format nap duration in widget

Napply/src/fr/miximum/napply/NapplyWidget.java

@@ -36,6 +36,7 @@
 import java.text.DateFormat;
 import java.util.Calendar;
 import java.util.Date;
+import java.util.Formatter;
 import java.util.GregorianCalendar;
 import java.util.Map;
 
@@ -344,7 +345,7 @@ static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
         // Prepare widget views
         int napDuration = getNapDuration(context, appWidgetId);
         RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.napply_widget_layout);
-        views.setTextViewText(R.id.nap_time, "" + napDuration);
+        views.setTextViewText(R.id.nap_time, formatNapDuration(napDuration));
         views.setTextViewText(R.id.nap_end, napLabel);
 
         // Prepare intent to launch alarm on widget click
@@ -375,4 +376,24 @@ static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
         String napLabel = context.getString(R.string.default_widget_label);
         updateAppWidget(context, appWidgetManager, appWidgetId, napLabel);
     }
+
+    /**
+     * Format the nap duration string
+     * @param napDuration The nap duration in minutes
+     * @return the formated duration «hour:minute»
+     */
+    public static String formatNapDuration(int napDuration) {
+        String formatted = "";
+        int hours = napDuration / 60;
+        int minutes = napDuration - (60 * hours);
+
+        Formatter f = new Formatter();
+        formatted = f.format("%02d", minutes).out().toString();
+
+        if (hours > 0) {
+            formatted = "" + hours + ":" + formatted;
+        }
+
+        return formatted;
+    }
 }

NapplyTest/src/fr/miximum/napply/tests/NapplyWidgetTest.java

@@ -0,0 +1,15 @@
+package fr.miximum.napply.tests;
+
+import fr.miximum.napply.NapplyWidget;
+import junit.framework.TestCase;
+
+public class NapplyWidgetTest extends TestCase {
+
+    public void testFormatNapDuration() {
+        assertEquals("25", NapplyWidget.formatNapDuration(25));
+        assertEquals("59", NapplyWidget.formatNapDuration(59));
+        assertEquals("05", NapplyWidget.formatNapDuration(5));
+        assertEquals("2:00", NapplyWidget.formatNapDuration(120));
+        assertEquals("2:45", NapplyWidget.formatNapDuration(165));
+    }
+}