Code snippet to demonstrate implementation of network calls and SSL pinning using TrustStore and SSL socket factory in Android

TrustStoreAndSslSocketFactory

// get the TrustStore that you just placed in resources
val resourceStream = resources.openRawResource(R.raw.your_trust_store)

// create an empty default KeyStore
val keyStoreType = KeyStore.getDefaultType()
val keyStore = KeyStore.getInstance(keyStoreType)

// load the KeyStore from input stream of TrustStore
keyStore.load(resourceStream, getTrustStorePassword()?.toCharArray())

val trustManagerAlgorithm = TrustManagerFactory.getDefaultAlgorithm()
val trustManagerFactory = TrustManagerFactory.getInstance(trustManagerAlgorithm)
trustManagerFactory.init(keyStore)

val sslContext = SSLContext.getInstance("TLS")
sslContext.init(null, trustManagerFactory.trustManagers, null)

// open connection using HttpsURLConnection
val urlConnection = url.openConnection() as HttpsURLConnection

// assign to sslSocketFactory
urlConnection.sslSocketFactory = sslContext.socketFactory

// fetch and print the responce
val inputStream: InputStream = urlConnection.inputStream
var line: String?
var sb = StringBuffer()
try {
    BufferedReader(InputStreamReader(inputStream, "UTF-8")).use { br ->
        while (br.readLine().also { line = it } != null) {
            sb.append(line)
        }
        Log.d("TrustStoreExample", "Response body is " + sb.toString())
    }
} catch (e: IOException) {
    Log.d("TrustStoreExample", "Exception occurred " + e.stackTrace)
}