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    <p>You could store a single <code>byte</code> to represent your week and pull values out of it using a bitwise <code>&amp;</code> operation. Bit 1 could represent Monday, Bit 2 Tuesday, etc. You can use this to represent all combinations of days, e.g:</p> <pre><code>01100000 - Saturday/Sunday (Weekend) 01110001 - Friday/Saturday/Sunday/Monday (Long weekend) </code></pre> <p>When reading the value you would use something like:</p> <pre><code>byte val = 0x71; //01110001 boolean mondayActive = (val &amp; 0x1) == 1; boolean fridayActive = (val &gt;&gt; 4&amp; 0x1) == 1; </code></pre> <p><strong>EDIT comment</strong><br/> This assumes that you are already familiar with the <a href="http://developer.android.com/reference/android/app/AlarmManager.html" rel="nofollow">AlarmManager</a> and were looking for a mechanism to track your alarms as you cannot use a single alarm to schedule events in the manner the OP described. If you need to mimic cron in a single task, possibly take a look at something like the <a href="http://hub.buzzbox.com/android-sdk/scheduler" rel="nofollow">BuzzBox</a> SDK.</p> <p><strong>EDIT write sample</strong></p> <pre><code>public static final int MONDAY = 0x01; //00000001 public static final int TUESDAY = 0x02; //00000010 public static final int WEDNESDAY = 0x04; //00000100 public static final int THURSDAY = 0x08; //00001000 public static final int FRIDAY = 0x10; //00010000 public static final int SATURDAY = 0x20; //00100000 public static final int SUNDAY = 0x40; //01000000 //example values to write int weekend = SATURDAY | SUNDAY; //01100000 int longWeekend = FRIDAY | SATURDAY | SUNDAY | MONDAY; //01110001 //and as per flightplanner's comment, to read boolean mondayActive = (weekend &amp; MONDAY) == MONDAY; //false mondayActive = (longWeekend &amp; MONDAY) == MONDAY; //true </code></pre>
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    1. CO+1 I'd also use basically use this method, although I think the code's easier to read if you declare some constants for each day of the week, so for example `public static final int MONDAY = 0x01;` `public static final int TUESDAY = 0x02;` and then do the test as `boolean mondayActive = val & MONDAY == MONDAY`. This is also slightly more efficient as it saves the bit shift.
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    2. COTotally agree, both about using constants and losing the bit shifts. The example code was to make it clear what was going on as some developers are less familiar with bitwise operators.
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    3. COGreat answer, as well as the BuzzBox SDK. I guess with the byte representation, this could easily be stored in the DB and just grabbed and processed in order to know when the alarm should be created! Thanks!
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