Add Repository solution code

RepositoryPattern/README.md

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+DevByteRepository - Solution Code
+==================================
+
+Solution code for the Repository codelab.
+
+Introduction
+------------
+
+DevByteRepository app displays a list of DevByte videos. DevByte videos are
+short videos made by the Google Android developer relations team to introduce
+new developer features on Android. This app demonstrates the Repository pattern,
+the recommended best practice for code separation and architecture. Using
+repository pattern the data layer is abstracted from the rest of the app.
+Repositories act as mediators between different data sources, such as persistent
+models, web services, and caches and the rest of the app.
+
+Pre-requisites
+--------------
+
+You need to know:
+- How to open, build, and run Android apps with Android Studio.
+- The basic Android Architecture Components, ViewModel, and LiveData.
+- The data persistence library, Room.
+- Building and launching a coroutine.
+- Read the logs using the Logcat.
+- Binding adapters in data binding.
+- Using the Retrofit networking library.
+
+
+Getting Started
+---------------
+
+1. Download and run the app.
+2. You need Android Studio 3.4 or higher to build this project.
+
+License
+-------
+
+Copyright 2019 Google, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License.  You may obtain a copy of
+the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+License for the specific language governing permissions and limitations under
+the License.

RepositoryPattern/app/build.gradle

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+/*
+ * Copyright (C) 2019 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-kapt'
+apply plugin: "androidx.navigation.safeargs"
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 32
+    defaultConfig {
+        applicationId "com.example.android.devbyteviewer"
+        minSdkVersion 19
+        targetSdkVersion 32
+        versionCode 1
+        versionName "1.0"
+        vectorDrawables.useSupportLibrary = true
+        multiDexEnabled true
+    }
+    buildTypes {
+        release {
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    buildFeatures {
+        dataBinding true
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8.toString()
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+
+    // support libraries
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'com.google.android.material:material:1.5.0'
+
+    // Android KTX
+    implementation 'androidx.core:core-ktx:1.7.0'
+
+    // constraint layout
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+
+    // navigation
+    def nav_version = "1.0.0"
+    implementation "android.arch.navigation:navigation-fragment-ktx:$nav_version"
+    implementation "android.arch.navigation:navigation-ui-ktx:$nav_version"
+
+    // coroutines for getting off the UI thread
+    def coroutines = "1.6.0"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines"
+
+    // retrofit for networking
+    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
+    implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:0.9.2'
+    implementation 'com.squareup.retrofit2:converter-moshi:2.9.0'
+
+    // moshi for parsing the JSON format
+    def moshi_version = "1.13.0"
+    implementation "com.squareup.moshi:moshi:$moshi_version"
+    implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
+    kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
+
+    // joda time library for dealing with time
+    implementation 'joda-time:joda-time:2.10'
+
+    // arch components
+    // ViewModel and LiveData
+    def lifecycle_version = "2.4.1"
+//    implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+
+    // logging
+    implementation 'com.jakewharton.timber:timber:4.7.1'
+
+    // glide for images
+    implementation 'com.github.bumptech.glide:glide:4.8.0'
+    kapt 'com.github.bumptech.glide:compiler:4.7.1'
+
+    // Room dependency
+    def room_version = "2.4.1"
+    implementation "androidx.room:room-runtime:$room_version"
+    kapt "androidx.room:room-compiler:$room_version"
+
+}

RepositoryPattern/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

RepositoryPattern/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2019 Google Inc.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.example.android.devbyteviewer">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:name=".DevByteApplication"
+        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/AppTheme"
+        tools:ignore="GoogleAppIndexingWarning">
+        <activity android:name=".ui.DevByteActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

RepositoryPattern/app/src/main/java/com/example/android/devbyteviewer/DevByteApplication.kt

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+/*
+ * Copyright (C) 2019 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.devbyteviewer
+
+import android.app.Application
+import timber.log.Timber
+
+/**
+ * Override application to setup background work via WorkManager
+ */
+class DevByteApplication : Application() {
+
+    /**
+     * onCreate is called before the first screen is shown to the user.
+     *
+     * Use it to setup any background tasks, running expensive setup operations in a background
+     * thread to avoid delaying app start.
+     */
+    override fun onCreate() {
+        super.onCreate()
+        Timber.plant(Timber.DebugTree())
+    }
+}

RepositoryPattern/app/src/main/java/com/example/android/devbyteviewer/database/DatabaseEntities.kt

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+/*
+ * Copyright (C) 2019 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.devbyteviewer.database
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import com.example.android.devbyteviewer.domain.DevByteVideo
+
+
+/**
+ * Database entities go in this file. These are responsible for reading and writing from the
+ * database.
+ */
+
+
+/**
+ * DatabaseVideo represents a video entity in the database.
+ */
+@Entity
+data class DatabaseVideo constructor(
+        @PrimaryKey
+        val url: String,
+        val updated: String,
+        val title: String,
+        val description: String,
+        val thumbnail: String)
+
+
+/**
+ * Map DatabaseVideos to domain entities
+ */
+fun List<DatabaseVideo>.asDomainModel(): List<DevByteVideo> {
+        return map {
+                DevByteVideo(
+                        url = it.url,
+                        title = it.title,
+                        description = it.description,
+                        updated = it.updated,
+                        thumbnail = it.thumbnail)
+        }
+}

RepositoryPattern/app/src/main/java/com/example/android/devbyteviewer/database/Room.kt

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+/*
+ * Copyright (C) 2019 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.devbyteviewer.database
+
+import android.content.Context
+import androidx.lifecycle.LiveData
+import androidx.room.*
+
+@Dao
+interface VideoDao {
+    @Query("select * from databasevideo")
+    fun getVideos(): LiveData<List<DatabaseVideo>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun insertAll( videos: List<DatabaseVideo>)
+}
+
+
+
+@Database(entities = [DatabaseVideo::class], version = 1)
+abstract class VideosDatabase: RoomDatabase() {
+    abstract val videoDao: VideoDao
+}
+
+private lateinit var INSTANCE: VideosDatabase
+
+fun getDatabase(context: Context): VideosDatabase {
+    synchronized(VideosDatabase::class.java) {
+        if (!::INSTANCE.isInitialized) {
+            INSTANCE = Room.databaseBuilder(context.applicationContext,
+                    VideosDatabase::class.java,
+                    "videos").build()
+        }
+    }
+    return INSTANCE
+}