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));
}
}
});
}

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");

My data of recyclerview loss in scroll down

I have a recyclerview and set text some textview in it. when I scroll down or my fragment goes to onPause state my data loss.
what can i do?
import static com.test.mohammaddvi.snappfood.Adapter.SectionListDataAdapter.decodeSampledBitmapFromResource;
public class RecyclerViewMenuFragmentAdapter extends RecyclerView.Adapter<RecyclerViewMenuFragmentAdapter.SingleItemInMenuFragment> {
private ArrayList<Food> foodList;
private Context mContext;
public RecyclerViewMenuFragmentAdapter(ArrayList<Food> foodList, Context mContext) {
this.foodList = foodList;
this.mContext = mContext;
}
#NonNull
#Override
public RecyclerViewMenuFragmentAdapter.SingleItemInMenuFragment onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.foodlist, null);
return new RecyclerViewMenuFragmentAdapter.SingleItemInMenuFragment(v);
}
#Override
public void onBindViewHolder(final RecyclerViewMenuFragmentAdapter.SingleItemInMenuFragment holder, int position) {
Food food = foodList.get(position);
holder.foodName.setText(food.getName());
holder.foodDetails.setText(food.getDetails());
holder.foodPrice.setText(food.getPrice() + " تومان ");
holder.foodOrderNumber.setVisibility(View.INVISIBLE);
holder.foodMinusButton.setVisibility(View.INVISIBLE);
holder.foodOrderNumber.setText(0 + "");
holder.foodImage.setImageBitmap(decodeSampledBitmapFromResource(mContext.getResources(), mContext.getResources().getIdentifier(food.getImage(),
"drawable", mContext.getPackageName()), 50, 50));
handleClick(holder, position);
}
private void handleClick(final SingleItemInMenuFragment holder, final int position) {
holder.foodPlusButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int orderNumber = Integer.parseInt(holder.foodOrderNumber.getText().toString());
holder.foodOrderNumber.setText(orderNumber + 1 + "");
holder.foodOrderNumber.setVisibility(View.VISIBLE);
holder.foodMinusButton.setVisibility(View.VISIBLE);
}
});
holder.foodMinusButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int orderNumber = Integer.parseInt(holder.foodOrderNumber.getText().toString());
if (orderNumber > 1) {
holder.foodOrderNumber.setText(orderNumber - 1 + "");
holder.foodOrderNumber.setVisibility(View.VISIBLE);
}
if (orderNumber == 1) {
holder.foodOrderNumber.setText(orderNumber - 1 + "");
holder.foodOrderNumber.setVisibility(View.INVISIBLE);
holder.foodMinusButton.setVisibility(View.INVISIBLE);
}
}
});
}
#Override
public int getItemCount() {
return (null != foodList ? foodList.size() : 0);
}
public class SingleItemInMenuFragment extends RecyclerView.ViewHolder {
TextView foodName;
TextView foodPrice;
Button foodPlusButton;
Button foodMinusButton;
TextView foodOrderNumber;
ImageView foodImage;
TextView foodDetails;
SingleItemInMenuFragment(View itemView) {
super(itemView);
this.foodName = itemView.findViewById(R.id.foodName);
this.foodImage = itemView.findViewById(R.id.imageFood);
this.foodPrice = itemView.findViewById(R.id.foodPrice);
this.foodDetails = itemView.findViewById(R.id.foodDetails);
this.foodPlusButton = itemView.findViewById(R.id.plusbutton);
this.foodMinusButton = itemView.findViewById(R.id.minusbutton);
this.foodOrderNumber = itemView.findViewById(R.id.ordernumber);
}
}
}
and this is my fragment that i use recyclerview in that:
public class MenuFragment extends Fragment{
private static final String TAG = "menufragment";
ArrayList<Food> allfoods = new ArrayList<>();
RecyclerView recyclerview;
private static Bundle bundle;
private final String KEY_RECYCLER_STATE= "recycler_state";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.menufragment, container, false);
}
#Override
public void onStart() {
super.onStart();
String jsonFilePath = "foods.json";
recyclerview = getActivity().findViewById(R.id.lstitems);
RecyclerViewMenuFragmentAdapter adapter = new RecyclerViewMenuFragmentAdapter(allfoods, getContext());
recyclerview.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false));
recyclerview.setHasFixedSize(true);
recyclerview.setAdapter(adapter);
parsJson(jsonFilePath);
}
//this method is for read a local json and return a string
public String readLocalJson(String jsonFile) {
String json;
try {
InputStream is = getActivity().getAssets().open(jsonFile);
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException e) {
e.printStackTrace();
return null;
}
return json;
}
public void parsJson(String jsonFilePath) {
try {
JSONObject obj = new JSONObject(readLocalJson(jsonFilePath));
JSONArray jsonArray = obj.getJSONArray("results");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String image = jsonObject.getString("image");
JSONArray jsonArrayFoot = jsonObject.getJSONArray("foots");
for (int j = 0; j < jsonArrayFoot.length(); j++) {
JSONObject jsonObjectFoot = jsonArrayFoot.getJSONObject(j);
String foodName = jsonObjectFoot.getString("name");
String fooddetails = jsonObjectFoot.getString("fooddetails");
String price = jsonObjectFoot.getString("price");
allfoods.add(new Food(foodName, price, fooddetails, image));
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}

