playing sound after it reaches the whole duration of sound in mediaplayer android eclipse

i am new in android programming. What I am trying to do is to play the sound after it reaches the whole duration of the first inputted sounds but it seems like the sounds are stopping when my sounds should play up to 4 seconds.

my concept is:

if sound reaches to 1 second

mp.start

else if sound reaches to 2 seconds

mp.start

else if sound reaches to 3 seconds

mp.start

else if sound reaches to 4 seconds

mp.start

is there any code on how to do this?

because what i did is like this but it's not working

 int x = mp.getDuration();
        if(x >= 1000){
            mp.start(); 
        }else if(x >= 2000){
            mp.start(); 
        }
        else if(x >= 3000){
            mp.start(); 
        }
        else if(x >= 4000){
            mp.start(); 
        }