Develop Reference

How to get the textview values from recyclerview for each item row

I have recyclerview where I am displaying the items with Itemname, Itemrate and quantity of the items which is increased and decreased by +/- buttons respectively. now, i want to get all the values from each item of the recyclerview and send it over the server or save it to local database so how to achieve this.?
//This is My Adapter Class
public class TeaListAdapter extends RecyclerView.Adapter {
//private int num=0;
private List<TeaListPOJO> teaItemList;
private Context mContext;
private Cursor cursor;
int comboCount;
HashMap<Object,Integer> selectedMap = new HashMap ();
private String ItemName;
private String itemrate;
private String qty;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView tvitemName, tvitemRate,tvcount; //number
public ImageView ivItemImg,ivPlus,ivMinus;
public Button btnIncrease,btnDecrease;
RecyclerView.ViewHolder holder;
public MyViewHolder(View view) {
super(view);
tvitemName = (TextView) view.findViewById(R.id.txt_item_name);
tvitemRate = (TextView) view.findViewById(R.id.txt_item_price);
ivItemImg= (ImageView) view.findViewById (R.id.iv_item);
ivPlus=(ImageView) view.findViewById (R.id.row_view_final_order_iv_plus);
ivMinus=(ImageView) view.findViewById (R.id.row_view_final_order_iv_minus);
tvcount=(TextView) view.findViewById (R.id.row_view_final_order_tv_count);
}
}
public TeaListAdapter(List<TeaListPOJO> teaItemList) {
this.mContext=mContext;
this.cursor=cursor;
this.teaItemList = teaItemList;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.rv_placeorder_items, parent, false);
return new MyViewHolder (itemView);
}
#Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
TeaListPOJO tealist = teaItemList.get(position);
holder.tvitemName.setText(tealist.getItemName ());
holder.tvitemRate.setText(AppConstants.INDIAN_RUPEE_SIGN.concat (tealist.getItemRate ()));
holder.ivPlus.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick(View view) {
int count=0;
try{
count = Integer.parseInt(holder.tvcount.getText().toString());
}
catch(Exception e) {
count = 0;
}
//count++;
count = Integer.parseInt(holder.tvcount.getText().toString());
holder.tvcount.setText(String.valueOf(count+ 1));
}
});
holder.ivMinus.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick(View view) {
int count=0;
try{
count = Integer.parseInt(holder.tvcount.getText().toString());
}
catch(Exception e) {
count = 0;
}
if(count>0) {
//count--;
count = Integer.parseInt (holder.tvcount.getText ().toString ());
holder.tvcount.setText (String.valueOf (count - 1));
}
}
});
holder.itemView.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick(View view) {
}
});
/* Intent intent = new Intent (mContext, PlaceOrderActivity.class);
// intent.putExtra("quantity",Integer.parseInt(quantity.getText().toString()));
intent.putExtra ("quantity", qty);
intent.putExtra ("item", ItemName);
intent.putExtra ("itemrate", itemrate);
ItemName = holder.tvitemName.getText().toString();
qty = holder.tvcount.getText().toString();
itemrate=holder.tvitemRate.getText ().toString ();
Log.e("rate",itemrate);
Log.e("qty",qty);*/
byte[] decodedString = new byte[0];
try {
decodedString = Base64.decode(tealist.getImageStr(), Base64.DEFAULT);
// tenantModelPOJO.setLogo(decodedString);
Bitmap bmp = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
holder.ivItemImg.setImageBitmap(Bitmap.createScaledBitmap(bmp, 50, 50,false));
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public int getItemCount() {
return teaItemList.size();
}
}
//This is My Activity Class
public class PlaceOrderActivity extends AppCompatActivity implements AppConstants, View.OnClickListener, WLAPIcalls.OnAPICallCompleteListener {
private List<TeaListPOJO> teaList = new ArrayList<> ();
private RecyclerView recyclerView;
private TeaListAdapter mAdapter;
private View view;
private Button btnPlaceorder;
EditText edtmsg;
public String str;
private Context mContext = PlaceOrderActivity.this;
private int itemCount;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_place_order);
str=getIntent ().getStringExtra ("quantity");
edtmsg= (EditText) view.findViewById (R.id.et_message);
edtmsg.setText (str);
setRecyclerView (view);
getallTeaItems ();
}
List<TeaListPOJO> getTeaItemList(String str) {
Gson gson = new Gson ();
Type listType = new TypeToken<List<TeaListPOJO>> () {
}.getType ();
List<TeaListPOJO> myModelList = gson.fromJson (str, listType);
return myModelList;
}
private List<TeaListPOJO> getallTeaItems() {
if (new AppCommonMethods (mContext).isNetworkAvailable ()) {
WLAPIcalls mAPIcall = new WLAPIcalls (mContext, getString (R.string.getTeaItem), this);
mAPIcall.GetTeaItemList ();
} else {
Toast.makeText (mContext, R.string.no_internet, Toast.LENGTH_SHORT).show ();
}
return null;
}
void setRecyclerView(View view) {
recyclerView = (RecyclerView) findViewById (R.id.recycler_view);
mAdapter = new TeaListAdapter (teaList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager (getApplicationContext ());
recyclerView.setLayoutManager (mLayoutManager);
recyclerView.setItemAnimator (new DefaultItemAnimator ());
recyclerView.setAdapter (mAdapter);
}
#Override
public void onClick(View view) {
}
#Override
public void onAPICallCompleteListner(Object item, String flag, String result) throws JSONException {
if (getString (R.string.getTeaItem).equals (flag)) {
Log.e ("Result", result);
teaList = getTeaItemList (result);
setRecyclerView (view);
}
}
}

Add an extra property in your TeaListPOJO model say count when you press +/- button you have to set count in your model like you set the count in your text view. So in your adapter you have TeaListPOJO list. Show when you want to send data to server get list of TeaListPOJO and also you have list of count.

