the timer variable should be a member of the class not a variable within 
the body. That way you can check and cancel... Something like this will be 
closer to what you need:

UITimer timer;

protected boolean filter(String text) {
    if (text.length() == 0) {
        if(timer != null) timer.cancel();
        return false;

    // other logic that doesn't involve server...
    if(timer != null) timer.cancel();
    timer = new UITimer(() -> {
       all your server fetch code should be here!

    timer.schedule(1000, true, fmArticulo);

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