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만들고 싶은 달력의 모습은 아래와 같다.

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AndroidManifest.xml

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28


    defaultConfig {
        applicationId "com.link2me.android.calendar"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

    }

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

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation files('libs/icu4j-4_8_2.jar')
}


Android 달력 만들기 Layout 구성을 위한 XML 파일 구조다.

전년도, 이전달, 현재 월, 다음달, 다음년도, 특정 년월 검색

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/lightgray"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/buttonlayout"
        android:layout_width="fill_parent"
        android:layout_height="60sp"
        android:background="@drawable/navibar_bg"
        android:gravity="left|top"
        android:height="60sp"
        android:orientation="horizontal" >

        <LinearLayout
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center">

            <ImageView
                android:id="@+id/prevYear"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:layout_gravity="center"
                android:src="@drawable/double_arrow_left" >
            </ImageView>
        </LinearLayout>

        <LinearLayout
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center">
            <ImageView
                android:id="@+id/prevMonth"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:layout_gravity="center"
                android:src="@drawable/arrow_left" >
            </ImageView>
        </LinearLayout>

        <TextView
            android:id="@+id/currentMonth"
            android:layout_width="fill_parent"
            android:layout_height="60sp"
            android:layout_weight="0.6"
            android:gravity="center"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textColor="#FFFFFF" >
        </TextView>

        <LinearLayout
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center">

            <ImageView
                android:id="@+id/nextMonth"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:layout_gravity="center"
                android:src="@drawable/arrow_right" >
            </ImageView>

        </LinearLayout>

        <LinearLayout
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center">
            <ImageView
                android:id="@+id/nextYear"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:layout_gravity="center"
                android:src="@drawable/double_arrow_right" >
            </ImageView>
        </LinearLayout>

        <LinearLayout
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:gravity="center">
            <ImageView
                android:id="@+id/selectDate"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:layout_gravity="center"
                android:src="@drawable/box_arrow" >
            </ImageView>
        </LinearLayout>

    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="30dp"
        android:background="#e0e7ee"
        android:gravity="center"
        android:orientation="horizontal">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="일"
            android:textColor="#ff0000"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="월"
            android:textColor="#969a9b"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="화"
            android:textColor="#969a9b"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="수"
            android:textColor="#969a9b"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="목"
            android:textColor="#969a9b"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="금"
            android:textColor="#969a9b"
            android:textSize="14sp"
            android:textStyle="bold" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="토"
            android:textColor="#ff0000"
            android:textSize="14sp"
            android:textStyle="bold" />
    </LinearLayout>

    <GridView
        android:id="@+id/calendar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:numColumns="7" >
    </GridView>

</LinearLayout>


select_calendar_input.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:text="년도"
            android:layout_marginLeft="20dp"
            android:textSize="12sp" />

        <EditText
            android:id="@+id/selectYear"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:layout_marginRight="20dp"
            android:singleLine="true"
            android:inputType="number"
            android:textSize="16sp"
            android:textColor="#000000" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:text="월(月)"
            android:textSize="12sp" />

        <EditText
            android:id="@+id/selectMonth"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:layout_marginRight="20dp"
            android:singleLine="true"
            android:inputType="number"
            android:textSize="16sp"
            android:textColor="#000000" />

    </LinearLayout>
</LinearLayout>


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