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How To Add Multiple Cards Of The Same CardView To A RecyclerView?

Here is a video of what I trying to do and explanation of the issue that I am having. Go to the following link below.
https://file.re/2021/09/12/2021-09-1210-43-21/
Here is the XML, Java, and Manifest Code Video. Go to the following link below.
https://file.re/2021/09/12/2021-09-1211-32-13/
Answer worked, but now I have two new problems. Here is the video link below.
https://file.re/2021/09/12/2021-09-1212-08-04/
I am creating an app that lists CardView layouts to a RecyclerView.
My app will add the CardView layout to the RecyclerView list, but it only lists one. I want it to add multiples of the same CardView when the user clicks on the button to add the card (basically cloning the CardView layout one under the other).
Here is what I have in my Button Click...
ftocConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ArrayList<RecyclerItem> addFahToCelCard = new ArrayList<>();
addFahToCelCard.add(new RecyclerItem());
recyclerView = findViewById(R.id.recycler_item_view);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(MainActivity.this);
recyclerItemAdapter = new RecyclerItemAdapter(addFahToCelCard);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(recyclerItemAdapter);
}
}
});
I've tried putting the ArrayList<RecyclerItem> addFahToCelCard = new ArrayList<>(); under the MainActivity extends AppCompatActivity class just before the onCreate like this...
public class MainActivity extends AppCompatActivity {
final private ArrayList<RecyclerItem> addFahToCelCard = new ArrayList<>();
That didn't work.
If I don't keep ArrayList<RecyclerItem> addFahToCelCard = new ArrayList<>(); in the button click listener, and I add a new CardView it will add a new one behind the original one each time the button is clicked, and if I delete the card it keep popping back up until I delete them all off. How do I fix this the way I want it to behave? I hope this all makes sense.
I appreciate the help!
Here is everything in the java class..
public class MainActivity extends AppCompatActivity {
ArrayList<RecyclerItem> addFahToCelCard;
private Animation fromBottom;
private Animation toBottom;
private Boolean clicked = false;
private RecyclerView recyclerView;
private RecyclerItemAdapter recyclerItemAdapter;
private RecyclerView.LayoutManager layoutManager;
public FloatingActionButton mainConverterMenuFloatBtn;
public TextView chooseConverterLabel, ftocConverterLabelBtn, ftokConverterLabelBtn, ctofConverterLabelBtn, ctokConverterLabelBtn, ktofConverterLabelBtn, ktocConverterLabelBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fromBottom = AnimationUtils.loadAnimation(MainActivity.this, R.anim.from_bottom_animation);
toBottom = AnimationUtils.loadAnimation(MainActivity.this, R.anim.to_bottom_animation);
mainConverterMenuFloatBtn = findViewById(R.id.add_temp_converter_float_btn);
chooseConverterLabel = findViewById(R.id.choose_converter_label);
ftocConverterLabelBtn = findViewById(R.id.add_f_to_c_converter_label_btn);
ftokConverterLabelBtn = findViewById(R.id.add_f_to_k_converter_label_btn);
ctofConverterLabelBtn = findViewById(R.id.add_c_to_f_converter_label_btn);
ctokConverterLabelBtn = findViewById(R.id.add_c_to_k_converter_label_btn);
ktofConverterLabelBtn = findViewById(R.id.add_k_to_f_converter_label_btn);
ktocConverterLabelBtn = findViewById(R.id.add_k_to_c_converter_label_btn);
addFahToCelCard = new ArrayList<>();
recyclerView = findViewById(R.id.recycler_item_view);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(MainActivity.this);
recyclerItemAdapter = new RecyclerItemAdapter(addFahToCelCard);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(recyclerItemAdapter);
mainConverterMenuFloatBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mainConverterMenu();
}
});
ftocConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (clicked) {
addFahToCelCard.add(new RecyclerItem());
recyclerItemAdapter.notifyDataSetChanged();
closeActionButton();
}
}
});
ftokConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (clicked) {
closeActionButton();
}
}
