Voice announcement: make rate configurable.

Fixes #777.

src/main/java/de/dennisguse/opentracks/services/tasks/AnnouncementPeriodicTask.java

@@ -25,13 +25,11 @@ import android.util.Log;
 
 import androidx.annotation.NonNull;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Locale;
 
 import de.dennisguse.opentracks.content.data.Distance;
 import de.dennisguse.opentracks.content.data.Track;
-import de.dennisguse.opentracks.content.data.TrackPoint;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.services.TrackRecordingService;
@@ -47,11 +45,6 @@ import de.dennisguse.opentracks.viewmodels.IntervalStatistics;
  */
 public class AnnouncementPeriodicTask implements PeriodicTask {
 
-    /**
-     * The rate at which announcements are spoken.
-     */
-    private static final float TTS_SPEECH_RATE = 0.9f;
-
     private static final String TAG = AnnouncementPeriodicTask.class.getSimpleName();
 
     private final Context context;
@@ -213,10 +206,7 @@ public class AnnouncementPeriodicTask implements PeriodicTask {
              */
         }
         tts.setLanguage(locale);
-
-        // Slow down the speed just a bit as it is hard to hear when exercising.
-        tts.setSpeechRate(TTS_SPEECH_RATE);
-
+        tts.setSpeechRate(PreferencesUtils.getVoiceSpeedRate(PreferencesUtils.getSharedPreferences(context), context));
         tts.setOnUtteranceProgressListener(utteranceListener);
     }