Only enable voicemail transcription on android O and later

Bug: 65648343
Test: updated unit tests (already submitted in previous cl)
PiperOrigin-RevId: 169280819
Change-Id: I5950087765ffd038c31b872c6468951472980407
diff --git a/java/com/android/dialer/app/voicemail/error/VoicemailTosMessageCreator.java b/java/com/android/dialer/app/voicemail/error/VoicemailTosMessageCreator.java
index 9b3bbd0..f5ea95d 100644
--- a/java/com/android/dialer/app/voicemail/error/VoicemailTosMessageCreator.java
+++ b/java/com/android/dialer/app/voicemail/error/VoicemailTosMessageCreator.java
@@ -22,6 +22,7 @@
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.preference.PreferenceManager;
 import android.support.annotation.Nullable;
 import android.telecom.PhoneAccountHandle;
@@ -139,7 +140,8 @@
   }
 
   private boolean isVoicemailTranscriptionEnabled() {
-    return ConfigProviderBindings.get(context).getBoolean("voicemail_transcription_enabled", false);
+    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
+        && ConfigProviderBindings.get(context).getBoolean("voicemail_transcription_enabled", false);
   }
 
   private void showDeclineTosDialog(final PhoneAccountHandle handle) {
diff --git a/java/com/android/voicemail/impl/transcribe/TranscriptionConfigProvider.java b/java/com/android/voicemail/impl/transcribe/TranscriptionConfigProvider.java
index 83f04da..4bb9a26 100644
--- a/java/com/android/voicemail/impl/transcribe/TranscriptionConfigProvider.java
+++ b/java/com/android/voicemail/impl/transcribe/TranscriptionConfigProvider.java
@@ -16,6 +16,7 @@
 package com.android.voicemail.impl.transcribe;
 
 import android.content.Context;
+import android.os.Build;
 import com.android.dialer.configprovider.ConfigProviderBindings;
 
 /** Provides configuration values needed to connect to the transcription server. */
@@ -27,7 +28,8 @@
   }
 
   public boolean isVoicemailTranscriptionEnabled() {
-    return ConfigProviderBindings.get(context).getBoolean("voicemail_transcription_enabled", false);
+    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
+        && ConfigProviderBindings.get(context).getBoolean("voicemail_transcription_enabled", false);
   }
 
   public String getServerAddress() {