using bucky's tutorial 13-14, i am trying to create an interface in java but nothing is happening. the code is being taken without any mistakes but in the design view, no change is happening. when i did that with my main_activity, it worked fine, then as i had something else made in that activity, i created another activity, made it the launcher activity and tried the same thing in it, but it didnt work. there is no error in code but no changes are coming on screen./images/forum/upload/2015-10-24/c1bcf52af695cd12b3f02a7ed13d025f.jpg