How To Enable Download Option In Android? Java For Enable Download Option

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.target.CustomTarget;
import com.bumptech.glide.request.transition.Transition;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private static final int PERMISSION_REQUEST_CODE = 100;
    private ImageView imageView;
    private String imageUrl = "YOUR_IMAGE_URL_HERE";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initialize imageView
        imageView = findViewById(R.id.imageView);

        // Load image using Glide library
        Glide.with(this)
                .load(imageUrl)
                .into(imageView);

        // Request storage permission if not granted
        requestStoragePermission();
    }

    // Method to request storage permission
    private void requestStoragePermission() {
        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
        }
    }

    // Callback method for permission request result
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission granted, proceed with download
                downloadImage();
            } else {
                // Permission denied, show a toast message
                Toast.makeText(this, "Permission denied, unable to download image.", Toast.LENGTH_SHORT).show();
            }
        }
    }

    // Method to download image
    private void downloadImage() {
        Glide.with(this)
                .load(imageUrl)
                .into(new CustomTarget<Drawable>() {
                    @RequiresApi(api = Build.VERSION_CODES.Q)
                    @Override
                    public void onResourceReady(@NonNull Drawable resource, @NonNull Transition<? super Drawable> transition) {
                        // Save image to external storage
                        saveImage(resource);
                    }

                    @Override
                    public void onLoadCleared(@NonNull Drawable placeholder) {
                        // Not implemented
                    }
                });
    }

    // Method to save image to external storage
    @RequiresApi(api = Build.VERSION_CODES.Q)
    private void saveImage(Drawable drawable) {
        File directory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        if (!directory.exists()) {
            directory.mkdirs();
        }
        File file = new File(directory, "image_" + System.currentTimeMillis() + ".jpg");
        try {
            FileOutputStream fos = new FileOutputStream(file);
            drawableToBitmap(drawable).compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
            // Image saved, show a toast message
            Toast.makeText(this, "Image saved successfully.", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            e.printStackTrace();
            // Error occurred while saving image, show a toast message
            Toast.makeText(this, "Failed to save image.", Toast.LENGTH_SHORT).show();
        }
    }

    // Method to convert drawable to bitmap
    private Bitmap drawableToBitmap(Drawable drawable) {
        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
        }
        int width = drawable.getIntrinsicWidth();
        int height = drawable.getIntrinsicHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return bitmap;
    }
}