« Network calls without Retrofit

Here we are using HttpURLConnection and Gson serializer.

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1CoroutineScope(Dispatchers.IO).launch {
2    var httpURLConnection: HttpURLConnection? = null
3    try {
4
5        val url = URL("https://reqres.in/api/users?page=2")
6
7        httpURLConnection = url.openConnection() as HttpURLConnection
8
9        val code = httpURLConnection.responseCode
10
11        if (code != 200) {
12            throw IOException("The error from the server is $code")
13        }
14
15        val bufferedReader = BufferedReader(
16            InputStreamReader(httpURLConnection.inputStream)
17        )
18
19        val jsonStringHolder: StringBuilder = StringBuilder()
20
21        while (true) {
22            val readLine = bufferedReader.readLine() ?: break
23            jsonStringHolder.append(readLine)
24        }
25
26        val userProfileResponse =
27            Gson().fromJson(jsonStringHolder.toString(), UserProfileResponse::class.java)
28
29        withContext(Dispatchers.Main) {
30            findViewById<TextView>(R.id.name).apply {
31                text = userProfileResponse.data[0].let {
32                    "${it.firstName} ${it.lastName}"
33                }
34            }
35        }
36    } catch (ioexception: IOException) {
37        Log.e(this.javaClass.name, ioexception.message.toString())
38    } finally {
39        httpURLConnection?.disconnect()
40    }
41}

For full code repository please refer

https://github.com/anishakd4/NetworkCallsWithoutRetrofit