Thanks!
I forgot to include main.xml.
You may either remove the lines:
((TextView) findViewById(R.id.getdstsavings))
.setText("TimeZone.getDSTSavings() == " +
String.valueOf(getdstsavings));
((TextView) findViewById(R.id.caldstsavings))
.setText("GregorianCalendar DST_OFFSET == " +
String.valueOf(caldstsavings));
or change res/layout/main.xml to look like below:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/getdstsavings"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/caldstsavings"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
Also, the line:
cal.set(Calendar.MILLISECOND, 0);
can be deleted. It is irrelevant for the result.
Jan
On Jan 24, 1:13 pm, Mark Murphy <[email protected]> wrote:
> I know some tricks are played with the time zone database, compared to
> regular Java environments, simply for performance issues. It used to
> be the first time you used something that touched time zones that your
> app would freeze for a full second while the database was loaded. Now,
> they pre-load the time zone database in zygote and share it among all
> VMs. It's possible that there's a bug introduced in that process.
>
> I would file an issue on this at b.android.com, with a complete
> project containing your source code that demonstrates the error.
>
>
>
>
>
>
>
>
>
> On Tue, Jan 24, 2012 at 6:18 AM, Jan Skarvall <[email protected]> wrote:
> > Hi all
>
> > I have discovered a problem with getting correct DST saving value,
> > .
> > TimeZone.getDSTSavings() normally returns 3600000 (1 hour), but should
> > for timezone ID "Australia/Lord_Howe" return 1800000 (30 minutes).
> > (Seehttp://www.timeanddate.com/worldclock/clockchange.html?n=750)
>
> > I believe that GregorianCalendar uses TimeZone.getDSTSavings(), but
> > that is only my guess from looking at the source at
> >http://www.java2s.com/Open-Source/Android/android-core/platform-libco...
>
> > Now, if I instead of using TimeZone.getDSTSavings() looks att what
> > GregorianCalendar.get(Calendar.DST_OFFSET) returns, it is infact
> > 1800000 when DST is on, which the following App reveals:
>
> > package x.getdstavingsissue;
> > /*
> > * Result on Android 2.2 is:
> > * TimeZone.getDSTSavings() == 3600000
> > * GregorianCalendar DST_OFFSET == 1800000
> > */
> > import java.util.Calendar;
> > import java.util.TimeZone;
>
> > import android.app.Activity;
> > import android.os.Bundle;
> > import android.util.Log;
> > import android.widget.TextView;
>
> > public class GetDSTSavingsIssueActivity extends Activity {
> > /** Called when the activity is first created. */
> > @Override
> > public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
> > setContentView(R.layout.main);
> > Calendar cal =
> > Calendar.getInstance(TimeZone.getTimeZone("Australia/Lord_Howe"));
> > int getdstsavings = cal.getTimeZone().getDSTSavings();
> > cal.set(2012, 1, 1, 0, 0, 0);
> > cal.set(Calendar.MILLISECOND, 0);
> > int caldstsavings = cal.get(Calendar.DST_OFFSET);
> > ((TextView) findViewById(R.id.getdstsavings))
> > .setText("TimeZone.getDSTSavings() == " +
> > String.valueOf(getdstsavings));
> > ((TextView) findViewById(R.id.caldstsavings))
> > .setText("GregorianCalendar DST_OFFSET == " +
> > String.valueOf(caldstsavings));
> > Log.d("GetDSTSavingsIssue", "TimeZone.getDSTSavings() == " +
> > String.valueOf(getdstsavings));
> > Log.d("GetDSTSavingsIssue", "GregorianCalendar DST_OFFSET ==
> > " +
> > String.valueOf(caldstsavings));
> > }
> > }
>
> > I tried running on 2.2 in emulator and on a device, and also on 3.2 in
> > emulator. Same result.
>
> > So, I wonder how this can be.
>
> > Regards
> > Jan
>
> > --
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>
> --
> Mark Murphy (a Commons
> Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy
>
> Android Training in DC:http://marakana.com/training/android/
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