Http Post With Body

i have sent method in objective-c of sending http post and in the body i put a string:

NSString *requestBody = [NSString stringWithFormat:@"mystring"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[requestBody dataUsingEncoding:NSUTF8StringEncoding]];

now in Android i want to do the same thing and i am looking for a way to set the body of http post.