Migrate from Gson to Kotlinx Serialization

app/build.gradle.kts

@@ -51,6 +51,7 @@ dependencies {
     // Extras
     implementation (libs.app.compat)
     implementation (libs.accompanist.navigation.animation)
+    implementation (libs.kotlinx.serialization.json)
 
 
     // Material

app/proguard-rules.pro

@@ -4,31 +4,6 @@
 -dontwarn org.bouncycastle.**
 -dontwarn org.openjsse.**
 
-#Gson Rules
- -keepattributes Signature
- -keepattributes *Annotation*
- -dontwarn sun.misc.**
-
- # JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
- -keep class * extends com.google.gson.TypeAdapter
- -keep class * implements com.google.gson.TypeAdapterFactory
- -keep class * implements com.google.gson.JsonSerializer
- -keep class * implements com.google.gson.JsonDeserializer
-
- #Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.
- -keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
- -keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken
-
--assumenosideeffects class kotlin.jvm.internal.Intrinsics {
-    static void checkParameterIsNotNull(java.lang.Object, java.lang.String);
-}
-
--keepclassmembers,allowobfuscation class * {
-
-  @com.google.gson.annotations.SerializedName <fields>;
-
-}
-
 # Keep Domain data classes
 -keep class com.my.kizzy.domain.model.** { <fields>; }
 
@@ -41,10 +16,5 @@
 # slf4j error during build
 -dontwarn org.slf4j.impl.StaticLoggerBinder
 
-# Waiting for new retrofit release to remove these rules
--keep,allowobfuscation,allowshrinking interface retrofit2.Call
--keep,allowobfuscation,allowshrinking class retrofit2.Response
--keep,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation
-
 # some unknown error
 -dontwarn java.lang.invoke.StringConcatFactory

app/src/main/java/com/my/kizzy/Kizzy.kt

@@ -17,7 +17,6 @@ import android.content.ComponentName
 import androidx.activity.ComponentActivity
 import androidx.activity.viewModels
 import androidx.compose.animation.ExperimentalAnimationApi
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
@@ -28,7 +27,6 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.platform.LocalContext
 import com.google.accompanist.navigation.animation.AnimatedNavHost
 import com.google.accompanist.navigation.animation.rememberAnimatedNavController
-import com.google.gson.Gson
 import com.my.kizzy.data.utils.fromJson
 import com.my.kizzy.domain.model.User
 import com.my.kizzy.feature_about.about.About
@@ -44,9 +42,9 @@ import com.my.kizzy.feature_home.provideFeatures
 import com.my.kizzy.feature_logs.LogScreen
 import com.my.kizzy.feature_logs.LogsViewModel
 import com.my.kizzy.feature_media_rpc.MediaRPC
-import com.my.kizzy.feature_profile.ui.user.UserViewModel
 import com.my.kizzy.feature_profile.ui.login.LoginScreen
 import com.my.kizzy.feature_profile.ui.user.UserScreen
+import com.my.kizzy.feature_profile.ui.user.UserViewModel
 import com.my.kizzy.feature_rpc_base.AppUtils
 import com.my.kizzy.feature_rpc_base.services.KizzyTileService
 import com.my.kizzy.feature_settings.language.Language
@@ -57,9 +55,10 @@ import com.my.kizzy.feature_startup.StartUp
 import com.my.kizzy.navigation.Routes
 import com.my.kizzy.navigation.animatedComposable
 import com.my.kizzy.preference.Prefs
+import kotlinx.serialization.json.Json
 
 @SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
-@OptIn(ExperimentalAnimationApi::class, ExperimentalMaterial3Api::class)
+@OptIn(ExperimentalAnimationApi::class)
 @Composable
 internal fun ComponentActivity.Kizzy() {
     Scaffold()
@@ -86,7 +85,7 @@ internal fun ComponentActivity.Kizzy() {
                     })
             }
             animatedComposable(Routes.HOME) {
-                val user: User? = Gson().fromJson(Prefs[Prefs.USER_DATA, ""])
+                val user: User? = Json.fromJson(Prefs[Prefs.USER_DATA, ""])
                 val ctx = LocalContext.current
                 Home(
                     features = provideFeatures(

common/preference/build.gradle.kts

@@ -12,7 +12,7 @@ dependencies {
     implementation(projects.common.resources)
     implementation(libs.material3)
     implementation(libs.mmkv)
-    implementation(libs.gson)
     implementation(libs.kotlinx.coroutine)
     implementation(libs.compose.ui)
+    implementation(libs.kotlinx.serialization.json)
 }

