$$Jeberson A_J$$#P.S.R Engineering college#Login using OTP authentication#Intro_slider#Create a new profile#View profile list#Connected with Firebase database#

internshalla_Task_1_detail.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.squareup.picasso.Picasso;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

public class detail extends AppCompatActivity {

    TextView nameDetailTextView,dobDetailTextView,ageDetailTextView,gotraDetailTextView,birthplaceDetailTextView,birthtimeDetailTextView,CityDetailTextView,occupationDetailTextView,mobileDetailTextView,descriptionDetailTextView,dateDetailTextView,categoryDetailTextView;
    ImageView teacherDetailImageView;

    private void initializeWidgets(){
        nameDetailTextView= findViewById(R.id.nameDetailTextView);
        dateDetailTextView= findViewById(R.id.dateDetailTextView);
        dobDetailTextView= findViewById(R.id.dobDetailTextView);
        ageDetailTextView= findViewById(R.id.ageDetailTextView);
        birthplaceDetailTextView= findViewById(R.id.birthplaceDetailTextView);
        birthtimeDetailTextView= findViewById(R.id.birthtimeDetailTextView);
        CityDetailTextView= findViewById(R.id.CityDetailTextView);
        descriptionDetailTextView= findViewById(R.id.descriptionDetailTextView);
        gotraDetailTextView= findViewById(R.id.gotraDetailTextView);
        occupationDetailTextView= findViewById(R.id.occupationDetailTextView);
        mobileDetailTextView= findViewById(R.id.mobileDetailTextView);
        categoryDetailTextView= findViewById(R.id.categoryDetailTextView);
        teacherDetailImageView=findViewById(R.id.teacherDetailImageView);
    }
    private String getDateToday(){
        DateFormat dateFormat=new SimpleDateFormat("yyyy/MM/dd");
        Date date=new Date();
        String today= dateFormat.format(date);
        return today;
    }
    private String getRandomCategory(){
        String[] categories={"ZEN","BUDHIST","YOGA"};
        Random random=new Random();
        int index=random.nextInt(categories.length-1);
        return categories[index];
    }

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

        initializeWidgets();

        //RECEIVE DATA FROM ITEMSACTIVITY VIA INTENT
        Intent i=this.getIntent();
        String name=i.getExtras().getString("NAME_KEY");
        String dob=i.getExtras().getString("DOB_KEY");
        String age=i.getExtras().getString("AGE_KEY");
        String birth_place=i.getExtras().getString("BIRTH_PLACE_KEY");
        String birth_time=i.getExtras().getString("BIRTH_TIME_KEY");
        String city=i.getExtras().getString("CITY_KEY");
        String description=i.getExtras().getString("DESCRIPTION_KEY");
        String gotra=i.getExtras().getString("GOTRA_KEY");
        String occupation=i.getExtras().getString("OCCUPATION_KEY");
        String mobile=i.getExtras().getString("MOBILE_KEY");
        String imageURL=i.getExtras().getString("IMAGE_KEY");

        //SET RECEIVED DATA TO TEXTVIEWS AND IMAGEVIEWS
        nameDetailTextView.setText(name);
        dateDetailTextView.setText(" "+getDateToday());
        dobDetailTextView.setText(dob);
        ageDetailTextView.setText(age);
        birthplaceDetailTextView.setText(birth_place);
        birthtimeDetailTextView.setText(birth_time);
        CityDetailTextView.setText(city);
        descriptionDetailTextView.setText(description);
        gotraDetailTextView.setText(gotra);
        occupationDetailTextView.setText(occupation);
        mobileDetailTextView.setText(mobile);
        categoryDetailTextView.setText("CATEGORY:               "+getRandomCategory());
        Picasso.get()
                .load(imageURL)
                .placeholder(R.drawable.placeholder)
                .fit()
                .centerCrop()
                .into(teacherDetailImageView);

