4.3.6. Intents for Launching Other Activities
Android uses a technique known as intent messaging to communicate information between activities within one app or activities in separate apps. Each Activity can specify intent filters indicating actions the Activity is capable of handling. Intent filters are defined in the AndroidManifest.xml file. In fact, in each app so far, the IDE created an intent filter for the app’s only Activity indicating that it could respond to the predefined action named android.intent.action.MAIN, which specifies that the Activity can be used to launch the app to begin its execution.
An Intent is used to launch an Activity—it indicates an action to be performed and the data on which to perform that action. In this app, ...
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