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# android.print

### Overview

Provides classes for implementing print support in applications and also contains all base classes and abstractions involved in printing. These base classes are also used by other more specialized printing related packages.

The entry point for interacting with the print system is the `PrintManager` which is a system service that can be obtained from the current context. The print manager provides APIs for printing, querying the state of print jobs, etc.

### Print contract

An application that wants to implement printing must extend `PrintDocumentAdapter` which defines the contract between the system and the application.The key idea behind this adapter is that the printed content may change based on the selected print options, such as media size, orientation, which requires the content to be re-laid out. The constraints according to which the content has to be laid out are encapsulated in the `PrintAttributes` class. Once layout is completed the application calls back to the system passing a `PrintDocumentInfo` instance which describes the generated content. After the content has been laid out the application may be asked to render some pages of that content for preview or printing. The range of pages that have to be rendered is abstracted by the `PageRange` class.

### Print jobs

A print job is represented by the `PrintJob` class which has behavior methods as well as methods for querying its state. Each print job has a unique id represented by the `PrintJobId` class and exposes APIs for obtaining a `PrintJobInfo` which is a snapshot of its state. The print job state may change over time.

### Printers

An available printer represented by the `PrinterInfo` class has a unique id which is abstracted by the `PrinterId` class. The `PrinterInfo` contains printer properties such as id, name, description, status, and printer capabilities encapsulated in the `PrinterCapabilitiesInfo` class. Printer capabilities describe how a printer can print content, for example what are the supported media sizes, color modes, resolutions, etc.

## Classes

PageRange | Represents a range of pages.
PrintAttributes | This class represents the attributes of a print job.
PrintAttributes.Builder | Builder for creating `PrintAttributes`.
PrintAttributes.Margins | This class specifies content margins.
PrintAttributes.MediaSize | This class specifies a supported media size.
PrintAttributes.Resolution | This class specifies a supported resolution in DPI (dots per inch).
PrintDocumentAdapter | Base class that provides the content of a document to be printed.
PrintDocumentAdapter.LayoutResultCallback | Base class for implementing a callback for the result of `PrintDocumentAdapter#onLayout(PrintAttributes, PrintAttributes, CancellationSignal, LayoutResultCallback, Bundle)`.
PrintDocumentAdapter.WriteResultCallback | Base class for implementing a callback for the result of `PrintDocumentAdapter#onWrite(PageRange[], ParcelFileDescriptor, CancellationSignal, WriteResultCallback)`.
PrintDocumentInfo | This class encapsulates information about a document for printing purposes.
PrintDocumentInfo.Builder | Builder for creating a `PrintDocumentInfo`.
PrinterCapabilitiesInfo | This class represents the capabilities of a printer.
PrinterCapabilitiesInfo.Builder | Builder for creating of a `PrinterCapabilitiesInfo`.
PrinterId | This class represents the unique id of a printer.
PrinterInfo | This class represents the description of a printer.
PrinterInfo.Builder | Builder for creating of a `PrinterInfo`.
PrintJob | This class represents a print job from the perspective of an application.
PrintJobId | This class represents the id of a print job.
PrintJobInfo | This class represents the description of a print job.
PrintJobInfo.Builder | Builder for creating a `PrintJobInfo`.
PrintManager | System level service for accessing the printing capabilities of the platform.

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