Basically, you just initialized the data on onStart which will eventually called when your activity/fragment is resumed, and because of that all data you've changed was overwritten to initial data.
Move your onStart initialization to onViewCreated:
#Override
public void onViewCreated() {
super.onViewCreated();
String jsonFilePath = "foods.json";
recyclerview = getActivity().findViewById(R.id.lstitems);
RecyclerViewMenuFragmentAdapter adapter = new RecyclerViewMenuFragmentAdapter(allfoods, getContext());
recyclerview.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false));
recyclerview.setHasFixedSize(true);
recyclerview.setAdapter(adapter);
parsJson(jsonFilePath);
}
And for scrolling, its normal because RecyclerView recycles the view from the list above but the data is not, so what you need to do is store values from the list source.
#Override
public void onBindViewHolder(final RecyclerViewMenuFragmentAdapter.SingleItemInMenuFragment holder, int position) {
Food food = foodList.get(position);
holder.foodName.setText(food.getName());
holder.foodDetails.setText(food.getDetails());
holder.foodPrice.setText(food.getPrice() + " تومان ");
holder.foodOrderNumber.setVisibility(View.INVISIBLE);
holder.foodMinusButton.setVisibility(View.INVISIBLE);
holder.foodOrderNumber.setText(food.getFoodOrderNumber());
holder.foodImage.setImageBitmap(decodeSampledBitmapFromResource(mContext.getResources(), mContext.getResources().getIdentifier(food.getImage(),
"drawable", mContext.getPackageName()), 50, 50));
handleClick(holder, position);
}
private void handleClick(final SingleItemInMenuFragment holder, final int position) {
holder.foodPlusButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int orderNumber = Integer.parseInt(holder.foodOrderNumber.getText().toString());
int newOrderNumber = orderNumber + 1;
Food food = foodList.get(position);
food.setFoodOrderNumber(newOrderNumber);
holder.foodOrderNumber.setText(newOrderNumber + "");
holder.foodOrderNumber.setVisibility(View.VISIBLE);
holder.foodMinusButton.setVisibility(View.VISIBLE);
}
});
holder.foodMinusButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Food food = foodList.get(position);
int orderNumber = food.getFoodOrderNumber();
if (orderNumber > 1) {
int newOrderNumber = orderNumber - 1;
food.setFoodOrderNumber(newOrderNumber);
holder.foodOrderNumber.setText(newOrderNumber + "");
holder.foodOrderNumber.setVisibility(View.VISIBLE);
}
if (orderNumber == 1) {
int newOrderNumber = orderNumber - 1;
food.setFoodOrderNumber(newOrderNumber);
holder.foodOrderNumber.setText(newOrderNumber + "");
holder.foodOrderNumber.setVisibility(View.INVISIBLE);
holder.foodMinusButton.setVisibility(View.INVISIBLE);
}
}
});
}
And on your Food object just add this field and functions:
public class Food {
int foodOrderNumber;
public int getFoodOrderNumber() {
return foodOrderNumber;
}
public void setFoodOrderNumber(int foodOrderNumber) {
this.foodOrderNumber = foodOrderNumber;
}
}

add this line to your onBindViewHolder method and check again if the problem still exits:
holder.setIsRecyclable(false);

