Android - Refresh/restart a previous activity

When a user return开发者_如何转开发s from an activity to the main menu of my program, what class do you use to for example; refresh/restart the main menu (update it)?

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It depends... if you started the second activity and want to update the first, you should:

• Use startActivityForResult method to start the second activity
• Place the "refresh code" in the onActivityResult method of your first activity.

If that's not the scenario, you can try to place the refresh code in onResume.