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

06. Challenge: Use HttpUrlConnection

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Notes: 06. Challenge: Use HttpUrlConnection

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

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The best way to make sure you’ve got a good understanding of creating requests and parsing the data is to pratice it on an example. In this challenge, you have to do two things.

if (App.getToken().isNotBlank()) {
  startActivity(MainActivity.getIntent(this))
}
private val networkStatusChecker by lazy {
  NetworkStatusChecker(activity?.getSystemService(ConnectivityManager::class.java))
}
networkStatusChecker.performIfConnectedToInternet {
  activity?.runOnUiThread {
    ...
  }
}
Thread(Runnable {

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

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

  val request = JSONObject()
  request.put("title", addTaskRequest.title)
  request.put("content", addTaskRequest.content)
  request.put("taskPriority", addTaskRequest.taskPriority)
  
  connection.disconnect()
}).start()
Thread(Runnable {
  val connection = URL("$BASE_URL/api/note").openConnection() as HttpURLConnection
  connection.requestMethod = "POST"
  connection.setRequestProperty("Content-Type", "application/json")
  connection.setRequestProperty("Accept", "application/json")
  connection.setRequestProperty("Authorization", App.getToken())
  connection.readTimeout = 10000
  connection.connectTimeout = 10000
  connection.doOutput = true
  connection.doInput = true

  val request = JSONObject()
  request.put("title", addTaskRequest.title)
  request.put("content", addTaskRequest.content)
  request.put("taskPriority", addTaskRequest.taskPriority)

  try {
    connection.outputStream.use { outputStream ->
      outputStream.write(request.toString().toByteArray())
    }

    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 = "POST"
  connection.setRequestProperty("Content-Type", "application/json")
  connection.setRequestProperty("Accept", "application/json")
  connection.setRequestProperty("Authorization", App.getToken())
  connection.readTimeout = 10000
  connection.connectTimeout = 10000
  connection.doOutput = true
  connection.doInput = true

  val request = JSONObject()
  request.put("title", addTaskRequest.title)
  request.put("content", addTaskRequest.content)
  request.put("taskPriority", addTaskRequest.taskPriority)

  try {
    connection.outputStream.use { outputStream ->
      outputStream.write(request.toString().toByteArray())
    }

    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 jsonObject = JSONObject(response.toString())

      val task = Task(
          jsonObject.getString("id"),
          jsonObject.getString("title"),
          jsonObject.getString("content"),
          jsonObject.getBoolean("isCompleted"),
          jsonObject.getInt("taskPriority")
      )

      onTaskCreated(task, null)
    }
  } catch (error: Throwable) {
    onTaskCreated(null, error)
  }

  connection.disconnect()
}).start()