In the adapter set a call to the API to change the value in the DB.
You shouldn't need to pass the entire data, usually you'll be able to just update that one object you're looking at by passing the id in the URL.
e.g.
https://hostname.domain/api/object/ID
Use a PUT request and pass the info from the object in that row.
If you're creating the back-end of this too then I'd highly suggest you set this up as passing the entire dataset for all rows is not exactly an ideal solution.
If these didn't exist in the first place and they are all created from being in the app then have a button on your main activity that saves the list, then pass the entire list to an API call, most likely will need to parse the data into JSON.
I assume here that if the latter is the case that you have created these objects in a class.

the TeaListPOJO should also need a field for storing the count. Increment or decrement the count value when user's clicks on the + or - button and display the count value to the textview, instead of directly diplaying.
class TeaListPojo{
private int count;
.....
public int getCount()
return this.count
}
public void setCount(int count)
{
this.count = count;
}
}
Here is the code for updating the count textview
public void onBindViewHolder(final MyViewHolder holder, final int position) {
TeaListPOJO tealist = teaItemList.get(position);
.....
.....
holder.ivPlus.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick(View view) {
tealist.setCount( tealist.getCount() + 1);
holder.tvcount.setText(String.valueOf(count));
}
});
holder.ivMinus.setOnClickListener (new View.OnClickListener () {
#Override
public void onClick(View view) {
tealist.setCount(tealist.getCount() - 1)
holder.tvcount.setText (String.valueOf (count));
}
}
});
}

