The Fragment is added by an Activity (which acts as the host of the Fragment). Within the Fragment lifecycle callback methods, you can declare how your Fragment behaves when it is in a certain state, such as active, paused, or stopped. Using a Fragment lifecycle is a lot like using an Activity lifecycle (see The Activity Lifecycle for details). This chapter describes the mechanisms for passing data and how to manage the Fragment lifecycle within an Activity. Understanding the relationship between Activity and Fragment lifecycles helps you design fragments that can save and restore variables and communicate with activities.Īn Activity that hosts a Fragment can send information to that Fragment, and receive information from that Fragment. Like an Activity, a Fragment has its own lifecycle. Communicating between a Fragment and an Activity.Using Fragment methods and the Activity context.Unit 6: Working with Architecture Components An Intent that carries the result data.1.2: Fragment lifecycle and communicationsĤ.3: Best practices: network, battery, compression.This is either RESULT_OK if the operation was successful or RESULT_CANCELED if the user backed out or the operation failed for some A result code specified by the second activity.The request code you passed to startActivityForResult().When the user is done with the subsequent activity and returns, the system calls your activity's StartActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST) tType(Phone.CONTENT_TYPE) // Show user only contacts w/ phone numbers Intent pickContactIntent = new Intent(Intent.ACTION_PICK, new Uri("content://contacts")) Static final int PICK_CONTACT_REQUEST = 1 // The request code Result Intent, the callback provides the same request code so that yourĪpp can properly identify the result and determine how to handle it.įor example, here's how to start an activity that allows the user to pick a contact: The integer argument is a "request code" that identifies your request. There's nothing special about the Intent object you use when startingĪn activity for a result, but you do need to pass an additional integer argument to the startActivityForResult() method. Your own activities to receive a result, you should use an explicit intent to ensure that you Note: You can use explicit or implicit intents when you call Sends the result as another Intent object. Of course, the activity that responds must be designed to return a result. Might start the People app in order for the user to select aĬontact and you'll receive the contact details as a result. To receive a result, call startActivityForResult() (instead of startActivity()).įor example, your app can start a camera app and receive the captured photo as a result. Starting another activity doesn't have to be one-way.
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