Android Networking: Fundamentals

Sep 6 2022 · Kotlin 1.6, Android 12, Android Studio Chipmunk | 2021.2.1 Patch 1

Part 1: Learn About HTTP & Threading

07. Parse JSON Data

Episode complete

Play next episode

Next
About this episode

Leave a rating/review

See forum comments
Cinema mode Mark complete Download course materials
Previous episode: 06. Challenge: Use HttpUrlConnection Next episode: 08. Challenge: Request & Parse Data

Get immediate access to this and 4,000+ other videos and books.

Take your career further with a Kodeco Personal Plan. With unlimited access to over 40+ books and 4,000+ professional videos in a single subscription, it's simply the best investment you can make in your development career.

Learn more Already a subscriber? Sign in.

Notes: 07. Parse JSON Data

The student materials have been reviewed and are updated as of July 2022.

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

After practicting parsing the data manually, it’s time to see how you can do it automatically, using a library called GSON.

implementation 'com.google.code.gson:gson:2.8.6'
private val networkStatusChecker by lazy {
  NetworkStatusChecker(activity?.getSystemService(ConnectivityManager::class.java))
}
networkStatusChecker.performIfConnectedToInternet {
  activity?.runOnUiThread {
    ...
  }
}
private val gson = Gson()
Thread(Runnable {
  val connection = URL("$BASE_URL/api/note").openConnection() as HttpURLConnection
  connection.requestMethod = "GET"
  connection.setRequestProperty("Content-Type", "application/json")
  connection.setRequestProperty("Accept", "application/json")
  connection.setRequestProperty("Authorization", App.getToken())
  connection.readTimeout = 10000
  connection.connectTimeout = 10000
  connection.doInput = true

  connection.disconnect()
}).start()
Thread(Runnable {
  val connection = URL("$BASE_URL/api/note").openConnection() as HttpURLConnection
  connection.requestMethod = "GET"
  connection.setRequestProperty("Content-Type", "application/json")
  connection.setRequestProperty("Accept", "application/json")
  connection.setRequestProperty("Authorization", App.getToken())
  connection.readTimeout = 10000
  connection.connectTimeout = 10000
  connection.doInput = true

  try {
    val reader = InputStreamReader(connection.inputStream)

    reader.use { input ->
      val response = StringBuilder()
      val bufferedReader = BufferedReader(input)

      bufferedReader.useLines { lines ->
        lines.forEach {
          response.append(it.trim())
        }
      }
    }
  } catch (error: Throwable) {

  }

  connection.disconnect()
}).start()
Thread(Runnable {
  val connection = URL("$BASE_URL/api/note").openConnection() as HttpURLConnection
  connection.requestMethod = "GET"
  connection.setRequestProperty("Content-Type", "application/json")
  connection.setRequestProperty("Accept", "application/json")
  connection.setRequestProperty("Authorization", App.getToken())
  connection.readTimeout = 10000
  connection.connectTimeout = 10000
  connection.doInput = true

  try {
    val reader = InputStreamReader(connection.inputStream)

    reader.use { input ->
      val response = StringBuilder()
      val bufferedReader = BufferedReader(input)

      bufferedReader.useLines { lines ->
        lines.forEach {
          response.append(it.trim())
        }
      }

      val tasksResponse = gson.fromJson(response.toString(), GetTasksResponse::class.java)
      onTasksReceived(tasksResponse.notes, null)
    }
  } catch (error: Throwable) {
    onTasksReceived(emptyList(), error)
  }

  connection.disconnect()
}).start()
val request = gson.toJson(addTaskRequest)
...
val body = gson.toJson(userDataRequest) // login & register

val task = gson.fromJson(response.toString(), Task::class.java)