    }

}

internshalla_Task_1_items.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnSuccessListener;
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 java.util.ArrayList;
import java.util.List;

public class items extends AppCompatActivity implements RecyclerAdapter.OnItemClickListener{

    private RecyclerView mRecyclerView;
    private RecyclerAdapter mAdapter;
    private ProgressBar mProgressBar;
    private FirebaseStorage mStorage;
    private DatabaseReference mDatabaseRef;
    private ValueEventListener mDBListener;
    private List<Teacher> mTeachers;

    private void openDetailActivity(String[] data){
        Intent intent = new Intent(this, detail.class);
        intent.putExtra("NAME_KEY",data[0]);
        intent.putExtra("DOB_KEY",data[1]);
        intent.putExtra("AGE_KEY",data[2]);
        intent.putExtra("BIRTH_PLACE_KEY",data[3]);
        intent.putExtra("BIRTH_TIME_KEY",data[4]);
        intent.putExtra("CITY_KEY",data[5]);
        intent.putExtra("DESCRIPTION_KEY",data[6]);
        intent.putExtra("GOTRA_KEY",data[7]);
        intent.putExtra("OCCUPATION_KEY",data[8]);
        intent.putExtra("MOBILE_KEY",data[9]);
        intent.putExtra("IMAGE_KEY",data[10]);



        startActivity(intent);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate ( savedInstanceState );
        setContentView ( R.layout.activity_items );

        mRecyclerView = findViewById(R.id.mRecyclerView);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

        mProgressBar = findViewById(R.id.myDataLoaderProgressBar);
        mProgressBar.setVisibility(View.VISIBLE);

        mTeachers = new ArrayList<> ();
        mAdapter = new RecyclerAdapter (items.this, mTeachers);
        mRecyclerView.setAdapter(mAdapter);
        mAdapter.setOnItemClickListener(items.this);

        mStorage = FirebaseStorage.getInstance();
        mDatabaseRef = FirebaseDatabase.getInstance().getReference("teachers_uploads");

        mDBListener = mDatabaseRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                mTeachers.clear();

                for (DataSnapshot teacherSnapshot : dataSnapshot.getChildren()) {
                    Teacher upload = teacherSnapshot.getValue(Teacher.class);
                    upload.setKey(teacherSnapshot.getKey());
                    mTeachers.add(upload);
                }
                mAdapter.notifyDataSetChanged();
                mProgressBar.setVisibility(View.GONE);
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Toast.makeText(items.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
                mProgressBar.setVisibility(View.INVISIBLE);
            }
        });

    }
    public void onItemClick(int position) {
        Teacher clickedTeacher=mTeachers.get(position);
        String[] teacherData={clickedTeacher.getName(),clickedTeacher.getDob(),clickedTeacher.getAge(),clickedTeacher.getBirthplace(),clickedTeacher.getBirthtime(),clickedTeacher.getCity(),clickedTeacher.getDescription(),clickedTeacher.getGotra(),clickedTeacher.getOccupation(),clickedTeacher.getmobile(),clickedTeacher.getImageUrl()};
        openDetailActivity(teacherData);
    }

    @Override
    public void onShowItemClick(int position) {
        Teacher clickedTeacher=mTeachers.get(position);
        String[] teacherData={clickedTeacher.getName(),clickedTeacher.getDob(),clickedTeacher.getAge(),clickedTeacher.getBirthplace(),clickedTeacher.getBirthtime(),clickedTeacher.getCity(),clickedTeacher.getDescription(),clickedTeacher.getGotra(),clickedTeacher.getOccupation(),clickedTeacher.getmobile(),clickedTeacher.getImageUrl()};
        openDetailActivity(teacherData);
    }

    @Override
    public void onDeleteItemClick(int position) {
        Teacher selectedItem = mTeachers.get(position);
        final String selectedKey = selectedItem.getKey();

        StorageReference imageRef = mStorage.getReferenceFromUrl(selectedItem.getImageUrl());
        imageRef.delete().addOnSuccessListener(new OnSuccessListener<Void> () {
            @Override
            public void onSuccess(Void aVoid) {
                mDatabaseRef.child(selectedKey).removeValue();
                Toast.makeText(items.this, "Item deleted", Toast.LENGTH_SHORT).show();
            }
        });

    }
    protected void onDestroy() {
        super.onDestroy();
        mDatabaseRef.removeEventListener(mDBListener);
    }

}

internshalla_Task_1_login.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

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

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseException;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.PhoneAuthCredential;
import com.google.firebase.auth.PhoneAuthProvider;

import java.util.concurrent.TimeUnit;

public class login extends AppCompatActivity {

    Button btnGenerateOTP, btnSignIn;

    EditText etPhoneNumber, etOTP;

    String phoneNumber, otp;

