package net.conw.intenttest;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements View.OnClickListener {

 private EditText editText;
 private Button button;
 public static int REQUEST_CODE = 1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  LinearLayout layout = new LinearLayout(this);
  editText = new EditText(this);
  button = new Button(this);
  button.setText("Main");
  button.setOnClickListener(this);

  layout.addView(editText);
  layout.addView(button);
  setContentView(layout);
 }

 @Override
 public void onClick(View v) {
  Intent intent = new Intent(this, OtherActivity.class);
  intent.putExtra("text", editText.getText().toString());
  startActivityForResult(intent, REQUEST_CODE);
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if(requestCode == REQUEST_CODE && resultCode == OtherActivity.RESULT_CODE) {
   editText.setText(data.getStringExtra("text"));
  }
 }
}

package net.conw.intenttest;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

public class OtherActivity extends Activity implements View.OnClickListener {

 private EditText editText;
 private Button button;
 public static int RESULT_CODE = 1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  LinearLayout layout = new LinearLayout(this);
  editText = new EditText(this);
  button = new Button(this);
  button.setText("Other");
  button.setOnClickListener(this);

  layout.addView(editText);
  layout.addView(button);
  setContentView(layout);

  editText.setText(getIntent().getStringExtra("text"));
 }

 @Override
 public void onClick(View v) {
  Intent intent = new Intent();
  intent.putExtra("text", editText.getText().toString());
  setResult(RESULT_CODE, intent);
  finish();
 }
}