Intents (android.content.Intent) are the messaging system by which one activity is able to launch another activity. An activity can, for example, issue an intent to request the launch of another activity contained within the same application. Intents also, however, go beyond this concept by allowing an activity to request the services of any other appropriately registered activity on the device for which permissions are configured. Consider, for example, an activity contained within an application that requires a web page to be loaded and displayed to the user. Rather than the application having to contain a second activity to perform this task, the code can simply send an intent to the Android runtime requesting the services of any activity that has registered the ability to display a web page. The runtime system will match the request to available activities on the device and either launch the activity that matches or, in the event of multiple matches...
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