How to save data to firebase with android studio

February 08, 2022

How to save data to firebase with android studio

Android Studio is a great platform for creating apps that can be deployed on the google play store. If you're new to the series go and check out the Android app development Playlist. There, you will be able to see how to create basic apps so you can become a developer.

What is Firebase ?

Google Firebase is a Google-backed application development software that enables developers to develop iOS, Android and Web apps. Firebase provides tools for tracking analytics, reporting and fixing app crashes, creating marketing and product experiment.

https://firebase.google.com

Creating a realtime database and saving the data into the firebase database with android studio using setvalue function and store the attendance status for the created attendance app .

🠷🠷🠷Tutorial 🠷🠷🠷

Part 1: https://youtu.be/nKhXtul24os

Part 2: https://youtu.be/gr2wcAqPnKY

Part 3: https://youtu.be/Dg26qEQGFRA

🠷🠷🠷Code 🠷🠷🠷

Home.java

package com.example.attendance;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

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

public class Home extends AppCompatActivity {

    FirebaseAuth mAuth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        mAuth=FirebaseAuth.getInstance();
    }

    @Override
    protected void onStart() {
        super.onStart();
        FirebaseUser user=mAuth.getCurrentUser();
        if(user==null){
            startActivity(new Intent(this,Register.class));
        }
    }

    public void mark(View view) {
        Intent i=new Intent(Home.this,MainActivity.class);
        startActivity(i);
    }
    public void view(View view) {
        Intent i=new Intent(Home.this,ViewAttendance.class);
        startActivity(i);
    }
}

package com.example.attendance;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

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

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

public class Register extends AppCompatActivity {

    FirebaseAuth mAuth;
    EditText emailId,password;

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

        mAuth=FirebaseAuth.getInstance();

        emailId=findViewById(R.id.email);
        password=findViewById(R.id.pass);

    }

    public void register(View view) {

        String EmailId=emailId.getText().toString();
        String Password=password.getText().toString();

        if(TextUtils.isEmpty(EmailId)){
            emailId.setError("Cannot be Empty");
            emailId.requestFocus();
        }
        else if(TextUtils.isEmpty(Password)){
            password.setError("Cannot be Empty");
            password.requestFocus();
        }

        else {
            mAuth.createUserWithEmailAndPassword(EmailId,Password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if(task.isSuccessful())
                    {
                        Toast.makeText(Register.this, "Account registered successfully", Toast.LENGTH_SHORT).show();
                        startActivity(new Intent(Register.this,Home.class));
                    }
                    else{
                        Toast.makeText(Register.this, "Failed", Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    }
}

package com.example.attendance;

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

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

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

public class Login extends AppCompatActivity {

    FirebaseAuth mAuth1;
    EditText emailId1,password1;

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

        mAuth1=FirebaseAuth.getInstance();

        emailId1=findViewById(R.id.email1);
        password1=findViewById(R.id.pass1);
    }

    public void login(View view) {

        String EmailId=emailId1.getText().toString();
        String Password=password1.getText().toString();

        if(TextUtils.isEmpty(EmailId)){
            emailId1.setError("Cannot be Empty");
            emailId1.requestFocus();
        }
        else if(TextUtils.isEmpty(Password)){
            password1.setError("Cannot be Empty");
            password1.requestFocus();
        }

        else {
            mAuth1.signInWithEmailAndPassword(EmailId,Password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if(task.isSuccessful())
                    {
                        Toast.makeText(Login.this, "Logged in successfully", Toast.LENGTH_SHORT).show();
                        startActivity(new Intent(Login.this,Home.class));
                    }
                    else{
                        Toast.makeText(Login.this, "Failed", Toast.LENGTH_SHORT).show();
                    }
                }
            });

        }

    }
}

MainActivity.java

package com.example.attendance;

import androidx.appcompat.app.AppCompatActivity;

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 com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class MainActivity extends AppCompatActivity {

    Button mark,viewattendance;
    EditText name;
    private DatabaseReference mdatabaseReference;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mark=findViewById(R.id.btn);
        viewattendance=findViewById(R.id.btn2);
        name=findViewById(R.id.name);
        mdatabaseReference=FirebaseDatabase.getInstance().getReference();

        mark.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String mname=name.getText().toString();
                mdatabaseReference.child(mname).setValue("Present");
                Toast.makeText(MainActivity.this, "Attendance Marked", Toast.LENGTH_SHORT).show();
            }
        });
        viewattendance.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String mname=name.getText().toString();
                mdatabaseReference.child(mname).setValue("Absent");
                Toast.makeText(MainActivity.this, "Attendance Marked", Toast.LENGTH_SHORT).show();
            }
        });
    }

    public void login(View view) {
        startActivity(new Intent(this,Login.class));
    }
}

