Android activity的回传数据

 1 package com.example.myact3;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 import android.view.View.OnClickListener;
 8 import android.widget.Button;
 9 import android.widget.TextView;
10 /**
11  * Android activity的回传数据
12  * @author shaobn
13  *
14  */
15 public class MainActivity extends ActionBarActivity {
16     private Button button;    
17     private TextView tv;
18     private static final  int REQUEST = 1;
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_main);
23         button = (Button)this.findViewById(R.id.button1);
24         tv = (TextView) this.findViewById(R.id.textView1);
25         button.setOnClickListener(new OnClickListener() {
26             
27             @Override
28             public void onClick(View arg0) {
29                 // TODO Auto-generated method stub
30                 Intent intent = new Intent(MainActivity.this,MainActivity2.class);
31                 intent.putExtra("text", tv.getText());
32                 //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
33                 startActivityForResult(intent,REQUEST);
34             }
35         });
36     }
37     //requestCode 请求码，目的是和发出请求的activity的请求码相一致
38     //resultCode 响应码，目的是与本activity设置的响应码一致才接收数据。
39     //data 第二个页面传递过来的intent对象
40     @Override
41     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
42         // TODO Auto-generated method stub
43         super.onActivityResult(requestCode, resultCode, data);
44         if(resultCode==2){
45             if(requestCode==REQUEST){
46                 String string = data.getStringExtra("response");
47                 this.tv.setText(string);
48             }
49         }
50     }
51     
52 }

 1 package com.example.myact3;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 import android.view.View.OnClickListener;
 8 import android.widget.Button;
 9 import android.widget.TextView;
10 
11 public class MainActivity2 extends ActionBarActivity {
12     private TextView tv;
13     private Button button;
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         setContentView(R.layout.activity_main_activity2);
18         button = (Button) this.findViewById(R.id.button1);
19         tv =  (TextView) this.findViewById(R.id.textView1);
20         tv.setText("olympic games");
21         button.setOnClickListener(new OnClickListener() {
22             
23             @Override
24             public void onClick(View arg0) {
25                 // TODO Auto-generated method stub
26                 Intent intent = new Intent();
27                 intent.putExtra("response", tv.getText());
28                 //回传给之前获得焦点的activity
29                 setResult(2, intent);
30                 //结束声明周期
31                 finish();
32             }
33         });
34         
35     }
36 }

第二个页面的可以new Intent(),那默认使用的就是之前activit的请求码。

吾宁做一叶扁舟，始航于湖边，遨游于海上，浪迹于江中。