});
ctofConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (clicked) {
closeActionButton();
}
}
});
ctokConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (clicked) {
closeActionButton();
}
}
});
ktofConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (clicked) {
closeActionButton();
}
}
});
ktocConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (clicked) {
closeActionButton();
}
}
});
}
private void addFahToCelCard() {
}
private void mainConverterMenu() {
setVisibility(clicked);
setClickable(clicked);
setAnimation(clicked);
clicked = !clicked;
}
private void setVisibility(Boolean clicked) {
if (!clicked) {
chooseConverterLabel.setVisibility(View.VISIBLE);
ftocConverterLabelBtn.setVisibility(View.VISIBLE);
ftokConverterLabelBtn.setVisibility(View.VISIBLE);
ctofConverterLabelBtn.setVisibility(View.VISIBLE);
ctokConverterLabelBtn.setVisibility(View.VISIBLE);
ktofConverterLabelBtn.setVisibility(View.VISIBLE);
ktocConverterLabelBtn.setVisibility(View.VISIBLE);
} else {
chooseConverterLabel.setVisibility(View.GONE);
ftocConverterLabelBtn.setVisibility(View.GONE);
ftokConverterLabelBtn.setVisibility(View.GONE);
ctofConverterLabelBtn.setVisibility(View.GONE);
ctokConverterLabelBtn.setVisibility(View.GONE);
ktofConverterLabelBtn.setVisibility(View.GONE);
ktocConverterLabelBtn.setVisibility(View.GONE);
}
}
private void setClickable(Boolean clicked) {
if (!clicked) {
chooseConverterLabel.setClickable(true);
ftocConverterLabelBtn.setClickable(true);
ftokConverterLabelBtn.setClickable(true);
ctofConverterLabelBtn.setClickable(true);
ctokConverterLabelBtn.setClickable(true);
ktofConverterLabelBtn.setClickable(true);
ktocConverterLabelBtn.setClickable(true);
} else {
chooseConverterLabel.setClickable(false);
ftocConverterLabelBtn.setClickable(false);
ftokConverterLabelBtn.setClickable(false);
ctofConverterLabelBtn.setClickable(false);
ctokConverterLabelBtn.setClickable(false);
ktofConverterLabelBtn.setClickable(false);
ktocConverterLabelBtn.setClickable(false);
}
}
private void setAnimation(Boolean clicked) {
if (!clicked) {
chooseConverterLabel.startAnimation(fromBottom);
ftocConverterLabelBtn.startAnimation(fromBottom);
ftokConverterLabelBtn.startAnimation(fromBottom);
ctofConverterLabelBtn.startAnimation(fromBottom);
ctokConverterLabelBtn.startAnimation(fromBottom);
ktofConverterLabelBtn.startAnimation(fromBottom);
ktocConverterLabelBtn.startAnimation(fromBottom);
} else {
chooseConverterLabel.startAnimation(toBottom);
ftocConverterLabelBtn.startAnimation(toBottom);
ftokConverterLabelBtn.startAnimation(toBottom);
ctofConverterLabelBtn.startAnimation(toBottom);
ctokConverterLabelBtn.startAnimation(toBottom);
ktofConverterLabelBtn.startAnimation(toBottom);
ktocConverterLabelBtn.startAnimation(toBottom);
}
}
private void closeActionButton() {
setVisibility(clicked);
setClickable(clicked);
setAnimation(clicked);
clicked = !clicked;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.app_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
if (id == R.id.show_hide_float_convert_btn) {
if (mainConverterMenuFloatBtn.isShown()) {
mainConverterMenuFloatBtn.setVisibility(View.GONE);
item.setIcon(R.drawable.ic_baseline_visibility_off_32);
} else if (!mainConverterMenuFloatBtn.isShown()) {
mainConverterMenuFloatBtn.setVisibility(View.VISIBLE);
item.setIcon(R.drawable.ic_baseline_visibility_32);
}
} else if (id == R.id.app_help) {
} else if (id == R.id.tip_developer) {
} else if (id == R.id.premium_features) {
} else if (id == R.id.about_app) {
} else if (id == R.id.exit_app) {
}
return super.onOptionsItemSelected(item);
}
public static class RecyclerItemAdapter extends RecyclerView.Adapter<RecyclerItemAdapter.RecyclerViewHolder> {
public ArrayList<RecyclerItem> recyclerItemList;
public AdapterView.OnItemClickListener recyclerItemListener;
public interface OnItemClickListener {
void onItemClick (int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
recyclerItemListener = (AdapterView.OnItemClickListener) listener;
}
public static class RecyclerViewHolder extends RecyclerView.ViewHolder {
EditText inputFahValueET;
TextView fahtoCelResult;
ImageView tempIconAndConvertBtn;
