RecyclerView and Item Position and click on particular item - android-recyclerview

Question

This is the interface of my application, my question is, if I click on "video lecture" then it should go to Video Lecture Activity and if i click on "Detail Notes" then it should go in Detail Notes Activity. Similarly, i want to do with all recyclerView items.
This is my Adapter code
package com.example.motionofknowledge;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.motionofknowledge.databinding.ActivityMaterialsBinding;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.EventListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.FirebaseFirestoreException;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
public class Materials extends AppCompatActivity {
ActivityMaterialsBinding binding;
FirebaseFirestore database;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMaterialsBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
getSupportActionBar().hide();
String head = getIntent().getStringExtra("subName");
TextView textView = findViewById(R.id.headingMat);
textView.setText(new String(head));
database = FirebaseFirestore.getInstance();
ArrayList<MatModel> materials = new ArrayList<>();
MatAdapter adapter = new MatAdapter(this,materials);
String subId = getIntent().getStringExtra("subId");
database.collection("subjects")
.document(subId)
.collection("mat")
.orderBy("index")
.addSnapshotListener(new EventListener<QuerySnapshot>() {
#Override
public void onEvent(#Nullable QuerySnapshot value, #Nullable FirebaseFirestoreException error) {
materials.clear();
for (DocumentSnapshot snapshot:value.getDocuments()){
MatModel model = snapshot.toObject(MatModel.class);
model.setMatId(snapshot.getId());
materials.add(model);
}
adapter.notifyDataSetChanged();
}
});
binding.matList.setLayoutManager(new GridLayoutManager(this,2));
binding.matList.setAdapter(adapter);
binding.matHome.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(Materials.this,MainActivity.class);
startActivity(intent);
}
});
}
}
This is my adapter code
package com.example.motionofknowledge;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
public class MatAdapter extends RecyclerView.Adapter<MatAdapter.MatViewHolder>{
Context context;
ArrayList<MatModel> matModels;
public MatAdapter(Context context, ArrayList<MatModel> matModels){
this.context = context;
this.matModels = matModels;
}
#NonNull
#Override
public MatViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.item_category,null);
return new MatViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MatViewHolder holder, int position) {
MatModel model = matModels.get(position);
holder.textView.setText(model.getMatName());
Glide.with(context)
.load(model.getMatImage())
.into(holder.imageView);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(context,Chapters.class);
intent.putExtra("matId",model.getMatId());
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return matModels.size();
}
public class MatViewHolder extends RecyclerView.ViewHolder{
ImageView imageView;
TextView textView;
public MatViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.image);
textView = itemView.findViewById(R.id.category);
}
}
}

Answer 1

You did not post your adapter code, but your activity code. Anyway: I understand that you have a recyclerView with different kind of items in it (Video Lecture, Detail Notes, and more). Depending on which item the user clicks, you want to do different things.
This is done by using the onBindViewHolder method in your MatAdapter. This method does not only bind the data to the UI layout, but it should also be used to bind a click listener to the UI layout.
If you have only a few items in your RecyclerView, you could use the getItem(position) method of your adapter to find out what specific item you are dealing with within onBindViewHolder. As soon as you know what kind of item the Adapter wants to bind, you can set the according click listener.
See this suggestion:
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = null
if (model.type == VIDEO) {
intent = new Intent(context,Video.class);
} else if (model.type == DETAILS) {
intent = new Intent(context,Details.class);
} else {
...
}
intent.putExtra("matId",model.getMatId());
context.startActivity(intent);
}
});
model is the current MatModel that you want to bind.
model.type is any way to distinguish the different items. I do not know the details of the MatModel class, but you somehow need to be able to distinguish the different models, of course.