By Karim Yaghmour
Embedded Android is for builders eager to create embedded structures in response to Android and for these desirous to port Android to new undefined, or making a customized improvement atmosphere. Hackers and moders also will locate this an indispensible consultant to how Android works.
NOTE: Very most likely retail, yet i've got no approach of understanding this with PDF.
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Extra info for Embedded Android: Porting, Extending, and Customizing
Sample text
Usually, app developers don't need to deal with wakelocks directly, because the abstractions they use automatically take care of the required locking. They can, nonetheless, communicate with the Power Manager Service if they require explicit wakelocks. Driver developers, on the other hand, can call on the added in-kernel wakelock primitives to grab and release wakelocks. The downside of using wakelocks in a driver, however, is that 30 | Chapter 2: Internals Primer it becomes impossible to push that driver into the mainline kernel, because the mainline doesn't include wakelock support.
Data Storage Android presents developers with several storage options. For simple storage needs, Android provides shared preferences, which allows developers to store keypair values either in a data-set shared by all components of the app or within a specific separate file. Developers can also manipulate files directly. These files may be stored privately by the app, and therefore inaccessible to other apps, or made readable and/or writeable by other apps. App developers can also use the SQLite functionality included in Android to manage their own private database.
The "main" buffer is the one whose events are shown by the logcat command when it's issued without any parameters. Both the Log and EventLog classes are exposed through the app development API, while Slog is for internal AOSP use only. Despite being available to app developers, though, EventLog is clearly identified in the documentation aas mainly or system integrators, not app developers. In fact, the vast majority of code samples and examples provided as part of the developer documentation use the Log class.