Create your Firebase Realtime database Calendar App to store events or reminders? – Android 13 API 33

In this video it shows the steps to create your firebase database based Calendar App. This App can be used to store your reminders or events in your firebase database.

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Complete source code and other details:

package com.programmerworld.firebasecalendarapp;

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

import android.os.Bundle;
import android.view.View;
import android.widget.CalendarView;
import android.widget.EditText;

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;

public class MainActivity extends AppCompatActivity {

    private CalendarView calendarView;
    private EditText editText;
    private String stringDateSelected;
    private DatabaseReference databaseReference;

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

        calendarView = findViewById(R.id.calendarView);
        editText = findViewById(R.id.editText);

        calendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
            @Override
            public void onSelectedDayChange(@NonNull CalendarView calendarView, int i, int i1, int i2) {
                stringDateSelected = Integer.toString(i) + Integer.toString(i1+1) + Integer.toString(i2);
                calendarClicked();
            }
        });
        databaseReference = FirebaseDatabase.getInstance().getReference("Calendar");
    }

    private void calendarClicked(){
        databaseReference.child(stringDateSelected).addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                if (snapshot.getValue() != null){
                    editText.setText(snapshot.getValue().toString());
                }else {
                    editText.setText("null");
                }
            }

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

    public void buttonSaveEvent(View view){
        databaseReference.child(stringDateSelected).setValue(editText.getText().toString());
    }
}

<?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">

    <CalendarView
        android:id="@+id/calendarView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="30dp"
        android:layout_marginTop="3dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="230dp"
        android:layout_height="63dp"
        android:layout_marginStart="21dp"
        android:layout_marginTop="17dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Name"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/calendarView" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="18dp"
        android:layout_marginTop="22dp"
        android:onClick="buttonSaveEvent"
        android:text="Save Event"
        app:layout_constraintStart_toEndOf="@+id/editText"
        app:layout_constraintTop_toBottomOf="@+id/calendarView" />

</androidx.constraintlayout.widget.ConstraintLayout>

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        // Make sure that you have the following two repositories
        google()  // Google's Maven repository
        mavenCentral()  // Maven Central repository

    }
    dependencies {
        // Add the dependency for the Google services Gradle plugin
        classpath 'com.google.gms:google-services:4.3.13'

    }
}


plugins {
    id 'com.android.application' version '7.4.0' apply false
    id 'com.android.library' version '7.4.0' apply false
}

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services'
}

android {
    namespace 'com.programmerworld.firebasecalendarapp'
    compileSdk 33

    defaultConfig {
        applicationId "com.programmerworld.firebasecalendarapp"
        minSdk 33
        targetSdk 33
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.6.0'
    implementation 'com.google.android.material:material:1.7.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'

    implementation platform('com.google.firebase:firebase-bom:31.1.1')

    implementation 'com.google.firebase:firebase-firestore'
    implementation 'com.google.firebase:firebase-database'
    implementation 'com.google.firebase:firebase-messaging'

}

pluginManagement {
    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
    }
}
rootProject.name = "Firebase Calendar App"
include ':app'