Settings for deltas

app/src/main/java/info/nightscout/androidaps/data/GlucoseStatus.java

@@ -1,5 +1,7 @@
 package info.nightscout.androidaps.data;
 
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
 import android.support.annotation.Nullable;
 import android.text.Html;
 import android.text.Spanned;
@@ -25,6 +27,7 @@ public class GlucoseStatus {
     public double short_avgdelta = 0d;
     public double long_avgdelta = 0d;
 
+
     @Override
     public String toString() {
         return MainApp.sResources.getString(R.string.glucose) + " " + DecimalFormatter.to0Decimal(glucose) + " mg/dl\n" +
@@ -54,6 +57,8 @@ public class GlucoseStatus {
 
     @Nullable
     public static GlucoseStatus getGlucoseStatusData() {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(MainApp.instance());
+
         // load 45min
         long fromtime = (long) (new Date().getTime() - 60 * 1000L * 45);
         List<BgReading> data = MainApp.getDbHelper().getBgreadingsDataFromTime(fromtime, false);
@@ -104,8 +109,15 @@ public class GlucoseStatus {
 
         GlucoseStatus status = new GlucoseStatus();
         status.glucose = now.value;
-        status.delta = average(last_deltas);
+
         status.short_avgdelta = average(short_deltas);
+
+        if(prefs.getBoolean("always_use_shortavg",false) || (last_deltas.isEmpty() && prefs.getBoolean("default_to_shortavg",false))){
+            status.delta = status.short_avgdelta;
+        } else {
+            status.delta = average(last_deltas);
+        }
+
         status.long_avgdelta = average(long_deltas);
         status.avgdelta = status.short_avgdelta; // for OpenAPS MA
 

app/src/main/res/values/strings.xml

@@ -448,4 +448,9 @@
     <string name="wear_shortname">WEAR</string>
     <string name="smscommunicator_shortname">SMS</string>
     <string name="short_tabtitles">Shorten tab titles</string>
+    <string name="prefs_delta_title">Delta Settings</string>
+    <string name="default_to_shortavg">Default to short average delta</string>
+    <string name="default_to_shortavg_summary">Use short average delta when simple delta cannot be computed.</string>
+    <string name="always_use_shortavg">Always use short average delta instead of simple delta</string>
+    <string name="always_use_shortavg_summary">Useful when data from unfiltered sources like xDrip gets noisy.</string>
 </resources>

app/src/main/res/xml/pref_openapsma.xml

@@ -30,6 +30,18 @@
             android:key="openapsma_max_iob"
             android:numeric="decimal"
             android:title="@string/openapsma_maxiob_summary" />
+        <PreferenceScreen
+            android:title="@string/prefs_delta_title">
+            <SwitchPreference
+                android:defaultValue="false"
+                android:key="default_to_shortavg"
+                android:title="@string/default_to_shortavg"
+                android:summary="@string/default_to_shortavg_summary"/>
+            <SwitchPreference
+                android:defaultValue="false"
+                android:key="always_use_shortavg"
+                android:title="@string/always_use_shortavg"
+                android:summary="@string/always_use_shortavg_summary"/>
+        </PreferenceScreen>
     </PreferenceCategory>
-
 </PreferenceScreen>