move cursor in editText with buttons android studio

Question

i'm developing an application for android studio. I added buttons to move the cursor left and right, how can I also move it up and down between the lines? This is what I have already done:

EditText editText; ImageButton buttonBackward, buttonForward; RelativeLayout arrows;

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

    editText = findViewById(R.id.editText);
    buttonBackward = findViewById(R.id.buttonBackward);
    buttonForward = findViewById(R.id.buttonForward);
    arrows = findViewById(R.id.arrows);
    editText.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            arrows.setVisibility(View.VISIBLE);
        }
    });
    buttonForward.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (editText.getSelectionEnd() < editText.getText().toString().length()) {
                editText.setSelection(editText.getSelectionEnd() + 1);
            } else {
                //fine stringa, non posso muovere il cursore
            }
        }
    });
    buttonBackward.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (editText.getSelectionStart() > 0) {
                editText.setSelection(editText.getSelectionEnd() - 1);
            } else {
                //start of string, cannot move cursor backward
            }
        }
    });
}