Intent use (2)

The meaning of the way of establishing intent is mentioned here, and the function of intent is recorded here, and the value transfer between activity

     startActivityForResult(Intent, int) 。 其中intent是想要做的事情，int 是request_code; intent中的功能执行结束时，需要返回一个

     然后再在该类中重载  onActivityResult(int, int, Intent) 函数来处理返回结果。

Below is the official activity document:

Http://www.android-doc.com/reference/android/app/Activity.html

startActivityForResult(Intent, int)onActivityResult(int, int, Intent)Method.

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 is 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 is picked. Here we'll just display it
to the user.
StartActivity (New Intent (Intent.action_view, data));
}
}
}
}

Intent use (2)