[Android] Adding support for the products endpoint

.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

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+apply plugin: 'kotlin-kapt'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "android.sample.wavechallenge"
+        minSdkVersion 19
+        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'
+        }
+    }
+
+    buildTypes.each {
+        Properties properties = new Properties()
+        properties.load(project.rootProject.file("local.properties").newDataInputStream())
+        def waveApiKey = properties.getProperty("wave_api_key", "")
+        it.buildConfigField 'String', "WAVE_API_KEY", waveApiKey
+        it.resValue 'string', "api_key", waveApiKey
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.1.0-alpha03'
+    implementation 'androidx.core:core-ktx:1.1.0-alpha05'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+
+    //Retrofit
+    implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"
+    implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
+    implementation "com.squareup.retrofit2:retrofit-mock:$retrofitVersion"
+    implementation "com.squareup.okhttp3:logging-interceptor:$okhttpLoggingInterceptorVersion"
+
+    //RecyclerView
+    implementation 'com.android.support:recyclerview-v7:28.0.0'
+
+    //Navigation
+    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version" // For Kotlin use navigation-fragment-ktx
+    implementation "androidx.navigation:navigation-ui-ktx:$nav_version" // For Kotlin use navigation-ui-ktx
+
+    //Kotlin Coroutines
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlinCoroutineVersion"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlinCoroutineVersion"
+    implementation "com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:0.9.2"
+
+    implementation "android.arch.lifecycle:extensions:$lifecycleVersion"
+    implementation "androidx.lifecycle:lifecycle-common:$lifecycleVersion"
+    annotationProcessor "android.arch.lifecycle:compiler:1.1.1"
+    implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycleVersion"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.1.0-alpha03"
+
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.1.2-alpha02'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0-alpha02'
+}

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

app/src/androidTest/java/android/sample/wavechallenge/ExampleInstrumentedTest.kt

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+package android.sample.wavechallenge
+
+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("android.sample.wavechallenge", appContext.packageName)
+    }
+}

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"
+          xmlns:tools="http://schemas.android.com/tools"
+          package="android.sample.wavechallenge">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <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/AppTheme" tools:ignore="GoogleAppIndexingWarning">
+        <activity android:name=".ui.MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/android/sample/wavechallenge/Constants.kt

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+package android.sample.wavechallenge
+
+object Constants {
+    const val WAVE_API_KEY = BuildConfig.WAVE_API_KEY
+
+    const val WAVE_API_URL = "https://api.waveapps.com/"
+}

app/src/main/java/android/sample/wavechallenge/adapter/ProductListAdapter.kt

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+package android.sample.wavechallenge.adapter
+
+import android.content.Context
+import android.sample.wavechallenge.R
+import android.sample.wavechallenge.model.Product
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import kotlinx.android.synthetic.main.item_product_layout.view.*
+
+class ProductListAdapter(
+    private var context: Context?,
+    private var itemList: List<Product>?
+) : RecyclerView.Adapter<ProductListAdapter.ItemViewHolder>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder {
+        val view = LayoutInflater.from(context).inflate(R.layout.item_product_layout, parent, false)
+        return ItemViewHolder(view)
+    }
+
+    override fun getItemCount(): Int {
+        return itemList?.size ?: 0
+    }
+
+    override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
+        val product = itemList?.get(position)
+        product?.let {
+            holder.tvName.text = product.name
+            holder.tvPrice.text = context?.getString(R.string.formatted_price, product.price.toString())
+        }
+    }
+
+    fun updateItems(products: List<Product>) {
+        itemList = listOf()
+        itemList = products
+        notifyDataSetChanged()
+    }
+
+    class ItemViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        var tvName: TextView = view.tv_name
+        var tvPrice: TextView = view.tv_price
+    }
+}

app/src/main/java/android/sample/wavechallenge/api/ApiFactory.kt

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+package android.sample.wavechallenge.api
+
+import android.sample.wavechallenge.Constants
+import com.jakewharton.retrofit2.adapter.kotlin.coroutines.CoroutineCallAdapterFactory
+import okhttp3.Interceptor
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+
+object ApiFactory {
+
+    private val authInterceptor = Interceptor { chain ->
+        val newRequest = chain.request()
+            .newBuilder()
+            .addHeader("Authorization", "Bearer " + Constants.WAVE_API_KEY)
+            .build()
+
+        chain.proceed(newRequest)
+    }
+
+    private val logger = HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BASIC)
+
+    private val waveClient = OkHttpClient().newBuilder()
+        .addInterceptor(logger)
+        .addInterceptor(authInterceptor)
+        .build()
+
+
+    private fun retrofit(): Retrofit = Retrofit.Builder()
+        .client(waveClient)
+        .baseUrl(Constants.WAVE_API_URL)
+        .addConverterFactory(GsonConverterFactory.create())
+        .addCallAdapterFactory(CoroutineCallAdapterFactory())
+        .build()
+
+
+    val waveApi: WaveApi = retrofit().create(WaveApi::class.java)
+}

app/src/main/java/android/sample/wavechallenge/api/Exceptions.kt

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+package android.sample.wavechallenge.api
+
+open class DataSourceException(message: String? = null) : Exception(message)
+
+class RemoteDataNotFoundException : DataSourceException("Data not found from the remote source")

app/src/main/java/android/sample/wavechallenge/api/WaveApi.kt

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+package android.sample.wavechallenge.api
+
+import android.sample.wavechallenge.model.Product
+import kotlinx.coroutines.Deferred
+import retrofit2.http.GET
+import retrofit2.http.Path
+
+//A retrofit Network Interface for the Wave Api
+interface WaveApi{
+    @GET("businesses/{business_id}/products/")
+    fun getProductsAsync(@Path("business_id") businessId: String): Deferred<List<Product>>
+}