Data Store and Retrive on FirebaseDatabase in Android Studio Java

MainActivity.java

package com.example.firebaseproject2;

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


import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.MimeTypeMap;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
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.ArrayList;


public class MainActivity extends AppCompatActivity{
    ImageView imageView;
    EditText title,rating,category,date;
    Button save,show;
    ProgressBar progressBar;

    DatabaseReference databaseReference;
    StorageReference storageReference;
    Uri imguri;
    StorageTask storageTask;

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

        imageView = (ImageView) findViewById(R.id.imageView);
        imageView.setImageResource(R.drawable.dgfhfhf);
        title = (EditText) findViewById(R.id.editTextTextPersonName);
        rating = (EditText) findViewById(R.id.editTextTextPersonName2);
        category = (EditText) findViewById(R.id.editTextTextPersonName3);
        date = (EditText) findViewById(R.id.editTextTextPersonName4);
        title.setText(null);
        rating.setText(null);
        category.setText(null);
        date.setText(null);
        save = (Button) findViewById(R.id.save);
        show = (Button) findViewById(R.id.show);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        progressBar.setVisibility(View.INVISIBLE);

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

        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    imageLoad();
                }catch (Exception e){
                    Toast.makeText(MainActivity.this, "Error is : "+e, Toast.LENGTH_SHORT).show();
                }
            }
        });
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    if (storageTask != null && storageTask.isInProgress()){
                        Toast.makeText(MainActivity.this, "It is Progressing!", Toast.LENGTH_SHORT).show();
                    }else{
                        dataUploader();
                    }
                }catch (Exception e){
                    Toast.makeText(MainActivity.this, "Error is : "+e, Toast.LENGTH_SHORT).show();
                }
            }
        });
        show.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this,SecondActivity.class));
            }
        });
    }


    private String getExtention(Uri imguri) {
        ContentResolver contentResolver = getContentResolver(); //using for get the extention in image.
        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
        return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(imguri));
    }
    private void dataUploader() {
        try {
            progressBar.setVisibility(View.VISIBLE);
            final String tit = title.getText().toString();
            final String rati = rating.getText().toString();
            final String cat = category.getText().toString();
            final String dt = date.getText().toString();
            if (!tit.isEmpty() && !rati.isEmpty() && !cat.isEmpty() && !dt.isEmpty()){
                storageTask = storageReference.child(System.currentTimeMillis()+"."+getExtention(imguri)).putFile(imguri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        Task<Uri> uriTask = taskSnapshot.getStorage().getDownloadUrl();
                        while (!uriTask.isSuccessful());
                        Uri downloadurl = uriTask.getResult();

                        Movies movies = new Movies(tit,rati,cat,dt,downloadurl.toString());

                        String key = databaseReference.push().getKey().toString();
                        databaseReference.child(key).setValue(movies);
                        progressBar.setVisibility(View.INVISIBLE);
                        title.setText(null);
                        rating.setText(null);
                        category.setText(null);
                        date.setText(null);
                        imageView.setImageResource(R.drawable.dgfhfhf);
                        Toast.makeText(MainActivity.this, "Successfully Uploaded Data Into Database!", Toast.LENGTH_SHORT).show();
                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        progressBar.setVisibility(View.INVISIBLE);
                        Toast.makeText(MainActivity.this, "Faild to Uploaded Data", Toast.LENGTH_SHORT).show();
                    }
                });
            }else {
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setIcon(R.drawable.error);
                builder.setTitle("Error!");
                builder.setMessage("Please Fill the all Fields and select a image click gallery icon!");
                builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        progressBar.setVisibility(View.INVISIBLE);
                    }
                });
                builder.show();
            }
        }catch (Exception e){
            Toast.makeText(this, "Error is : "+e, Toast.LENGTH_SHORT).show();
        }
    }


    /**Start Access the mobile file location for get the image and set the image into image view*/
    private void imageLoad() {
        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*/
}

class Movies{
    String title,rating,category,date,imgurl;

    public Movies() {
    }

    public Movies(String title, String rating, String category, String date, String imgurl) {
        this.title = title;
        this.rating = rating;
        this.category = category;
        this.date = date;
        this.imgurl = imgurl;
    }

    public String getTitle() {
        return title;
    }

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

    public String getRating() {
        return rating;
    }

    public void setRating(String rating) {
        this.rating = rating;
    }

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getImgurl() {
        return imgurl;
    }

    public void setImgurl(String imgurl) {
        this.imgurl = imgurl;
    }
}

package com.example.firebaseproject2;

        import android.content.Context;
        import android.os.Bundle;
        import android.view.LayoutInflater;
        import android.view.View;
        import android.view.ViewGroup;
        import android.widget.AdapterView;
        import android.widget.BaseAdapter;
        import android.widget.Button;
        import android.widget.GridView;
        import android.widget.ImageView;
        import android.widget.TextView;
        import android.widget.Toast;

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

        import com.google.firebase.database.DataSnapshot;
        import com.google.firebase.database.DatabaseError;
        import com.google.firebase.database.DatabaseReference;
        import com.google.firebase.database.FirebaseDatabase;
        import com.google.firebase.database.ValueEventListener;
        import com.google.firebase.storage.FirebaseStorage;
        import com.squareup.picasso.Picasso;

        import java.util.ArrayList;

public class SecondActivity extends AppCompatActivity {

    GridView gridView;
    ArrayList<Movies> list;
    CustomAdapter customAdapter;
    DatabaseReference databaseReference;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.grid_layout);

        gridView = (GridView) findViewById(R.id.gridView);
        list = new ArrayList<>();

        customAdapter = new CustomAdapter(this,list);
        gridView.setAdapter(customAdapter);


        databaseReference = FirebaseDatabase.getInstance().getReference("Movies");
        databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()){
                    Movies movies = dataSnapshot1.getValue(Movies.class);
                    list.add(movies);
                }
                customAdapter.notifyDataSetChanged();
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });

    }
}

class CustomAdapter extends BaseAdapter {
    Context context;
    ArrayList<Movies> list;
    LayoutInflater layoutInflater;

    public CustomAdapter(Context context, ArrayList<Movies> list) {
        this.context = context;
        this.list = list;
        layoutInflater = LayoutInflater.from(context);
    }

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

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = layoutInflater.inflate(R.layout.item_collection,null);

        ImageView imageView = (ImageView) convertView.findViewById(R.id.imageView5);
        TextView title = (TextView) convertView.findViewById(R.id.textView);
        TextView rating = (TextView) convertView.findViewById(R.id.textView2);
        TextView category = (TextView) convertView.findViewById(R.id.textView3);
        TextView date = (TextView) convertView.findViewById(R.id.textView4);
        Button button = (Button) convertView.findViewById(R.id.button2);

        Movies currentMovie = list.get(position);

        Picasso.get().load(currentMovie.getImgurl()).into(imageView);
        title.setText(currentMovie.getTitle());
        rating.setText(currentMovie.getRating());
        category.setText(currentMovie.getCategory());
        date.setText(currentMovie.getDate());

        return convertView;
    }
}