"Reflection" is an old computer language term. Think of it as
referring to the ability of a language to see itself, as in a mirror.
Languages such as C and C++ don't have it. Java, Lisp, and many
scripting languages do.
On Feb 25, 8:46 pm, "Nick Owens" <nicow...@gmail.com> wrote:
> All:
>
> So I realized my date/time is already formatted by time zone and re-adding
> the default time zone was subtracting the time zone offset again from the
> time! So, new code to replace the formatting function is below:
>
> Date date = df.parse(dateTime);
>
> if (sdk < 3) {
>
> finalDateTime = df.format(date);
>
> } else {
>
> finalDateTime = DateUtils.getRelativeDateTimeString(this,
> date.getTime(), dateMin, dateMax, dateFlags).toString();
>
> }
>
> So, why is it called "reflection" anyways? Is it like "reflecting" on all
> those previous SDK versions and thinking about the special times we had w/
> them?
>
> Thanks,
> Nick Owens
> VP, ThreeClix
> Office: (904) 429-7039
> Mobile: (847) 565-9392
> After Hours: (904) 540-5830
>
>
>
> -----Original Message-----
> From: Nick Owens [mailto:nicow...@gmail.com]
> Sent: Thursday, February 25, 2010 5:38 PM
> To: 'android-developers@googlegroups.com'
> Subject: RE: [android-developers] Re: FormatDateTime
>
> Mark (et. al. interested parties):
>
> Thank you for the example on reflection. I got it working and thought it
> might be prudent to share my results w/ the world so the completed code is
> below. For the record, this date value (as a string) is being retrieved
> from a SQLite database and the function formatDateTime() is used in a custom
> adapter for display of the date for each record in a ListView.
>
> This compiles in Eclipse using Android 1.5. This allows me to set a minimum
> sdk version of 2, while still utilizing this really nifty date display
> function.
>
> --------------------------------------------------------------------------- -
> ------------
> public class ResourcesList extends ListActivity {
>
> ...
>
> int sdk = new Integer(Build.VERSION.SDK).intValue();
>
> private static final long dateMin = 60000;
> private static final long dateMax = (86400000 * 2);
> private static final int dateFlags = 0;
>
> ...
>
> public String formatDateTime(String dateTime) {
>
> if (dateTime == null) {
>
> return "Never";
>
> } else {
>
> String finalDateTime;
>
> DateFormat df = new SimpleDateFormat("yyyy-MM-dd
> HH:mm:ss");
>
> try {
>
> Date date = df.parse(dateTime);
>
> if (sdk < 3) {
>
> finalDateTime = df.format(date);
>
> } else {
>
> long when = date.getTime();
>
> finalDateTime =
> DateUtils.getRelativeDateTimeString(this, (when +
> TimeZone.getDefault().getOffset(when)), dateMin, dateMax,
> dateFlags).toString();
>
> }
>
> } catch (Exception e) {
>
> finalDateTime = "Unknown";
>
> }
>
> return finalDateTime;
>
> }
>
> }
>
> ...
>
> }
>
> Thanks,
> Nick Owens
> VP, ThreeClix
> Office: (904) 429-7039
> Mobile: (847) 565-9392
> After Hours: (904) 540-5830
>
> -----Original Message-----
> From: android-developers@googlegroups.com
> [mailto:android-develop...@googlegroups.com] On Behalf Of Mark Murphy
> Sent: Thursday, February 25, 2010 4:23 PM
> To: android-developers@googlegroups.com
> Subject: Re: [android-developers] Re: FormatDateTime
>
> Nick Owens wrote:
> > On another note, is it possible to provide a conditional instruction for
> > formatting date/time based on the user's Android package:
>
> > if (package > 1.1) {
>
> > //cooler date time format
>
> > } else {
>
> > //regular date time format
>
> > }
>
> Yes, either via reflection or via conditional class loading.
>
> > Let me guess? It is technically possible, but not in Eclipse since
> Eclipse
> > won't even let it compile w/ a function that doesn't compile.
>
> No, it should work fine. However, you need to compile for the higher
> version.
>
> > Or can I
> > build it for Android 1.2 but allow users of 1.1 to download it by
> specifying
> > a different min-SDK level than it is built for?
>
> Dunno. What's Android 1.2? :-)
>
> > If so, can I write a
> > conditional instruction based on the device's SDK level?
>
> Yes, either via reflection or via conditional class loading.
>
> This was discussed here:
>
> http://stackoverflow.com/questions/2312321/how-to-use-contacts-api-fo...
> id-1-x-and-2-x-simultaneously
>
> and here:
>
> http://stackoverflow.com/questions/2044985/android-contactscontract-a...
> ding-across-multiple-sdk-versions
>
> Some sample projects are here:
>
> http://github.com/commonsguy/cw-advandroid/tree/master/Contacts/Pick/http://github.com/commonsguy/cw-advandroid/tree/master/Contacts/Spinn...
>
> First one uses reflection, second one uses conditional class loading.
>
> Here are two more samples:
>
> http://github.com/commonsguy/cw-android/tree/master/APIVersions/
>
> --
> Mark Murphy (a Commons
> Guy)http://commonsware.com|http://twitter.com/commonsguy
>
> Warescription: Three Android Books, Plus Updates, One Low Price!
>
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