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Notes on video lecture:
Fields of the Intent Class
Notes taken by Edward Tanguay on June 25, 2014 (go to class or lectures)
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the intent class is basically a data structure
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it serves two purposes in Android:
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1. specifies an operation
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2. represent an event that has occurred in the system that you want to notify other components about
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intents are a kind of language for specifying operations that you want to have performed
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give you an easy way to say:
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"I want to select a contact"
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"I want to take a photo"
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"I want to dial a phone number"
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"I want to display a map"
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intents are usually constructed by one activity that wants some work to be done, and Android uses that intent to start another activity that can perform the desired work
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intent fields
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action
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names the operation to be performed
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e.g.
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ACTION_DIAL
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dials a number
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ACTION_EDIT
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allows user to edit some piece of data
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ACTION_SYNC
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synchronizess device data on device with data on a server
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ACTION_MAIN
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start an activity as an initial activity of an application
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you can pass an intent action to the constructor
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Intent in = new Intent(Intent.ACTION_DIAL)
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you can also call the setAction() method
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data
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data associated with the intent
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formatted as a URI
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data to view on a map, e.g. Uri.parse("geo:0,0?q=452+Smith+St.+Denver+CO")
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phone number to call, e.g. Uri.parse("tel:+1555555555")
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Uri.parse returns a URI object
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you can set it in the construtor or use setData()
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category
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additional information about the kinds of components that can or should handle this intent
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examples
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CATEGORY_BROWSABLE
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invoked by browser
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CATEGORY_LAUNCHER
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can be the initial activity of a task
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type
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the mime type of intent data
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IMAGE/PNG, IMAGE/JPG
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TEXT/PLAIN, TEXT/HTML
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if unspecified, it will try to infer it
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can use setDataAndType()
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component
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identifies the intent's target activity
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if one activity should always receive this intent
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extras
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additional information associated with the intent
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map of key/value pairs
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needs to know the type
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e.g. Intent.EXTRA_EMAIL
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flags
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represent information on how intent should be handles
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e.g.
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FLAG_ACTIVITY_NO_HISTORY
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don't put this activity in the history stack
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FLAG_DEBUG_LOG_RESOLUTION
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print extra logging information when this intent is processed
Android Architecture
The Android Development Environment
Developing an Android App
The Activity Class
Fields of the Intent Class
Android Permissions
The Fragment Class