    FirebaseAuth auth;

    PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallback;
    private String verificationCode;

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

        StartFirebaseLogin();

        btnGenerateOTP.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                phoneNumber=etPhoneNumber.getText().toString();

                PhoneAuthProvider.getInstance().verifyPhoneNumber(
                        phoneNumber,                     // Phone number to verify

                        60,                           // Timeout duration
                        TimeUnit.SECONDS,                // Unit of timeout
                        login.this,        // Activity (for callback binding)
                        mCallback);                      // OnVerificationStateChangedCallbacks
            }
        });

        btnSignIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                otp=etOTP.getText().toString();

                PhoneAuthCredential credential = PhoneAuthProvider.getCredential(verificationCode, otp);

                SigninWithPhone(credential);
            }
        });
    }

    private void SigninWithPhone(PhoneAuthCredential credential) {
        auth.signInWithCredential(credential)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            startActivity(new Intent(login.this,profile.class));
                            finish();
                        } else {
                            Toast.makeText(login.this,"Incorrect OTP",Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

    private void findViews() {
        btnGenerateOTP= findViewById(R.id.btn_generate_otp);
        btnSignIn= findViewById(R.id.btn_sign_in);

        etPhoneNumber= findViewById(R.id.et_phone_number);
        etOTP= findViewById(R.id.et_otp);
    }

    private void StartFirebaseLogin() {

        auth = FirebaseAuth.getInstance();
        mCallback = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

            @Override
            public void onVerificationCompleted(PhoneAuthCredential phoneAuthCredential) {
                Toast.makeText(login.this,"verification completed",Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onVerificationFailed(FirebaseException e) {
                Toast.makeText(login.this,"verification failed",Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onCodeSent(String s, PhoneAuthProvider.ForceResendingToken forceResendingToken) {
                super.onCodeSent(s, forceResendingToken);
                verificationCode = s;
                Toast.makeText(login.this,"Code sent",Toast.LENGTH_SHORT).show();
            }
        };
    }


}

internshalla_Task_1_MainActivity.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        findViewById(R.id.btn_play_again).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // We normally won't show the welcome slider again in real app
                // but this is for testing
                PrefManager prefManager = new PrefManager(getApplicationContext());

                // make first time launch TRUE
                prefManager.setFirstTimeLaunch(true);

                startActivity(new Intent(MainActivity.this, WelcomeActivity.class));
                finish();
            }
        });
    }
}

internshalla_Task_1_PrefManager.java

package com.jeberson.internshalla_Task_1;

import android.content.Context;
import android.content.SharedPreferences;

/**
 * Created by Jeberson A J on 01/05/20.
 */
public class PrefManager {
    SharedPreferences pref;
    SharedPreferences.Editor editor;
    Context _context;

    // shared pref mode
    int PRIVATE_MODE = 0;

    // Shared preferences file name
    private static final String PREF_NAME = ".profile";

    private static final String IS_FIRST_TIME_LAUNCH = "IsFirstTimeLaunch";

    public PrefManager(Context context) {
        this._context = context;
        pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

    public void setFirstTimeLaunch(boolean isFirstTime) {
        editor.putBoolean(IS_FIRST_TIME_LAUNCH, isFirstTime);
        editor.commit();
    }

    public boolean isFirstTimeLaunch() {
        return pref.getBoolean(IS_FIRST_TIME_LAUNCH, true);
    }

}

internshalla_Task_1_profile.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

import androidx.appcompat.app.AppCompatActivity;



public class profile extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate ( savedInstanceState );
        setContentView ( R.layout.activity_profile );

        Button openTeachersActivityBtn = findViewById(R.id.openTeachersActivityBtn);
        Button openUploadActivityBtn = findViewById(R.id.openUploadActivityBtn);
        ImageButton logout = findViewById(R.id.logout);

        openTeachersActivityBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(profile.this, items.class);
                startActivity(i);
            }
        });
        openUploadActivityBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(profile.this, upload.class);
                startActivity(i);
            }
        });

        logout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(profile.this,MainActivity.class);
                startActivity(i);
            }
        });

