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<h3>Overview</h3>
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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.
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<p>
The entry point for interacting with the print system is the {@link android.print.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.
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<h3>Print contract</h3>
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An application that wants to implement printing must extend
{@link android.print.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 {@link android.print.PrintAttributes} class. Once
layout is completed the application calls back to the system passing a
{@link android.print.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
{@link android.print.PageRange} class.
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<h3>Print jobs</h3>
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A print job is represented by the {@link android.print.PrintJob} class which has behavior
methods as well as methods for querying its state. Each print job has a unique id represented
by the {@link android.print.PrintJobId} class and exposes APIs for obtaining a {@link
android.print.PrintJobInfo} which is a snapshot of its state. The print job state may
change over time.
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<h3>Printers</h3>
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An available printer represented by the {@link android.print.PrinterInfo} class has a
unique id which is abstracted by the {@link android.print.PrinterId} class. The {@link
android.print.PrinterInfo} contains printer properties such as id, name, description, status,
and printer capabilities encapsulated in the {@link android.print.PrinterCapabilitiesInfo}
class. Printer capabilities describe how a printer can print content, for example what are
the supported media sizes, color modes, resolutions, etc.
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