Database appears, but data cannot be filtered or searched

sorry if the explanation is incomplete. I just learned about Android. and in my project this time, I made a filter feature using the radio button
I followed a totorial, but the tutorial uses static data, then I change it to dynamic using my data in the database. all works !! the data appears
but when I type something in the search bar that I make, suddenly my data disappears, I make 3 radio buttons to be selected by the user to be searched / filtered, namely type, price and facilities. the three radio buttons don't work, my data that appears are gone.
How to handle that problem?? if anyone can help me please help, thank you
this is the code
this fragment
public class FilterFragment extends Fragment implements RadioGroup.OnCheckedChangeListener, View.OnClickListener {
private static final String data_url = "http://000.000.00.000/kos/get_kos.php";
RecyclerView mRecyclerView;
ProgressDialog pd;
private Context context;
private RecyclerViewAdapter adapter;
private ArrayList<UserModel> arrayList;
private RadioGroup searchViaRadioGroup;
private EditText searchEditText;
private TextView searchViaLabel;
/* Filter Type to identify the type of Filter */
private FilterType filterType;
/* boolean variable for Filtering */
private boolean isSearchWithPrefix = false;
public FilterFragment() {
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.context = context;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_filter, container, false);
pd = new ProgressDialog(getActivity());
mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
arrayList = new ArrayList<>();
mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), LinearLayoutManager.VERTICAL));
adapter = new RecyclerViewAdapter(getActivity(), arrayList);
mRecyclerView.setAdapter(adapter);
loadjson();
return view;
}
private void loadjson(){
pd.setMessage("Mengambil Data");
pd.setCancelable(false);
pd.show();
JsonArrayRequest arrayRequest = new JsonArrayRequest(Request.Method.POST, data_url, null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
pd.cancel();
Log.d("volley", "response : " + response.toString());
for (int i=0; i < response.length(); i++)
try {
JSONObject data = response.getJSONObject(i);
UserModel md = new UserModel();
md.setJudul(data.getString("judul")); // memanggil nama array yang kita buat
md.setAlamat(data.getString("alamat"));
md.setHarga(data.getString("harga"));
md.setTipe_kos(data.getString("tipe_kos"));
md.setFasilitas(data.getString("fasilitas"));
arrayList.add(md);
} catch (JSONException e) {
e.printStackTrace();
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener(){
#Override
public void onErrorResponse(VolleyError error) {
pd.cancel();
Log.d("volley", "error : " + error.getMessage());
}
});
Controller.getInstance().addToRequestQueue(arrayRequest);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
findViews(view);
implementEvents();
}
//Bind all Views
private void findViews(View view) {
filterType = FilterType.TIPE_KOS;
searchViaRadioGroup = (RadioGroup) view.findViewById(R.id.search_via_radio_group);
searchEditText = (EditText) view.findViewById(R.id.search_text);
searchViaLabel = (TextView) view.findViewById(R.id.search_via_label);
}
//Populate recycler view
private void implementEvents() {
searchViaRadioGroup.setOnCheckedChangeListener(this);
searchViaLabel.setOnClickListener(this);
searchEditText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
//On text changed in Edit text start filtering the list
adapter.filter(filterType, charSequence.toString(), isSearchWithPrefix);
}
#Override
public void afterTextChanged(Editable editable) {
}
});
}
#Override
public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
int pos = radioGroup.indexOfChild(radioGroup.findViewById(checkedId));//get the checked position of radio button
switch (radioGroup.getId()) {
case R.id.search_via_radio_group:
switch (pos) {
case 0:
filterType = FilterType.TIPE_KOS;//Change filter type to Name if pos = 0
break;
case 1:
filterType = FilterType.NUMBER;//Change filter type to Number if pos = 1
break;
case 2:
filterType = FilterType.EMAIL;//Change filter type to Email if pos = 2
break;
}
}
}
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.search_via_label:
//show hide the radio group
if (searchViaRadioGroup.isShown()) {
searchViaLabel.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.up_dropdown, 0);
searchViaRadioGroup.setVisibility(View.GONE);
} else {
searchViaLabel.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.down_dropdown, 0);
searchViaRadioGroup.setVisibility(View.VISIBLE);
}
break;
