Android startActivityForResult的使用

 

在Android中startActivityForResult主要作用就是:

A-Activity需要在B-Activtiy中执行一些数据操作，而B-Activity又要将，执行操作数据的结果返回给A-Activtiy

//看效果

//看代码

[java] view plaincopyprint?

1. package sn.len.actres; 
2.  
3. import android.app.Activity; 
4. import android.content.Intent; 
5. import android.os.Bundle; 
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 ActivityResultDemoActivityextends Activity 
12. { 
13.     private Button button_start_task; 
14.     private TextView TextView_result; 
15.     @Override 
16.     public void onCreate(Bundle savedInstanceState) 
17.     { 
18.         super.onCreate(savedInstanceState); 
19.         setContentView(R.layout.main); 
20.         button_start_task=(Button) findViewById(R.id.button_start_task); 
21.         TextView_result=(TextView) findViewById(R.id.TextView_result); 
22.         button_start_task.setOnClickListener(new button_start_task_Listener()); 
23.     } 
24.     private class button_start_task_Listenerimplements OnClickListener 
25.     { 
26.         public void onClick(View v) 
27.         { 
28.             Intent intent=new Intent(ActivityResultDemoActivity.this,SimpleTaskActivity.class); 
29.             //关键点来了，使用startActivityForResult来启动 
30.             startActivityForResult(intent, 100); 
31.         } 
32.     } 
33.     /**
34.      * 复写onActivityResult，这个方法
35.      * 是要等到SimpleTaskActivity点了提交过后才会执行的
36.      */ 
37.     @Override 
38.     protected void onActivityResult(int requestCode,int resultCode, Intent data) 
39.     { 
40.         //可以根据多个请求代码来作相应的操作 
41.         if(20==resultCode) 
42.         { 
43.             String bookname=data.getExtras().getString("bookname"); 
44.             String booksale=data.getExtras().getString("booksale"); 
45.             TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元"); 
46.         } 
47.         super.onActivityResult(requestCode, resultCode, data); 
48.     } 
49. } 

package sn.len.actres;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class ActivityResultDemoActivity extends Activity{private Button button_start_task;private TextView TextView_result;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);button_start_task=(Button) findViewById(R.id.button_start_task);TextView_result=(TextView) findViewById(R.id.TextView_result);button_start_task.setOnClickListener(new button_start_task_Listener());}private class button_start_task_Listener implements OnClickListener{public void onClick(View v){Intent intent=new Intent(ActivityResultDemoActivity.this,SimpleTaskActivity.class);//关键点来了，使用startActivityForResult来启动startActivityForResult(intent, 100);}}/** * 复写onActivityResult，这个方法 * 是要等到SimpleTaskActivity点了提交过后才会执行的 */@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data){//可以根据多个请求代码来作相应的操作if(20==resultCode){String bookname=data.getExtras().getString("bookname");String booksale=data.getExtras().getString("booksale");TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元");}super.onActivityResult(requestCode, resultCode, data);}}

//任务处理类

[java] view plaincopyprint?

1. package sn.len.actres; 
2.  
3. import android.app.Activity; 
4. import android.content.Intent; 
5. import android.os.Bundle; 
6. import android.view.View; 
7. import android.view.View.OnClickListener; 
8. import android.widget.Button; 
9. import android.widget.EditText; 
10.  
11. public class SimpleTaskActivityextends Activity 
12. { 
13.     private EditText EditText_bookname; 
14.     private EditText EditText_booksale; 
15.     private Button Button_task_fulfill; 
16.  
17.     @Override 
18.     protected void onCreate(Bundle savedInstanceState) 
19.     { 
20.         super.onCreate(savedInstanceState); 
21.         setContentView(R.layout.main2); 
22.          
23.         EditText_bookname=(EditText) findViewById(R.id.EditText_bookname); 
24.         EditText_booksale=(EditText) findViewById(R.id.EditText_booksale); 
25.         Button_task_fulfill=(Button) findViewById(R.id.Button_task_fulfill); 
26.         Button_task_fulfill.setOnClickListener(new Button_task_fulfill_Listener()); 
27.     } 
28.     private class Button_task_fulfill_Listenerimplements OnClickListener 
29.     { 
30.         public void onClick(View v) 
31.         { 
32.             String str_bookname=EditText_bookname.getText().toString(); 
33.             String str_booksale=EditText_booksale.getText().toString(); 
34.              
35.             //判断空，我就不判断了。。。。 
36.             Intent data=new Intent(); 
37.             data.putExtra("bookname", str_bookname); 
38.             data.putExtra("booksale", str_booksale); 
39.             //请求代码可以自己设置，这里设置成20 
40.             setResult(20, data); 
41.             //关闭掉这个Activity 
42.             finish(); 
43.         } 
44.     } 
45. }