Fix #5133 Audio language name showing two times

app/src/main/java/org/oppia/android/app/player/audio/AudioFragmentPresenter.kt

@@ -15,7 +15,6 @@ import androidx.lifecycle.Observer
 import androidx.lifecycle.Transformations
 import org.oppia.android.R
 import org.oppia.android.app.fragment.FragmentScope
-import org.oppia.android.app.model.AudioLanguage
 import org.oppia.android.app.model.CellularDataPreference
 import org.oppia.android.app.model.Profile
 import org.oppia.android.app.model.ProfileId
@@ -168,20 +167,6 @@ class AudioFragmentPresenter @Inject constructor(
     )
   }
 
-  /** Gets language code by [AudioLanguage]. */
-  private fun getAudioLanguage(audioLanguage: AudioLanguage): String {
-    return when (audioLanguage) {
-      AudioLanguage.HINDI_AUDIO_LANGUAGE -> "hi"
-      AudioLanguage.FRENCH_AUDIO_LANGUAGE -> "fr"
-      AudioLanguage.CHINESE_AUDIO_LANGUAGE -> "zh"
-      AudioLanguage.BRAZILIAN_PORTUGUESE_LANGUAGE -> "pt"
-      AudioLanguage.ARABIC_LANGUAGE -> "ar"
-      AudioLanguage.NIGERIAN_PIDGIN_LANGUAGE -> "pcm"
-      AudioLanguage.NO_AUDIO, AudioLanguage.UNRECOGNIZED, AudioLanguage.AUDIO_LANGUAGE_UNSPECIFIED,
-      AudioLanguage.ENGLISH_AUDIO_LANGUAGE -> "en"
-    }
-  }
-
   private fun processGetProfileResult(profileResult: AsyncResult<Profile>): String {
     val profile = when (profileResult) {
       is AsyncResult.Failure -> {
@@ -191,7 +176,7 @@ class AudioFragmentPresenter @Inject constructor(
       is AsyncResult.Pending -> Profile.getDefaultInstance()
       is AsyncResult.Success -> profileResult.value
     }
-    return getAudioLanguage(profile.audioLanguage)
+    return viewModel.getAudioLanguage(profile.audioLanguage)
   }
 
   /** Sets selected language code in presenter and ViewModel. */

app/src/main/java/org/oppia/android/app/player/audio/AudioViewModel.kt

@@ -6,6 +6,7 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.Transformations
 import org.oppia.android.R
 import org.oppia.android.app.fragment.FragmentScope
+import org.oppia.android.app.model.AudioLanguage
 import org.oppia.android.app.model.State
 import org.oppia.android.app.model.Voiceover
 import org.oppia.android.app.model.VoiceoverMapping
@@ -91,12 +92,18 @@ class AudioViewModel @Inject constructor(
     val targetContentId = contentId ?: state.content.contentId
     val voiceoverMapping =
       state.recordedVoiceoversMap[targetContentId] ?: VoiceoverMapping.getDefaultInstance()
-
     autoPlay = allowAutoPlay
     this.reloadingMainContent = reloadingMainContent
     voiceoverMap = voiceoverMapping.voiceoverMappingMap
     currentContentId = targetContentId
-    languages = voiceoverMap.keys.toList().map { machineLocale.run { it.toMachineLowerCase() } }
+    languages = voiceoverMap.keys.toList().filter {
+      it in getSupportedLanguageCodes()
+    }.map {
+      machineLocale.run {
+        it.toMachineLowerCase()
+      }
+    }
+
     selectedLanguageUnavailable.set(false)
 
     val localeLanguageCode =
@@ -123,6 +130,32 @@ class AudioViewModel @Inject constructor(
     }
   }
 
+  /** Gets language code by [AudioLanguage]. */
+  fun getAudioLanguage(audioLanguage: AudioLanguage): String {
+    return when (audioLanguage) {
+      AudioLanguage.HINDI_AUDIO_LANGUAGE -> "hi"
+      AudioLanguage.FRENCH_AUDIO_LANGUAGE -> "fr"
+      AudioLanguage.CHINESE_AUDIO_LANGUAGE -> "zh"
+      AudioLanguage.BRAZILIAN_PORTUGUESE_LANGUAGE -> "pt"
+      AudioLanguage.ARABIC_LANGUAGE -> "ar"
+      AudioLanguage.NIGERIAN_PIDGIN_LANGUAGE -> "pcm"
+      AudioLanguage.NO_AUDIO,
+      AudioLanguage.UNRECOGNIZED,
+      AudioLanguage.AUDIO_LANGUAGE_UNSPECIFIED,
+      AudioLanguage.ENGLISH_AUDIO_LANGUAGE -> "en"
+    }
+  }
+
+  fun getSupportedLanguageCodes(): List<String> {
+    val supportedAudioLanguageCodes = AudioLanguage.values()
+      .map { audioLanguage ->
+        getAudioLanguage(audioLanguage)
+      }
+      .toMutableList()
+    supportedAudioLanguageCodes.add("hi-en")
+    return supportedAudioLanguageCodes
+  }
+
   /** Sets language code for data binding and changes data source to correct audio. */
   fun setAudioLanguageCode(languageCode: String) {
     selectedLanguageCode = languageCode