Voice announcements: added setting to skip announcements on the device's internal speaker.

Fixes #1392.

src/main/java/de/dennisguse/opentracks/services/TrackRecordingService.java

@@ -327,7 +327,7 @@ public class TrackRecordingService extends Service implements TrackPointCreator.
         TrackPoint trackPoint = data.second.first;
         egm2008CorrectionManager.correctAltitude(this, trackPoint);
 
-        localVoiceAnnouncementManager.update(data.first);
+        localVoiceAnnouncementManager.update(this, data.first);
 
         recordingDataObservable.postValue(new RecordingData(data.first, trackPoint, data.second.second));
     }

src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementManager.java

@@ -15,12 +15,14 @@
  */
 package de.dennisguse.opentracks.services.announcement;
 
+import android.content.Context;
 import android.content.SharedPreferences;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
+import androidx.mediarouter.media.MediaRouter;
 
 import java.time.Duration;
 
@@ -73,12 +75,20 @@ public class VoiceAnnouncementManager implements SharedPreferences.OnSharedPrefe
         updateNextTaskDistance();
     }
 
-    public void update(@NonNull Track track) {
+    public void update(@NonNull Context context, @NonNull Track track) {
         if (voiceAnnouncement == null) {
             Log.e(TAG, "Cannot update when in status shutdown.");
             return;
         }
 
+        if (!PreferencesUtils.shouldVoiceAnnouncementOnDeviceSpeaker()
+                && MediaRouter.getInstance(context)
+                .getSelectedRoute()
+                .isDeviceSpeaker()) {
+            Log.i(TAG, "No voice announcement on device speaker.");
+            return;
+        }
+
         boolean announce = false;
         this.trackStatistics = track.getTrackStatistics();
         if (trackStatistics.getTotalDistance().greaterThan(nextTotalDistance)) {

src/main/java/de/dennisguse/opentracks/settings/PreferencesUtils.java

@@ -302,6 +302,11 @@ public class PreferencesUtils {
         return getBoolean(R.string.stats_fullscreen_while_recording_key, DEFAULT);
     }
 
+    public static boolean shouldVoiceAnnouncementOnDeviceSpeaker() {
+        final boolean DEFAULT = resources.getBoolean(R.bool.voice_on_device_speaker_default);
+        return getBoolean(R.string.voice_on_device_speaker_key, DEFAULT);
+    }
+
     public static Duration getVoiceAnnouncementFrequency() {
         final int DEFAULT = Integer.parseInt(resources.getString(R.string.voice_announcement_frequency_default));
         int value = getInt(R.string.voice_announcement_frequency_key, DEFAULT);