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  • Android中 requestCode与resultCode的区别与用法

     requestCode:

               用于判断传过来的数据来自于哪个activity

    resultCode：

               当一个Activity有多种数据传过来时，resultCode就可以用来判断传过来的数据的类型

    下面用一个例子说明吧，首先看结果

    说明：

       三个按钮两个编辑框

      点击单选联系人与单选回复有两个activity,分别选联系人与回复，这样就可以利用 requestCode来判断数据来自于那个activity

      点击同时选，会出现两列数据，一列联系人，一列回复。选好联系人会跳转到上一个activity，把联系人填好，然后再点击按钮选好回复，自动跳转到上一个activity填好回复。（并不能算真正的同时选，只是为了理解resultCode的用法，来判断传过来的是联系人还是回复）

    下面上代码吧：

    # SimperActivity.java(MainActivity.java)

     1 package com.example.lynn.adapter.Intent;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.Button;
 8 import android.widget.EditText;
 9 
10 import com.example.lynn.adapter.R;
11 
12 public class SimperActivity extends Activity {
13 
14     final int NAME = 1;
15     final int SMS = 2;
16     //三个Activity的请求码
17     final int NAME_ACTIVITY = 0;
18     final int SMS_ACTIVITY = 3;
19     final int SELECT_ACTIVITY = 4;
20     private Button select;
21     private Button selectName;
22     private Button selectSms;
23     EditText nameText;
24     EditText smsText;
25 
26     @Override
27     protected void onCreate(Bundle savedInstanceState) {
28         super.onCreate(savedInstanceState);
29         setContentView(R.layout.simper_layout);
30         select = (Button) findViewById(R.id.select);
31         selectName = (Button) findViewById(R.id.singer_name);
32         selectSms = (Button) findViewById(R.id.singer_sms);
33         nameText = (EditText) findViewById(R.id.name);
34         smsText = (EditText) findViewById(R.id.sms);
35         select.setOnClickListener(new View.OnClickListener() {
36             @Override
37             public void onClick(View v) {
38                 Intent intent = new Intent(SimperActivity.this, SelectActivity.class);
39                 startActivityForResult(intent, SELECT_ACTIVITY);
40             }
41         });
42     }
43 
44 
45     @Override
46     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
47         super.onActivityResult(requestCode, resultCode, data);
48         String n, s;
49         switch (requestCode) {
50             case (NAME_ACTIVITY):
51                 n = data.getStringExtra("name");
52                 nameText.setText(n);
53                 break;
54             case (SMS_ACTIVITY):
55                 s = data.getStringExtra("sms");
56                 smsText.setText(s);
57                 break;
58             case (SELECT_ACTIVITY): {
59                 if (resultCode == NAME) {
60                     n = data.getStringExtra("name");
61                     nameText.setText(n);
62                 } else if (resultCode == SMS) {
63                     s = data.getStringExtra("sms");
64                     smsText.setText(s);
65                 }
66             }
67             break;
68         }
69 
70     }
71 
72     //单选联系人的点击事件
73     public void toSelectName(View v) {
74         Intent intent = new Intent(SimperActivity.this, SelectPersonActivity.class);
75         startActivityForResult(intent, NAME_ACTIVITY);
76 
77     }
78 
79     //单选回复的点击事件
80     public void toSelectSms(View v) {
81         Intent intent = new Intent(SimperActivity.this, SelectSmsActivity.class);
82         startActivityForResult(intent, SMS_ACTIVITY);
83 
84     }
85 }
    View Code

    simper_layout.xml

     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical" android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5     <TableLayout
 6         android:layout_width="match_parent"
 7         android:layout_height="wrap_content"
 8         >
 9     <TableRow>
10     <TextView
11         android:layout_width="0dp"
12         android:layout_height="wrap_content"
13         android:layout_weight="1"
14         android:text="@string/name"
15         />
16     <EditText
17         android:id="@+id/name"
18         android:labelFor="@id/name"
19         android:inputType="text"
20         android:layout_width="0dp"
21         android:layout_height="wrap_content"
22         android:layout_weight="5"
23         />
24 </TableRow>
25         <TableRow>
26             <TextView
27                 android:layout_width="0dp"
28                 android:layout_height="wrap_content"
29                 android:layout_weight="1"
30                 android:text="@string/sms"
31                 />
32             <EditText
33                 android:id="@+id/sms"
34                 android:labelFor="@id/sms"
35                 android:inputType="text"
36                 android:layout_width="0dp"
37                 android:layout_height="wrap_content"
38                 android:layout_weight="5"
39                 />
40         </TableRow>
41     </TableLayout>
42 
43 
44     <Button
45     android:id="@+id/select"
46     android:layout_width="wrap_content"
47     android:layout_height="wrap_content"
48     android:text="同时选好"
49     />
50     <Button
51         android:id="@+id/singer_name"
52         android:layout_width="wrap_content"
53         android:layout_height="wrap_content"
54         android:text="单选联系人"
55         android:onClick="toSelectName"
56         />
57     <Button
58         android:id="@+id/singer_sms"
59         android:layout_width="wrap_content"
60         android:layout_height="wrap_content"
61         android:text="单选回复"
62         android:onClick="toSelectSms"
63         />
64 </LinearLayout>
    View Code