    }

}

internshalla_Task_1_RecyclerAdapter.java

package com.jeberson.internshalla_Task_1;


import android.content.Context;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.recyclerview.widget.RecyclerView;

import com.squareup.picasso.Picasso;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public  class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.RecyclerViewHolder>{
    private Context mContext;
    private List<Teacher> teachers;
    private OnItemClickListener mListener;

    public RecyclerAdapter(Context context, List<Teacher> uploads) {
        mContext = context;
        teachers = uploads;
    }

    @Override
    public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(mContext).inflate(R.layout.row_mode, parent, false);
        return new RecyclerViewHolder(v);
    }

    @Override
    public void onBindViewHolder(RecyclerViewHolder holder, int position) {
        Teacher currentTeacher = teachers.get(position);
        holder.nameTextView.setText(currentTeacher.getName());
        holder.ageTextView.setText(currentTeacher.getAge());
        holder.dobTextView1.setText(currentTeacher.getDob());
        holder.birthplaceTextView.setText(currentTeacher.getBirthplace());
        holder.birthtimeTextView.setText(currentTeacher.getBirthtime());
        holder.cityTextView.setText(currentTeacher.getCity());
        holder.gotraTextView.setText(currentTeacher.getGotra());
        holder.occupationTextView.setText(currentTeacher.getOccupation());
        holder.mobileTextView.setText(currentTeacher.getmobile());
        holder.descriptionTextView.setText(currentTeacher.getDescription());
        holder.dateTextView.setText(getDateToday());
        Picasso.get()
                .load(currentTeacher.getImageUrl())
                .placeholder(R.drawable.placeholder)
                .fit()
                .centerCrop()
                .into(holder.teacherImageView);
    }

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

    public class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,
            View.OnCreateContextMenuListener, MenuItem.OnMenuItemClickListener {

        public TextView nameTextView,dobTextView1,ageTextView,birthplaceTextView,birthtimeTextView,cityTextView,gotraTextView,occupationTextView,mobileTextView,descriptionTextView,dateTextView;
        public ImageView teacherImageView;


        public RecyclerViewHolder(View itemView) {
            super(itemView);
            nameTextView =itemView.findViewById ( R.id.nameTextView );
            dobTextView1 =itemView.findViewById ( R.id.dobTextView1 );
            ageTextView = itemView.findViewById( R.id.ageTextView);
            birthplaceTextView =itemView.findViewById ( R.id.birthplaceTextView );
            birthtimeTextView =itemView.findViewById ( R.id.birthtimeTextView );
            cityTextView =itemView.findViewById ( R.id.cityTextView );
            gotraTextView = itemView.findViewById( R.id.gotraTextView);
            occupationTextView =itemView.findViewById ( R.id.occupationTextView );
            mobileTextView =itemView.findViewById ( R.id.mobileTextView );
            descriptionTextView = itemView.findViewById(R.id.descriptionTextView);
            dateTextView = itemView.findViewById( R.id.dateTextView);
            teacherImageView = itemView.findViewById( R.id.teacherImageView);

            itemView.setOnClickListener(this);
            itemView.setOnCreateContextMenuListener(this);
        }

        @Override
        public void onClick(View v) {
            if (mListener != null) {
                int position = getAdapterPosition();
                if (position != RecyclerView.NO_POSITION) {
                    mListener.onItemClick(position);
                }
            }
        }

        @Override
        public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
            menu.setHeaderTitle("Select Action");
            MenuItem showItem = menu.add( Menu.NONE, 1, 1, "Show");
            MenuItem deleteItem = menu.add(Menu.NONE, 2, 2, "Delete");

            showItem.setOnMenuItemClickListener(this);
            deleteItem.setOnMenuItemClickListener(this);
        }

        @Override
        public boolean onMenuItemClick(MenuItem item) {
            if (mListener != null) {
                int position = getAdapterPosition();
                if (position != RecyclerView.NO_POSITION) {

                    switch (item.getItemId()) {
                        case 1:
                            mListener.onShowItemClick(position);
                            return true;
                        case 2:
                            mListener.onDeleteItemClick(position);
                            return true;
                    }
                }
            }
            return false;
        }
    }

    public interface OnItemClickListener {
        void onItemClick(int position);
        void onShowItemClick(int position);
        void onDeleteItemClick(int position);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        mListener = listener;
    }
    private String getDateToday(){
        DateFormat dateFormat=new SimpleDateFormat("yyyy/MM/dd");
        Date date=new Date();
        String today= dateFormat.format(date);
        return today;
    }
}

internshalla_Task_1_signed_in.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class signed_in extends AppCompatActivity {

