Intent一般包含两个主要信息，action、data。
action：表示这个Intent此次操作的动作。
data：表示这次动作涉及的数据。

1、新建Android项目，增加新布局文件other.xml，新增Activity类otherActivity.class，用于接受Intent并展示other.xml。
2、在MainActivity类中，声明一个Intent类，通过Intent的构造函数指明源和目标。
3、获得Intent后，使用Intent.putExtra()方法对其传入数据。
4、调用Activity.startActivity启动这个Intent。
5、在otherActivity类中，使用Activity.getIntent()获得当前Activity的Intent。
6、获得Intent后，使用Intent.getXxxExtra()方法获得其中保存的数据。
7、在AndroidManifest.xml配置otherActivity节点。

步骤2--3：

1 public class MainActivity extends Activity {
 2     private TextView textView;
 3     private Button btn;
 4     @Override
 5     protected void onCreate(Bundle savedInstanceState) {
 6         super.onCreate(savedInstanceState);
 7         setContentView(R.layout.activity_main);
 8         
 9         textView=(TextView)findViewById(R.id.textView1);
10         btn=(Button)findViewById(R.id.button1);
11         btn.setOnClickListener(new View.OnClickListener() {            
12             @Override
13             public void onClick(View v) {
14                 // Intent构造函数：Intent来源；Intent目的。
15                 Intent intent =new Intent(MainActivity.this,otherActivity.class);
16                 intent.putExtra("data", "当前是页面2，信息来自页面1");
17                 startActivity(intent);//启动Activity
18　　　　　　　　　　finish();
18             }
19         });        
20     }
21 }

步骤4--5：

1 public class otherActivity extends Activity {
 2     private Button btn;
 3     private TextView textView;
 4     @Override
 5     protected void onCreate(Bundle savedInstanceState) {
 6         // TODO Auto-generated method stub
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.other);
 9         
10         textView=(TextView)findViewById(R.id.textView2);
11         btn=(Button)findViewById(R.id.button2);
12         
13         //通过Activity.getIntent()获取当前页面接收到的Intent。
14         Intent intent =getIntent();
15         //getXxxExtra方法获取Intent传递过来的数据
16         String msg=intent.getStringExtra("data");
17         textView.setText(msg);
18         
19         btn.setOnClickListener(new View.OnClickListener() {            
20             @Override
21             public void onClick(View v) {                
22                 Intent intent=new Intent(otherActivity.this,MainActivity.class);
23                 startActivity(intent);
24                 finish();
25             }
26         });        
27     }
28 }

步骤7：

1     <application
 2         android:allowBackup="true"
 3         android:icon="@drawable/ic_launcher"
 4         android:label="@string/app_name"
 5         android:theme="@style/AppTheme" >
 6         <activity
 7             android:name="cn.bgxt.IntentForAc.MainActivity"
 8             android:label="@string/app_name" >
 9             <intent-filter>
10                 <action android:name="android.intent.action.MAIN" />
11                 <category android:name="android.intent.category.LAUNCHER" />
12             </intent-filter>
13         </activity>
14         <activity android:name=".otherActivity"/>
15     </application>

MainActivity：

1 public class MainActivity extends Activity {
 2 
 3     private EditText one,two,result;
 4     private Button btn;
 5     
 6     @Override
 7     protected void onCreate(Bundle savedInstanceState) {
 8         super.onCreate(savedInstanceState);
 9         setContentView(R.layout.activity_main);
10         
11         one=(EditText)findViewById(R.id.one);
12         two=(EditText)findViewById(R.id.two);
13         result=(EditText)findViewById(R.id.result);
14         btn=(Button)findViewById(R.id.btnGo);
15         btn.setOnClickListener(new View.OnClickListener() {
16             
17             @Override
18             public void onClick(View v) {
19                 // TODO Auto-generated method stub
20                 int ione=Integer.parseInt(one.getText().toString());
21                 int itwo=Integer.parseInt(two.getText().toString());
22                 
23                 Intent intent=new Intent(MainActivity.this, otherActivity.class);
24                 intent.putExtra("one", ione);
25                 intent.putExtra("two", itwo);                
26                 
27                 //启动需要监听返回值的Activity，并设置请求码：requestCode
28                 startActivityForResult(intent, 1);
29             }
30         }); 
31         
32     }
33     
34     @Override
35     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
36         super.onActivityResult(requestCode, resultCode, data);
37         //当otherActivity中返回数据的时候，会响应此方法
38         //requestCode和resultCode必须与请求startActivityForResult()和返回setResult()的时候传入的值一致。
39         if(requestCode==1&&resultCode==2)
40         {
41             int three=data.getIntExtra("three", 0);
42             result.setText(String.valueOf(three));
43         }
44     }
45 
46     @Override
47     public boolean onCreateOptionsMenu(Menu menu) {
48         // Inflate the menu; this adds items to the action bar if it is present.
49         getMenuInflater().inflate(R.menu.main, menu);
50         return true;
51     }
52 }

otherActivity:

1 public class otherActivity extends Activity {
 2     TextView tvShow;
 3     EditText etResult;
 4     @Override
 5     protected void onCreate(Bundle savedInstanceState) {
 6         super.onCreate(savedInstanceState);
 7         setContentView(R.layout.other);
 8         
 9         tvShow=(TextView)findViewById(R.id.tvShow);
10         etResult=(EditText)findViewById(R.id.etResult);
11         
12         Intent intent=getIntent();
13         int a=intent.getIntExtra("one", 0);
14         int b=intent.getIntExtra("two", 0);
15         tvShow.setText(a+" + "+b+" = "+" ? ");        
16         
17         Button btnResult=(Button)findViewById(R.id.btnReturn);
18         btnResult.setOnClickListener(new View.OnClickListener() {            
19             @Override
20             public void onClick(View v) {
21                 //新声明一个Intent用于存放放回的数据
22                 Intent i=new Intent();
23                 int result=Integer.parseInt(etResult.getText().toString());
24                 i.putExtra("three", result);
25                 setResult(2, i);//设置resultCode，onActivityResult()中能获取到
26                 finish();//使用完成后结束当前Activity的生命周期
27             }
28         });                
29     }
30 }