RecyclerView notifyDatasetChanged not working

I have a RecyclerView inside a Fragment within Activity. I need to refresh my RecyclerView from Activity. I added a method inside Fragment which called notifyDatasetChanged to refresh RecyclerView. But notifyDatasetChanged didn't work.
Here is my Fragment.
public class CategoryFragment extends Fragment{
private RecyclerView recyclerView;
private EventsAdapter adapter;
static Context context = null;
private List<Category> categories;
private List<Item> allItems = new ArrayList();
private ReminderDatabase dbHandler;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(!checkDatabase()){
copyDatabase();
}
context = getActivity();
dbHandler = new ReminderDatabase(context);
fillAllItems();
}
public void fillAllItems(){
categories = dbHandler.getAllCategory();
for(int i=0;i<categories.size();i++){
Category category = categories.get(i);
Item categoryItem = new Item(category.getTitle(),category.getColor(),Category.CATEGORY_TYPE);
allItems.add(categoryItem);
List<Event> events = dbHandler.getEventsByCategory(category.getTitle());
for(int j=0;j<events.size();j++){
Event e = events.get(j);
Item eventItem = new Item(e.getId(),e.getTitle(),e.getDescription(),e.getPlace(),e.getCategory(),e.getTime(),e.getDate(),categoryItem.getColor(),e.isShow(),Event.EVENT_TYPE);
allItems.add(eventItem);
}
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.category_fragment, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.recyclerView);
adapter = new EventsAdapter(getContext(),allItems);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(adapter);
return v;
}
public boolean checkDatabase(){
String path = "/data/data/com.example.materialdesign.reminder/databases/";
String filename = "Remind";
File file = new File(path+filename);
Log.d("Database","File exists -> "+file.exists());
return file.exists();
}
public void copyDatabase(){
String path = "/data/data/com.example.materialdesign.reminder/databases/Remind";
ReminderDatabase dbHandler = new ReminderDatabase(getContext());
dbHandler.getWritableDatabase();
InputStream fin;
OutputStream fout;
byte[] bytes = new byte[1024];
try {
fin = getActivity().getAssets().open("Remind");
fout = new FileOutputStream(path);
int length=0;
while((length = fin.read(bytes))>0){
fout.write(bytes,0,length);
}
fout.flush();
fout.close();
fin.close();
Log.d("Database","successfully copied database");
} catch (FileNotFoundException e) {
e.printStackTrace();
Log.d("Database","-Error" +e.getMessage());
} catch (IOException e) {
e.printStackTrace();
Log.d("Database","-Error" +e.getMessage());
}
}
#Override
public void onResume() {
super.onResume();
allItems.clear();
Log.d("TAG","onresume");
fillAllItems();
adapter.notifyDataSetChanged();
}
public void refresh(){
Log.d("c",allItems.size()+"");
allItems.clear();
fillAllItems();
Log.d("c",allItems.size()+"");
adapter.notifyDataSetChanged();
}
}
I called refresh method from MainActivity.
#Override
public void onInserted() {
fragment.refresh();
}
My Adapter is here.
public class EventsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
private Context context;
private List<Item> allItems = new ArrayList();
private HideOrShowListener hideOrShowListener;
public static final int EVENT_TYPE = 1;
public static final int CATEGORY_TYPE = 0;
private int lastPosition;
private boolean flag = false;
public EventsAdapter(Context context,List<Item> allItems){
this.context = context;
hideOrShowListener =(HideOrShowListener) context;
this.allItems = allItems;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
switch (viewType){
case CATEGORY_TYPE:
view = LayoutInflater.from(context).inflate(R.layout.category_item,parent,false);
return new CategoryViewHolder(view);
case EVENT_TYPE:
view = LayoutInflater.from(context).inflate(R.layout.events_item,parent,false);
return new EventViewHolder(view);
}
