1 public class menu extends Activity {
 2 
 3     @Override
 4     public void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6 
 7         setContentView(R.layout.menu);
 8 
 9         ...
10 
11         // Button2
12         Button Btn2 = (Button) findViewById(R.id.button2);
13 
14         Btn2.setOnClickListener(new OnClickListener() {
15 
16             @Override
17             public void onClick(View arg0) {
18 
19                 Intent intent = new Intent(menu.this, detail.class);
20                 intent.putExtra("flg", "list");
21                 startActivity(intent);
22             }
23         });
24 
25         ...
26         
27 
28     }

1             Bundle bundle = this.getIntent().getExtras();
2             String flg = bundle.getString("flg");
3             if (flg.equals("list")) {
4                             ...
5             }

1         Bundle bundle = new Bundle();
2 
3         bundle.putString("Name", "Jacker");
4         bundle.putString("Phone", "13590010101");
5         bundle.putBoolean("flg", true);
6 
7         intent.putExtras(bundle);

1              Bundle bundle = this.getIntent().getExtras();
2 
3              String name = bundle.getString("Name");
4              String phone = bundle.getString("Phone");
5              boolean flg = bundle.getBoolean("flg");