add exception handles in api service

AirRobeWidget/src/main/kotlin/com/airrobe/widgetsdk/airrobewidget/service/AirRobeApiService.kt

@@ -3,6 +3,7 @@ package com.airrobe.widgetsdk.airrobewidget.service
 import com.airrobe.widgetsdk.airrobewidget.BuildConfig
 import org.json.JSONObject
 import java.io.*
+import java.lang.Exception
 import java.net.HttpURLConnection
 import java.net.URL
 import java.net.URLEncoder
@@ -13,7 +14,6 @@ internal object AirRobeApiService {
     const val POST: String = "POST"
     private val userHeaderString: String = "airrobeWidget/${BuildConfig.VERSION_NAME} (Android ${android.os.Build.VERSION.RELEASE})"
 
-    @Throws(IOException::class)
     fun requestPOST(r_url: String?, postDataParams: JSONObject): String? {
         val url = URL(r_url)
         val urlConnection: HttpURLConnection = url.openConnection() as HttpURLConnection
@@ -29,52 +29,61 @@ internal object AirRobeApiService {
         writer.flush()
         writer.close()
         os.close()
-        val responseCode: Int = urlConnection.responseCode // To Check for 200
-        if (responseCode == HttpsURLConnection.HTTP_OK) {
-            val `in` = BufferedReader(InputStreamReader(urlConnection.inputStream))
-            val sb = StringBuffer("")
-            var line: String?
-            while (`in`.readLine().also { line = it } != null) {
-                sb.append(line)
-                break
-            }
-            `in`.close()
-            return sb.toString()
+        return try {
+            val responseCode: Int = urlConnection.responseCode // To Check for 200
+            if (responseCode == HttpsURLConnection.HTTP_OK) {
+                val `in` = BufferedReader(InputStreamReader(urlConnection.inputStream))
+                val sb = StringBuffer("")
+                var line: String?
+                while (`in`.readLine().also { line = it } != null) {
+                    sb.append(line)
+                    break
+                }
+                `in`.close()
+                sb.toString()
+            } else null
+        } catch (e: IOException) {
+            return null
         }
-        return null
     }
 
-    @Throws(IOException::class)
     fun requestGET(url: String?): String? {
         val obj = URL(url)
         val urlConnection = obj.openConnection() as HttpURLConnection
         urlConnection.requestMethod = GET
-        val responseCode = urlConnection.responseCode
-        return if (responseCode == HttpURLConnection.HTTP_OK) {
-            val `in` = BufferedReader(InputStreamReader(urlConnection.inputStream))
-            var inputLine: String?
-            val response = StringBuffer()
-            while (`in`.readLine().also { inputLine = it } != null) {
-                response.append(inputLine)
-            }
-            `in`.close()
-            response.toString()
-        } else null
+        return try {
+            val responseCode = urlConnection.responseCode
+            if (responseCode == HttpURLConnection.HTTP_OK) {
+                val `in` = BufferedReader(InputStreamReader(urlConnection.inputStream))
+                var inputLine: String?
+                val response = StringBuffer()
+                while (`in`.readLine().also { inputLine = it } != null) {
+                    response.append(inputLine)
+                }
+                `in`.close()
+                response.toString()
+            } else null
+        } catch (e: IOException) {
+            null
+        }
     }
 
-    @Throws(java.lang.Exception::class)
     private fun encodeParams(params: JSONObject): String? {
         val result = StringBuilder()
         var first = true
         val itr = params.keys()
-        while (itr.hasNext()) {
-            val key = itr.next()
-            val value = params[key]
-            if (first) first = false else result.append("&")
-            result.append(URLEncoder.encode(key, "UTF-8"))
-            result.append("=")
-            result.append(URLEncoder.encode(value.toString(), "UTF-8"))
+        return try {
+            while (itr.hasNext()) {
+                val key = itr.next()
+                val value = params[key]
+                if (first) first = false else result.append("&")
+                result.append(URLEncoder.encode(key, "UTF-8"))
+                result.append("=")
+                result.append(URLEncoder.encode(value.toString(), "UTF-8"))
+            }
+            result.toString()
+        } catch (e: Exception) {
+            null
         }
-        return result.toString()
     }
 }