fix build process

Author: syakimchik

Samples/Advanced/DocumentReader-Kotlin/app/src/main/java/com/regula/documentreader/Helpers.kt

@@ -60,8 +60,8 @@ class Helpers {
             "Capture frame" to 2
         )
 
-        fun <T> listToString(list: List<T>, context: Context?): String {
-            if (list.isEmpty())
+        fun <T> listToString(list: List<T>?, context: Context?): String {
+            if (list?.isEmpty() == true)
                 return context!!.resources.getString(R.string.string_default)
             return list.toString().removeSurrounding("[", "]")
         }

Samples/Advanced/DocumentReader-Kotlin/app/src/main/java/com/regula/documentreader/MainActivity.kt

@@ -141,12 +141,12 @@ class MainActivity : FragmentActivity(), Serializable {
         }
 
     private fun onInitComplete() {
-        var currentScenario: String? = Instance().processParams().scenario
+        var currentScenario = Instance().processParams().scenario
         val scenarios: Array<String?> = arrayOfNulls(Instance().availableScenarios.size)
         for ((i, scenario) in Instance().availableScenarios.withIndex())
             scenarios[i] = scenario.name
-        if (currentScenario == null || currentScenario.isEmpty()) {
-            currentScenario = scenarios[0]
+        if (currentScenario.isEmpty()) {
+            currentScenario = scenarios[0] ?: ""
             Instance().processParams().scenario = currentScenario
         }
         binding.scenarioPicker.visibility = View.VISIBLE
@@ -156,7 +156,7 @@ class MainActivity : FragmentActivity(), Serializable {
         binding.scenarioPicker.value = scenarios.indexOf(currentScenario)
         binding.scenarioPicker.setOnValueChangedListener { _, _, newVal ->
             binding.scenarioPicker.performHapticFeedback(HapticFeedbackConstants.KEYBOARD_TAP)
-            Instance().processParams().scenario = scenarios[newVal]
+            Instance().processParams().scenario = scenarios[newVal] ?: ""
         }
 
         binding.recyclerView.visibility = View.VISIBLE

Samples/Advanced/DocumentReader-Kotlin/app/src/main/java/com/regula/documentreader/SettingsActivity.kt

@@ -289,8 +289,8 @@ class APISettingsFragment : Fragment() {
             Stepper(
                 "DPI threshold",
                 "",
-                { Instance().processParams().imageQA.dpiThreshold },
-                { Instance().processParams().imageQA.dpiThreshold = it },
+                { Instance().processParams().imageQA?.dpiThreshold },
+                { Instance().processParams().imageQA?.dpiThreshold = it },
                 step = 25,
                 addMinusOne = true
             )
@@ -299,33 +299,33 @@ class APISettingsFragment : Fragment() {
             Stepper(
                 "Angle threshold",
                 "",
-                { Instance().processParams().imageQA.angleThreshold },
-                { Instance().processParams().imageQA.angleThreshold = it },
+                { Instance().processParams().imageQA?.angleThreshold },
+                { Instance().processParams().imageQA?.angleThreshold = it },
             )
         )
         sectionsData.add(
             Switch(
                 "Focus check",
-                { Instance().processParams().imageQA.focusCheck },
-                { Instance().processParams().imageQA.focusCheck = it })
+                { Instance().processParams().imageQA?.focusCheck },
+                { Instance().processParams().imageQA?.focusCheck = it })
         )
         sectionsData.add(
             Switch(
                 "Glares check",
-                { Instance().processParams().imageQA.glaresCheck },
-                { Instance().processParams().imageQA.glaresCheck = it })
+                { Instance().processParams().imageQA?.glaresCheck },
+                { Instance().processParams().imageQA?.glaresCheck = it })
         )
         sectionsData.add(
             Switch(
                 "Colorness check",
-                { Instance().processParams().imageQA.colornessCheck },
-                { Instance().processParams().imageQA.colornessCheck = it })
+                { Instance().processParams().imageQA?.colornessCheck },
+                { Instance().processParams().imageQA?.colornessCheck = it })
         )
         sectionsData.add(
             Switch(
                 "Moire check",
-                { Instance().processParams().imageQA.moireCheck },
-                { Instance().processParams().imageQA.moireCheck = it })
+                { Instance().processParams().imageQA?.moireCheck },
+                { Instance().processParams().imageQA?.moireCheck = it })
         )
         sectionsData.add(Section("Restrictions"))
         sectionsData.add(
@@ -523,9 +523,9 @@ class APISettingsFragment : Fragment() {
             InputString(
                 "Document ID List",
                 {
-                    if (Instance().processParams().documentIDList == null || Instance().processParams().documentIDList.isEmpty())
+                    if (Instance().processParams().documentIDList == null || Instance().processParams().documentIDList?.isEmpty() == true)
                         return@InputString ""
-                    listToString(Instance().processParams().documentIDList.toList(), context)
+                    listToString(Instance().processParams().documentIDList?.toList(), context)
                 },
                 {
                     try {
@@ -538,9 +538,9 @@ class APISettingsFragment : Fragment() {
             InputString(
                 "Field type filter",
                 {
-                    if (Instance().processParams().fieldTypesFilter == null || Instance().processParams().fieldTypesFilter.isEmpty())
+                    if (Instance().processParams().fieldTypesFilter == null || Instance().processParams().fieldTypesFilter?.isEmpty() == true)
                         return@InputString ""
-                    listToString(Instance().processParams().fieldTypesFilter.toList(), context)
+                    listToString(Instance().processParams().fieldTypesFilter?.toList(), context)
                 },
                 {
                     try {