refactor: converted POJO classes to kotlin models.Fixes fossasia#2357

android/app/build.gradle

@@ -1,5 +1,7 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
 apply plugin: 'realm-android'
+apply plugin: 'kotlin-kapt'
 
 def gitSha = 'git rev-parse --short HEAD'.execute([], project.rootDir).text.trim()
 def buildTime = new Date().format("yyyy-MM-dd'T'HH:mm'Z'", TimeZone.getTimeZone("UTC"))
@@ -144,4 +146,8 @@ dependencies {
 
     //Zoomable image view
     compile 'com.github.chrisbanes:PhotoView:2.1.3'
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
+repositories {
+    mavenCentral()
 }

android/app/src/main/java/org/fossasia/openevent/common/utils/SortOrder.java

@@ -20,31 +20,31 @@ public static String sortOrderSpeaker() {
         switch (SharedPreferencesUtil.getInt(ConstantStrings.PREF_SORT_SPEAKER, 0)) {
             case SORT_TYPE_FIRST:
                 //By NAME
-                return Speaker.NAME;
+                return Speaker.Companion.getNAME();
             case SORT_TYPE_SECOND:
                 //By ORGANISATION
-                return Speaker.ORGANISATION;
+                return Speaker.Companion.getORGANISATION();
             case SORT_TYPE_THIRD:
                 //By COUNTRY
-                return Speaker.COUNTRY;
+                return Speaker.Companion.getCOUNTRY();
             default:
-                return Speaker.NAME;
+                return Speaker.Companion.getNAME();
         }
     }
 
     public static String sortTypeSchedule() {
         switch (SharedPreferencesUtil.getInt(ConstantStrings.PREF_SORT_SCHEDULE, 2)) {
             case SORT_TYPE_FIRST:
                 //By TITLE
-                return Session.TITLE;
+                return Session.Companion.getTITLE();
             case SORT_TYPE_SECOND:
                 //By TRACKS
-                return Session.TRACK;
+                return Session.Companion.getTRACK();
             case SORT_TYPE_THIRD:
                 //By START_TIME
-                return Session.START_TIME;
+                return Session.Companion.getSTART_TIME();
             default:
-                return Session.START_TIME;
+                return Session.Companion.getSTART_TIME();
         }
     }
 

android/app/src/main/java/org/fossasia/openevent/core/auth/ChangePasswordActivityViewModel.java

@@ -75,7 +75,7 @@ public LiveData<Integer> changePassword(String newPassword) {
         int id;
         try {
             id = JWTUtils.getIdentity(AuthUtil.getAuthorization());
-            compositeDisposable.add(APIClient.getOpenEventAPI().updateUser(User.builder().id(id).password(newPassword).build(), id)
+            compositeDisposable.add(APIClient.getOpenEventAPI().updateUser(User.Companion.builder().id(id).password(newPassword).build(), id)
                     .subscribeOn(Schedulers.io())
                     .observeOn(AndroidSchedulers.mainThread())
                     .flatMapCompletable(user -> RealmDataRepository

android/app/src/main/java/org/fossasia/openevent/core/auth/SignUpActivityViewModel.java

@@ -36,7 +36,7 @@ public LiveData<Integer> signUpUser(String email, String password) {
         if (signUpResponse == null) {
             signUpResponse = new MutableLiveData<>();
         }
-        compositeDisposable.add(APIClient.getOpenEventAPI().signUp(User.builder().email(email).password(password).build())
+        compositeDisposable.add(APIClient.getOpenEventAPI().signUp(User.Companion.builder().email(email).password(password).build())
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(user -> {

android/app/src/main/java/org/fossasia/openevent/core/auth/model/ImageResponse.kt

@@ -0,0 +1,3 @@
+package org.fossasia.openevent.core.auth.model
+
+data class ImageResponse ( var url: String )

android/app/src/main/java/org/fossasia/openevent/core/auth/model/Login.kt

@@ -0,0 +1,3 @@
+package org.fossasia.openevent.core.auth.model
+
+data class Login(var email: String?, var password: String?)

android/app/src/main/java/org/fossasia/openevent/core/auth/model/LoginResponse.kt

@@ -0,0 +1,7 @@
+package org.fossasia.openevent.core.auth.model
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategy
+import com.fasterxml.jackson.databind.annotation.JsonNaming
+
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy::class)
+data class LoginResponse ( var accessToken: String? = null )

android/app/src/main/java/org/fossasia/openevent/core/auth/model/UploadImage.kt

@@ -0,0 +1,3 @@
+package org.fossasia.openevent.core.auth.model
+
+data class UploadImage(var data: String?)