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

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Previous episode: 06. Challenge: Use HttpUrlConnection Next episode: 08. Challenge: Request & Parse Data

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Notes: 07. Parse JSON Data

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

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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)