AndroidのIntent戻り値

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		one=(EditText) this.findViewById(R.id.one);
		two=(EditText) this.findViewById(R.id.two);
		result=(EditText) this.findViewById(R.id.result);
		button=(Button)this.findViewById(R.id.button);
		
		button.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String a=one.getText().toString();
				String b=two.getText().toString();
				Intent intent=new Intent(MainActivity.this,OtherActivity.class);
				intent.putExtra("a", a);
				intent.putExtra("b", b);
				startActivityForResult(intent, 1);}});}
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	
		super.onActivityResult(requestCode, resultCode, data);
		Log.i("Main", "requestCode:"+requestCode+"resultCode:"+resultCode);
		if(resultCode==2){
			if(requestCode==1){
				result.setText(data.getStringExtra("tree"));}	}	
	}
}

もう一つのactivity

	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.other);
		textView = (TextView) this.findViewById(R.id.msg);
		editText = (EditText) this.findViewById(R.id.three);
		button = (Button) this.findViewById(R.id.button2);

		Intent intent = getIntent();

		String a = intent.getStringExtra("a");
		String b = intent.getStringExtra("b");
		textView.setText(a + " + " + b + " =?");

		button.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View arg0) {
				Intent intent=new Intent();
			String tree=editText.getText().toString();
			   intent.putExtra("tree",tree);
			   setResult(2, intent);
			   finish();

			}
		});

	}

}