Move from Gson to kotlinx.serialization

githubAppUpdate/build.gradle.kts

@@ -3,13 +3,15 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 plugins {
     id("com.android.library")
     id("maven-publish")
+    kotlin("plugin.serialization") version "2.3.20"
 }
 
 android {
     namespace = "info.hannes.github"
     compileSdk = 36
     defaultConfig {
         minSdk = 23
+        consumerProguardFiles("proguard-rules.pro")
     }
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
@@ -31,12 +33,12 @@ base {
 
 dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.3.20")
-    implementation("com.google.code.gson:gson:2.13.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1")
     implementation("androidx.work:work-runtime-ktx:2.11.2")
 
     implementation("com.squareup.retrofit2:retrofit:3.0.0")
     implementation("androidx.appcompat:appcompat:1.7.1")
-    implementation("com.squareup.retrofit2:converter-gson:3.0.0")
+    implementation("com.squareup.retrofit2:converter-kotlinx-serialization:3.0.0")
     implementation("androidx.preference:preference-ktx:1.2.1")
     api("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2")
     api("androidx.lifecycle:lifecycle-runtime-ktx:2.10.0")

githubAppUpdate/proguard-rules.pro

@@ -1,7 +1,7 @@
 # Keep Kotlin metadata for coroutines
 -keep class kotlin.Metadata { *; }
 -keepattributes RuntimeVisibleAnnotations
--keepattributes *Annotation*
+-keepattributes *Annotation*,InnerClasses,AnnotationDefault
 
 # Keep coroutine related classes
 -keepclassmembernames class kotlinx.** {
@@ -14,7 +14,6 @@
 
 # Don't obfuscate Kotlin metadata
 -keepattributes SourceFile,LineNumberTable
--renamesourcefileattribute SourceFile
 
 # Keep synthetic methods for Kotlin coroutines
 -keepclassmembers class ** {
@@ -31,3 +30,35 @@
 # Keep lifecycle coroutine scope
 -keep class androidx.lifecycle.** { *; }
 -keepclassmembers class androidx.lifecycle.** { *; }
+
+##------------------ kotlinx.serialization ------------------
+
+# Keep @Serializable companion objects and their serializer() methods
+-if @kotlinx.serialization.Serializable class **
+-keepclassmembers class <1> {
+    static <1>$Companion Companion;
+}
+
+# Keep serializer() on named companion objects of serializable classes
+-if @kotlinx.serialization.Serializable class ** {
+    static **$* *;
+}
+-keepclassmembers class <2>$<3> {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# Keep INSTANCE.serializer() for serializable objects
+-if @kotlinx.serialization.Serializable class ** {
+    public static ** INSTANCE;
+}
+-keepclassmembers class <1> {
+    public static <1> INSTANCE;
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# Keep serialization descriptor fields
+-keepclassmembers class kotlinx.serialization.internal.** { *; }
+
+# Suppress notes about kotlinx.serialization internals
+-dontnote kotlinx.serialization.**
+-dontwarn kotlinx.serialization.**

githubAppUpdate/src/main/java/info/hannes/github/AppUpdateHelper.kt

@@ -68,7 +68,7 @@ object AppUpdateHelper {
                 prefs.edit { putLong(key, System.currentTimeMillis()) }
 
                 versionList.body()?.firstOrNull()?.let { release ->
-                    val assetApk = release.assets.find { it.name.endsWith("release.apk") }
+                    val assetApk = release.assets.find { it.name?.endsWith("release.apk") == true }
 
                     Log.d("AppUpdateHelper", release.tagName + " > " + currentVersionName + " " + (release.tagName > currentVersionName))
                     if (release.tagName > currentVersionName) {
@@ -96,7 +96,7 @@ object AppUpdateHelper {
             val versionList = requestVersionsSync(gitRepoUrl, token)
 
             versionList.body()?.firstOrNull()?.let { release ->
-                val assetApk = release.assets.find { it.name.endsWith("release.apk") }
+                val assetApk = release.assets.find { it.name?.endsWith("release.apk") == true }
 
                 Log.d("AppUpdateHelper", release.tagName + " > " + currentVersionName + " " + (release.tagName > currentVersionName))
                 val text = "You use version $currentVersionName\n" +
@@ -112,12 +112,12 @@ object AppUpdateHelper {
         }
     }
 
-    private fun requestVersionsSync(gitRepoUrl: String, token: String? = null): Response<MutableList<GithubVersion>> {
+    private fun requestVersionsSync(gitRepoUrl: String, token: String? = null): Response<List<GithubVersion>> {
         val client = GithubClient(HttpLoggingInterceptor.Level.BODY, token)
         return client.github.getGithubVersions(gitRepoUrl.user(), gitRepoUrl.repo()).execute()
     }
 
