7주차 자료

7weeks/.gitignore

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+# OS files
+.DS_Store
+
+# Built application files
+*.apk
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+release/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea
+
+# Keystore files
+# Uncomment the following lines if you do not want to check your keystore files in.
+#*.jks
+#*.keystore
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+
+# Google Services (e.g. APIs or Firebase)
+# google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+
+# Version control
+vcs.xml
+
+# lint
+lint/intermediates/
+lint/generated/
+lint/outputs/
+lint/tmp/
+# lint/reports/

7weeks/README.md

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+## ViewGroup
+
+- Android의 모든 위젯은 View를 상속하여 구현하고 있다.
+
+  ![View hierarchy](https://o7planning.org/en/10423/cache/images/i/1189616.png)
+
+### 주요 ViewGroup 종류와 사용법
+
+#### LinearLayout
+
+- 명칭에서 알 수 있듯이 선형 모양의 레이아웃
+- `orientation` 이라는 필수 속성이 필요하며 지정하지 않을 경우 `horizontal` 이 기본
+
+```xml
+<LinearLayout
+    android:layout_width="match_parent|wrap_content"
+    android:layout_height="match_parent|wrap_content"
+    android:orientation="vertical|horizontal">
+    <!-- other code -->
+</LinearLayout>
+```
+
+#### RelativeLayout
+
+- 부모 또는 특정 View를 기준으로 특정 View의 상대 위치를 지정할 수 있는 레이아웃
+
+```xml
+<RelativeLayout
+    android:layout_width="match_parent|wrap_content"
+    android:layout_height="match_parent|wrap_content">
+
+    <TextView
+        android:id="@+id/textView1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <TextView
+        android:id="@+id/textView2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_toRightOf="@id/textView1" />
+    <!-- other code -->
+</RelativeLayout>
+```
+
+#### FrameLayout
+
+- 하나의 View 위젯을 표현하기 위한 레이아웃
+- 단, 레이아웃 하위에 여러 View 위젯을 추가할 순 있다.
+
+```xml
+<FrameLayout
+    android:layout_width="match_parent|wrap_content"
+    android:layout_height="match_parent|wrap_content">
+
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:src="@drawable/abc" />
+    <!-- other code -->
+</FrameLayout>
+```
+
+#### ConstraintLayout
+
+- 뷰와 뷰 사이에 제약조건을 설정하여 위젯을 배치하기 위한 레이아웃
+- 속성이 엄청나게 많습니다. ~~(알아서 찾아보세요...)~~
+
+```xml
+<androidx.constraintlayout.widget.ConstraintLayout
+    android:layout_width="match_parent|wrap_content"
+    android:layout_height="match_parent|wrap_content">
+
+    <TextView
+        android:id="@+id/textView1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+    <!-- other code -->
+</androidx.constraintlayout.widget.ConstraintLayout>
+```
+
+### 주요 Widget 종류와 사용법
+
+#### RecyclerView
+
+- 기존의 ListView의 단점과 성능을 개선하여 제공되는 위젯
+- ViewHolder 패턴을 강제하여 아이템 View의 재사용성을 적극 활용한다.
+
+```xml
+<RecyclerView
+    android:id="@+id/exampleList"
+    android:layout_width="match_parent|wrap_content"
+    android:layout_height="match_parent|wrap_content" />
+```
+
+```kotlin
+fun setupRecyclerView() {
+    ExampleAdapter adapter = new ExampleAdapter()
+    LinearLayoutManager layoutManager = new LayoutManager(this)
+    with(exampleList) {
+        this.layoutManager = layoutManager
+        this.adapter = adpater
+    }
+}
+```
+
+```kotlin
+class ExampleAdapter : RecyclerView.Adapter<ExampleHolder>() {
+    private var dataSet = mutableListOf<String>()
+
+    fun addItems(items: List<String>) {
+        dataSet.addAll(items)
+        notifyDataSetChanged()
+    }
+
+    fun updateItems(items: List<String>) {
+        dataSet = items as MutableList<String>
+        notifyDataSetChanged()
+    }
+
+    class ExampleHolder(val containerView: View) : RecyclerView.ViewHolder(view) {
+        // other code
+    }
+
+
+  abstract class LayoutContainerViewHolder(override val containerView: View) : RecyclerView.ViewHolder(containerView)
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ExampleHolder {
+        return ExampleHolder(
+          LayoutInflater.from(parent.context).inflate(R.layout.item_example, parent, false)
+        )
+    }
+
+    override fun onBindViewHolder(holder: ExampleHolder, position: Int) {
+        // otehr code...
+    }
+
+    override fun getItemCount(): Int = dataSet.size
+}
+```
+
+#### ViewPager
+
+- 스와이프 액션을 통해 화면을 이동하기 위한 위젯
+- ~~샘플 코드 귀찮아요...~~
+
+```xml
+<android.support.v4.view.ViewPager
+    android:id="@+id/examplePager"
+    android:layout_width="match_parent|wrap_content"
+    android:layout_height="match_parent|wrap_content" />
+```
+

7weeks/app/.gitignore

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+/build

7weeks/app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 28
+    buildToolsVersion "29.0.0"
+    defaultConfig {
+        applicationId "io.cro.example"
+        minSdkVersion 21
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+
+    implementation 'androidx.core:core-ktx:1.0.2'
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+
+    implementation 'com.squareup.retrofit2:retrofit:2.6.1'
+    implementation 'com.squareup.retrofit2:converter-gson:2.6.1'
+
+    implementation 'com.google.code.gson:gson:2.8.5'
+
+    implementation 'com.jakewharton.timber:timber:4.7.1'
+
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}

7weeks/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

7weeks/app/src/androidTest/java/io/cro/example/ExampleInstrumentedTest.kt

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+package io.cro.example
+
+import androidx.test.InstrumentationRegistry
+import androidx.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+        assertEquals("io.cro.example", appContext.packageName)
+    }
+}

7weeks/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="io.cro.example">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:name=".ExampleApplication"
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".RetrofitActivity"></activity>
+        <activity android:name=".LegacyActivity" />
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

7weeks/app/src/main/java/io/cro/example/ExampleApplication.kt

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+package io.cro.example
+
+import android.app.Application
+import timber.log.Timber
+
+class ExampleApplication : Application() {
+    override fun onCreate() {
+        super.onCreate()
+        Timber.plant(Timber.DebugTree())
+    }
+}