    TextView tvPhoneNumber;
    Button btnSignOut;

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

        findViews();

        setPhoneNumber();

        btnSignOut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FirebaseAuth.getInstance().signOut();
                startActivity(new Intent(signed_in.this,login.class));
                finish();
            }
        });
    }

    private void findViews() {
        tvPhoneNumber= (TextView) findViewById(R.id.tv_phone_number);
        btnSignOut= (Button) findViewById(R.id.btn_sign_out);
    }

    private void setPhoneNumber(){
        FirebaseUser user= FirebaseAuth.getInstance().getCurrentUser();
        try {
            tvPhoneNumber.setText(user.getPhoneNumber());
        }catch (Exception e){
            Toast.makeText(this,"Phone number not found",Toast.LENGTH_SHORT).show();
        }
    }
}

internshalla_Task_1_splash_screen.java

package com.jeberson.internshalla_Task_1;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

import java.util.Timer;
import java.util.TimerTask;

public class splash_screen extends AppCompatActivity {

    Timer timer;

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


        timer=new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                Intent i = new Intent(splash_screen.this,MainActivity.class);
                startActivity(i);
                finish();
            }
        },4000);



    }
}

internshalla_Task_1_Teacher.java

package com.jeberson.internshalla_Task_1;



import com.google.firebase.database.Exclude;

public class Teacher {
    private String name;
    private String dob;
    private String birthplace;
    private String birthtime;
    private String city;
    private String occupation;
    private String mobile;
    private String gotra;
    private String age;
    private String imageURL;
    private String key;
    private String description;
    private int position;

    public Teacher() {
        //empty constructor needed
    }
    public Teacher (int position){
        this.position = position;
    }
    public Teacher(String name,String dob, String gotra, String age, String birthplace, String birthtime, String city, String occupation, String mobile, String imageUrl ,String Des) {
        if (name.trim().equals("")) {
            name = "No Name";
        }
        if (dob.trim().equals("")) {
            dob = "No Name";
        }
        if (age.trim().equals("")) {
            age = "No Name";
        }
        if (birthplace.trim().equals("")) {
            birthplace = "No Name";
        }
        if (birthtime.trim().equals("")) {
            birthtime = "No Name";
        }
        if (gotra.trim().equals("")) {
            gotra = "No Name";
        }
        if (city.trim().equals("")) {
            city = "No Name";
        }
        if (occupation.trim().equals("")) {
            occupation = "No Name";
        }
        if (mobile.trim().equals("")) {
            mobile = "No Name";
        }
        this.name = name;
        this.dob = dob;
        this.age = age;
        this.birthplace = birthplace;
        this.birthtime = birthtime;
        this.gotra = gotra;
        this.city = city;
        this.occupation = occupation;
        this.mobile = mobile;
        this.imageURL = imageUrl;
        this.description = Des;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getDob() {
        return dob;
    }
    public void setDob(String dob) {
        this.dob = dob;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public String getBirthplace() {
        return birthplace;
    }
    public void setBirthplace(String birthplace) {
        this.birthplace = birthplace;
    }
    public String getBirthtime() {
        return birthtime;
    }
    public void setBirthtime(String birthtime) {
        this.birthtime = birthtime;
    }
    public String getGotra() {
        return gotra;
    }
    public void setGotra(String gotra) {
        this.gotra = gotra;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getOccupation() {
        return occupation;
    }
    public void setOccupation(String occupation) {
        this.occupation = occupation;
    }
    public String getmobile() {
        return mobile;
    }
    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getImageUrl() {
        return imageURL;
    }
    public void setImageUrl(String imageUrl) {
        this.imageURL = imageUrl;
    }
    @Exclude
    public String getKey() {
        return key;
    }
    @Exclude
    public void setKey(String key) {
        this.key = key;
    }
}

internshalla_Task_1_upload.java

package com.jeberson.internshalla_Task_1;