-    private suspend fun requestGithubVersions(gitRepoUrl: String, token: String? = null): Response<MutableList<GithubVersion>> {
+    private suspend fun requestGithubVersions(gitRepoUrl: String, token: String? = null): Response<List<GithubVersion>> {
         val versionList = withContext(Dispatchers.Default) {
             val client = GithubClient(HttpLoggingInterceptor.Level.BODY, token)
             client.github.getGithubVersions(gitRepoUrl.user(), gitRepoUrl.repo()).execute()
@@ -147,15 +147,15 @@ object AppUpdateHelper {
                 dialog.dismiss()
             }
             .setPositiveButton(activity.getString(R.string.showRelease)) { dialog, _ ->
-                val uriUrl = release.htmlUrl.toUri()
+                val uriUrl = release.htmlUrl.orEmpty().toUri()
                 Log.d("open", uriUrl.toString())
                 activity.startActivity(Intent(Intent.ACTION_VIEW, uriUrl))
                 dialog.dismiss()
             }
 
         assetApk?.let {
             dialog.setNeutralButton(activity.getString(R.string.directDownload)) { dialog, _ ->
-                val uriUrl = it.browserDownloadUrl.toUri()
+                val uriUrl = it.browserDownloadUrl.orEmpty().toUri()
                 Log.d("open", uriUrl.toString())
                 activity.startActivity(Intent(Intent.ACTION_VIEW, uriUrl))
                 dialog.dismiss()

githubAppUpdate/src/main/java/info/hannes/github/GithubRestServiceCreationHelper.kt

@@ -1,23 +1,23 @@
 package info.hannes.github
 
-import com.google.gson.Gson
-import com.google.gson.GsonBuilder
+import kotlinx.serialization.json.Json
+import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
 import retrofit2.Retrofit
-import retrofit2.converter.gson.GsonConverterFactory
+import retrofit2.converter.kotlinx.serialization.asConverterFactory
 
 internal object GithubRestServiceCreationHelper {
 
     private var httpLoggingInterceptor: HttpLoggingInterceptor = HttpLoggingInterceptor()
 
-    init {
-        httpLoggingInterceptor.level = HttpLoggingInterceptor.Level.NONE
+    private val json = Json {
+        ignoreUnknownKeys = true
+        coerceInputValues = true
     }
 
-    private fun createGson(): Gson {
-        return GsonBuilder().serializeNulls()
-            .create()
+    init {
+        httpLoggingInterceptor.level = HttpLoggingInterceptor.Level.NONE
     }
 
     fun <T> createGithubService(retrofitInterface: Class<T>, logLevel: HttpLoggingInterceptor.Level, token: String? = null): T {
@@ -34,11 +34,10 @@ internal object GithubRestServiceCreationHelper {
         val client = clientHttp
             .build()
 
-        val gson = createGson()
         val retrofit = Retrofit.Builder()
             .baseUrl("https://api.github.com")
             .client(client)
-            .addConverterFactory(GsonConverterFactory.create(gson))
+            .addConverterFactory(json.asConverterFactory("application/json; charset=UTF-8".toMediaType()))
             .build()
 
         return retrofit.create(retrofitInterface)

githubAppUpdate/src/main/java/info/hannes/github/IGithub.kt

@@ -0,0 +1,16 @@
+package info.hannes.github
+
+import info.hannes.github.model.GithubVersion
+import retrofit2.Call
+import retrofit2.http.GET
+import retrofit2.http.Headers
+import retrofit2.http.Path
+
+interface IGithub {
+    @GET("/repos/{githubUser}/{githubRepo}/releases")
+    @Headers("Accept: application/json")
+    fun getGithubVersions(
+        @Path("githubUser") githubUser: String,
+        @Path("githubRepo") githubRepo: String
+    ): Call<List<GithubVersion>>
+}

githubAppUpdate/src/main/java/info/hannes/github/Notify.kt

@@ -42,7 +42,7 @@ internal object Notify {
         //the message that will be displayed as the ticker
         val ticker = "$contentTitle $messageString"
 
-        val showUrl = release.htmlUrl.toUri()
+        val showUrl = release.htmlUrl.orEmpty().toUri()
         val showPendingIntent = PendingIntent.getActivity(context, 0, Intent(Intent.ACTION_VIEW, showUrl), PENDING_INTENT_FLAGS)
 
         //build the notification
@@ -58,7 +58,7 @@ internal object Notify {
             .addAction(R.drawable.githib_logo, context.getString(R.string.showRelease), showPendingIntent)
 
         assetApk?.let {
-            val uriUrl = it.browserDownloadUrl.toUri()
+            val uriUrl = it.browserDownloadUrl.orEmpty().toUri()
             val directPendingIntent = PendingIntent.getActivity(context, 0, Intent(Intent.ACTION_VIEW, uriUrl), PENDING_INTENT_FLAGS)
             notificationCompat.addAction(R.drawable.githib_logo, context.getString(R.string.directDownload), directPendingIntent)
         }