common/preference/src/main/java/com/my/kizzy/preference/Prefs.kt

@@ -12,9 +12,10 @@
 
 package com.my.kizzy.preference
 
-import com.google.gson.Gson
-import com.google.gson.reflect.TypeToken
 import com.tencent.mmkv.MMKV
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 
 object Prefs {
     val kv = MMKV.defaultMMKV()
@@ -48,25 +49,19 @@ object Prefs {
 
     fun isAppEnabled(packageName: String?): Boolean {
         val apps = get(ENABLED_APPS, "[]")
-        val enabledPackages: ArrayList<String> = Gson().fromJson(
-            apps,
-            object : TypeToken<ArrayList<String>?>() {}.type
-        )
+        val enabledPackages: ArrayList<String> = Json.decodeFromString(apps)
         return enabledPackages.contains(packageName)
     }
 
     fun saveToPrefs(pkg: String) {
         val apps = get(ENABLED_APPS, "[]")
-        val enabledPackages: ArrayList<String> = Gson().fromJson(
-            apps,
-            object : TypeToken<ArrayList<String>?>() {}.type
-        )
+        val enabledPackages: ArrayList<String> = Json.decodeFromString(apps)
         if (enabledPackages.contains(pkg))
             enabledPackages.remove(pkg)
         else
             enabledPackages.add(pkg)
 
-        set(ENABLED_APPS, Gson().toJson(enabledPackages))
+        set(ENABLED_APPS, Json.encodeToString(enabledPackages))
     }
     //User Preferences
     const val USER_DATA = "user" //Json Data Referencing User_Data class

domain/src/main/java/com/my/kizzy/domain/model/User.kt

@@ -22,29 +22,29 @@ data class User(
     @SerialName("nitro")
     val nitro: Boolean? = false,
     @SerialName("accent_color")
-    val accentColor: Int?,
+    val accentColor: Int? = null,
     @SerialName("avatar")
-    val avatar: String?,
+    val avatar: String? = null,
     @SerialName("avatar_decoration")
-    val avatarDecoration: String?,
+    val avatarDecoration: String? = null,
     @SerialName("badges")
-    val badges: List<Badge>?,
+    val badges: List<Badge>? = null,
     @SerialName("banner")
-    val banner: String?,
+    val banner: String? = null,
     @SerialName("banner_color")
-    val bannerColor: String?,
+    val bannerColor: String? = null,
     @SerialName("discriminator")
-    val discriminator: String?,
+    val discriminator: String? = null,
     @SerialName("id")
-    val id: String?,
+    val id: String? = null,
     @SerialName("public_flags")
-    val publicFlags: Int?,
+    val publicFlags: Int? = null,
     @SerialName("username")
-    val username: String?,
+    val username: String? = null,
     @SerialName("special")
-    val special: String?,
+    val special: String? = null,
     @SerialName("verified")
-    val verified: Boolean
+    val verified: Boolean = false
 ) {
     fun getAvatarImage(): String {
         return if (avatar?.startsWith("a_") == true)

feature_console_rpc/build.gradle.kts

@@ -12,7 +12,7 @@ android {
 dependencies {
     implementation (projects.featureRpcBase)
     implementation (libs.material.icons.extended)
-    implementation (libs.gson)
     implementation (libs.glide)
     implementation (libs.activity.compose)
+    implementation (libs.kotlinx.serialization.json)
 }

feature_console_rpc/src/main/java/com/my/kizzy/feature_console_rpc/GamesScreen.kt

@@ -35,7 +35,6 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import com.google.gson.Gson
 import com.my.kizzy.domain.model.Game
 import com.my.kizzy.domain.model.RpcConfig
 import com.my.kizzy.feature_rpc_base.services.AppDetectionService
@@ -50,6 +49,8 @@ import com.my.kizzy.ui.components.SwitchBar
 import com.my.kizzy.ui.components.shimmer.AnimatedShimmer
 import com.my.kizzy.ui.components.shimmer.ShimmerGamesScreen
 import com.skydoves.landscapist.glide.GlideImage
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -187,7 +188,7 @@ fun GamesScreen(
                                     selected = game.game_title == selected
                                 ) { info ->
                                     selected = game.game_title
-                                    val string = Gson().toJson(
+                                    val string = Json.encodeToString(
                                         RpcConfig(
                                             name = info.platform,
                                             details = info.game_title,

feature_custom_rpc/build.gradle.kts

@@ -12,10 +12,10 @@ android {
 dependencies {
     implementation (libs.material.icons.extended)
     implementation(libs.accompanist.permission)
-    implementation(libs.gson)
     implementation(libs.activity.compose)
     implementation(libs.blankj.utilcodex)
     implementation(libs.glide)
+    implementation(libs.kotlinx.serialization.json)
     implementation(projects.featureRpcBase)
     implementation(projects.featureProfile)
 }

feature_custom_rpc/src/main/java/com/my/kizzy/feature_custom_rpc/CustomRpc.kt

@@ -29,7 +29,6 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
-import com.google.gson.Gson
 import com.my.kizzy.data.rpc.Constants.MAX_ALLOWED_CHARACTER_LENGTH
 import com.my.kizzy.domain.model.User
 import com.my.kizzy.feature_custom_rpc.components.BottomSheet
@@ -52,6 +51,8 @@ import com.my.kizzy.ui.components.BackButton
 import com.my.kizzy.ui.components.RpcField
 import com.my.kizzy.ui.components.SwitchBar
 import kotlinx.coroutines.launch
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
 import java.util.*
 