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

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

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.OnProgressListener;
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.Objects;

public class upload extends AppCompatActivity{

    private static final int PICK_IMAGE_REQUEST = 5;

    private EditText nameEditText;
    private EditText dobEditText1;
    private EditText birthplaceEditText1;
    private EditText birthtimeEdiText1;
    private EditText cityEditText1;
    private EditText gotraEditText1;
    private EditText ageEditText1;
    private EditText occupationEditText1;
    private EditText mobileEditText1;
    private EditText descriptionEditText;
    private ImageView chosenImageView;
    private ProgressBar uploadProgressBar;

    private Uri mImageUri;

    private StorageReference mStorageRef;
    private DatabaseReference mDatabaseRef;

    private StorageTask mUploadTask;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate ( savedInstanceState );
        setContentView ( R.layout.activity_upload );

        Button chooseImageBtn = findViewById(R.id.button_choose_image);
        Button uploadBtn = findViewById(R.id.uploadBtn);
        nameEditText = findViewById(R.id.nameEditText);
        dobEditText1 = findViewById(R.id.dobEditText1);
        gotraEditText1 = findViewById(R.id.gotraEditText1);
        ageEditText1 = findViewById(R.id.ageEditText1);
        birthplaceEditText1 = findViewById(R.id.birthplaceEditText1);
        birthtimeEdiText1 = findViewById(R.id.birthtimeEditText1);
        cityEditText1 = findViewById(R.id.cityEditText1);
        occupationEditText1 = findViewById(R.id.occupationEditText1);
        mobileEditText1 = findViewById(R.id.mobileEditText1);
        descriptionEditText = findViewById ( R.id.descriptionEditText );
        chosenImageView = findViewById(R.id.chosenImageView);
        uploadProgressBar = findViewById(R.id.progress_bar);

        mStorageRef = FirebaseStorage.getInstance().getReference("teachers_uploads");
        mDatabaseRef = FirebaseDatabase.getInstance().getReference("teachers_uploads");

        chooseImageBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openFileChooser();
            }
        });

        uploadBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mUploadTask != null && mUploadTask.isInProgress()) {
                    Toast.makeText(upload.this, "An Upload is Still in Progress", Toast.LENGTH_SHORT).show();
                } else {
                    uploadFile();
                }
            }
        });
    }
    private void openFileChooser() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent, PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK
                && data != null && data.getData() != null) {
            mImageUri = data.getData();

            Picasso.get().load(mImageUri).into(chosenImageView);
        }
    }

    private String getFileExtension(Uri uri) {
        ContentResolver cR = getContentResolver();
        MimeTypeMap mime = MimeTypeMap.getSingleton();
        return mime.getExtensionFromMimeType(cR.getType(uri));
    }

    private void uploadFile() {
        if (mImageUri != null) {
            StorageReference fileReference = mStorageRef.child(System.currentTimeMillis()
                    + "." + getFileExtension(mImageUri));

            uploadProgressBar.setVisibility(View.VISIBLE);
            uploadProgressBar.setIndeterminate(true);

            mUploadTask = fileReference.putFile(mImageUri)
                    .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot> () {
                        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
                        @Override
                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                            Handler handler = new Handler();
                            handler.postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    uploadProgressBar.setVisibility(View.VISIBLE);
                                    uploadProgressBar.setIndeterminate(false);
                                    uploadProgressBar.setProgress(0);
                                }
                            }, 500);

                            Toast.makeText(upload.this, "Teacher  Upload successful", Toast.LENGTH_LONG).show();
                            Teacher upload = new Teacher(nameEditText.getText().toString().trim(),dobEditText1.getText().toString().trim(),gotraEditText1.getText().toString().trim(),ageEditText1.getText().toString().trim(),birthplaceEditText1.getText().toString().trim(),
                                    birthtimeEdiText1.getText().toString().trim(),cityEditText1.getText().toString().trim(),occupationEditText1.getText().toString().trim(),
                                    mobileEditText1.getText().toString().trim(),
                                    Objects.requireNonNull(Objects.requireNonNull(taskSnapshot.getMetadata()).getReference()).getDownloadUrl().toString(),
                                    descriptionEditText.getText ().toString ());

                            String uploadId = mDatabaseRef.push().getKey();
                            mDatabaseRef.child(uploadId).setValue(upload);

                            uploadProgressBar.setVisibility(View.INVISIBLE);
                            openImagesActivity ();

