Android onActivityResult传值

public
 
class
 Wizard 
extends
 Activity {

    private
 TextView step1result, step2result, step3result;

    public
 
static
 
final
 String INTENT_STEP1 = 
"com.novoda.STEP1"
;
    public
 
static
 
final
 String INTENT_STEP2 = 
"com.novoda.STEP2"
;
    public
 
static
 
final
 String INTENT_STEP3 = 
"com.novoda.STEP3"
;

    private
 
static
 
final
 
int
 STEP1 = 
1
;
    private
 
static
 
final
 
int
 STEP2 = 
2
;
    private
 
static
 
final
 
int
 STEP3 = 
3
;

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

        this
.step1result = (TextView)findViewById(R.id.step1result);
        this
.step2result = (TextView)findViewById(R.id.step2result);
        this
.step3result = (TextView)findViewById(R.id.step3result);

        startActivityForResult(new
 Intent(Wizard.INTENT_STEP1), STEP1);
    }


    protected
 
void
 onActivityResult(
int
 requestCode, 
int
 resultCode, Intent data) {
        switch
 (requestCode) {
            case
 STEP1:
                this
.step1result.setText(data.getStringExtra(
"STEP1RESULT"
));
                startActivityForResult(new
 Intent(Wizard.INTENT_STEP2), STEP2);
                break
;
            case
 STEP2:
                this
.step2result.setText(data.getStringExtra(
"STEP2RESULT"
));
                startActivityForResult(new
 Intent(Wizard.INTENT_STEP3), STEP3);
                break
;
            case
 STEP3:
                this
.step3result.setText(data.getStringExtra(
"STEP3RESULT"
));
                break
;
        }
    }
}

public
 
class
 Step1 
extends
 Activity {

    @Override
    public
 
void
 onCreate(Bundle savedInstanceState) {
        super
.onCreate(savedInstanceState);
        setContentView(R.layout.step1);

        Button nextStep = (Button)findViewById(R.id.goto2);
        nextStep.setOnClickListener(new
 View.OnClickListener() {
            public
 
void
 onClick(View v) {
                Intent it = new
 Intent();
                it.putExtra("STEP1RESULT"
, ((EditText)findViewById(R.id.step1value)).getText()
                        .toString());
                setResult(Activity.RESULT_OK, it);
                finish();
            }
        });
    }
}