}
}
}
this adapter
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> {
static class RecyclerViewHolder extends RecyclerView.ViewHolder {
private TextView judul, alamat, tipe_kos, fasilitas, harga;
RecyclerViewHolder(View view) {
super(view);
judul = (TextView) view.findViewById(R.id.judul);
alamat = (TextView) view.findViewById(R.id.alamat);
tipe_kos = (TextView) view.findViewById(R.id.tipe_kos);
fasilitas = (TextView) view.findViewById(R.id.fasilitas);
harga = (TextView) view.findViewById(R.id.harga);
}
}
private ArrayList<UserModel> arrayList;
private ArrayList<UserModel> filterArrayList;//duplicate list for filtering
private Context context;
public RecyclerViewAdapter(Context context, ArrayList<UserModel> arrayList) {
this.arrayList = arrayList;
this.context = context;
this.filterArrayList = new ArrayList<>();//initiate filter list
this.filterArrayList.addAll(arrayList);//add all items of array list to filter list
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.custom_list_filter, viewGroup, false);
return new RecyclerViewHolder(v);
}
#Override
public void onBindViewHolder(final RecyclerViewHolder holder, final int i) {
final UserModel model = arrayList.get(i);
holder.judul.setText(model.getJudul());//menampilkan data
holder.alamat.setText(model.getAlamat());
holder.harga.setText(model.getHarga());
holder.tipe_kos.setText(model.getTipe_kos());
holder.fasilitas.setText(model.getFasilitas());
}
#Override
public int getItemCount() {
return (null != arrayList ? arrayList.size() : 0);
}
// Filter Class to filter data
public void filter(FilterType filterType, String charText, boolean isSearchWithPrefix) {
//If Filter type is TIPE_KOS and EMAIL then only do lowercase, else in case of NUMBER no need to do lowercase because of number format
if (filterType == FilterType.TIPE_KOS || filterType == FilterType.EMAIL)
charText = charText.toLowerCase(Locale.getDefault());
arrayList.clear();//Clear the main ArrayList
//If search query is null or length is 0 then add all filterList items back to arrayList
if (charText.length() == 0) {
arrayList.addAll(filterArrayList);
} else {
//Else if search query is not null do a loop to all filterList items
for (UserModel model : filterArrayList) {
//Now check the type of search filter
switch (filterType) {
case TIPE_KOS:
if (isSearchWithPrefix) {
//if STARTS WITH radio button is selected then it will match the exact TIPE_KOS which match with search query
if (model.getTipe_kos().toLowerCase(Locale.getDefault()).startsWith(charText))
arrayList.add(model);
} else {
//if CONTAINS radio button is selected then it will match the TIPE_KOS wherever it contains search query
if (model.getTipe_kos().toLowerCase(Locale.getDefault()).contains(charText))
arrayList.add(model);
}
break;
case EMAIL:
if (isSearchWithPrefix) {
//if STARTS WITH radio button is selected then it will match the exact EMAIL which match with search query
if (model.getFasilitas().toLowerCase(Locale.getDefault()).startsWith(charText))
arrayList.add(model);
} else {
//if CONTAINS radio button is selected then it will match the EMAIL wherever it contains search query
if (model.getFasilitas().toLowerCase(Locale.getDefault()).contains(charText))
arrayList.add(model);
}
break;
case NUMBER:
if (isSearchWithPrefix) {
//if STARTS WITH radio button is selected then it will match the exact NUMBER which match with search query
if (model.getHarga().startsWith(charText))
arrayList.add(model);
} else {
//if CONTAINS radio button is selected then it will match the NUMBER wherever it contains search query
if (model.getHarga().contains(charText))
arrayList.add(model);
}
break;
}
}
}
notifyDataSetChanged();
}
}
this FilterType
public enum FilterType {
TIPE_KOS, NUMBER, EMAIL;
}
and this user model
package com.example.asus.myapplication.fragment.filter;
public class UserModel {
private String judul, alamat, harga, tipe_kos, fasilitas;
public String getJudul() {
return judul;
}
public String getAlamat() {
return alamat;
}
public String getHarga() {
return harga;
}
public String getTipe_kos() {
return tipe_kos;
}
public String getFasilitas() {
return fasilitas;
}
public void setJudul(String mJudul) {
judul = mJudul;
}
public void setAlamat(String mAlamat) {
alamat = mAlamat;
}
public void setHarga(String mHarga) {
harga = mHarga;
}
public void setTipe_kos(String mTipe_kos) {
tipe_kos = mTipe_kos;
}
public void setFasilitas(String mFasilitas) { fasilitas= mFasilitas;
}
}
another one I do not understand at all for this filter API, I just pulled all the data in my database
My database is like this, which I circle, that's the data I want to filter later