return null;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Item item = allItems.get(position);
switch (item.getType()){
case CATEGORY_TYPE:
((CategoryViewHolder)holder).tvCategoryTitle.setText(item.getTitle());
((GradientDrawable)(((CategoryViewHolder)holder).categoryColorIcon).getBackground()).setColor(Color.parseColor(item.getColor()));
((CategoryViewHolder)holder).imgAddEvent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
hideOrShowListener.setHideOrShow(item,false);
}
});
break;
case EVENT_TYPE:
String[] time = item.getTime().trim().split(":");
int hour = Integer.parseInt(time[0]);
((EventViewHolder)holder).tvEventName.setText(item.getTitle());
((EventViewHolder)holder).tvTime.setText(hour<12?hour+" : "+time[1] +" am" : hour-12+" : "+time[1] +" pm" );
((EventViewHolder)holder).tvPlace.setText(item.getPlace());
if(item.getDescription().length()==0) {
item.setDescription("No Detail");
}
((EventViewHolder)holder).tvDescription.setText(item.getDescription());
if(item.isShow()){
((EventViewHolder)holder).descriptionLayout.animate().alpha(1).setDuration(200).setInterpolator(new AccelerateInterpolator()).start();
((EventViewHolder)holder).descriptionLayout.setVisibility(View.VISIBLE);
((EventViewHolder)holder).descriptionLayout.setSelected(true);
((EventViewHolder)holder).tvEdit.setVisibility(View.VISIBLE);
((EventViewHolder)holder).eventContainer.setSelected(true);
}else{
((EventViewHolder)holder).descriptionLayout.setVisibility(View.GONE);
((EventViewHolder)holder).descriptionLayout.animate().alpha(0).setDuration(500).start();
((EventViewHolder)holder).descriptionLayout.setSelected(false);
((EventViewHolder)holder).eventContainer.setSelected(false);
((EventViewHolder)holder).tvEdit.setVisibility(View.INVISIBLE);
}
((EventViewHolder)holder).tvEdit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
hideOrShowListener.setHideOrShow(item,true);
}
});
break;
}
}
#Override
public int getItemCount() {
Log.d("c",allItems.size()+"");
return allItems.size();
}
#Override
public int getItemViewType(int position) {
if(allItems!=null){
return allItems.get(position).getType();
}
return 0;
}
public class CategoryViewHolder extends RecyclerView.ViewHolder{
private TextView tvCategoryTitle;
private View categoryColorIcon;
private ImageView imgAddEvent;
public CategoryViewHolder(View itemView) {
super(itemView);
tvCategoryTitle = (TextView) itemView.findViewById(R.id.tvCategoryTitle);
categoryColorIcon = itemView.findViewById(R.id.categoryColorIcon);
imgAddEvent = (ImageView) itemView.findViewById(R.id.addEvent);
}
}
public class EventViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private LinearLayout descriptionLayout;
private RelativeLayout eventContainer;
private TextView tvEventName,tvTime,tvPlace,tvDescription,tvEdit;
public EventViewHolder(View itemView) {
super(itemView);
descriptionLayout = (LinearLayout) itemView.findViewById(R.id.descriptionLayout);
eventContainer = (RelativeLayout) itemView.findViewById(R.id.eventContainer);
tvEventName = (TextView) itemView.findViewById(R.id.tvEventName);
tvTime = (TextView) itemView.findViewById(R.id.tvTime);
tvPlace = (TextView) itemView.findViewById(R.id.tvPlace);
tvDescription = (TextView) itemView.findViewById(R.id.tvDescription);
tvEdit = (TextView) itemView.findViewById(R.id.tvEdit);
eventContainer.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if(flag){
allItems.get(lastPosition).setShow(false);
}
allItems.get(getAdapterPosition()).setShow(true);
flag = true;
lastPosition = getAdapterPosition();
notifyDataSetChanged();
}
}
public interface HideOrShowListener{
public void setHideOrShow(Item item , boolean isEdit);
}
}
But when I click home button and reenter my application, my RecyclerView refresh. It means that notifyDatasetChanged in onResume method works. But in my refresh method, it doesn't work. How can I do this?