ViewAttendance.java

package com.example.attendance;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.google.firebase.database.ChildEventListener;
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 java.util.ArrayList;

public class ViewAttendance extends AppCompatActivity {

    ListView present,absent;
    ArrayList<String> arr1=new ArrayList<>();
    ArrayList<String> arr2=new ArrayList<>();

    DatabaseReference dref;

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

        present=findViewById(R.id.ls1);
        absent=findViewById(R.id.ls2);

        ArrayAdapter arrayAdapter1=new ArrayAdapter(ViewAttendance.this, android.R.layout.simple_list_item_1,arr1);
        ArrayAdapter arrayAdapter2=new ArrayAdapter(ViewAttendance.this, android.R.layout.simple_list_item_1,arr2);

        dref= FirebaseDatabase.getInstance().getReference();
        dref.addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
                String name=snapshot.getKey();
                String status=snapshot.getValue().toString();

                if(status.equalsIgnoreCase("Present")){
                    arr1.add(name);
                    arrayAdapter1.notifyDataSetChanged();
                }
                else {
                    arr2.add(name);
                    arrayAdapter2.notifyDataSetChanged();
                }
            }

            @Override
            public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
                arrayAdapter1.notifyDataSetChanged();
                arrayAdapter2.notifyDataSetChanged();

            }

            @Override
            public void onChildRemoved(@NonNull DataSnapshot snapshot) {

            }

            @Override
            public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {

            }

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

            }
        });
                    present.setAdapter(arrayAdapter1);
                    absent.setAdapter(arrayAdapter2);

    }
}

activity_home.xml

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Login">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/loginpage"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Login"
            android:textColor="#FFFF"
            android:textSize="35sp"
            android:layout_marginTop="65dp"
            android:layout_marginLeft="25dp"/>

        <EditText
            android:id="@+id/email1"
            android:hint="Email"
            android:layout_width="match_parent"
            android:layout_marginTop="150dp"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textEmailAddress" />

        <EditText
            android:id="@+id/pass1"
            android:hint="Password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPassword"
            />
        <Button
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:textColor="#FFFF"
            android:text="Login"
            android:layout_marginTop="30dp"
            android:layout_gravity="center"
            android:onClick="login"
            android:background="@drawable/mybutton"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_marginTop="5dp"
            android:gravity="center"
            >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Not registered yet"/>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:textStyle="bold"
                android:textColor="#448AFF"
                android:text="Register"/>

        </LinearLayout>

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/image"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:onClick="login"
        android:src="@drawable/attendance"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginTop="40dp"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/name"
        android:layout_width="200dp"
        android:layout_height="50dp"
        android:hint="Name"
        android:textSize="20sp"
        app:layout_constraintBottom_toTopOf="@+id/btn"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.511"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/image"
        app:layout_constraintVertical_bias="0.512" />

    <Button
        android:id="@+id/btn"
        android:layout_width="150dp"
        android:layout_height="80dp"
        android:layout_below="@+id/image"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"
        android:gravity="center"
        android:text="Mark Present!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/btn2"
        app:layout_constraintHorizontal_bias="0.421"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/image"
        app:layout_constraintVertical_bias="0.722" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="150dp"
        android:layout_height="80dp"
        android:layout_below="@+id/image"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"
        android:layout_marginEnd="4dp"
        android:gravity="center"
        android:text="Mark Absent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/image"
        app:layout_constraintVertical_bias="0.722" />

</androidx.constraintlayout.widget.ConstraintLayout>

Activity_register.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Register">

    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/loginpage"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Register"
        android:textColor="#FFFF"
        android:textSize="35sp"
        android:layout_marginTop="65dp"
        android:layout_marginLeft="25dp"/>

    <EditText
        android:id="@+id/email"
        android:hint="Email"
        android:layout_width="match_parent"
        android:layout_marginTop="150dp"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textEmailAddress" />

    <EditText
        android:id="@+id/pass"
        android:hint="Password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword"
        />
    <Button
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:textColor="#FFFF"
        android:text="Register"
        android:onClick="register"
        android:layout_marginTop="30dp"
        android:layout_gravity="center"
        android:background="@drawable/mybutton"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="5dp"
        android:gravity="center"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Already registered"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="8dp"
            android:textStyle="bold"
            android:textColor="#448AFF"
            android:text="Login"/>

    </LinearLayout>

</LinearLayout>

    </androidx.constraintlayout.widget.ConstraintLayout>

Activity_view_attendance.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ViewAttendance">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="Present"
        />
    <ListView
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/ls1"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="Absent"
        />
    <ListView
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/ls2"
        />

</LinearLayout>

🠷🠷🠷Source Elements 🠷🠷🠷

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