ImageView deleteCardBtn;
String shortResult, longResult;
public RecyclerViewHolder(#NonNull View itemView, final OnItemClickListener listener) {
super(itemView);
inputFahValueET = itemView.findViewById(R.id.input_fahrenheit_value_to_convert);
fahtoCelResult = itemView.findViewById(R.id.output_result_ftc);
tempIconAndConvertBtn = itemView.findViewById(R.id.temp_icon_convert_btn);
deleteCardBtn = itemView.findViewById(R.id.remove_card);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (listener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position);
}
}
}
});
}
}
public RecyclerItemAdapter(ArrayList<RecyclerItem> rList) {
recyclerItemList = rList;
}
#NonNull
#Override
public RecyclerViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fahrenheit_to_celsius_converter_layout, parent, false);
RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(v, (OnItemClickListener) recyclerItemListener);
return recyclerViewHolder;
}
#Override
public void onBindViewHolder(#NonNull RecyclerViewHolder holder, int position) {
RecyclerItem currentItem = recyclerItemList.get(position);
final String[] result = new String[1];
holder.tempIconAndConvertBtn.setOnClickListener(new View.OnClickListener() {
#SuppressLint("SetTextI18n")
#Override
public void onClick(View view) {
String getIputFahValue = holder.inputFahValueET.getText().toString();
NumberFormat nf = new DecimalFormat("0.000");
if(!getIputFahValue.isEmpty()) {
double d = Double.parseDouble(getIputFahValue);
double dd = d - 32;
double ddd = dd * 5;
double dddd = ddd / 9;
result[0] = Double.toString(dddd);
holder.fahtoCelResult.setText(nf.format(dddd) + "°C");
holder.fahtoCelResult.setVisibility(View.VISIBLE);
holder.shortResult = nf.format(dddd) + "°C";
holder.longResult = getIputFahValue + "°F is " + nf.format(dddd) + "°C";
if (result[0].contains(".0")) {
result[0] = result[0].replace(".0", "");
holder.fahtoCelResult.setText(result[0] + "°C");
holder.fahtoCelResult.setVisibility(View.VISIBLE);
holder.shortResult = result[0] + "°C";
holder.longResult = getIputFahValue + "°F is " + result[0] + "°C";
}else if (result[0].contains(".000")) {
result[0] = result[0].replace(".000", "");
holder.fahtoCelResult.setText(result[0] + "°C");
holder.fahtoCelResult.setVisibility(View.VISIBLE);
holder.shortResult = result[0] + "°C";
holder.longResult = getIputFahValue + "°F is " + result[0] + "°C";
}
}else {
Toast.makeText(view.getContext(), "Fahrenheit Value Field Cannot Be Blank!", Toast.LENGTH_LONG).show();
}
}
});
holder.fahtoCelResult.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View view) {
AlertDialog.Builder adb = new AlertDialog.Builder(view.getContext());
adb.setIcon(R.drawable.ic_baseline_file_copy_32);
adb.setTitle("Copy Result");
adb.setMessage("You can copy the result to your clipboard if you would like. Choose if you want the short or long result copied to your clipboard.\n\nExample of Short and Long Result:\nShort Result: 32°C\nLong Result: 0°F is 32°C");
adb.setPositiveButton("Short", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
ClipboardManager cbm = (ClipboardManager) view.getContext().getSystemService(CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("Copy", holder.shortResult);
cbm.setPrimaryClip(clip);
Toast.makeText(view.getContext(), "Result Copied!", Toast.LENGTH_SHORT).show();
}
});
adb.setNegativeButton("Long", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
ClipboardManager cbm = (ClipboardManager) view.getContext().getSystemService(CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("Copy", holder.longResult);
cbm.setPrimaryClip(clip);
Toast.makeText(view.getContext(), "Result Copied!", Toast.LENGTH_SHORT).show();
}
});
adb.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {}});
adb.create();
adb.show();
return false;
}
});
holder.deleteCardBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
recyclerItemList.remove(position);
notifyItemRemoved(position);
}
});
}
#Override
public int getItemCount() {
return recyclerItemList.size();
}
}
public class RecyclerItem {
public RecyclerItem() {
}
}
}
The recyclerView should be listing the CardViews and also allowing duplicates.

