startActivityForResult and onActivityResult

startActivityForResult and onActivityResult

startActivityForResult 开启Activity 组织数据之后 发送，onActivityResult 接受数据

  public class MyActivity extends Activity {
      ...

      static final int PICK_CONTACT_REQUEST = 0;

      protected boolean onKeyDown(int keyCode, KeyEvent event) {
          if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
              // When the user center presses, let them pick a contact.
              startActivityForResult(
                  new Intent(Intent.ACTION_PICK,
                  new Uri("content://contacts")),
                  PICK_CONTACT_REQUEST);
             return true;
          }
          return false;
      }

      protected void onActivityResult(int requestCode, int resultCode,
              Intent data) {
          if (requestCode == PICK_CONTACT_REQUEST) {
              if (resultCode == RESULT_OK) {
                  // A contact was picked.  Here we will just display it
                  // to the user.
                  startActivity(new Intent(Intent.ACTION_VIEW, data));
              }
          }
      }