediaType) mediaAdapter.getItem(position);
}
}
Fragment fragment_media_content.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/blue"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="#+id/fragment_media_content_tv_test"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#color/white" />
<GridView
android:id="#+id/fragment_media_content_grid_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:horizontalSpacing="5dip"
android:numColumns="3"
android:verticalSpacing="5dip" />
</LinearLayout>
On page swipe (or it could be any other event) I hit an API which gives me some data that I have to update in the corresponding Fragment.
Whenever I get the data from server I call the prepareMediaList method which calls the updateData method of Fragment. I can see in logs that there is data in list but that data is not shown in the Fragment's GridView (not even in TextView).
I am really not getting what is wrong in this.
Now it has become very frustrating, looks so simple but still couldn't find any solution.
Edit
I just tried with one Fragment only & it is working properly. So there is something which has to do with multiples.
Edit 2
I couldn't find the solution for this so I had to switch to alternate way. I removed the Fragments from ViewPager instead I added static views to it. In my case I added four GridViews to ViewPager. This was simple & bit complex but most important thing is, it is working the way I wanted.
But still I am looking for the answer.

After checking your code more in details i see you do not require to re-initliaze your MediaAdapter inside updateData method.
You simply require to update your updateData as
listMedia.clear();
this.listMedia.addAll(listMedia);
mediaAdapter.notifyDatasetChanged();
This will reload your data in gridview. Change i suggested will refresh the data in your arraylist which is being used for rendering gridview and then you notify your mediaAdapter to reload the list.