Created DurationUtils and toast message shows after scheduling alarm

app/src/main/java/com/philliphsu/clock2/editalarm/EditAlarmActivity.java

@@ -26,6 +26,7 @@ import com.philliphsu.clock2.BaseActivity;
 import com.philliphsu.clock2.DaysOfWeek;
 import com.philliphsu.clock2.R;
 import com.philliphsu.clock2.model.AlarmsRepository;
+import com.philliphsu.clock2.util.DurationUtils;
 
 import java.util.Date;
 
@@ -421,6 +422,9 @@ public class EditAlarmActivity extends BaseActivity implements
     @Override
     public void scheduleAlarm(Alarm alarm) {
         AlarmUtils.scheduleAlarm(this, alarm);
+        String message = getString(R.string.alarm_set_for,
+                DurationUtils.toString(this, alarm.ringsIn(), false /*abbreviate?*/));
+        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
     }
 
     @Override

app/src/main/java/com/philliphsu/clock2/util/DurationUtils.java

@@ -0,0 +1,125 @@
+package com.philliphsu.clock2.util;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import android.support.annotation.StringRes;
+
+import com.philliphsu.clock2.R;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Created by Phillip Hsu on 6/6/2016.
+ */
+public class DurationUtils {
+
+    public static String toString(Context context, long millis, boolean abbreviate) {
+        long[] fields = breakdown(millis);
+        long numHours = fields[0];
+        long numMins = fields[1];
+        long numSecs = fields[2]; // only considered for rounding of minutes
+        if (numSecs >= 31) {
+            numMins++;
+        }
+
+        @StringRes int res;
+
+        if (abbreviate) {
+            if (numHours == 0) {
+                if (numMins == 0) {
+                    res = R.string.abbrev_less_than_one_minute; // TODO: verify formatArgs can be passed in but are ignored
+                } else {
+                    res = R.string.abbrev_minutes;
+                }
+            } else {
+                if (numMins == 0) {
+                    res = R.string.abbrev_hours;
+                } else {
+                    res = R.string.abbrev_hours_and_minutes;
+                }
+            }
+        } else {
+            if (numHours == 0) {
+                if (numMins == 0) {
+                    res = R.string.less_than_one_minute; // TODO: verify formatArgs can be passed in but are ignored
+                } else if (numMins == 1) {
+                    res = R.string.minute;
+                } else {
+                    res = R.string.minutes;
+                }
+            } else {
+                if (numHours == 1) {
+                    if (numMins == 0) {
+                        res = R.string.hour;
+                    } else if (numMins == 1) {
+                        res = R.string.hour_and_minute;
+                    } else {
+                        res = R.string.hour_and_minutes;
+                    }
+                } else {
+                    if (numMins == 0) {
+                        res = R.string.hours;
+                    } else if (numMins == 1) {
+                        res = R.string.hours_and_minute;
+                    } else {
+                        res = R.string.hours_and_minutes;
+                    }
+                }
+            }
+        }
+        
+        return context.getString(res, numHours, numMins);
+    }
+
+    /**
+     * Equivalent to
+     * {@link #breakdown(long, TimeUnit, boolean)
+     * breakdown(millis, TimeUnit.MILLISECONDS, true)},
+     * which rounds milliseconds. Callers who use this are probably not
+     * concerned about displaying the milliseconds value.
+     */
+    public static long[] breakdown(long millis) {
+        return breakdown(millis, TimeUnit.MILLISECONDS, true);
+    }
+
+    /**
+     * Equivalent to
+     * {@link #breakdown(long, TimeUnit, boolean) breakdown(t, unit, false)},
+     * i.e. does not round milliseconds.
+     */
+    public static long[] breakdown(long t, @NonNull TimeUnit unit) {
+        return breakdown(t, unit, false);
+    }
+
+    /**
+     * Returns a breakdown of a given time into its values
+     * in hours, minutes, seconds and milliseconds.
+     * @param t the time to break down
+     * @param unit the {@link TimeUnit} the given time is expressed in
+     * @param roundMillis whether rounding of milliseconds is desired
+     * @return a {@code long[]} of the values in hours, minutes, seconds
+     *         and milliseconds in that order
+     */
+    public static long[] breakdown(long t, @NonNull TimeUnit unit, boolean roundMillis) {
+        long hours = unit.toHours(t);
+        long minutes = unit.toMinutes(t) % 60;
+        long seconds = unit.toSeconds(t) % 60;
+        long msecs = unit.toMillis(t) % 1000;
+        if (roundMillis) {
+            if (msecs >= 500) {
+                seconds++;
+                msecs = 0;
+                if (seconds == 60) {
+                    minutes++;
+                    seconds = 0;
+                    if (minutes == 60) {
+                        hours++;
+                        minutes = 0;
+                    }
+                }
+            }
+        }
+        return new long[] { hours, minutes, seconds, msecs };
+    }
+
+}

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

@@ -16,6 +16,24 @@
     <string name="title_snoozing_until">Snoozing until %1$s</string>
     <string name="dismiss_now">Dismiss now</string>
     <string name="done_snoozing">Done snoozing</string>
+    <string name="alarm_set_for">Alarm set for %1$s from now.</string>
+    <!-- ======================================================================================= -->
+
+    <!-- ==================================== TOASTS ==================================== -->
+    <string name="hour_and_minute">%1$d hour and %2$d minute</string>
+    <string name="hour_and_minutes">%1$d hour and %2$d minutes</string>
+    <string name="hours_and_minute">%1$d hours and %2$d minute</string>
+    <string name="hours_and_minutes">%1$d hours and %2$d minutes</string>
+    <string name="hour">%1$d hour</string>
+    <string name="hours">%1$d hours</string>
+    <string name="minute">%2$d minute</string>
+    <string name="minutes">%2$d minutes</string>
+    <string name="less_than_one_minute">less than 1 minute</string>
+
+    <string name="abbrev_hours_and_minutes">%1$dh %2$dm</string>
+    <string name="abbrev_hours">%1$dh</string>
+    <string name="abbrev_minutes">%2$dm</string>
+    <string name="abbrev_less_than_one_minute">&lt;1m</string>
     <!-- ======================================================================================= -->
     
     <!-- ==================================== NOTIFICATIONS ==================================== -->