Make question marks optional

Fixes #96

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/list/views/CheckmarkButtonView.kt

@@ -114,7 +114,10 @@ class CheckmarkButtonView(
             val id = when (value) {
                 SKIP -> R.string.fa_skipped
                 NO -> R.string.fa_times
-                UNKNOWN -> R.string.fa_question
+                UNKNOWN -> {
+                    if(preferences.areQuestionMarksEnabled()) R.string.fa_question
+                    else R.string.fa_times
+                }
                 else -> R.string.fa_check
             }
             val label = resources.getString(id)

android/uhabits-android/src/main/java/org/isoron/uhabits/widgets/views/CheckmarkWidgetView.java

@@ -31,6 +31,7 @@ import org.isoron.uhabits.*;
 import org.isoron.uhabits.activities.habits.list.views.*;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.activities.common.views.*;
+import org.isoron.uhabits.core.preferences.*;
 import org.isoron.uhabits.utils.*;
 
 import static org.isoron.androidbase.utils.InterfaceUtils.getDimension;
@@ -53,6 +54,8 @@ public class CheckmarkWidgetView extends HabitWidgetView {
 
     protected boolean isNumerical;
 
+    private Preferences preferences;
+
     public CheckmarkWidgetView(Context context)
     {
         super(context);
@@ -121,7 +124,12 @@ public class CheckmarkWidgetView extends HabitWidgetView {
             case Checkmark.SKIP:
                 return getResources().getString(R.string.fa_skipped);
             case Checkmark.UNKNOWN:
+            {
+                if (preferences.areQuestionMarksEnabled())
                     return getResources().getString(R.string.fa_question);
+                else
+                    getResources().getString(R.string.fa_times);
+            }
             case Checkmark.NO:
             default:
                 return getResources().getString(R.string.fa_times);
@@ -196,6 +204,10 @@ public class CheckmarkWidgetView extends HabitWidgetView {
 
     private void init()
     {
+        HabitsApplicationComponent appComponent;
+        appComponent = (HabitsApplicationComponent) getContext().getApplicationContext();
+        preferences = appComponent.getPreferences();
+
         ring = (RingView) findViewById(R.id.scoreRing);
         label = (TextView) findViewById(R.id.label);
 

android/uhabits-android/src/main/res/values/strings.xml

@@ -203,4 +203,6 @@
     <string name="decrement">Decrement</string>
     <string name="pref_skip_title">Enable skip days</string>
     <string name="pref_skip_description">Toggle twice to add a skip instead of a checkmark. Skips keep your score unchanged and don\'t break your streak.</string>
+    <string name="pref_unknown_title">Show question marks for missing data</string>
+    <string name="pref_unknown_description">Differentiate days without data from actual lapses. To enter a lapse, toggle twice.</string>
 </resources>

android/uhabits-android/src/main/res/xml/preferences.xml

@@ -38,6 +38,13 @@
             android:title="@string/pref_skip_title"
             app:iconSpaceReserved="false" />
 
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="pref_unknown_enabled"
+            android:summary="@string/pref_unknown_description"
+            android:title="@string/pref_unknown_title"
+            app:iconSpaceReserved="false" />
+
         <CheckBoxPreference
                 android:defaultValue="false"
                 android:key="pref_checkmark_reverse_order"

android/uhabits-core/src/main/java/org/isoron/uhabits/core/preferences/Preferences.java

@@ -367,6 +367,10 @@ public class Preferences
         storage.putBoolean("pref_skip_enabled", value);
     }
 
+    public boolean areQuestionMarksEnabled()
+    {
+        return storage.getBoolean("pref_unknown_enabled", false);
+    }
 
     /**
      * @return An integer representing the first day of the week. Sunday