Просто попробуйте этот код ....
final CharSequence[] gender = {"Male","Female"};
AlertDialog.Builder alert = new AlertDialog.Builder(uploadphoto.this);
alert.setTitle("Select Gender");
alert.setSingleChoiceItems(gender,-1, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
if(gender[which]=="Male")
{
gen="1";
}
else if (gender[which]=="Female")
{
gen="2";
}
}
});
alert.show();