How to make 3 spinners change their value when one of them is selected?

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Android

spinner

I made 3 spinners and what i want is when user selects spinner 1, spinner 2 and 3 change their value accordingly to spinner 1.

I have one little problem. I made, when spinner 1 value is changed spinner 2 is changing too, but my third spinner wont change value

CODE:

  Spinner grad,skola,zanimanje;

String gradovi[]={"Banja Luka","Bijeljina"};
String blskola[]={"JU Gimnazija","Zastiti Me","Skola 3"};
String blsmjer[]={"Opšti","MUZAFFARPUR","GAYA"};
String bijeljinaskole[]={"Skola 1","Skola 2","Skola 3"};
String bijeljinasmjer[]={"Smjer 1 Bijeljina","Smjer 2","Smjer 3"};



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pocetni);

    grad = (Spinner) findViewById(R.id.spinnergrad);
    skola = (Spinner) findViewById(R.id.spinnerskola);
    zanimanje = (Spinner) findViewById(R.id.spinnerzanimanje);

    final ArrayAdapter<String> gradovispinner = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, gradovi);

    final ArrayAdapter<String> banjalukaskola = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, blskola);

    final ArrayAdapter<String> banjalukasmjer = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, blsmjer);

    final ArrayAdapter<String> bijeljinas = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, bijeljinaskole);

    final ArrayAdapter<String> bijeljinasmj = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, bijeljinasmjer);


    gradovispinner.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    grad.setAdapter(gradovispinner);
    skola.setAdapter(banjalukaskola);



    grad.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

            switch (parent.getId()) {
                case R.id.spinnergrad: {
                    if (gradovi[position].equals("Banja Luka")) {


                        banjalukaskola.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        skola.setAdapter(banjalukaskola);

                        banjalukasmjer.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        zanimanje.setAdapter(banjalukasmjer);


                    }
                    else if(gradovi[position].equals("Bijeljina")){

                        bijeljinas.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        skola.setAdapter(bijeljinas);

                    }

                }

            }

        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });
}

What I have tried:

Everything is up there in code