Android活动完成更新以前的活动

Question

I have an activity where you can click on a product and it adds it to a basket, a button is then pressed to checkout where a new activity is started, this activity lists everything in the basket with an option to remove the item. If ALL items are removed I am calling finish() on this activity to go back to the previous activity that listed all the products.

The problem is that this previous activity still says X items have been selected, how can I get this to update or to reload?

Many Thanks.

Answer 1

You should put your refresh code inside the onResume method of your Activity .

Take a look at the Activity Lifecycle here for more information: http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle

Answer 2

Look at startActivityForResult and onActivityResult functions if you want to return information from child activity back to a parent activity.

onResume is called every time the task/app becomes active (for ex: screen off/on, switching to your app using task switcher etc) and you may not want to refresh the page in all these cases.