RecyclerView messes up when scrolling

I never asked any question before but hope you'll get my point.
I am making a chat app in which I am using a RecyclerView to show messages. The problem is when I scroll the RecyclerView some of the items disappear from the top and the whole items messes up when I try to add a message it doesn't even scroll to bottom nor added in the ListView.
Here is my RecyclerView:
<android.support.v7.widget.RecyclerView
android:id="#+id/conversation_recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:layout_above="#id/typingConversationLayout"
android:layout_below="#id/topLayout_conversation_activity"
android:layout_marginBottom="-5dp"
android:paddingBottom="7dp" />
Initializing and setting the RecycerView:
linearLayoutManager = new LinearLayoutManager(this);
adapter = new ConversationRecyclerViewAdapter();
conversationRecyclerView.setAdapter(adapter);
conversationRecyclerView.setLayoutManager(linearLayoutManager);
linearLayoutManager.setStackFromEnd(true);
conversationRecyclerView.setHasFixedSize(true);
conversationRecyclerView.setNestedScrollingEnabled(false);
Here is my Adapter class:
private class ConversationRecyclerViewAdapter
extends RecyclerView.Adapter<ConversationRecyclerViewAdapter.ConversationViewHolder> {
#NonNull
#Override
public ConversationViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int i) {
Log.d(TAG, "onCreateViewHolder: Users Find started");
View conversationsView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.layout_message_received, parent, false);
return new ConversationViewHolder(conversationsView);
}
#Override
public void onBindViewHolder(#NonNull final ConversationViewHolder holderConversation, int i) {
Log.d(TAG, "onBindViewHolder: Users Find started at position is " + i);
final int position = holderConversation.getAdapterPosition();
if (mOwnUser_1.get(position)) {
holderConversation.receivedMsgLayout.setVisibility(View.GONE);
holderConversation.sentProfileImg.setImageResource(mUserProfileImg_2.get(position));
holderConversation.sentMsg.setText(mUserText_3.get(position));
} else {
holderConversation.sentMsgLayout.setVisibility(View.GONE);
holderConversation.receivedProfileImg.setImageResource(mUserProfileImg_2.get(position));
holderConversation.receivedMsg.setText(mUserText_3.get(position));
}
Log.d(TAG, "onBindViewHolder: completed at " + position);
}
#Override
public int getItemCount() {
return mOwnUser_1.size();
}
public class ConversationViewHolder extends RecyclerView.ViewHolder {
RelativeLayout receivedMsgLayout, sentMsgLayout;
EmojiTextView receivedMsg, sentMsg;
CircleImageView receivedProfileImg, sentProfileImg;
public ConversationViewHolder(#NonNull View v) {
super(v);
receivedMsgLayout = v.findViewById(R.id.received_message_layout);
sentMsgLayout = v.findViewById(R.id.sent_message_layout);
receivedMsg = v.findViewById(R.id.received_message_text);
sentMsg = v.findViewById(R.id.sent_message_text);
receivedProfileImg = v.findViewById(R.id.received_message_user__profile_image);
sentProfileImg = v.findViewById(R.id.sent_message_user__profile_image);
}
}
}
Here I am adding data to ListView and displaying to the RecyclerView:
sendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String msg = editText.getText().toString().trim();
if (TextUtils.isEmpty(msg)) {
editText.setError("Please add a message");
editText.requestFocus();
} else {
Log.d(TAG, "onClick: send Btn ADDED TEXT.. ");
mOwnUser_1.add(user);
mUserProfileImg_2.add(image);
mUserText_3.add(message);
editText.setText("");
editText.requestFocus();
adapter.notifyItemInserted(mOwnUser_1.size());
conversationRecyclerView.scrollToPosition(mOwnUser_1.size() - 1);
}
}
});
I don't know what i am doing wrong but it does not seem to work as i wanted.
Update Code:
The three listviews:
private ArrayList<Boolean> mOwnUser_1 = new ArrayList<>();
private ArrayList<Integer> mUserProfileImg_2 = new ArrayList<>();
private ArrayList<String> mUserText_3 = new ArrayList<>();
And the way of adding data to adapter:
mOwnUser_1.add(true);
mUserProfileImg_2.add(R.drawable.boy);
mUserText_3.add(edittext.getText().toString().trim());
adapter.notifyItemInserted(mOwnUser_1.size());
conversationRecyclerView.scrollToPosition(mOwnUser_1.size() - 1);
My Whole Conversation Activity Class:
public class ConversationActivity extends AppCompatActivity {
private static final String TAG = "ConversationActivity";
private EditText editText;
private LinearLayout linearLayout;
private LinearLayoutManager linearLayoutManager;
private ImageView sendBtn;
private ImageView emojiImage;
private View rootView;
private Boolean popUpShown = false;
private Boolean micShown = false;
private ImageView micBtn;
private RelativeLayout micLayout;
private RecyclerView conversationRecyclerView;
// Array Lists for Find USERS
private ArrayList<Boolean> mOwnUser_1 = new ArrayList<>();
private ArrayList<Integer> mUserProfileImg_2 = new ArrayList<>();
private ArrayList<String> mUserText_3 = new ArrayList<>();
private ConversationRecyclerViewAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate: started");
super.onCreate(savedInstanceState);
EmojiManager.install(new TwitterEmojiProvider());
setContentView(R.layout.activity_conversation);
editText = findViewById(R.id.conversationEditText);
linearLayout = findViewById(R.id.optionsOther);
emojiImage = findViewById(R.id.emojiIconOther);
rootView = findViewById(R.id.root_view_conversation);
micBtn = findViewById(R.id.microphoneBtn);
micLayout = findViewById(R.id.microphoneLayout);
conversationRecyclerView = findViewById(R.id.conversation_recyclerView);
sendBtn = findViewById(R.id.sendBtnConversation);
if (!(Build.VERSION.SDK_INT >= 21))
findViewById(R.id.typingConversationLayout).setBackgroundResource(R.drawable.edit_text_conversation_background_below_api);
sendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String msg = editText.getText().toString().trim();
if (TextUtils.isEmpty(msg)) {
editText.setError("Please add a message");
editText.requestFocus();
} else {
Log.d(TAG, "onClick: send Btn ADDED TEXT.. ");
addData(true, R.drawable.boy0, msg);
}
}
});
initConversationArrayList();
}
private void addData(Boolean user, int image, String message) {
mOwnUser_1.add(user);
mUserProfileImg_2.add(image);
mUserText_3.add(message);
editText.setText("");
editText.requestFocus();
adapter.notifyItemInserted(mOwnUser_1.size());
conversationRecyclerView.scrollToPosition(mOwnUser_1.size() - 1);
}
private void initConversationArrayList() {
Log.d(TAG, "initConversationArrayList: created");
mOwnUser_1.add(true);
mUserProfileImg_2.add(R.drawable.boy0);
mUserText_3.add("Hello How are you?");
Log.d(TAG, "initConversationArrayList: completed");
initConversationRecyclerView();
}
private void initConversationRecyclerView() {
Log.d(TAG, "initConversationRecyclerView: started");
linearLayoutManager = new LinearLayoutManager(this);
adapter = new ConversationRecyclerViewAdapter();
conversationRecyclerView.setAdapter(adapter);
conversationRecyclerView.setLayoutManager(linearLayoutManager);
linearLayoutManager.setStackFromEnd(true);
conversationRecyclerView.setHasFixedSize(true);
conversationRecyclerView.setNestedScrollingEnabled(false);
Log.d(TAG, "initConversationRecyclerView: completed");
}

