3rd edition

Firebase/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

Firebase/app/.gitignore

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+/build

Firebase/app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    id 'com.google.gms.google-services'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "net.flow9.thisiskotlin.firebase"
+        minSdk 21
+        targetSdk 31
+        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
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+    // 두 줄 추가
+    implementation platform('com.google.firebase:firebase-bom:29.0.0')
+    implementation 'com.google.firebase:firebase-analytics-ktx'
+    // Realtime Database
+    implementation 'com.google.firebase:firebase-database-ktx'
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

Firebase/app/google-services.json

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+{
+  "project_info": {
+    "project_number": "304871030893",
+    "firebase_url": "https://this-is-android-with-kot-df246-default-rtdb.asia-southeast1.firebasedatabase.app",
+    "project_id": "this-is-android-with-kot-df246",
+    "storage_bucket": "this-is-android-with-kot-df246.appspot.com"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:304871030893:android:7934b217728bb20e88bf64",
+        "android_client_info": {
+          "package_name": "net.flow9.thisiskotlin.firebase"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "304871030893-ab02iq9kro1lb0hsd0lj0k7rfeupjvr8.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyDtpT4MZVMAlu7tqzTsqsdiLW8iCIuvINg"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": [
+            {
+              "client_id": "304871030893-ab02iq9kro1lb0hsd0lj0k7rfeupjvr8.apps.googleusercontent.com",
+              "client_type": 3
+            }
+          ]
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:304871030893:android:3be7ad65a6cd1aa088bf64",
+        "android_client_info": {
+          "package_name": "net.flow9.thisiskotlin.firebasechat"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "304871030893-ab02iq9kro1lb0hsd0lj0k7rfeupjvr8.apps.googleusercontent.com",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "AIzaSyDtpT4MZVMAlu7tqzTsqsdiLW8iCIuvINg"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": [
+            {
+              "client_id": "304871030893-ab02iq9kro1lb0hsd0lj0k7rfeupjvr8.apps.googleusercontent.com",
+              "client_type": 3
+            }
+          ]
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}

Firebase/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

Firebase/app/src/androidTest/java/net/flow9/thisiskotlin/firebase/ExampleInstrumentedTest.kt

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+package net.flow9.thisiskotlin.firebase
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.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.getInstrumentation().targetContext
+        assertEquals("net.flow9.thisiskotlin.firebase", appContext.packageName)
+    }
+}

Firebase/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="net.flow9.thisiskotlin.firebase">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Firebase">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

Firebase/app/src/main/java/net/flow9/thisiskotlin/firebase/MainActivity.kt

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+package net.flow9.thisiskotlin.firebase
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.util.Log
+import com.google.firebase.database.*
+import com.google.firebase.database.ktx.database
+import com.google.firebase.ktx.Firebase
+import net.flow9.thisiskotlin.firebase.databinding.ActivityMainBinding
+
+class MainActivity : AppCompatActivity() {
+
+    val database = Firebase.database("https://this-is-android-with-kot-df246-default-rtdb.asia-southeast1.firebasedatabase.app")
+    val myRef  = database.getReference("users")
+
+    val binding by lazy { ActivityMainBinding.inflate(layoutInflater)}
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(binding.root)
+
+        with(binding){
+            btnPost.setOnClickListener {
+                val name = editName.text.toString()
+                val password = editPassword.text.toString()
+                val user = User(name, password)
+                addItem(user)
+            }
+        }
+
+        myRef.addValueEventListener( object: ValueEventListener {
+            override fun onDataChange(snapshot: DataSnapshot) {
+                // 먼저 textList를 지운다
+                with(binding) {
+                    textList.setText("")
+                    for (item in snapshot.children) {
+                        item.getValue(User::class.java)?.let { user ->
+                            textList.append("${user.name} : ${user.password} \n")
+                        }
+                    }
+                }
+
+            }
+
+            override fun onCancelled(error: DatabaseError) {
+                print(error.message)
+            }
+        })
+
+        // write()
+        // readOnce()
+        // readData()
+    }
+    // 목록 형태로 추가하기
+    fun addItem(user:User) {
+        val id = myRef.push().key!!
+        user.id = id
+        myRef.child(id).setValue(user)
+    }
+    // 계속 읽기
+    fun readData() {
+        myRef.child("name").addValueEventListener( object: ValueEventListener {
+            override fun onDataChange(snapshot: DataSnapshot) {
+                Log.d("파이어베이스", "${snapshot.value}")
+                print( snapshot.value ) // 값이 변경 될때마다 매번 호출
+            }
+            override fun onCancelled(error: DatabaseError) {
+                print( error.message )
+            }
+        })
+    }
+    // 한번 읽기
+    fun readOnce() {
+        myRef.child("name").get().addOnSuccessListener {
+            Log.d("파이어베이스", "name=${it.value}") // 한 번 호출
+        }.addOnFailureListener {
+            Log.d("파이어베이스", "error=${it}")
+        }
+    }
+    // 쓰기
+    fun write() {
+        myRef.child("name").setValue("Scott")
+        myRef.child("age").setValue(19)
+    }
+}
+
+
+class User {
+    var id:String = ""
+    var name:String = ""
+    var password:String = ""
+
+    constructor() // 파이어베이스에서 데이터 변환을 위해서 필요
+
+    constructor(name:String, password:String) {
+        this.name = name
+        this.password = password
+    }
+}