Initially, your application might be starting only Activities defined within its own package. However, with the appropriate permissions, applications might also launch external Activities within other applications. For example, a Customer Relationship Management (CRM) application might launch the Contacts application to browse the Contact database, choose a specific contact, and return that Contact's unique identifier to the CRM application for use.
Here is an example of how to create a simple Intent with a predefined Action (action_dial) to launch the Phone Dialer with a specific phone number to dial in the form of a simple Uri object:
Uri number = Uri.parse(tel:5555551212);
Intent dial = new Intent(Intent.ACTION_DIAL, number);
You can find a list of commonly used Google application Intents at http://developer.an-droid.com/guide/appendix/g-app-intents.html. Also available is the developer managed Registry of Intents protocols at OpenIntents, found at http://www.openintents.org/en/ intentstable, which has a growing list of Intents available from third-party applications and those within the Android SDK.
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