Upload image into Firebase Storage and Firebase database in Android Studio Java

ImageStore.java

package com.example.learningfirebase;

import android.content.ContentResolver;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.webkit.MimeTypeMap;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.StorageTask;
import com.google.firebase.storage.UploadTask;
import com.squareup.picasso.Picasso;

import java.util.HashMap;

public class ImageStore extends AppCompatActivity {
    Button load,save,show;
    ImageView imageView;
    ProgressBar progressBar;

    public Uri imguri;

    StorageReference storageReference;
    DatabaseReference databaseReference;
    private StorageTask storageTask;;

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

        storageReference = FirebaseStorage.getInstance().getReference("Images");
        databaseReference = FirebaseDatabase.getInstance().getReference("Images");


        imageView = (ImageView) findViewById(R.id.imageView2);
        load = (Button) findViewById(R.id.img_btn_load);
        save = (Button) findViewById(R.id.img_btn_save);
        show = (Button) findViewById(R.id.show_button);
        progressBar = (ProgressBar) findViewById(R.id.progressBar4);
        progressBar.setVisibility(View.INVISIBLE);

        load.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FileChooser();
            }
        });
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressBar.setVisibility(View.VISIBLE);
                if (storageTask != null && storageTask.isInProgress()){
                    Toast.makeText(ImageStore.this, "Upload is Progress", Toast.LENGTH_SHORT).show();
                }else{
                    FileUploader();
                }
            }
        });
        show.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ImageStore.this,ImageRetrieve.class));
            }
        });
    }

    

    /**Start the image save to Firebase Storage in the database*/
    private String getExtension(Uri uri){
        ContentResolver contentResolver = getContentResolver(); //using for get the extention in image.
        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
        return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(uri));
    }
    private void FileUploader() {
        storageTask = storageReference.child(System.currentTimeMillis()+"."+getExtension(imguri)).putFile(imguri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                progressBar.setVisibility(View.INVISIBLE);

                /*Database ekata Image eke url eka save karawanawa*/
                HashMap<String,String> hashMap = new HashMap<>();

                //Get image Download URL//
                Task<Uri> uriTask = taskSnapshot.getStorage().getDownloadUrl();
                while (!uriTask.isSuccessful());
                Uri downloadUrl = uriTask.getResult();

                hashMap.put("imgUrl",downloadUrl.toString());
                String imgKey = databaseReference.push().getKey();
                databaseReference.child(imgKey).setValue(hashMap);

                Toast.makeText(ImageStore.this, "Image Uploaded Successfully!", Toast.LENGTH_SHORT).show();
            }
        });
    }
    /**End the image save to Firebase Storage in the database*/


    /**Start Access the mobile file location for get the image and set the image into image view*/
    private void FileChooser() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent,1);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1 && resultCode == RESULT_OK && data != null && data.getData() != null)
        {
            imguri = data.getData();
            Picasso.get().load(imguri).into(imageView);
            //imageView.setImageURI(imguri);
        }
    }
    /**End Access the mobile file location for get the image and set the image into image view*/
    
}