fix COURSE tab lateinit crash: guard refreshCurrentUi by module and loadRemoteVideo

android/sample-app/src/main/java/cn/learningpad/oraltrainer/sample/MainActivity.kt

@@ -1678,6 +1678,7 @@ class MainActivity : Activity() {
     }
 
     private fun refreshCurrentUi() {
+        if (activeModule != Module.TRAIN && activeModule != Module.TEST) return
         if (!::lessonTitleText.isInitialized) return
         val item = controller.currentTrainingItem()
         lessonTitleText.text = item?.title ?: "未选择课程"
@@ -1916,10 +1917,10 @@ class MainActivity : Activity() {
 
     private fun loadRemoteVideo(video: TrainingVideoSummary) {
         activeItemId = video.videoHash
-        lessonTitleText.text = video.title
-        sentenceMetaText.text = "句子边界加载中"
-        sentenceText.text = video.title
-        statusText.text = "正在加载云端课程..."
+        if (::lessonTitleText.isInitialized) lessonTitleText.text = video.title
+        if (::sentenceMetaText.isInitialized) sentenceMetaText.text = "句子边界加载中"
+        if (::sentenceText.isInitialized) sentenceText.text = video.title
+        if (::statusText.isInitialized) statusText.text = "正在加载云端课程..."
         renderCatalog()
 
         val loadingItem = video.toTrainingMediaItem()