Are you sure this method is being called :
#Override
public void onInserted() {
fragment.refresh();
}
Make sure that you've a correct instance of the fragment. Or you can simply user interface with the refresh() method and implement it in the fragment.

how to convert base64 to image in recyclerView

I am developing an app in which i am using recyclerView.In that i am calling my service for displaying the data. But my image is in Base64 format. I know how to convert Base64 to image without recyclerview, but i thins i am not getting how to do that. Below is my code for mainactivity
if (null != data && status.getCode() != -101) {
String StringData = "" + data;
try {
JSONArray rootArray = new JSONArray(StringData);
int len = rootArray.length();
for (int i = 0; i < len; ++i) {
JSONObject json = rootArray.optJSONObject(i);
final DataJobs b1 = new DataJobs();
b1.ComapnayName = json.optString("CompanyName");
b1.DegreeName = json.optString("DegreeName");
b1.JobTitle = json.optString("JobTitle");
b1.Eventdate = json.optString("Eventdate");
b1.Comp_Req_Id=json.optInt("COMP_REQ_ID");
String img=json.optString("Image");
byte[] decodedString = Base64.decode(img, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
image.setImageBitmap(decodedByte);
datajobs.add(b1);
}
} catch (JSONException e) {
Toast.makeText(getContext(), e.toString(), Toast.LENGTH_LONG).show();
}
}
}
});
Code for adapter
public class EventsAdapter extends RecyclerView.Adapter<EventsAdapter.MyViewHolder> {
public List<DataJobs> datajobs;
private ClickListener clicklistener = null;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView JobTitle,DegreeName,ComapnayName,EventDate,Comp_Req_Id;
public MyViewHolder(View view){
super(view);
ComapnayName=(TextView) view.findViewById(R.id.ComapnayName);
DegreeName=(TextView) view.findViewById(R.id.DegreeName);
JobTitle=(TextView) view.findViewById(R.id.JobTitle);
EventDate=(TextView) view.findViewById(R.id.Eventdate);
Comp_Req_Id=(TextView) view.findViewById(R.id.Comp_Req_Id);
}
}
public EventsAdapter(List<DataJobs>datajobs){
this.datajobs=datajobs;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.data_list, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
final DataJobs event = datajobs.get(position);
holder.ComapnayName.setText(event.getComapnayName());
holder.DegreeName.setText(event.getDegreeName());
holder.JobTitle.setText(event.getJobTitle());
holder.EventDate.setText(event.getEventdate());
holder.Comp_Req_Id.setText(String.valueOf(event.getComp_Req_Id()));
holder.itemView.setOnClickListener (new View.OnClickListener() {
#Override
public void onClick(View v)
{
int a=event.getComp_Req_Id();
Intent i = new Intent(v.getContext(), SecondActivity.class);
i.putExtra("Comp_Req_Id" , a);
v.getContext().startActivity(i);
//getActivity().finish();
}
});
}
}
code for datajobs:
public class DataJobs {
public String JobTitle,DegreeName,ComapnayName,Eventdate;
int Comp_Req_Id;
public DataJobs()
{
}
public DataJobs(String JobTitle,String PositionName,String ComapnayName,String Eventdate,int Comp_Req_Id)
{
this.JobTitle=JobTitle;
this.DegreeName=PositionName;
this.ComapnayName=ComapnayName;
this.Eventdate=Eventdate;
this.Comp_Req_Id=Comp_Req_Id;
}
public String getJobTitle(){
return JobTitle;
}
public void setJobTitle(String Jobname){
this.JobTitle=JobTitle;
}
public String getDegreeName(){
return DegreeName;
}
public void setDegreeNamee(String DegreeName){
this.DegreeName=DegreeName;
}
public String getComapnayName(){
return ComapnayName;
}
public void setCompanyName(String CompanyName){
this.ComapnayName=CompanyName;
}
public String getEventdate()
{
return Eventdate;
}
public void setEventdate(String Eventdate)
{
this.Eventdate=Eventdate;
}
public int getComp_Req_Id()
{
return Comp_Req_Id;
}
public void setComp_Req_Id(int Comp_Req_Id)
{
this.Comp_Req_Id=Comp_Req_Id;
}
}

You have add a Bitmap or String field to your DataJobs object.
Save the image/base64 string when you create the DataJobs list in the Main.
You can add an ImageView into your holder and pass the Bitmap/String to it. (like you do it with the other values)