Well, I think you are just using the RecyclerView the wrong way.
In your code snippet, you are initializing the RecyclerView as well as the adapter and all other components every time the user clicks the button.
First of all you will have to create the insert method in the RecyclerItemAdapter class.
RecyclerItemAdapter.java
class RecyclerItemAdapter extends RecyclerView.Adapter<YourViewHolder> {
private ArrayList<RecyclerItem> items;
RecyclerItemAdapter(ArrayList<RecyclerItem> recyclerItems) {
this.items = recyclerItems;
}
//...
public void addItem(RecyclerItem item) {
items.add(item);
notifyDataSetChanged();
}
}
Then, you have ton initialize the RecyclerView only once. The best place to do that is in the onCreate method.
MainActivity.java
public class MainActivity extends AppCompatActivity {
private ArrayList<RecyclerItem> addFahToCelCard;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addFahToCelCard = new ArrayList<>();
setupRecyclerView();
setupClickListener();
}
private void setupRecyclerView() {
recyclerView = findViewById(R.id.recycler_item_view);
recyclerItemAdapter = new RecyclerItemAdapter(addFahToCelCard);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
recyclerView.setAdapter(recyclerItemAdapter);
}
}
Now add your onClickListener which will only add the card to the list.
private void setupClickListener() {
ftocConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
recyclerItemAdapter.addItem(new RecyclerItem());
}
});
}

