ModPE countdown

var ctx = com.mojang.minecraftpe.MainActivity.currentMainActivity.get();
var seconds = 3;

function countdown() {
    ctx.runOnUiThread(new java.lang.Runnable({
        run: function() {
            new android.os.Handler()
                .postDelayed(new java.lang.Runnable({
                    run: function() {
                        if(seconds > 0) {
                            clientMessage(seconds + "...");
                            seconds--;
                            eval(countdown());
                        } if(seconds == 0) {
                            clientMessage(seconds + "...");
                            afterCountdownHook();
                        }
                    }
                }), 1000);
        }
    }))
};

//call countdown() whenever you want to start the countdown

function afterCountdownHook() {
    //this hook will run when the countdown ends
    //add your own code here
}