How to Create Google Lens Application in Android?

package org.geeksforgeeks.demo;

public class DataModel {
    private String title;
    private String link;
    private String displayedLink;
    private String snippet;

    // Constructor
    public DataModel(String title, String link, String displayedLink, String snippet) {
        this.title = title;
        this.link = link;
        this.displayedLink = displayedLink;
        this.snippet = snippet;
    }

    // Getters and Setters
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public String getDisplayedLink() {
        return displayedLink;
    }

    public void setDisplayedLink(String displayedLink) {
        this.displayedLink = displayedLink;
    }

    public String getSnippet() {
        return snippet;
    }

    public void setSnippet(String snippet) {
        this.snippet = snippet;
    }
}

package org.geeksforgeeks.demo;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {

    private final ArrayList<DataModel> list;
    private final Context context;

    public Adapter(ArrayList<DataModel> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.search_result_rv_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        DataModel modal = list.get(position);
        holder.titleTV.setText(modal.getTitle());
        holder.snippetTV.setText(modal.getDisplayedLink());
        holder.descTV.setText(modal.getSnippet());

        // Open link in browser when item is clicked
        holder.itemView.setOnClickListener(v -> {
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(modal.getLink()));
            context.startActivity(intent);
        });
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    // ViewHolder to hold item views
    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView titleTV, descTV, snippetTV;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            titleTV = itemView.findViewById(R.id.idTVTitle);
            descTV = itemView.findViewById(R.id.idTVDescription);
            snippetTV = itemView.findViewById(R.id.idTVSnippet);
        }
    }
}

package org.geeksforgeeks.demo;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.Toast;
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import com.android.volley.Request;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.bumptech.glide.Glide;
import com.google.mlkit.vision.common.InputImage;
import com.google.mlkit.vision.label.ImageLabel;
import com.google.mlkit.vision.label.ImageLabeling;
import com.google.mlkit.vision.label.defaults.ImageLabelerOptions;
import org.geeksforgeeks.demo.databinding.ActivityMainBinding;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private Bitmap imageBitmap;
    private Adapter adapter;
    private ArrayList<DataModel> dataModalArrayList = new ArrayList<>();
    private String title, link, displayedLink, snippet;
    private ActivityResultLauncher<Intent> takeImageLauncher;

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        // Set up RecyclerView
        binding.recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        adapter = new Adapter(dataModalArrayList, this);

        // Button to capture an image
        binding.snap.setOnClickListener(v -> dispatchTakePictureIntent());

        // Button to process image and fetch search results
        binding.getSearchResults.setOnClickListener(v -> processImage());

        // Register image capture activity result launcher
        takeImageLauncher = registerForActivityResult(
                new ActivityResultContracts.StartActivityForResult(),
                this::handleImageCaptureResult
        );
    }

    // Handle image capture result
    private void handleImageCaptureResult(ActivityResult result) {
        if (result.getResultCode() == RESULT_OK) {
            Intent data = result.getData();
            if (data != null && data.getExtras() != null) {
                imageBitmap = (Bitmap) data.getExtras().get("data");
                Glide.with(this).load(imageBitmap).into(binding.image); // Display captured image
            }
        }
    }

    // Process captured image and fetch search results
    private void processImage() {
        dataModalArrayList.clear();

        if (imageBitmap == null) {
            Toast.makeText(this, "No image found. Please capture an image first.", Toast.LENGTH_SHORT).show();
            return;
        }

        InputImage image = InputImage.fromBitmap(imageBitmap, 0);
        ImageLabeling labeler = ImageLabeling.getClient(ImageLabelerOptions.DEFAULT_OPTIONS);

        // Perform image labeling
        labeler.process(image)
                .addOnSuccessListener(labels -> {
                    if (!labels.isEmpty()) {
                        String searchQuery = labels.get(0).getText();
                        Toast.makeText(MainActivity.this, searchQuery, Toast.LENGTH_SHORT).show();
                        searchData(searchQuery);
                    } else {
                        Toast.makeText(MainActivity.this, "No labels detected in the image.", Toast.LENGTH_SHORT).show();
                    }
                })
                .addOnFailureListener(e -> Toast.makeText(MainActivity.this, "Failed to detect image.", Toast.LENGTH_SHORT).show());
    }

    // Perform search query using API
    @SuppressLint("NotifyDataSetChanged")
    private void searchData(String searchQuery) {
        String apiKey = "YOUR_API_KEY";
        String url = "https://serpapi.com/search.json?q=" + searchQuery.trim() +
                "&location=Delhi,India&hl=en&gl=us&google_domain=google.com&api_key=" + apiKey;

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
                Request.Method.GET, url, null,
                response -> {
                    try {
                        JSONArray organicResultsArray = response.getJSONArray("organic_results");
                        for (int i = 0; i < organicResultsArray.length(); i++) {
                            JSONObject organicObj = organicResultsArray.getJSONObject(i);
                            title = organicObj.optString("title", "");
                            link = organicObj.optString("link", "");
                            displayedLink = organicObj.optString("displayed_link", "");
                            snippet = organicObj.optString("snippet", "");

                            dataModalArrayList.add(new DataModel(title, link, displayedLink, snippet));
                        }

                        adapter.notifyDataSetChanged();
                        binding.recyclerView.setAdapter(adapter);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                },
                error -> {
                    error.printStackTrace();
                    Toast.makeText(MainActivity.this, "No result found for the search query.", Toast.LENGTH_SHORT).show();
                });

        Volley.newRequestQueue(this).add(jsonObjectRequest);
    }

    // Launch camera to capture image
    @SuppressLint("QueryPermissionsNeeded")
    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            takeImageLauncher.launch(takePictureIntent);
        }
    }
}