What is your xml layout for this cardview ? It looks like this cardview is in another layout that has match parent as width and height.
If thats the case items are too big to show.
Okay so try making first reletive layout height = 100dp to match the card view in fahrenheit_to_celsius_converter_layout.xml

well I didn't understand the problem very well but from what I understood here's what you should do :
first you shouldn't be creating a new recycler view on every button click, instead you should put the code that initializes the recycler view in onCreate method that exist in the activity class and just keep a reference to the arraylist that holds the data and the adapter as global variables.
whenever the user clicks the button you should add a new item to the arraylist of data and use adapter.notifyDataItemSetChanged to tell the recycle view to check if there's any change happened to the recycle view and take action if necessary
here's a part of code that explains what I'm saying and I hope you that even if that doesn't answer your question, you catch a glimpse of how to deal with recyclerview :
first as I said you should keep a reference to the arraylist that holds the data and the adapter as global variables so put those outside any method in the activity
RecyclerItemAdapter recyclerItemAdapter ;
ArrayList <RecyclerItem>addFahToCelCard ;
and then put this code instead of the button code
addFahToCelCard = new ArrayList<>();
recyclerView = findViewById(R.id.recycler_item_view);
layoutManager = new LinearLayoutManager(MainActivity.this);
recyclerItemAdapter = new RecyclerItemAdapter(addFahToCelCard);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(recyclerItemAdapter);
ftocConverterLabelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
addFahToCelCard.add(new RecyclerItem());
recyclerItemAdapter.notifyDataSetChanged();
}
}
});
that way whenever you want to edit the recyclerView data anytime you can add/remove items from the global arraylist and notify the adapter just like the code inside the button OnClickListener
update to the last video posted about the exception
this problem raises when you delete some items, try to use holder.getAbsoluteAdapterPosition(), instead of getAdapterPosition or the old final position value.
whenever you use a value inside a listener I guess it takes the value that exists right now and hold it as final, so if you have 5 items and deleted the first 3, the last two will still have their position stored as 4 and 5 instead of 1 and 2, thats why you should call the holder.getAbsoluteAdapterPosition() to get the current position instead of the final stored one, that way he stores the holder as final instead of storing a const int value.

Like hitting counter in recyclerview

How to implement like button hitting count in RecyclerView. I have already created a like button and counter TextView with this code but when I hit the like button the application crashes. This is my code, what's wrong? I am using toggle button for like option and a TextView for counting like hitting.
This is my viewholder
public class WritingsViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView MainTitle;
public ImageView Mainimage;
public ImageView Profimage;
public TextView ProfName;
public TextView txv;
public ToggleButton liketglbtn;
public TextView MainDesc, Idvkanme;
private ItemClickListner itemClickListner;
public void setItemClickListner(ItemClickListner itemClickListner) {
this.itemClickListner = itemClickListner;
}
public WritingsViewHolder(View itemView) {
super(itemView);
MainTitle = (TextView)itemView.findViewById(R.id.RTitle);
Mainimage = (ImageView)itemView.findViewById(R.id.rImageView);
Profimage = (ImageView)itemView.findViewById(R.id.Profile_Image);
ProfName = (TextView)itemView.findViewById(R.id.Prof_Name);
MainDesc = (TextView)itemView.findViewById(R.id.rDescriptionTv);
Idvkanme = (TextView)itemView.findViewById(R.id.Idavaka_Name);
txv = (TextView)itemView.findViewById(R.id.tx);
liketglbtn = (ToggleButton) itemView.findViewById(R.id.likeToggleBtn);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
itemClickListner.onClick(v,getAdapterPosition(),false);
}
}
This is my activity
public class WritingsActivity extends AppCompatActivity {
RecyclerView recyclerView;
FirebaseRecyclerOptions<IdavakaModel> options;
FirebaseRecyclerAdapter<IdavakaModel, WritingsViewHolder> adapter;
DatabaseReference MCC;
String categoryId = "";
RecyclerView.LayoutManager layoutManager;
TextView smsCountText;
int pendingSMSCount = 10;
static Button notifCount;
static int mNotifCount = 0;
Button FBcard, YoutubeCard;
private static final String APP_ID = "ca-app-pub-8867939169855032~9998384849";
Button mSaveBtn, mShareBtn;
private long backPressedTime;
private Toast backToast;
private int mCounter = 0;
ToggleButton btn;
TextView txv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_writings);
FBcard = (Button) findViewById(R.id.button1);
FBcard.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent toy = new Intent(WritingsActivity.this, IdavakaNewsUploadActivity.class);
startActivity(toy);
WritingsActivity.this.finish();
}
});
MobileAds.initialize(this,APP_ID);
AdView adView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);
//Bottom Navigation Bar
final BottomNavigationView bottomNavigationView = (BottomNavigationView)findViewById(R.id.botmnavigation);
bottomNavigationView.setSelectedItemId(R.id.action_privacy);
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
switch (menuItem.getItemId()){
case R.id.myhome:
startActivity(new Intent(getApplicationContext(),MainActivity.class));
overridePendingTransition(0,0);
return true;
case R.id.action_notification:
startActivity(new Intent(getApplicationContext(),ChristianNewsMainActivity.class));
overridePendingTransition(0,0);
return true;
case R.id.action_privacy:
return true;
}
return false;
}
});
MCC= FirebaseDatabase.getInstance().getReference().child("Writings");
recyclerView = (RecyclerView) findViewById(R.id.readingroom_recyclerView);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(linearLayoutManager);
LoadData(categoryId);
}
private void LoadData(String categoryId) {
options = new FirebaseRecyclerOptions.Builder<IdavakaModel>().setQuery(MCC,IdavakaModel.class).build();
adapter = new FirebaseRecyclerAdapter<IdavakaModel, WritingsViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull WritingsViewHolder writingsViewHolder, int i, #NonNull IdavakaModel idavakaModel) {
writingsViewHolder.MainTitle.setText(idavakaModel.getTitle());
writingsViewHolder.MainDesc.setText(idavakaModel.getDesc());
writingsViewHolder.ProfName.setText(idavakaModel.getProfname());
writingsViewHolder.Idvkanme.setText(idavakaModel.getIdavakaname());
Picasso.get().load(idavakaModel.getPostimage())
.into(writingsViewHolder.Mainimage);
Picasso.get().load(idavakaModel.getProfimage())
.into(writingsViewHolder.Profimage);
writingsViewHolder.setItemClickListner(new ItemClickListner() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent detailsIntent = new Intent(WritingsActivity.this, IdavakaDetailActivity.class);
detailsIntent.putExtra("CategoryId", adapter.getRef(position).getKey());
startActivity(detailsIntent);
}
});
writingsViewHolder.liketglbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mCounter++;
txv.setText(Integer.toString(mCounter));
}
});
}
#NonNull
#Override
public WritingsViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.writngs_items, parent, false);
return new WritingsViewHolder(v);
}
};
adapter.startListening();
recyclerView.setAdapter(adapter);
}
#Override
public void onBackPressed() {
if (backPressedTime + 2000 > System.currentTimeMillis()) {
backToast.cancel();
super.onBackPressed();
WritingsActivity.this.finish();
return;
} else {
backToast = Toast.makeText(getBaseContext(), "See You Soon", Toast.LENGTH_SHORT);
backToast.show();
}
backPressedTime = System.currentTimeMillis();
WritingsActivity.this.finish();
}
public void onCustomToggleClick (View view) {
Toast.makeText(this, "Liked",Toast.LENGTH_SHORT).show();
}
}