Currently I am also working on chat module, let me show you how am I doing this. I am going to show you in steps.
Step 1: make two separate layout for recyclerview items, one for message that has been sent from your side and one for message received from another side.
Step 2 : make two view holders to populate different layout according to your scenario, made in above step, like this:
public class ChatNewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<Chat> chats;
public ChatNewAdapter(List<Chat> chats) {
this.chats = chats;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == 0) {
View viewSend = (View) LayoutInflater.from(parent.getContext()).inflate(R.layout.item_message_send, parent, false);
return new ViewHolderSend(viewSend);
} else {
View viewReceive = (View) LayoutInflater.from(parent.getContext()).inflate(R.layout.item_message_received, parent, false);
return new ViewHolderReceive(viewReceive);
}
}
#Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
switch (holder.getItemViewType()) {
case 0:
ViewHolderSend viewHolderSend = (ViewHolderSend) holder;
viewHolderSend.messageSend.setText(chats.get(position).getMessage());
break;
case 1:
ViewHolderReceive viewHolderReceive = (ViewHolderReceive) holder;
viewHolderReceive.messageReceived.setText(chats.get(position).getMessage());
break;
}
}
#Override
public int getItemCount() {
return chats.size();
}
#Override
public int getItemViewType(int position) {
if (chats != null && !chats.get(position).fromAdmin) {
return 0;
} else
return 1;
}
class ViewHolderSend extends RecyclerView.ViewHolder {
TextView messageSend;
public ViewHolderSend(View itemView) {
super(itemView);
messageSend = (TextView) itemView.findViewById(R.id.messageSend);
}
}
class ViewHolderReceive extends RecyclerView.ViewHolder {
TextView messageReceived;
public ViewHolderReceive(View itemView) {
super(itemView);
messageReceived = (TextView) itemView.findViewById(R.id.messageReceived);
}
}
public int addMessages(Chat chat) {
chats.add(chat);
notifyDataSetChanged();
return chats.size();
}
Step 3 : now in your activity:
public class Test extends AppCompatActivity {
RecyclerView chatList;
RecyclerView.LayoutManager mLayoutManager;
ChatNewAdapter adapter;
ImageView sendButton;
EditText messageEditText;
boolean keyboardUp = false;
boolean isRunning = false;
ArrayList<Chat> chats;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
isRunning = true;
setUpComponents();
}
public void setUpComponents() {
chatList = (RecyclerView) findViewById(R.id.chat_list);
chatList.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
chatList.setLayoutManager(mLayoutManager);
messageEditText = (EditText) findViewById(R.id.messageText);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
sendButton = (ImageView) findViewById(R.id.send);
adapter = new ChatNewAdapter(chats);
chatList.setAdapter(adapter);
chatList.scrollToPosition(chatList.getAdapter().getItemCount() - 1);
messageEditText.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
if (keyboardShown(messageEditText.getRootView())) {
Log.d("keyboard", "keyboard UP");
if (keyboardUp == false) {
if (chats.size() > 0)
chatList.smoothScrollToPosition(chats.size() + 1);
keyboardUp = true;
}
} else {
Log.d("keyboard", "keyboard Down");
keyboardUp = false;
}
}
});
sendButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final String message = messageEditText.getText().toString().trim();
if (!message.equals("")) {
Chat chat = new Chat();
String name = message;
chat.setMessage(name);
messageEditText.setText("");
adapter.addMessages(chat);
chatList.scrollToPosition(chatList.getAdapter().getItemCount() - 1);
} else {
Log.d("sending message Error", "error fetching dates");
}
}
});
}
private boolean keyboardShown(View rootView) {
final int softKeyboardHeight = 100;
Rect r = new Rect();
rootView.getWindowVisibleDisplayFrame(r);
DisplayMetrics dm = rootView.getResources().getDisplayMetrics();
int heightDiff = rootView.getBottom() - r.bottom;
return heightDiff > softKeyboardHeight * dm.density;
}
And this is my model class, ignore #PrimaryKey and #Required annotation it just because I am using Realm for local DB. In your case you wont required these annotation.
public class Chat extends RealmObject {
#PrimaryKey
#Required
public Long id;
public boolean fromAdmin;
#Required
public String message;
public int type;
public boolean isRead;
public boolean isSent;
public Date date;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public boolean isFromAdmin() {
return fromAdmin;
}
public void setFromAdmin(boolean fromAdmin) {
this.fromAdmin = fromAdmin;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public boolean isRead() {
return isRead;
}
public void setRead(boolean read) {
isRead = read;
}
public boolean isSent() {
return isSent;
}
public void setSent(boolean sent) {
isSent = sent;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
I hope it will be helpful for you, you can ask further if you want to know anything else related to code.

