public class DemoSignatureViewController extends SignatureViewActivity {
    private Date mDate;
    private Bitmap mSignatureBitmap;
    private byte[] mSignatureInBytes;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //set sub text
        this.setSubText("I accept the nothingness and meaninglessness of life");
    }
    //call back for done button click. returns bitmap
    @Override
    public void onClickDone(Bitmap bitmap) {
        mDate = this.getDate(); //get the date of the signature
        mSignatureBitmap = bitmap; // signature in bitmap
    }
    //call back for done button click. returns array of byte
    @Override
    public void onClickDone(byte[] bytes) {
        mSignatureInBytes = bytes; //signature in bytes
    }
    //callback for cancel button click
    @Override
    public void onClickCancel() {
    }
}