You are getting NullPointerException because the TextView you are using is in Activity named txv where you are setting counter. But the problem is you have declared TextView in Activity but have not initialized anywhere in the Activity. You MUST initialize that variable via findViewbyId method before setting values.
Furthermore, you have initialized txv TextView and accessing on Activity that is why you are getting NLP. TextView is a part of Activity layout which you have not Initialized. On the hand you have initialized txv in Adapter which is of no use.

Method used alongside OnCreate() to update an activity?

I have an android studio activity that contains a RecyclerView, Adapter, and an invisible button at the bottom of the activity. Each itemView thats inside the RecyclerView also has a CheckBox. Inside my Adapter Class I have my Checkbox initialized and has something like - if checkbox.isChecked - then make public static int num = 1 else num = 2; This static variable is then sent to my Activity_main where my bottom button that I need to become Visible can be visible using an if statement that says - if Adapter.num == 1 then button.MakeVisible(true);
Issue is that it's in my Oncreate which is only called once the activity is made. The static number is sent no problem but the activity doesn't update to actually show this. I have to restart the activity to have the button actually become visible.
Adapter Class
public static int p = 0;
#Override
public void onBindViewHolder(#NonNull final Adapter.CustomViewHolder holder,
final int position) {
addedCars = new ArrayList<>();
holder.car.setText(mCars.get(position).getCarName());
holder.mCheckBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(holder.mCheckBox.isChecked()){
Log.d("tag1", "checked");
addedCars.add(mCars.get(position));
String x = Integer.toString(addedCars.size());
Log.d("tag1", x );
p = 1;
holder.mButton2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
}
else {
Log.d("tag1", "unchecked");
addedCars.remove(mCars.get(position));
p = 2;
}
}
});
}
Activity_Main Class
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
Adapter mAdapter;
RecyclerView.LayoutManager mLayoutManager;
Button mButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.RecyclerView);
mButton = findViewById(R.id.button);
ArrayList<Car> cars = new ArrayList<>();
cars.add(new Car("Toyota"));
cars.add(new Car("Ford"));
cars.add(new Car("Tesla"));
mAdapter = new Adapter(cars);
mRecyclerView.setAdapter(mAdapter);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setHasFixedSize(true);
if (mAdapter.p == 1){
mButton.setVisibility(View.VISIBLE);
}
}
}

