spMain = (Spinner) findViewById(R.id.spMain);
        	ArrayAdapter adapter = ArrayAdapter.createFromResource( this, R.array.mainSpinnerValues , android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        	spMain.setAdapter(adapter);

public void OnItemSelected (AdapterView<?> parent, View view, int pos, long id) 
    {
				
			
	      
    }
	
	public void onNothingSelected(AdapterView parent) 
    {
      // Do nothing.
    }

<?xml version="1.0" encoding="utf-8"?>
<resources>
    
    <string-array name = "mainSpinnerValues">
    	
    	<item>Crypt</item>
    	<item>Settings</item>
    	
    </string-array>	
    
</resources>

<Spinner
        android:id="@+id/spMain"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:prompt="@string/chooseView" />

Intent intent = new Intent(MainActivity.this, CryptActivity.class);
				startActivity(intent);

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
        // your code here
    }

    @Override
    public void onNothingSelected(AdapterView<?> parentView) {
        // your code here
    }

});