@Override
  public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);

		addListenerOnButton();
	addListenerOnSpinnerItemSelection();
  }

// add items into spinner dynamically
 public void addListenerOnSpinnerItemSelection() {
	spinner1 = (Spinner) findViewById(R.id.spinner1);
	spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
  }

// get the selected dropdown list value
  public void addListenerOnButton() {

	spinner1 = (Spinner) findViewById(R.id.spinner1);
	btnSubmit = (Button) findViewById(R.id.btnSubmit);

	btnSubmit.setOnClickListener(new OnClickListener() {
@Override
	  public void onClick(View v) {

	    Toast.makeText(MyAndroidAppActivity.this,
		"OnClickListener : " +
                "\nSpinner 1 : "+ String.valueOf(spinner1.getSelectedItem())
			Toast.LENGTH_SHORT).show();
	  }

	});



Changer le toast pour les actions a la DB
et en plus, un exemple de toast pour toi :)