If you want to send the num p from RecyclerView Adapter to the activity you need an interface to do so following steps to be followed :
have tested my code in android hope this works for you
creating an interface in the adapter
// create an instance of OnItemChangeListener
public OnItemChangeListener onItemChangeListener;
public interface OnItemChangeListener {
void onItemChanged(int p);
}
//set the instance of onItemChangeListener from the main activity
public void setOnItemChangeListener(OnItemChangeListener onItemChangeListener) {
this.onItemChangeListener = onItemChangeListener;
}
holder.mCheckBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(holder.mCheckBox.isChecked()){
Log.d("tag1", "checked");
addedCars.add(mCars.get(position));
String x = Integer.toString(addedCars.size());
Log.d("tag1", x );
p = 1;
/*
* notify updated value using call back
*/
onItemChangeListener.onItemChanged(p);
holder.mButton2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
}
2 finally notify update to the main activity
mAdapter = new Adapter(cars);
mAdapter.setOnItemChangeListener(new /*your adapter name */.OnItemChangeListener() {
#Override
public void onItemChanged(int p) {
// here you will get the latest updated value of p
// now you can update you view accordingly
}
});
mRecyclerView.setAdapter(mAdapter);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setHasFixedSize(true);

Setting the dataset for Recyclerview after filter

I am filtering my data using onQueryTextChange, the list filters but it still shows the old data set(unfiltered) which results in data from the old list, even though it shows the new filtered list.
Can someone fix my code which will display the right data set after filter, and unfiltered dataset when the a user will clear the search text.
I will explain it better with screenshots.
Before filter Screenshot 1, clicking on a item will toast the text on it.
After Filter Screenshot 2, on click it is supposed to say HDFC BANK, instead it still shows the data from Position 1 from the unfiltered data set.
I was told its because I am using the BankNames List (unfiltered) text at position when clicking, because of which this is happening.
Can someone please fix my logic here, I am unable to figure this out, even though it seems simple, I am new to Android.
MainActivity.java
public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener
{
List<DataAdapter> DataAdapterClassList;
RecyclerView recyclerView;
final List<DataAdapter> filteredModelList = new ArrayList<>();
RecyclerView.LayoutManager recyclerViewlayoutManager;
RecyclerViewAdapter recyclerViewadapter;
ProgressBar progressBar;
JsonArrayRequest jsonArrayRequest;
ArrayList<String> BankNames;
RequestQueue requestQueue;
String HTTP_SERVER_URL = "http://hiddenforsecurity.com";
View ChildView;
int RecyclerViewClickedItemPOS;
LinearLayout lyt, icicBtn, hdfcBtn, axisBtn, sbiBtn, pnbBtn, yesBtn;
private static int firstVisibleInListview;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DataAdapterClassList = new ArrayList<>();
BankNames = new ArrayList<>();
recyclerView = (RecyclerView) findViewById(R.id.recyclerView1);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
recyclerView.setHasFixedSize(true);
recyclerViewlayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(recyclerViewlayoutManager);
lyt = (LinearLayout) findViewById(R.id.Layout1);
final Intent go = new Intent(MainActivity.this, StateList.class);
icicBtn = (LinearLayout) findViewById(R.id.icicBtn);
hdfcBtn = (LinearLayout) findViewById(R.id.hdfcBtn);
axisBtn = (LinearLayout) findViewById(R.id.axisBtn);
sbiBtn = (LinearLayout) findViewById(R.id.sbiBtn);
pnbBtn = (LinearLayout) findViewById(R.id.pnbBtn);
yesBtn = (LinearLayout) findViewById(R.id.yesBtn);
final Intent i = new Intent(this, StateList.class);
// JSON data web call function call from here.
JSON_WEB_CALL();
//RecyclerView Item click listener code starts from here.
recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
GestureDetector gestureDetector = new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent motionEvent) {
return true;
}
});
#Override
public boolean onInterceptTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {
ChildView = Recyclerview.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
if (ChildView != null && gestureDetector.onTouchEvent(motionEvent)) {
//Getting RecyclerView Clicked item value.
RecyclerViewClickedItemPOS = Recyclerview.getChildAdapterPosition(ChildView);
Toast.makeText(MainActivity.this, BankNames.get(RecyclerViewClickedItemPOS), Toast.LENGTH_SHORT).show();
//Printing RecyclerView Clicked item clicked value using Toast Message.
//i.putExtra("selectedbank", BankNames.get(RecyclerViewClickedItemPOS));
//startActivity(i);
}
return false;
}
#Override
public void onTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
icicBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "ICICI BANK LIMITED");
startActivity(go);
}
});
axisBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "AXIS BANK");
startActivity(go);
}
});
hdfcBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "HDFC BANK");
startActivity(go);
}
});
sbiBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "STATE BANK OF INDIA");
startActivity(go);
}
});
pnbBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "PUNJAB NATIONAL BANK");
startActivity(go);
}
});
yesBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "YES BANK");
startActivity(go);
}
});
}
public void JSON_WEB_CALL(){
progressBar.setVisibility(View.VISIBLE);
jsonArrayRequest = new JsonArrayRequest(HTTP_SERVER_URL,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
JSON_PARSE_DATA_AFTER_WEBCALL(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
public void JSON_PARSE_DATA_AFTER_WEBCALL(JSONArray array){
for(int i = 0; i<array.length(); i++) {
DataAdapter GetDataAdapter2 = new DataAdapter();
JSONObject json = null;
try {
json = array.getJSONObject(i);
GetDataAdapter2.setBankName(json.getString("BANK"));
//Adding subject name here to show on click event.
BankNames.add(json.getString("BANK"));
}
catch (JSONException e)
{
e.printStackTrace();
}
DataAdapterClassList.add(GetDataAdapter2);
}
progressBar.setVisibility(View.GONE);
recyclerViewadapter = new RecyclerViewAdapter(DataAdapterClassList, this);
recyclerView.setAdapter(recyclerViewadapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_search, menu);
MenuItem item = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
final List<DataAdapter> filteredModelList = filter(DataAdapterClassList, newText);
if (filteredModelList.size() > 0) {
recyclerViewadapter.setFilter(filteredModelList);
return true;
} else {
Toast.makeText(MainActivity.this, "Not Found", Toast.LENGTH_SHORT).show();
return false;
}
}
private List<DataAdapter> filter(List<DataAdapter> models, String query) {
query = query.toLowerCase();
final List<DataAdapter> filteredModelList = new ArrayList<>();
for (DataAdapter model : models) {
final String text = model.getBankName().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
recyclerViewadapter = new RecyclerViewAdapter(filteredModelList, MainActivity.this);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
recyclerView.setAdapter(recyclerViewadapter);
recyclerViewadapter.notifyDataSetChanged();
return filteredModelList;
}
}
RecyclerviewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
Context context;
public DataAdapter dataAdapter;
List<DataAdapter> dataAdapters;
public RecyclerViewAdapter(List<DataAdapter> getDataAdapter, Context context){
super();
this.dataAdapters = getDataAdapter;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
dataAdapter = dataAdapters.get(position);
viewHolder.TextViewName.setText(dataAdapter.getBankName());
}
#Override
public int getItemCount() {
return dataAdapters.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView TextViewName;
public ViewHolder(View itemView) {
super(itemView);
TextViewName = (TextView) itemView.findViewById(R.id.TextViewCard) ;
}
}
public void setFilter(List<DataAdapter> bankNames) {
dataAdapters = new ArrayList<>();
dataAdapters.addAll(bankNames);
notifyDataSetChanged();
}
}

