Cars loader test project

.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'
+
+android {
+    compileSdkVersion 27
+    defaultConfig {
+        applicationId "com.cars"
+        minSdkVersion 16
+        targetSdkVersion 27
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    testOptions {
+        unitTests.returnDefaultValues = true
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support:recyclerview-v7:27.1.1'
+    testImplementation 'junit:junit:4.12'
+    testImplementation 'org.json:json:20180130'
+    testImplementation 'org.assertj:assertj-core:3.11.1'
+    testImplementation 'org.mockito:mockito-core:2.23.0'
+    testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.1.0"
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+
+    implementation "io.reactivex.rxjava2:rxandroid:2.1.1"
+    implementation "io.reactivex.rxjava2:rxjava:2.2.8"
+    implementation "com.squareup.okhttp3:okhttp:3.12.1"
+}

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/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="com.cars">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <application
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name"
+            android:roundIcon="@mipmap/ic_launcher_round"
+            android:supportsRtl="true"
+            android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity"
+                  android:launchMode="singleTask">
+            <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/com/cars/Contract.kt

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+package com.cars
+
+import android.content.Context
+import com.cars.model.DataModel
+
+interface Contract {
+    interface Presenter<T> {
+        fun reload()
+        fun loadNext()
+        fun canLoadMore(): Boolean
+        fun isLoading(): Boolean
+        fun getDataSet(): List<T>
+
+        fun onCreate()
+        fun onDestroy()
+        fun onViewCreated(view: View<T>)
+        fun onDestroyView()
+
+        fun onItemClicked(context: Context, item: DataModel)
+    }
+
+    interface View<T> {
+        fun updateGlobalLoader(loading: Boolean)
+        fun updatePageLoader(loading: Boolean)
+        fun onError(throwable: Throwable)
+        fun onNewDataSet()
+    }
+}

app/src/main/java/com/cars/MainActivity.kt

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+package com.cars
+
+import android.content.Intent
+import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
+import android.view.MenuItem
+import com.cars.view.CarFragment
+import com.cars.view.ManufacturerFragment
+import com.cars.view.ModelFragment
+import com.cars.view.YearFragment
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        setContentView(R.layout.activity_main)
+        if (savedInstanceState == null) {
+            supportFragmentManager
+                .beginTransaction()
+                .replace(R.id.content_view, ManufacturerFragment())
+                .commit()
+        }
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (item.itemId == android.R.id.home) {
+            if (supportFragmentManager.backStackEntryCount > 0) {
+                supportFragmentManager.popBackStack()
+            } else {
+                super.onBackPressed()
+            }
+        }
+        return true
+    }
+
+    override fun onNewIntent(intent: Intent?) {
+        super.onNewIntent(intent)
+        intent?.apply {
+            val fragment = when (getIntExtra(FRAGMENT, 0)) {
+                MODEL_FRAGMENT -> ModelFragment()
+                YEAR_FRAGMENT -> YearFragment()
+                CAR_FRAGMENT -> CarFragment()
+                else -> return
+            }
+
+            getBundleExtra(DATA_BUNDLE)?.let { data ->
+                fragment.arguments = data
+                supportFragmentManager
+                    .beginTransaction()
+                    .setCustomAnimations(
+                        R.animator.right_in, R.animator.right_out,
+                        R.animator.left_in, R.animator.left_out
+                    )
+                    .replace(R.id.content_view, fragment)
+                    .addToBackStack(null)
+                    .commit()
+            }
+        }
+    }
+
+    companion object {
+        const val DATA_BUNDLE = "data"
+        const val FRAGMENT = "fragment"
+        const val MODEL_FRAGMENT = 100
+        const val YEAR_FRAGMENT = 101
+        const val CAR_FRAGMENT = 102
+    }
+}

app/src/main/java/com/cars/adapter/Adapter.kt

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+package com.cars.adapter
+
+import android.support.v7.widget.RecyclerView
+import android.view.View
+import android.view.ViewGroup
+import com.cars.R
+import com.cars.holder.CarsItemViewHolder
+import com.cars.holder.ProgressItemViewHolder
+import com.cars.model.DataModel
+
+class Adapter<T: DataModel>(private val clickListener: View.OnClickListener)
+    : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+
+    val dataSet = ArrayList<T>()
+    private var loadingMode = false
+
+    fun setLoadingMode(loading: Boolean) {
+        if (loadingMode != loading) {
+            loadingMode = loading
+            notifyItemChanged(itemCount)
+        }
+    }
+
+    override fun getItemViewType(position: Int): Int {
+        return if (loadingMode && position == itemCount - 1) VIEW_TYPE_PROGRESS
+        else if (position % 2 == 0) VIEW_TYPE_EVEN else VIEW_TYPE_ODD
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+        return when (viewType) {
+            VIEW_TYPE_ODD -> CarsItemViewHolder(parent, clickListener, R.color.cars_view_item_background_transparent)
+            VIEW_TYPE_EVEN -> CarsItemViewHolder(parent, clickListener, R.color.cars_view_item_background_colored)
+            else -> ProgressItemViewHolder(parent)
+        }
+    }
+
+    override fun getItemCount(): Int = dataSet.size + (if (loadingMode) 1 else 0)
+
+    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+        when (holder.itemViewType) {
+            VIEW_TYPE_ODD,
+            VIEW_TYPE_EVEN -> (holder as CarsItemViewHolder).bind(dataSet[position])
+            else -> {}
+        }
+    }
+
+    companion object {
+        const val VIEW_TYPE_PROGRESS = 0
+        const val VIEW_TYPE_ODD = 1
+        const val VIEW_TYPE_EVEN = 2
+    }
+}

app/src/main/java/com/cars/adapter/DataDiffUtilCallback.kt

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+package com.cars.adapter
+
+import android.support.v7.util.DiffUtil
+import com.cars.model.DataModel
+
+class DataDiffUtilCallback(private val old: List<DataModel>,
+                           private val new: List<DataModel>) : DiffUtil.Callback() {
+
+    override fun getOldListSize(): Int = old.size
+
+    override fun getNewListSize(): Int = new.size
+
+    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        return old[oldItemPosition].getDataId() == new[newItemPosition].getDataId()
+    }
+
+    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        return old[oldItemPosition].getDisplayData() == new[newItemPosition].getDisplayData()
+    }
+}