Programming Tutorials

Introduction In modern Android development, handling JSON data with unknown fields is common, especially when dealing with dynamic or third-party data sources. Parsing such data without flexibility can lead to errors, particularly when the JSON structure includes fields not defined in your data model. This article demonstrates how to use Kotlin's kotlinx.serialization library in an Android Jetpack Compose app to decode JSON while ignoring unknown keys. This feature is especially useful in applications where only specific fields are required, allowing developers to parse data efficiently and handle unexpected or extra fields gracefully. In this example, we build a simple Jetpack Compose UI that displays user information parsed from a JSON string. The code leverages Kotlinx Serialization with the ignoreUnknownKeys feature to skip over unrecognized fields in the JSON string without throwing errors. This approach ensures that the app remains robust and user-friendly, even when the JSO...

Kotlinx Serialization with Lenient Parsing in Jetpack Compose In modern Android app development, parsing JSON data efficiently and accurately is essential, especially when dealing with dynamic or inconsistent JSON formats. Kotlinx Serialization offers robust tools to handle these tasks, including lenient parsing, which can simplify working with JSON that may not strictly follow conventional syntax. This article will explore how to leverage Kotlinx Serialization's lenient parsing mode in a Jetpack Compose project, offering an approachable solution for handling loosely formatted JSON data. This Kotlin example centers on using Kotlinx Serialization with Jetpack Compose to parse a JSON string containing user information. The lenient mode in Kotlinx Serialization is activated to handle JSON that omits some structural rules, such as missing quotation marks around keys. The app displays the parsed information in a simple Compose UI, making it easy for developers to understand how lenient...

Introduction In this guide, we will walk through an example of setting up pretty-printed JSON serialization in an Android app using Jetpack Compose and Kotlinx Serialization. This example demonstrates how to create a simple Android application where data is encoded into a readable JSON format and displayed in the user interface using Jetpack Compose. JSON serialization is a powerful way to represent objects in a human-readable format, which is helpful for debugging, logging, and API communication. The example code is well-structured, leveraging modern Android libraries and tools, such as Jetpack Compose for building the UI and Kotlinx Serialization for JSON formatting. We'll break down each part of the code, explaining how the user interface, data model, and serialization are set up. By the end of this description, you’ll understand how these components work together and how to integrate pretty-printed JSON serialization into your own Compose-based Android applications. Understandi...

KtorClient.kt package com.cfsuman.composenetwork import android.util.Log import io.ktor.client.* import io.ktor.client.features.* import io.ktor.client.features.json.* import io.ktor.client.features.json.serializer.* import io.ktor.client.features.logging.* import io.ktor.client.request.* import io.ktor.http.* import kotlinx.serialization.json.Json object KtorClient{ private val json = Json { encodeDefaults = true ignoreUnknownKeys = true } val httpClient = HttpClient { install(JsonFeature){ serializer = KotlinxSerializer(json) } install(Logging){ logger = object : Logger { override fun log(message: String) { Log.d("xapp-ktor", message ) } } level = LogLevel.ALL } install(HttpTimeout){ socketTimeoutMillis = 15_000 requestTimeoutMillis = 15_000 connectTimeoutMill...

Introduction In Android development, networking is a key aspect of building apps that communicate with external services, and Ktor—a Kotlin-based HTTP client—is a popular choice for handling network requests in modern apps. Combined with Jetpack Compose, Android's declarative UI toolkit, we can achieve clean, readable, and maintainable code. This example demonstrates how to pass parameters to an API call using Ktor in an Android Jetpack Compose project. We'll break down the components of the project, focusing on network requests, parameter passing, and the integration of Compose for displaying API responses. This guide will take you through the steps of creating a simple Android app that makes a network request using Ktor and displays the response. You will see how Ktor's features like JSON serialization, logging, and timeouts are configured, and how parameters are passed in the network request. By the end, you'll understand how to make asynchronous network calls in a C...

Jetpack Compose: Fetching Text from URL This code demonstrates how to retrieve text content from a URL using Jetpack Compose. It utilizes coroutines for asynchronous network operations and presents the retrieved text along with progress indication. Breakdown: Setup: MainActivity sets the content of the activity using setContent . ComposeNetworkTheme is applied for theming purposes. A Scaffold provides the basic app layout with a TopAppBar and a content area. Main Content: MainContent composable defines the UI elements for user interaction and displaying content. A rememberCoroutineScope is used to launch coroutines within the composable. State variables are used to manage the displayed text ( txt ), progress visibility ( progressVisibility ), and scrolling state ( scrollState ). Fetching Text: A Button triggers the text retrieval process when clicked. Clicking the button resets the displayed text and sets the progress indicator visible. A coroutine launched with Dispatche...