Make global variable for filteredList and take data from that list. The error happened because you are toasting from the full list. Not filteredList

Try this
may this issue that your are Printing Toast of BankNames.get(RecyclerViewClickedItemPOS) from your Oldlist not From the filteredModelList
Remove this
//Getting RecyclerView Clicked item value.
RecyclerViewClickedItemPOS = Recyclerview.getChildAdapterPosition(ChildView);
Toast.makeText(MainActivity.this, BankNames.get(RecyclerViewClickedItemPOS), Toast.LENGTH_SHORT).show();
and set Toast in Adapter class
viewHolder.TextViewName..setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, dataAdapter.getBankName(), Toast.LENGTH_SHORT).show();
}
});

Recyclerview filter picks previous element data after Filteres

I am filtering my recyclerview data with onQueryTextChange method, the filter is working fine, however when I am clicking on a element after filter, it still picks up the element that was placed before the filter. Could some one point me out what I am doing wrong here.
MainActivity.java
public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener
{
List<DataAdapter> DataAdapterClassList;
RecyclerView recyclerView;
EditText etSearch;
RecyclerView.LayoutManager recyclerViewlayoutManager;
RecyclerViewAdapter recyclerViewadapter;
ProgressBar progressBar;
JsonArrayRequest jsonArrayRequest;
ArrayList<String> BankNames;
RequestQueue requestQueue;
String HTTP_SERVER_URL = "http://hiddenforsecurity.com?method=apiTest";
View ChildView;
int RecyclerViewClickedItemPOS;
LinearLayout lyt, icicBtn, hdfcBtn, axisBtn, sbiBtn, pnbBtn, yesBtn;
private static int firstVisibleInListview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DataAdapterClassList = new ArrayList<>();
BankNames = new ArrayList<>();
recyclerView = (RecyclerView) findViewById(R.id.recyclerView1);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
recyclerView.setHasFixedSize(true);
recyclerViewlayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(recyclerViewlayoutManager);
lyt = (LinearLayout) findViewById(R.id.Layout1);
final Intent go = new Intent(MainActivity.this, StateList.class);
icicBtn = (LinearLayout) findViewById(R.id.icicBtn);
hdfcBtn = (LinearLayout) findViewById(R.id.hdfcBtn);
axisBtn = (LinearLayout) findViewById(R.id.axisBtn);
sbiBtn = (LinearLayout) findViewById(R.id.sbiBtn);
pnbBtn = (LinearLayout) findViewById(R.id.pnbBtn);
yesBtn = (LinearLayout) findViewById(R.id.yesBtn);
final Intent i = new Intent(this, StateList.class);
// JSON data web call function call from here.
JSON_WEB_CALL();
//RecyclerView Item click listener code starts from here.
recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
GestureDetector gestureDetector = new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {
#Override
public boolean onSingleTapUp(MotionEvent motionEvent) {
return true;
}
});
#Override
public boolean onInterceptTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {
ChildView = Recyclerview.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
if (ChildView != null && gestureDetector.onTouchEvent(motionEvent)) {
//Getting RecyclerView Clicked item value.
RecyclerViewClickedItemPOS = Recyclerview.getChildAdapterPosition(ChildView);
Toast.makeText(MainActivity.this, BankNames.get(RecyclerViewClickedItemPOS), Toast.LENGTH_SHORT).show();
//Printing RecyclerView Clicked item clicked value using Toast Message.
//i.putExtra("selectedbank", BankNames.get(RecyclerViewClickedItemPOS));
//startActivity(i);
}
return false;
}
#Override
public void onTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
icicBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "ICICI BANK LIMITED");
startActivity(go);
}
});
axisBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "AXIS BANK");
startActivity(go);
}
});
hdfcBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "HDFC BANK");
startActivity(go);
}
});
sbiBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "STATE BANK OF INDIA");
startActivity(go);
}
});
pnbBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "PUNJAB NATIONAL BANK");
startActivity(go);
}
});
yesBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
go.putExtra("selectedbank", "YES BANK");
startActivity(go);
}
});
}
public void JSON_WEB_CALL(){
progressBar.setVisibility(View.VISIBLE);
jsonArrayRequest = new JsonArrayRequest(HTTP_SERVER_URL,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
JSON_PARSE_DATA_AFTER_WEBCALL(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
public void JSON_PARSE_DATA_AFTER_WEBCALL(JSONArray array){
for(int i = 0; i<array.length(); i++) {
DataAdapter GetDataAdapter2 = new DataAdapter();
JSONObject json = null;
try {
json = array.getJSONObject(i);
GetDataAdapter2.setBankName(json.getString("BANK"));
//Adding subject name here to show on click event.
BankNames.add(json.getString("BANK"));
}
catch (JSONException e)
{
e.printStackTrace();
}
DataAdapterClassList.add(GetDataAdapter2);
}
progressBar.setVisibility(View.GONE);
recyclerViewadapter = new RecyclerViewAdapter(DataAdapterClassList, this);
recyclerView.setAdapter(recyclerViewadapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_search, menu);
MenuItem item = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
final List<DataAdapter> filteredModelList = filter(DataAdapterClassList, newText);
if (filteredModelList.size() > 0) {
recyclerViewadapter.setFilter(filteredModelList);
return true;
} else {
Toast.makeText(MainActivity.this, "Not Found", Toast.LENGTH_SHORT).show();
return false;
}
}
private List<DataAdapter> filter(List<DataAdapter> models, String query) {
query = query.toLowerCase();
final List<DataAdapter> filteredModelList = new ArrayList<>();
for (DataAdapter model : models) {
final String text = model.getBankName().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
recyclerViewadapter = new RecyclerViewAdapter(filteredModelList, MainActivity.this);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
recyclerView.setAdapter(recyclerViewadapter);
recyclerViewadapter.notifyDataSetChanged();
return filteredModelList;
}
}
RecyclerviewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
Context context;
public DataAdapter dataAdapter;
List<DataAdapter> dataAdapters;
public RecyclerViewAdapter(List<DataAdapter> getDataAdapter, Context context){
super();
this.dataAdapters = getDataAdapter;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
dataAdapter = dataAdapters.get(position);
viewHolder.TextViewName.setText(dataAdapter.getBankName());
}
#Override
public int getItemCount() {
return dataAdapters.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView TextViewName;
public ViewHolder(View itemView) {
super(itemView);
TextViewName = (TextView) itemView.findViewById(R.id.TextViewCard) ;
}
}
public void setFilter(List<DataAdapter> bankNames) {
dataAdapters = new ArrayList<>();
dataAdapters.addAll(bankNames);
notifyDataSetChanged();
}
}
Please have a look at these screenshot for better understanding of my query.
When I click on a item before filter, Toast displays correct data.
Unfiltered Screenshot
When I click on a item after filtering, Toast still displays the data from the above screenshot, where as it was supposed to show HDFC BANK.Filtered Screenshot

Its because you are changing dataset in list view but later on in Toast you reffer to BankNames which is different dataset.
In your example list has ony 1 element due to filters. While you click it, clicked index will be in fact 0, not x as you would require and later on you are picking 0 indexed bank from BankNames not from filtered result set.
To get things right, use the same dataset for list view and data fetch.
You can do that, by simply creating filteredBankNames collection that will contain currently filtered results, and pass that to your list view. In the same time, in on click event, pick bank name from filteredBankNames as well insteed of BankNames
So for example:
// make this not final local variable, but a field in activity so you can remember filtered items
final List<DataAdapter> filteredModelList = filter(DataAdapterClassList, newText);
if (filteredModelList.size() > 0) {
recyclerViewadapter.setFilter(filteredModelList);
return true;
} else {
and with Toast
Toast.makeText(MainActivity.this, filteredModelList.get(RecyclerViewClickedItemPOS), Toast.LENGTH_SHORT).show();