RecyclerView as the name stands recycles the views. When binding data to a view, you need to ensure you set or reset all views that are touched in the adapter. Messups typically occur when there's data that is set only conditionally for some but not all items.
In particular:
if (mOwnUser_1.get(position)) {
holderConversation.receivedMsgLayout.setVisibility(View.GONE);
holderConversation.sentProfileImg.setImageResource(mUserProfileImg_2.get(position));
holderConversation.sentMsg.setText(mUserText_3.get(position));
} else {
holderConversation.sentMsgLayout.setVisibility(View.GONE);
holderConversation.receivedProfileImg.setImageResource(mUserProfileImg_2.get(position));
holderConversation.receivedMsg.setText(mUserText_3.get(position));
}
Both of these branches will need to reset the other layout back to visible.
Anyway with this kind of two-layout approach you are likely better off by having them as separate view types in your adapter. See How to create RecyclerView with multiple view type?

add integer values selected by checkbox

TestListModel.class
public class TestListModel {
private String testlist_id;
private String test_price;
private String test_name;
private boolean isSelected;
public TestListModel(String testlist_id, String test_price, String test_name,boolean isSelected) {
this.testlist_id = testlist_id;
this.test_price = test_price;
this.test_name = test_name;
this.isSelected = isSelected;
}
public String getTestlist_id() {
return testlist_id;
}
public void setTestlist_id(String testlist_id) {
this.testlist_id = testlist_id;
}
public String getTest_price() {
return test_price;
}
public void setTest_price(String test_price) {
this.test_price = test_price;
}
public String getTest_name() {
return test_name;
}
public void setTest_name(String test_name) {
this.test_name = test_name;
}
public boolean isSelected() {
return isSelected;
}
public void setSelected(boolean isSelected) {
this.isSelected = isSelected;
}
}
JsonResponse.java
public class JSONResponse {
private TestListModel[] result;
public TestListModel[] getResult() {
return result;
}
public void setResult(TestListModel[] result) {
this.result = result;
}
}
HealthActivity.java
public class HealthServicesActivity extends AppCompatActivity implements View.OnClickListener {
/*
*Api call
* */
private RecyclerView recyclerView;
private ArrayList<TestListModel> data;
private RecyclerAdapter madapter;
private Button submitButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_health_services);
ButterKnife.bind(this);
sharePreferenceManager = new SharePreferenceManager<>(getApplicationContext());
submitButton=(Button) findViewById(R.id.submit_button);
showcenterid(sharePreferenceManager.getUserLoginData(LoginModel.class));
initViews();
submitButton.setOnClickListener(this);
/*
* On Click Listner
* */
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.submit_button:
int totalAmount = 0;
int totalPrice = 0;
String testName = "";
String testPrice="";
int count = 0;
List<TestListModel> stList = ((RecyclerAdapter) madapter)
.getTestList();
for (int i = 0; i < stList.size(); i++) {
TestListModel singleStudent = stList.get(i);
//AmountCartModel serialNumber = stList.get(i);
if (singleStudent.isSelected() == true) {
testName = testName + "\n" + singleStudent.getTest_name().toString();
testPrice = testPrice+"\n" + singleStudent.getTest_price().toString();
count++;
totalAmount = Integer.parseInt(stList.get(i).getTest_price());
totalPrice = totalPrice + totalAmount;
}
}
Toast.makeText(HealthServicesActivity.this,
"Selected Lists: \n" + testName+ "" + testPrice, Toast.LENGTH_LONG)
.show();
Intent in= new Intent(HealthServicesActivity.this, AmountCartActivity.class);
in.putExtra("test_name", testName);
in.putExtra("test_price", testPrice);
//in.putExtra("total_price",totalPrice);
in.putExtra("total_price", totalPrice);
in.putExtra("serialNumber", count);
startActivity(in);
finish();
break;
/** back Button Click
* */
case R.id.back_to_add_patient:
startActivity(new Intent(getApplicationContext(), PatientActivity.class));
finish();
break;
default:
break;
}
}
/** show center Id in action bar
* */
#Override
protected void onResume() {
super.onResume();
showcenterid(sharePreferenceManager.getUserLoginData(LoginModel.class));
}
private void showcenterid(LoginModel userLoginData) {
centerId.setText(userLoginData.getResult().getGenCenterId());
centerId.setText(userLoginData.getResult().getGenCenterId().toUpperCase());
deviceModeName.setText(userLoginData.getResult().getDeviceModeName());
}
private void initViews() {
recyclerView = (RecyclerView)findViewById(R.id.test_list_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
loadJSON();
}
private void loadJSON() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(" http://192.168.1.80/aoplnew/api/")
//
.baseUrl("https://earthquake.usgs.gov/fdsnws/event/1/query?")
.addConverterFactory(GsonConverterFactory.create())
.build();
ApiInterface request = retrofit.create(ApiInterface.class);
Call<JSONResponse> call = request.getTestLists();
call.enqueue(new Callback<JSONResponse>() {
#Override
public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
JSONResponse jsonResponse = response.body();
data = new ArrayList<>(Arrays.asList(jsonResponse.getResult()));
madapter = new RecyclerAdapter(data);
recyclerView.setAdapter(madapter);
}
#Override
public void onFailure(Call<JSONResponse> call, Throwable t) {
Log.d("Error",t.getMessage());
}
});
}
HealthRecyclerAdapter.java
public class RecyclerAdapter extends
RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private ArrayList<TestListModel> android;
public RecyclerAdapter(ArrayList<TestListModel> android) {
this.android = android;
}
#Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.test_list_row,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(RecyclerAdapter.ViewHolder holder, final int position) {
holder.test_name.setText(android.get(position).getTest_name());
holder.test_price.setText(android.get(position).getTest_price());
holder.chkSelected.setChecked(android.get(position).isSelected());
holder.chkSelected.setTag(android.get(position));
holder.chkSelected.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
TestListModel contact = (TestListModel) cb.getTag();
contact.setSelected(cb.isChecked());
android.get(position).setSelected(cb.isChecked());
Toast.makeText(
v.getContext(),
"Clicked on Checkbox: " + cb.getText() + " is " + cb.isChecked(), Toast.LENGTH_LONG).show();
}
});
}
#Override
public int getItemCount() {
return android.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView test_name;
private TextView test_price;
public CheckBox chkSelected;
