Option to disable buffering (fix #411)

app/src/main/res/xml/preferences.xml

@@ -31,22 +31,29 @@
     <EditTextPreference
         android:defaultValue="300"
         android:key="interval"
-        android:numeric="integer"
+        android:inputType="number"
         android:summary="@string/settings_interval_summary"
         android:title="@string/settings_interval_title" />
 
     <EditTextPreference
         android:defaultValue="0"
         android:key="distance"
-        android:numeric="integer"
+        android:inputType="number"
         android:summary="@string/settings_distance_summary"
         android:title="@string/settings_distance_title" />
 
     <EditTextPreference
         android:defaultValue="0"
         android:key="angle"
-        android:numeric="integer"
+        android:inputType="number"
         android:summary="@string/settings_angle_summary"
         android:title="@string/settings_angle_title" />
 
+    <CheckBoxPreference
+        android:defaultValue="true"
+        android:key="buffer"
+        android:summaryOff="@string/settings_buffer_off_summary"
+        android:summaryOn="@string/settings_buffer_on_summary"
+        android:title="@string/settings_buffer" />
+
 </PreferenceScreen>