spinnerFrom = (Spinner) findViewById(R.id.spinnerDropdown);
spinnerTo = (Spinner) findViewById(R.id.spinnerDropdown2);

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.velocity_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);

        spinnerFrom.setAdapter(adapter);
        spinnerTo.setAdapter(adapter);
        spinnerFrom.setOnItemSelectedListener(this);
        spinnerTo.setOnItemSelectedListener(this);

@Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
        if(parent.getId() == R.id.spinnerDropdown)
        {
            spinner1 = Integer.parseInt(parent.getItemAtPosition(position).toString());
        }
        else if(parent.getId() == R.id.spinnerDropdown2)
        {
            spinner2 = Integer.parseInt(parent.getItemAtPosition(position).toString());
        }
}

@Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
        spinnerFrom.setSelection(position);
        spinnerTo.setSelection(position);

        String values = "Spinner 1: " + spinnerFrom.getSelectedItem().toString() +
                "nSpinner 2: " + spinnerTo.getSelectedItem().toString();

        resultDisplay.setText(values);
}