Jetpack Compose – Lesson 35, Using Kotlin Object for Navigation and JSON De/Serialization

Jetpack Compose navigation isn’t just about passing simple strings. It’s about serializing and deserializing data objects using Kotlin. With a few steps, you can create a data class, serialize it to JSON, and navigate through screens flawlessly. It’s like packing your bags for a seamless journey through the app world! 🧳✨ #AppDevInsights

Jetpack Compose – 35: Navigating with Kotlin Object | JSON De/Serialisation

Introduction

In this video, we will explore Jetpack Compose navigation and how to pass data objects from one screen to another using serialization and deserialization.

Creating Kotlin Data Class for Serialization🛠️

To start with, we need to create a data class in Kotlin for serialization. We will make use of the @Serializable annotation to make the class serializable.

package data

data class Student(
    val name: String,
    val age: Int,
    val grade: String
) : Serializable

Adding Dependencies and Annotations📦

To enable serialization, we need to add the necessary dependencies in our build.gradle.kts file and use the @Serializable annotation in our Kotlin class.

// build.gradle.kts
plugins {
    kotlin("plugin.serialization")
}

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:1.3.0")
}

// Student.kt
@Serializable
data class Student(
    val name: String,
    val age: Int,
    val grade: String
)

Serializing and Deserializing JSON Datađź”—

Once the data class is created and the necessary dependencies are added, we can proceed with serializing and deserializing JSON data. This involves converting the data object into a JSON string and then deserializing it back into the original object.

// Serializing JSON Data
val sampleStudent = Student("John", 25, "A+")
val json = Json { prettyPrint = true }
val jsonData = json.encodeToString(Student.serializer(), sampleStudent)

// Deserializing JSON Data
val jsonStudent = "{ \"name\": \"John\", \"age\": 25, \"grade\": \"A+\" }"
val sampleStudent = json.decodeFromString(Student.serializer(), jsonStudent)

Passing Serialized Data Between Screens🔄

In the first screen, we can now pass the serialized JSON data to the second screen. We convert the data object into a JSON string and then pass it to the second screen.

val json = Json { prettyPrint = true }
val jsonData = json.encodeToString(Student.serializer(), sampleStudent)

Conclusion

In this video, we learned how to navigate Jetpack Compose using Kotlin objects and how to serialize and deserialize JSON data for passing between screens. The use of serialization simplifies the process of passing complex data objects.

Key Takeaways

  • Jetpack Compose navigation allows for easy data passing between screens.
  • Kotlin object serialization simplifies the process of converting data objects to and from JSON format.

FAQ

Q: Why use Kotlin object serialization?
A: Kotlin object serialization provides a simple and efficient way to serialize and deserialize data objects, making it easier to pass data between screens.

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Codetutor
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