In Android applications, we use the intent mechanism to jump between activities.

This example simply introduces how to use intent to make the program jump from MainActivity to another OtherActivity to realize a single parameter value. When returning MainActivity, use Bundle for batch return.

1, Design interface

1. MainActivity layout file

Open the RES / layout / activity main.xml file.
Enter the following code:

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout   
3.     xmlns:android="http://schemas.android.com/apk/res/android"  
4.     android:layout_width="match_parent"  
5.     android:layout_height="match_parent"  
6.     android:orientation="vertical" >  
7.   
8.     <Button  
9.         android:id="@+id/open"  
10.         android:layout_width="wrap_content"  
11.         android:layout_height="wrap_content"  
12.         android:text="Open another Activity(OtherActivity)" />  
13.   
14.     <TextView  
15.         android:id="@+id/result"  
16.         android:layout_width="wrap_content"  
17.         android:layout_height="wrap_content"  
18.         android:text="display OtherActivity Return results" />  
19.   
20. </LinearLayout>  

2. OtherActivity layout file

Open the res/layout/otheractivity.xml file.
Enter the following code:

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="vertical" >  
6.   
7.     <Button  
8.         android:id="@+id/back"  
9.         android:layout_width="wrap_content"  
10.         android:layout_height="wrap_content"  
11.         android:text="Return MainActivity" />  
12.       
13.     <TextView  
14.         android:id="@+id/prompt"  
15.         android:layout_width="wrap_content"  
16.         android:layout_height="wrap_content"  
17.         android:text="display MainActivity Pass value" />  
18.   
19. </LinearLayout>  

2, Procedure documents

1. Open the "Src / com. Genwoxue. Intent? B / mainactivity. Java" file.
Then enter the following code:

1. package com.genwoxue.intent_b;  
2.   
3. import android.os.Bundle;  
4. import android.app.Activity;  
5. import android.content.Intent;  
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 MainActivity extends Activity {  
12.   
13.     private TextView tvResult=null;  
14.     private Button btnOpen=null;  
15.     @Override  
16.      public void onCreate(Bundle savedInstanceState)     
17.     {     
18.         super.onCreate(savedInstanceState);                
19.         setContentView(R.layout.activity_main);  
20.           
21.         tvResult=(TextView)super.findViewById(R.id.result);  
22.           
23.         btnOpen=(Button)super.findViewById(R.id.open);  
24.           
25.         //Call OtherActivity and pass value  
26.         btnOpen.setOnClickListener(new OnClickListener(){  
27.             public void onClick(View v)  
28.             {    
29.                 Intent intent=new Intent(MainActivity.this,OtherActivity.class);  
30.                 intent.putExtra("prompt", "Do you know Chiang's phone number and email address?");  
31.                 MainActivity.this.startActivityForResult(intent, 1);  
32.             }  
33.         });  
34.     }  
35.       
36.     //Processing received data  
37.     @Override  
38.     protected void onActivityResult(int requestCode,int resultCode,Intent data){  
39.         switch(resultCode){  
40.             case RESULT_OK:  
41.                 super.onActivityResult(requestCode, resultCode, data);  
42.                 //Receive data: use Bundle to transmit value  
43.                 Bundle bundle =data.getExtras();    
44.                 String employeeName=bundle.getString("employeeName");    
45.                 String mobile=bundle.getString("mobile");    
46.                 String email=bundle.getString("email");    
47.                 tvResult.setText("☆☆☆☆☆☆Return results☆☆☆☆☆☆"+"\n Employees:"+employeeName+"\n phone number:"+mobile+"\n E-mail:"+email);  
48.                 break;  
49.             case RESULT_CANCELED:  
50.                 tvResult.setText("Action cancel");  
51.                 break;  
52.             default:  
53.                 break;  
54.         }  
55.     }  
56. }             
57.       

2. Open the "Src / com. Genwoxue. ContentProvider? B / otheractivity. Java" file.
Then enter the following code:

1. package com.genwoxue.intent_b;  
2.   
3. import android.os.Bundle;  
4. import android.app.Activity;  
5. import android.content.Intent;  
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 OtherActivity extends Activity {  
12.   
13.     private TextView tvPrompt=null;  
14.     private Button btnBack=null;  
15.     @Override  
16.      public void onCreate(Bundle savedInstanceState)     
17.     {     
18.         super.onCreate(savedInstanceState);                
19.         setContentView(R.layout.activity_other);             
20.         tvPrompt=(TextView)super.findViewById(R.id.prompt);  
21.         btnBack=(Button)super.findViewById(R.id.back);  
22.           
23.         //receive data   
24.         Intent intent=super.getIntent();  
25.         String url=intent.getStringExtra("prompt");  
26.         tvPrompt.setText(url);  
27.           
28.         //Return to MainActivity  
29.         btnBack.setOnClickListener(new OnClickListener(){  
30.             public void onClick(View v)  
31.             {    
32.                 Bundle bundle = new Bundle();    
33.                 bundle.putString("employeeName", "Jiang Laofu");    
34.                 bundle.putString("mobile", "139037100xx");    
35.                 bundle.putString("email", "hello@genwoxue.com");  
36.                   
37.                 Intent intent = new Intent(OtherActivity.this,MainActivity.class);    
38.                 intent.putExtras(bundle);    
39.                 OtherActivity.this.setResult(RESULT_OK, intent);    
40.                 OtherActivity.this.finish();    
41.             }  
42.         });  
43.     }  
44. }             

3, Profile

Open the "Android manifest. XML" file.
Then enter the following code:

1. <?xml version="1.0" encoding="utf-8"?>  
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"  
3.     package="com.genwoxue.intent_b"  
4.     android:versionCode="1"  
5.     android:versionName="1.0" >  
6.   
7.     <uses-sdk  
8.         android:minSdkVersion="8"  
9.         android:targetSdkVersion="15" />  
10.   
11.     <application  
12.         android:allowBackup="true"  
13.         android:icon="@drawable/ic_launcher"  
14.         android:label="@string/app_name"  
15.         android:theme="@style/AppTheme" >  
16.         <activity  
17.             android:name="com.genwoxue.intent_b.MainActivity"  
18.             android:label="@string/app_name" >  
19.             <intent-filter>  
20.                 <action android:name="android.intent.action.MAIN" />  
21.                 <category android:name="android.intent.category.LAUNCHER" />  
22.             </intent-filter>  
23.         </activity>  
24.           
25.         <span style="color:#ff0000;"><strong><activity  
26.             android:name="com.genwoxue.intent_b.OtherActivity">  
27.         </activity>  
28. </strong></span>    </application>  
29.   
30. </manifest>  

4, Operation results