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이 화면에서 더하기를 눌렀을떄 밑에잇는 화면처럼뜬후 돌아기버튼을 누르면 Toast 로 더한값을 보여주고싶은데요

뭘 잘못햇는지 Toast가 안뜨네요... 해결방법 부탁드립니다.


이 액티비티 코드는


public class MainActivity extends Activity {

Button btnGo;

EditText ed1,ed2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btnGo=(Button)findViewById(R.id.btnGo);

ed1=(EditText)findViewById(R.id.ed1);

ed2=(EditText)findViewById(R.id.ed2);


btnGo.setOnClickListener(new View.OnClickListener() {


@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent = new Intent(getApplicationContext(),SecondActivity.class);

intent.putExtra("Num1", Integer.parseInt(ed1.getText().toString()));

intent.putExtra("Num2", Integer.parseInt(ed2.getText().toString()));

startActivity(intent);


}

});


}




이 액티비티코드는 



public class SecondActivity extends Activity {

Button btnBack;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.second);

btnBack=(Button)findViewById(R.id.btnBack);

Intent inIntent = getIntent();

final int hapValue = inIntent.getIntExtra("Num1", 0)

+ inIntent.getIntExtra("Num2", 0);



btnBack.setOnClickListener(new View.OnClickListener() {


@Override

public void onClick(View v) {

// TODO Auto-generated method stub


Intent outIntent = new Intent(getApplicationContext(),MainActivity.class);

outIntent.putExtra("Hap", hapValue);

setResult(RESULT_OK,outIntent);

finish();


}

});

}


입니다 혼자 독학하는데 막히는 부분이 많네요 ...