package com.example.myact3;

 import android.content.Intent;

 import android.os.Bundle;

 import android.support.v7.app.ActionBarActivity;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.TextView;

 /**

  * Android activity的回传数据

  * @author shaobn

  *

  */

 public class MainActivity extends ActionBarActivity {

     private Button button;

     private TextView tv;

     private static final  int REQUEST = 1;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         button = (Button)this.findViewById(R.id.button1);

         tv = (TextView) this.findViewById(R.id.textView1);

         button.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View arg0) {

                 // TODO Auto-generated method stub

                 Intent intent = new Intent(MainActivity.this,MainActivity2.class);

                 intent.putExtra("text", tv.getText());

                 //此方法发出请求携带自己的自已的请求码，方便回来时验证

                 startActivityForResult(intent,REQUEST);

             }

         });

     }

     //requestCode 请求码，目的是和发出请求的activity的请求码相一致

     //resultCode 响应码，目的是与本activity设置的响应码一致才接收数据。

     //data 第二个页面传递过来的intent对象

     @Override

     protected void onActivityResult(int requestCode, int resultCode, Intent data) {

         // TODO Auto-generated method stub

         super.onActivityResult(requestCode, resultCode, data);

         if(resultCode==2){

             if(requestCode==REQUEST){

                 String string = data.getStringExtra("response");

                 this.tv.setText(string);

             }

         }

     }

 }

 package com.example.myact3;

 import android.content.Intent;

 import android.os.Bundle;

 import android.support.v7.app.ActionBarActivity;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.TextView;

 public class MainActivity2 extends ActionBarActivity {

     private TextView tv;

     private Button button;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main_activity2);

         button = (Button) this.findViewById(R.id.button1);

         tv =  (TextView) this.findViewById(R.id.textView1);

         tv.setText("olympic games");

         button.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View arg0) {

                 // TODO Auto-generated method stub

                 Intent intent = new Intent();

                 intent.putExtra("response", tv.getText());

                 //回传给之前获得焦点的activity

                 setResult(2, intent);

                 //结束声明周期

                 finish();

             }

         });

     }

 }