 @Composable
@@ -113,7 +114,7 @@ fun CustomRPC(
     }
     if (state.showPreviewDialog) {
         val json = Prefs[Prefs.USER_DATA, "{}"]
-        val user = Gson().fromJson(json, User::class.java)
+        val user = Json.decodeFromString<User>(json)
         PreviewDialog(
             user = user,
             rpc = state.rpcConfig,

feature_custom_rpc/src/main/java/com/my/kizzy/feature_custom_rpc/components/sheet/utils.kt

@@ -17,15 +17,16 @@ import android.net.Uri
 import android.os.Build
 import android.os.Environment
 import com.blankj.utilcode.util.FileIOUtils
-import com.google.gson.GsonBuilder
 import com.my.kizzy.data.rpc.Constants
 import com.my.kizzy.data.utils.getFileName
 import com.my.kizzy.domain.model.RpcConfig
 import com.my.kizzy.preference.Prefs
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 import java.io.File
 import java.io.FilenameFilter
 
-internal val gson = GsonBuilder().setPrettyPrinting().serializeNulls().create()
 internal val FILE_FILTER = FilenameFilter { _: File?, f: String ->
     f.endsWith(".json")
 }
@@ -61,18 +62,18 @@ internal fun Context.handleUriResult(uri: Uri?, onSuccess: (json: String) -> Uni
         onSuccess(json)
     }
 }
+internal val json = Json {
+    ignoreUnknownKeys = true
+}
 
-fun RpcConfig.dataToString(): String {
-    return gson.toJson(this)
+internal fun RpcConfig.dataToString(): String {
+    return json.encodeToString(this)
 }
 
-fun String.stringToData(): RpcConfig {
+
+internal fun String.stringToData(): RpcConfig {
     return try {
-        var config = gson.fromJson(this, RpcConfig::class.java)
-        //Gson will set value of url as null if its not present in json
-        if (config.url == null)
-            config = config.copy(url = "")
-        return config
+        return json.decodeFromString(this)
     } catch (ex: Exception) {
         RpcConfig()
     }

feature_home/build.gradle.kts

@@ -9,7 +9,6 @@ android {
 }
 
 dependencies {
-    implementation (libs.gson)
     implementation (libs.accompanist.flowLayout)
     implementation (projects.featureRpcBase)
     implementation (projects.featureSettings)

feature_profile/build.gradle.kts

@@ -13,6 +13,6 @@ dependencies {
     implementation (projects.theme)
     implementation (projects.gateway)
     implementation (libs.glide)
-    implementation (libs.gson)
     implementation(libs.activity.compose)
+    implementation(libs.kotlinx.serialization.json)
 }

feature_profile/src/main/java/com/my/kizzy/feature_profile/ui/user/UserViewModel.kt

@@ -17,14 +17,16 @@ import androidx.compose.runtime.State
 import androidx.compose.runtime.mutableStateOf
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import com.google.gson.Gson
 import com.my.kizzy.domain.model.Resource
 import com.my.kizzy.domain.model.User
 import com.my.kizzy.domain.use_case.get_user.GetUserUseCase
 import com.my.kizzy.preference.Prefs
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
 import javax.inject.Inject
 
 @HiltViewModel
@@ -48,10 +50,10 @@ class UserViewModel @Inject constructor(
                             nitro = Prefs[Prefs.USER_NITRO]
                         )
                     )
-                    Prefs[Prefs.USER_DATA] = Gson().toJson(result.data)
+                    Prefs[Prefs.USER_DATA] = Json.encodeToString(result.data)
                 }
                 is Resource.Error -> {
-                    val user = Gson().fromJson(Prefs[Prefs.USER_DATA,"{}"], User::class.java)
+                    val user = Json.decodeFromString<User>(Prefs[Prefs.USER_DATA,"{}"])
                     _state.value = UserState.Error(
                         error = result.message ?: "An unexpected error occurred",
                         user = user

feature_rpc_base/build.gradle.kts

@@ -9,8 +9,7 @@ android {
 }
 
 dependencies {
-    implementation (libs.gson)
     implementation (libs.blankj.utilcodex)
     implementation(libs.androidx.material)
-
+    implementation(libs.kotlinx.serialization.json)
 }