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

Fixes #1392.

src/main/res/values/settings.xml

@@ -235,6 +235,8 @@
         <item>1.2</item>
         <item>1.3</item>
     </string-array>
+    <string name="voice_on_device_speaker_key" translatable="false">voiceOnDeviceSpeaker</string>
+    <bool name="voice_on_device_speaker_default" translatable="false">true</bool>
     <string name="voice_announce_total_distance_key" translatable="false">voiceAnnounceTotalDistance</string>
     <string name="voice_announce_moving_time_key" translatable="false">voiceAnnounceMovingTime</string>
     <string name="voice_announce_average_speed_pace_key" translatable="false">voiceAnnounceAverageSpeedPace</string>

src/main/res/values/strings.xml

@@ -575,6 +575,7 @@ limitations under the License.
         <item quantity="one">1 knot</item>
         <item quantity="other">%1$.1f knots</item>
     </plurals>
+    <string name="voice_on_device_speaker_title">Use the device\'s speaker</string>
     <string name="voice_per_kilometer">per kilometer</string>
     <string name="voice_per_mile">per mile</string>
     <string name="voice_per_nautical_mile">per nautical mile</string>

src/main/res/xml/settings_announcements.xml

@@ -26,6 +26,10 @@
         android:title="@string/menu_voice_rate"
         app:useSimpleSummaryProvider="true" />
 
+    <CheckBoxPreference
+        android:defaultValue="@bool/voice_on_device_speaker_default"
+        android:key="@string/voice_on_device_speaker_key"
+        android:title="@string/voice_on_device_speaker_title" />
     <PreferenceCategory android:title="@string/settings_announcements_title">
 
         <SwitchPreference