安卓开发_startActivityForResult的详细用法

 1 package other;
 2 
 3 import com.example.allcode.R;
 4 
 5 import android.app.Activity;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 import android.widget.TextView;
12 
13 public class Use_startActivityForResult_frist extends Activity implements OnClickListener{
14     private TextView text_frist;
15     private TextView text_second;
16     private Button btn_frist;
17     private Button btn_second;
18     int requestCode = 0;
19     Intent intent;
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         // TODO Auto-generated method stub
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.other_frist_activity);
25         text_frist = (TextView) findViewById(R.id.id_frist_text);
26         text_second = (TextView) findViewById(R.id.id_second_text);
27         btn_frist = (Button) findViewById(R.id.btn_frist);
28         btn_second = (Button) findViewById(R.id.btn_second);
29         btn_frist.setOnClickListener(this);
30         btn_second.setOnClickListener(this);
31         
32 
33      intent = new Intent();
34     intent.setClass(Use_startActivityForResult_frist.this,Use_startActivityForResult_second.class);
35 
36     }
37     @Override
38     public void onClick(View v) {
39         // TODO Auto-generated method stub
40         switch (v.getId()) {
41         case R.id.btn_frist:
42             // 请求码的值随便设置，但必须>=0
43             requestCode = 0;
44             startActivityForResult(intent, requestCode);
45             break;
46         case R.id.btn_second:
47             requestCode = 2;
48             startActivityForResult(intent, requestCode);
49             break;
50         default:
51             break;
52         }
53         
54     }
55 
56 
57     // 回调方法，从第二个页面回来的时候会执行这个方法
58     @Override
59     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
60         String change01 = data.getStringExtra("change01");       //获取change01 对应的数据
61         String change02 = data.getStringExtra("change02");       //获取change02 对应的数据
62         // 根据上面发送过去的请求吗来区别
63         switch (requestCode) {
64         case 0:
65             text_frist.setText(change01);    //根据请求码执行相应的操作
66             break;
67         case 2:
68             text_second.setText(change02);
69             break;
70         default:
71             break;
72         }
73         
74     }
75 
76 
77 }

 1 package other;
 2 
 3 import com.example.allcode.R;
 4 
 5 import android.app.Activity;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 
 9 public class Use_startActivityForResult_second extends Activity{
10     int resultCode = 0;
11         @Override
12         protected void onCreate(Bundle savedInstanceState) {
13             // TODO Auto-generated method stub
14             super.onCreate(savedInstanceState);
15             setContentView(R.layout.other_second_activity);
16             
17             Intent intent = new Intent();
18             intent.putExtra("change01", "第一行值已经改变，现在为：1000");  //给change01参数一个值1000 
19             intent.putExtra("change02", "第二行值已经改变，现在为：2000");  //给change02参数一个值2000    注意这个值，即第二个参数必须是字符串类型的
20             // 设置结果，并进行传送
21             this.setResult(resultCode, intent);
22             this.finish();
23         }
24 
25 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7 <TextView  
 8     android:id="@+id/id_frist_text"
 9     android:layout_width="fill_parent" 
10     android:layout_height="wrap_content" 
11     android:text="第一行文本信息"
12     />
13 <TextView  
14     android:id="@+id/id_second_text"
15     android:layout_width="fill_parent" 
16     android:layout_height="wrap_content" 
17     android:text="第二行文本信息"
18     />
19 <Button 
20     android:id="@+id/btn_frist"
21     android:layout_width="fill_parent" 
22     android:layout_height="wrap_content"
23     android:text="改变第一行文本的值"
24     />
25 <Button 
26     android:id="@+id/btn_second"
27     android:layout_width="fill_parent" 
28     android:layout_height="wrap_content"
29     android:text="改变第二行文本的值"
30     />
31 </LinearLayout>