Horizontal CalendarView in Android

05 May, 2021
If we are making an application that provides services such as booking flights, movie tickets, or others we generally have to implement a calendar in our application. We have to align the calendar in such a way so that it will look better and will take less amount of space in the mobile app. Most of the apps prefer to use Horizontal Calendar View inside their which looks better than the normal calendar. In this article, we will take a look at implementing a similar calendar in our app. 
We will be building a simple application in which we will be simply creating a horizontal calendar and we will be displaying the whole dates of the month in it. We will be displaying these dates in the horizontal Calendar View. A sample GIF is given below to get an idea about what we are going to do in this article. Note that we are going to implement this project using the Java language. 
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.
Step 2: Add dependency
Navigate to the Gradle Scripts > build.gradle(Module:app) and add the below dependency in the dependencies section.   
implementation ‘devs.mulham.horizontalcalendar:horizontalcalendar:1.3.4’
Step 3: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. 
XML
<?xml version="1.0" encoding="utf-8"?><RelativeLayout     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">      <!--on below line we are creating our calendar view        selector color is use as a indicator for selected date        text color normal is use to give text color to unselected date        text color selected is use to give text color to selected date-->    <devs.mulham.horizontalcalendar.HorizontalCalendarView        android:id="@+id/calendarView"        android:layout_width="match_parent"        android:layout_height="wrap_content"        app:selectorColor="@android:color/holo_red_dark"        app:textColorNormal="@color/purple_200"        app:textColorSelected="@color/purple_200" />  </RelativeLayout>
Step 4: Working with the MainActivity.java file
Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.
Java
import android.os.Bundle;import android.util.Log;  import androidx.appcompat.app.AppCompatActivity;  import java.util.Calendar;  import devs.mulham.horizontalcalendar.HorizontalCalendar;import devs.mulham.horizontalcalendar.utils.HorizontalCalendarListener;  public class MainActivity extends AppCompatActivity {      @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                  /* starts before 1 month from now */        Calendar startDate = Calendar.getInstance();        startDate.add(Calendar.MONTH, -1);                  /* ends after 1 month from now */        Calendar endDate = Calendar.getInstance();        endDate.add(Calendar.MONTH, 1);                  // on below line we are setting up our horizontal calendar view and passing id our calendar view to it.        HorizontalCalendar horizontalCalendar = new HorizontalCalendar.Builder(this, R.id.calendarView)                // on below line we are adding a range                 // as start date and end date to our calendar.                .range(startDate, endDate)                // on below line we are providing a number of dates                // which will be visible on the screen at a time.                .datesNumberOnScreen(5)                // at last we are calling a build method                 // to build our horizontal recycler view.                .build();        // on below line we are setting calendar listener to our calendar view.        horizontalCalendar.setCalendarListener(new HorizontalCalendarListener() {            @Override            public void onDateSelected(Calendar date, int position) {                // on below line we are printing date                 // in the logcat which is selected.                Log.e("TAG", "CURRENT DATE IS " + date);            }        });    }}
Now run your app and see the output of the app. 
Output:
Android-Date-time
Android
Java
Java
Android
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