public TestListModel testLists;
public ViewHolder(View itemView) {
super(itemView);
test_name = (TextView)itemView.findViewById(R.id.test_name);
test_price = (TextView)itemView.findViewById(R.id.price_name);
chkSelected = (CheckBox) itemView.findViewById(R.id.check_box);
}
}
// method to access in activity after updating selection
public List<TestListModel> getTestList() {
return android;
}
AmountCartModel.java
public class AmountCartModel {
private String testName;
private String testPrice;
private Integer serialNumber;
private Integer totalPrice;
public AmountCartModel() {
this.testName = testName;
this.testPrice = testPrice;
this.serialNumber = serialNumber;
this.totalPrice = totalPrice;
}
public String getTestName() {
return testName;
}
public void setTestName(String testName) {
this.testName = testName;
}
public String getTestPrice() {
return testPrice;
}
public void setTestPrice(String testPrice) {
this.testPrice = testPrice;
}
public Integer getSerialNumber() {
return serialNumber;
}
public void setSerialNumber(Integer serialNumber) {
this.serialNumber = serialNumber;
}
public Integer getTotalPrice() {
return totalPrice;
}
public void setTotalPrice(Integer totalPrice) {
this.totalPrice = totalPrice;
}
}
AmountCartActivity.java
public class AmountCartActivity extends AppCompatActivity implements View.OnClickListener {
#BindView(R.id.total_price)
TextView totalPriceDisplay;
SharePreferenceManager<LoginModel> sharePreferenceManager;
private RecyclerView recyclerView;
List<AmountCartModel> mydataList ;
private MyAdapter madapter;
Bundle extras ;
String testName="";
String testPrice="";
String totalPrice= "";
int counting = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_amount_cart);
ButterKnife.bind(this);
sharePreferenceManager = new SharePreferenceManager<>(getApplicationContext());
showcenterid(sharePreferenceManager.getUserLoginData(LoginModel.class));
mydataList = new ArrayList<>();
/*
* Getting Values From BUNDLE
* */
extras = getIntent().getExtras();
if (extras != null) {
testName = extras.getString("test_name");
testPrice = extras.getString("test_price");
totalPrice = String.valueOf(extras.getInt("total_price"));
counting = extras.getInt("serialNumber");
//Just add your data in list
AmountCartModel mydata = new AmountCartModel(); // object of Model Class
mydata.setTestName(testName );
mydata.setTestPrice(testPrice);
mydata.setTotalPrice(Integer.valueOf(totalPrice));
mydata.setSerialNumber(counting);
mydataList.add(mydata);
//totalPriceDisplay.setText(totalPrice);
}
madapter=new MyAdapter(mydataList);
madapter.setMyDataList(mydataList);
recyclerView = (RecyclerView)findViewById(R.id.recyler_amount_cart);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(madapter);
RecyclerAdapter.java //RecyclerAdapter for AmountCart
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
{
private List<AmountCartModel> context;
private List<AmountCartModel> myDataList;
public MyAdapter(List<AmountCartModel> context) {
this.context = context;
myDataList = new ArrayList<>();
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
// Replace with your layout
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.amount_cart_row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// Set Your Data here to yout Layout Components..
// to get Amount
/* myDataList.get(position).getTestName();
myDataList.get(position).getTestPrice();*/
holder.testName.setText(myDataList.get(position).getTestName());
holder.testPrice.setText(myDataList.get(position).getTestPrice());
holder.textView2.setText(myDataList.get(position).getSerialNumber());
}
#Override
public int getItemCount() {
/*if (myDataList.size() != 0) {
// return Size of List if not empty!
return myDataList.size();
}
return 0;*/
return myDataList.size();
}
public void setMyDataList(List<AmountCartModel> myDataList) {
// getting list from Fragment.
this.myDataList = myDataList;
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView testName,testPrice,textView2;
public ViewHolder(View itemView) {
super(itemView);
// itemView.findViewById
testName=itemView.findViewById(R.id.test_name_one);
testPrice=itemView.findViewById(R.id.test_price);
textView2=itemView.findViewById(R.id.textView2);
}
}
}
#Override
public void onBackPressed() {
super.onBackPressed();
startActivity(new
Intent(AmountCartActivity.this,HealthServicesActivity.class));
finish();
}
}
This is my code.
Here I am taking HealthActivity and in this class by using recycler view I have displayed testList in recycler view. I am passing testList whichever I am selecting through checkbox to AmountCartActivity of recycler View, And, I am calculating total amount of the selected testList and I am getting the result and that result I am passing to the AmountCart Activity through bundle and I am getting correct result in bundle, but, when I am trying to display total amount in a textView its showing me nothing.
And, my second problem is,
I am trying to display serial number to to my AmountCartActivity of recycler view whichever I am selecting from previous HealthCartActivity using checkbox. And, I have implemented some code but I am not getting how to solve it. please help me.

For Issue#1
Data should be passed onto the Adapter through constructor. The issue could simply be adding another parameter to the constructor:
public MyAdapter(List<AmountCartModel> context, List<AmountCartModel> myDataList) {
this.context = context;
myDataList = this.myDataList;
}
Or,
To add selection support to a RecyclerView instance:
Determine which selection key type to use, then build a ItemKeyProvider.
Implement ItemDetailsLookup: it enables the selection library to access information about RecyclerView items given a MotionEvent.
Update item Views in RecyclerView to reflect that the user has selected or unselected it.
The selection library does not provide a default visual decoration for the selected items. You must provide this when you implement onBindViewHolder() like,
In onBindViewHolder(), call setActivated() (not setSelected()) on the View object with true or false (depending on if the item is selected).
Update the styling of the view to represent the activated status.
For Issue #2
Try using passing data through intents.
The easiest way to do this would be to pass the serial num to the activity in the Intent you're using to start the activity:
Intent intent = new Intent(getBaseContext(), HealthServicesActivity.class);
intent.putExtra("EXTRA_SERIAL_NUM", serialNum);
startActivity(intent);
Access that intent on next activity
String sessionId= getIntent().getStringExtra("EXTRA_SERIAL_NUM");

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?