问android接口回调问题

EN

EditText et;
Button bt;
LinearLayout ll;
IntentIntegrator _scanner;

public SearchBar(Context c){
    et=new EditText(c);
    bt=new Button(c);
    //et.setHint("WayPoint");
    bt.setText("Scan");
    _scanner = new IntentIntegrator((Activity) c);

    ll=new LinearLayout(c);
    setLinearLayout();

    bt.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            _scanner.initiateScan();
        }
    });

    et.setLayoutParams(flowLeft());
    bt.setLayoutParams(flowRight());

    ll.addView(et);
    ll.addView(bt);
}
public LinearLayout getSearchBar(){
    return ll;
}

@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_search);

    //_scanner = new IntentIntegrator(this);

    //button_scan = (Button) findViewById(R.id.button_scan); 

    ScrollView sv = new ScrollView(this); 
    ll = new LinearLayout(this);        
    ll.setOrientation(LinearLayout.VERTICAL); 

    l2=new LinearLayout(this);      
    l2.setOrientation(LinearLayout.VERTICAL); 
    ll.addView(l2);

    //testing for searchBar class
    SearchBar origin= new SearchBar(this);
    origin.setHint("Origin");
    origin.setText("me");
    sbs.add(origin);
    ll.addView(sbs.get(0).getSearchBar());

    destin= new SearchBar(this);
    destin.setText("destin");
    destin.setHint("destination");
    destinLayout=destin.getSearchBar();
    sbs.add(destin);
    ll.addView(destinLayout);

    sv.addView(ll); 
    this.setContentView(sv);       

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if (requestCode == IntentIntegrator.REQUEST_CODE) { // from Barcode Scanner
        if (resultCode == RESULT_OK)
        {
            IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
            if (scanResult == null){
                //Alert.ShowAlert(this, "Scanning", "Scan Failed");
            }else {
                String scanned = scanResult.getContents();

                //How to get position of which button was fired

            }
        }
    }
}