startActivityForResult and onActivityResult

startActivityForResult and onActivityResult

startActivityForResult  Activity    ，onActivityResult  

 1  public class MyActivity extends Activity {

 2      ...

 3 

 4      static final int PICK_CONTACT_REQUEST = 0;

 5 

 6      protected boolean onKeyDown(int keyCode, KeyEvent event) {

 7          if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {

 8              // When the user center presses, let them pick a contact.

 9              startActivityForResult(

10                  new Intent(Intent.ACTION_PICK,

11                  new Uri("content://contacts")),

12                  PICK_CONTACT_REQUEST);

13             return true;

14          }

15          return false;

16      }

17 

18      protected void onActivityResult(int requestCode, int resultCode,

19              Intent data) {

20          if (requestCode == PICK_CONTACT_REQUEST) {

21              if (resultCode == RESULT_OK) {

22                  // A contact was picked.  Here we will just display it

23                  // to the user.

24                  startActivity(new Intent(Intent.ACTION_VIEW, data));

25              }

26          }

27      }