    SelectActivity.java(同时选)

     1 package com.example.lynn.adapter.Intent;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.AdapterView;
 8 import android.widget.ArrayAdapter;
 9 import android.widget.ListView;
10 import android.widget.Toast;
11 
12 import com.example.lynn.adapter.R;
13 
14 import java.util.ArrayList;
15 import java.util.List;
16 
17 
18 public class SelectActivity extends Activity  {
19     private List<String> nameList;
20     private List<String> smsList;
21 
22     private ListView nameView;
23     private ListView smsView;
24 
25     @Override
26     protected void onCreate(Bundle savedInstanceState) {
27         super.onCreate(savedInstanceState);
28         setContentView(R.layout.select_layout);
29         nameView= (ListView) findViewById(R.id.allpersons);
30         smsView= (ListView) findViewById(R.id.allsms);
31         addContent();
32         nameView.setAdapter(new ArrayAdapter<String>(this,
33                 android.R.layout.simple_list_item_1,nameList));
34         smsView.setAdapter(new ArrayAdapter<String>(this,
35                 android.R.layout.simple_list_item_1,smsList));
36         nameView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
37             @Override
38             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
39                 Intent data=new Intent();
40                 data.putExtra("name", nameList.get(position));
41                 setResult(1,data);
42                 Toast.makeText(SelectActivity.this, "您选择了"+nameList.get(position)+" !", Toast.LENGTH_LONG).show();
43                 finish();
44 
45 
46             }
47         });
48         smsView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
49             @Override
50             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
51                 Intent data=new Intent();
52                 data.putExtra("sms", smsList.get(position));
53                 setResult(2,data);
54                 finish();
55             }
56         });
57     }
58 
59     //添加数据
60     public void addContent(){
61         nameList=new ArrayList<>();
62         nameList.add("lynn");
63         nameList.add("jack");
64         nameList.add("cat");
65 
66         smsList=new ArrayList<>();
67         smsList.add("waiting...");
68         smsList.add("I am busy...");
69         smsList.add("hey,man....");
70 
71     }
72 
73 
74 }
    View Code

    select_layout.xml

     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="horizontal">
 6 
 7     <LinearLayout
 8         android:layout_width="0dp"
 9         android:layout_height="wrap_content"
10         android:layout_weight="1"
11         android:orientation="vertical">
12 
13         <TextView
14             android:layout_width="wrap_content"
15             android:layout_height="wrap_content"
16             android:text="联系人；"
17             android:textSize="24dp" />
18 
19         <ListView
20             android:id="@+id/allpersons"
21             android:layout_width="wrap_content"
22             android:layout_height="wrap_content" />
23     </LinearLayout>
24 
25     <LinearLayout
26         android:layout_width="0dp"
27         android:layout_height="wrap_content"
28         android:layout_weight="1"
29         android:orientation="vertical">
30 
31         <TextView
32             android:layout_width="wrap_content"
33             android:layout_height="wrap_content"
34             android:text="回复："
35             android:textSize="24dp" />
36 
37         <ListView
38             android:id="@+id/allsms"
39             android:layout_width="wrap_content"
40             android:layout_height="wrap_content"
41 
42             />
43     </LinearLayout>
44 </LinearLayout>
    View Code

    SelectSmsActivity.java(单选回复)

     1 package com.example.lynn.adapter.Intent;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.AdapterView;
 8 import android.widget.ArrayAdapter;
 9 import android.widget.ListView;
10 
11 import com.example.lynn.adapter.R;
12 
13 /**
14  * Created by Administrator on 2016/5/29.
15  */
16 public class SelectSmsActivity extends Activity {
17 
18     private String[] allsms={"I am busy....","waiting....","hey,man.."};
19     private ListView smsView;
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.allsms_layout);
24         smsView= (ListView) findViewById(R.id.the_sms);
25         smsView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,allsms));
26         smsView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
27             @Override
28             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
29                 Intent data=new Intent();
30                 data.putExtra("sms",allsms[position]);
31                 setResult(3,data);
32                 finish();
33             }
34         });
35 
36     }
37 }
    View Code

    SelectPersonActivity.java(单选联系人)

     1 package com.example.lynn.adapter.Intent;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.AdapterView;
 8 import android.widget.ArrayAdapter;
 9 import android.widget.ListView;
10 
11 import com.example.lynn.adapter.R;
12 
13 import java.util.List;
14 
15 
16 public class SelectPersonActivity extends Activity{
17 
18     private String[] allNames=new String[]{"lynn","jack","cat"};
19     private ListView nameView;
20 
21     @Override
22     protected void onCreate(Bundle savedInstanceState) {
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.allnames_layout);
25         nameView= (ListView) findViewById(R.id.the_name);
26         nameView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,allNames));
27         nameView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
28             @Override
29             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
30                 Intent data=new Intent();
31                 data.putExtra("name",allNames[position]);
32                 setResult(0,data);
33                 finish();
34             }
35         });
36     }
37 }
    View Code

    说明：以上的两个Activity的布局文件都是只有一个listView，故此处不再给出，有不对的地方多多指教！
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  • 原文地址：https://www.cnblogs.com/Lynn0814/p/5543334.html
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