Add paging helper (#7)

## Description

Add `androidx.paging` [v3
library](https://developer.android.com/topic/libraries/architecture/paging/v3-overview)
helper to handle integration layer content with pagination.

There is two use cases

1. Requesting a amount of content with a list of urns that exceed the
integration layer page limit (50)
2. Requesting a result with a nextUrl

Both are supported with

1. `UrnsPagingSource`
2. `NexturlPagingSource`

### Recommended

We recommend to use `DataProviderPaging` that simplify the usage and
retrieve directly the content needed with `PagingDataAdapter`.

## Usage

```kotlin
val dataProvider = DataProviderPaging(...)
val pagingAdapter = PagingDataAdapter(...)

dataProvider.getMediaRecommendedByUrn(urn, pageSize = 15).collectLatest { pagingData ->
    pagingAdapter.submitData(pagingData)
}
```

buildSrc/src/main/kotlin/Versions.kt

@@ -1,9 +1,10 @@
 object Versions {
     const val coreKtx = "1.8.0"
-    const val lifecycle_version = "2.5.1"
+    const val lifecycle = "2.5.1"
     const val dagger = "2.44.2"
-    const val retrofit_version = "2.9.0"
-    const val okHttp_version = "4.9.1"
-    const val gsonVersion = "2.10.1"
+    const val retrofit = "2.9.0"
+    const val okHttp = "4.9.1"
+    const val gson = "2.10.1"
     const val detekt = "1.22.0"
+    const val paging = "3.1.1"
 }

data/build.gradle.kts

@@ -38,7 +38,7 @@ android {
 
 dependencies {
     implementation("androidx.core:core-ktx:${Versions.coreKtx}")
-    implementation("com.google.code.gson:gson:${Versions.gsonVersion}")
+    implementation("com.google.code.gson:gson:${Versions.gson}")
 
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")

dataprovider-paging/.gitignore

@@ -0,0 +1 @@
+/build

dataprovider-paging/build.gradle.kts

@@ -0,0 +1,79 @@
+plugins {
+    id("com.android.library")
+    id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.kapt")
+    `maven-publish`
+}
+
+android {
+    namespace = "ch.srgssr.dataprovider.paging"
+    compileSdk = Config.compileSdk
+
+    defaultConfig {
+        minSdk = Config.minSdk
+        targetSdk = Config.targetSdk
+        group = Config.maven_group
+        version = Config.versionName
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = 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"
+    }
+    lint {
+        // https://developer.android.com/reference/tools/gradle-api/4.1/com/android/build/api/dsl/LintOptions
+        abortOnError = false
+    }
+}
+
+dependencies {
+    api(project(mapOf("path" to ":dataprovider-retrofit")))
+    implementation("androidx.core:core-ktx:${Versions.coreKtx}")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:${Versions.lifecycle}")
+    api("androidx.paging:paging-runtime-ktx:${Versions.paging}")
+
+    implementation("com.google.dagger:dagger:${Versions.dagger}")
+    kapt("com.google.dagger:dagger-compiler:${Versions.dagger}")
+
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+}
+
+publishing {
+    publications {
+        register<MavenPublication>("gpr") {
+            afterEvaluate {
+                from(components["release"])
+            }
+        }
+    }
+    repositories {
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/SRGSSR/srgdataprovider-android")
+            credentials {
+                username = project.findProperty("gpr.user") as String? ?: System.getenv("USERNAME")
+                password = project.findProperty("gpr.key") as String? ?: System.getenv("GITHUB_TOKEN")
+            }
+        }
+        maven {
+            url = uri("https://maven.ecetest.rts.ch/content/repositories/srg-letterbox-releases/")
+            credentials {
+                username = project.findProperty("sonatypeUsername") as String? ?: System.getenv("SONATYPE_USERNAME")
+                password = project.findProperty("sonatypePassword") as String? ?: System.getenv("SONATYPE_PASSWORD")
+            }
+        }
+    }
+}

dataprovider-paging/proguard-rules.pro

@@ -0,0 +1,21 @@
+# 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

dataprovider-paging/src/androidTest/java/ch/srgssr/dataprovider/paging/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package ch.srgssr.dataprovider.paging
+
+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("ch.srgssr.dataprovider.paging.test", appContext.packageName)
+    }
+}

dataprovider-paging/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>