                        }
                    })
                    .addOnFailureListener(new OnFailureListener () {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            uploadProgressBar.setVisibility(View.INVISIBLE);
                            Toast.makeText(upload.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                        }
                    })
                    .addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot> () {
                        @Override
                        public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                            double progress = (100.0 * taskSnapshot.getBytesTransferred() / taskSnapshot.getTotalByteCount());
                            uploadProgressBar.setProgress((int) progress);
                        }
                    });
        } else {
            Toast.makeText(this, "You haven't Selected Any file selected", Toast.LENGTH_SHORT).show();
        }
    }
    private void openImagesActivity(){
        Intent intent = new Intent(this, profile.class);
        startActivity(intent);
    }
}

internshalla_Task_1_WelcomeActivity.java

package com.jeberson.internshalla_Task_1;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;

import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;

import androidx.appcompat.app.AppCompatActivity;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class WelcomeActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private MyViewPagerAdapter myViewPagerAdapter;
    private LinearLayout dotsLayout;
    private TextView[] dots;
    private int[] layouts;
    private Button btnSkip, btnNext;
    private PrefManager prefManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Checking for first time launch - before calling setContentView()
        prefManager = new PrefManager(this);
        if (!prefManager.isFirstTimeLaunch()) {
            launchHomeScreen();
            finish();
        }

        // Making notification bar transparent
        if (Build.VERSION.SDK_INT >= 21) {
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        }

        setContentView(R.layout.activity_welcome);

        viewPager = (ViewPager) findViewById(R.id.view_pager);
        dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
        btnSkip = (Button) findViewById(R.id.btn_skip);
        btnNext = (Button) findViewById(R.id.btn_next);


        // layouts of all welcome sliders
        // add few more layouts if you want
        layouts = new int[]{
                R.layout.welcome_slide1,
                R.layout.welcome_slide2,
                R.layout.welcome_slide3,
                R.layout.welcome_slide4};

        // adding bottom dots
        addBottomDots(0);

        // making notification bar transparent
        changeStatusBarColor();

        myViewPagerAdapter = new MyViewPagerAdapter();
        viewPager.setAdapter(myViewPagerAdapter);
        viewPager.addOnPageChangeListener(viewPagerPageChangeListener);

        btnSkip.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchHomeScreen();
            }
        });

        btnNext.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // checking for last page
                // if last page home screen will be launched
                int current = getItem(+1);
                if (current < layouts.length) {
                    // move to next screen
                    viewPager.setCurrentItem(current);
                } else {
                    launchHomeScreen();
                }
            }
        });
    }

    private void addBottomDots(int currentPage) {
        dots = new TextView[layouts.length];

        int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
        int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);

        dotsLayout.removeAllViews();
        for (int i = 0; i < dots.length; i++) {
            dots[i] = new TextView(this);
            dots[i].setText(Html.fromHtml("&#8226;"));
            dots[i].setTextSize(35);
            dots[i].setTextColor(colorsInactive[currentPage]);
            dotsLayout.addView(dots[i]);
        }

        if (dots.length > 0)
            dots[currentPage].setTextColor(colorsActive[currentPage]);
    }

    private int getItem(int i) {
        return viewPager.getCurrentItem() + i;
    }

    private void launchHomeScreen() {
        prefManager.setFirstTimeLaunch(false);
        startActivity(new Intent(WelcomeActivity.this, login.class));
        finish();
    }

    //	viewpager change listener
    ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            addBottomDots(position);

            // changing the next button text 'NEXT' / 'GOT IT'
            if (position == layouts.length - 1) {
                // last page. make button text to GOT IT
                btnNext.setText(getString(R.string.start));
                btnSkip.setVisibility(View.GONE);
            } else {
                // still pages are left
                btnNext.setText(getString(R.string.next));
                btnSkip.setVisibility(View.VISIBLE);
            }
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {

        }

        @Override
        public void onPageScrollStateChanged(int arg0) {

        }
    };

    /**
     * Making notification bar transparent
     */
    private void changeStatusBarColor() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
        }
    }

    /**
     * View pager adapter
     */
    public class MyViewPagerAdapter extends PagerAdapter {
        private LayoutInflater layoutInflater;

        public MyViewPagerAdapter() {
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View view = layoutInflater.inflate(layouts[position], container, false);
            container.addView(view);

            return view;
        }

        @Override
        public int getCount() {
            return layouts.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object obj) {
            return view == obj;
        }


        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            View view = (View) object;
            container.removeView(view);
        }
    }
}