[Android Studio/Kotlin] Time Picker, Saving Data

[안드로이드 스튜디오/코틀린] 선택 도구, 데이터 저장하기

TimePicker

build.gradle (:app)

plugins {
    id 'com.android.application'
    id 'kotlin-android'
}

android {
    compileSdk 32

    defaultConfig {
        applicationId "com.shinyelee.android_study2"
        minSdk 23 // TimePicker 사용하기 위해 21에서 23으로 높여줌
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

        // app:srcCompat 에러 제거용
        vectorDrawables.useSupportLibrary = true
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    // 뷰바인딩
    buildFeatures {
        viewBinding true
    }
}

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

}

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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

package com.shinyelee.android_study2

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.shinyelee.android_study2.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private var vBinding : ActivityMainBinding? = null
    private val binding get() = vBinding!!

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        vBinding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        // i는 시, i2는 분
        binding.timePicker.setOnTimeChangedListener { timePicker, i, i2 ->
            println(i.toString() + ":" + i2.toString())
        }

    }

    override fun onDestroy() {
        vBinding = null
        super.onDestroy()
    }

}

기본값은 clock 모드임

키보드 아이콘을 클릭해

키패드로 숫자를 직접 입력해도 됨

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

    <!-- 생략 -->

    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:timePickerMode="spinner"/>
    <!-- spinner 모드로 바꾸면 time picker의 형태가 변함 -->

</androidx.constraintlayout.widget.ConstraintLayout>

spinner 모드

---

Saving Data

MainActivity.kt

package com.shinyelee.android_study2

import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.shinyelee.android_study2.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private var vBinding : ActivityMainBinding? = null
    private val binding get() = vBinding!!

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        vBinding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val pref = getSharedPreferences("pref", Context.MODE_PRIVATE)
        
        // 저장
        pref.edit().putString("키", "값").apply()
        
        // 불러오기
        val value = pref.getString("키", "저장안됨")
        
        // 키 제거
        pref.edit().remove("키").apply()
        
        // 전체 제거
        pref.edit().clear().apply()

    }

    override fun onDestroy() {
        vBinding = null
        super.onDestroy()
    }

}

---

참고