How to get TimeZone from android mobile?

Have you tried to use TimeZone.getDefault():

Most applications will use TimeZone.getDefault() which returns a TimeZone based on the time zone where the program is running.

Ref: http://developer.android.com/reference/java/util/TimeZone.html

TimeZone tz = TimeZone.getDefault();
System.out.println("TimeZone   "+tz.getDisplayName(false, TimeZone.SHORT)+" Timezone id :: " +tz.getID());

Output:

TimeZone GMT+09:30 Timezone id :: Australia/Darwin

Edit: corrected the case

TimeZone.getDefault()

I needed the offset that not only included day light savings time but as a numerial. Here is the code that I used in case someone is looking for an example.

I get a response of "3.5" (3:30') which is what I would expect in Tehran , Iran in winter and "4.5" (4:30') for summer .

I also needed it as a string so I could post it to a server so you may not need the last line.

for getting currect time zone :

TimeZone tz = TimeZone.getDefault();
Date now = new Date();
//Import part : x.0 for double number
double offsetFromUtc = tz.getOffset(now.getTime()) / 3600000.0;
String m2tTimeZoneIs = Double.parseDouble(offsetFromUtc);