docs: Removed obsolete links to Android N Preview Reference. am: 2dbf44ab am: 173b5605

        <li><a href="#vr">VR Support</a></li>

        <li><a href="#vr">VR Support</a></li>

        <li><a href="#print_svc">Print Service Enhancements</a></li>

        <li><a href="#print_svc">Print Service Enhancements</a></li>

        <li><a href="#virtual_files">Virtual Files</a></li>

        <li><a href="#virtual_files">Virtual Files</a></li>

        <li><a href="#framemetrics_api">FrameMetricsListener API</a></li>

        <li><a href="#framemetrics_api">Frame Metrics API</a></li>

      </ol>

      </ol>

</div>

</div>

</div>

</div>

</p>

</p>

<p>

<p>

  For information about creating an app tile, see the documentation for

  For information about creating an app tile, see the reference documentation

  <code>android.service.quicksettings.Tile</code> in the downloadable <a href=

  for {@link android.service.quicksettings.Tile Tile}.

  "{@docRoot}preview/setup-sdk.html#docs-dl">API Reference</a>.

</p>

</p>

through any medium, such as a VOIP endpoint or forwarding phones.</p>

through any medium, such as a VOIP endpoint or forwarding phones.</p>

<p>

<p>

  For more information, see <code>android.provider.BlockedNumberContract</code>

  For more information, see the reference documentation for

  in the downloadable <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API

  {@link android.provider.BlockedNumberContract BlockedNumberContract}.

  Reference</a>.

</p>

</p>

<h2 id="call_screening">Call Screening</h2>

<h2 id="call_screening">Call Screening</h2>

</ul>

</ul>

<p>

<p>

  For more information, see <code>android.telecom.CallScreeningService</code>

  For more information, see the reference documentation for

  in the downloadable <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API

  {@link android.telecom.CallScreeningService CallScreeningService}.

  Reference</a>.

</p>

</p>

features such as face-tracking, eye-tracking, point scanning, and so on, to

features such as face-tracking, eye-tracking, point scanning, and so on, to

meet the needs of those users.</p>

meet the needs of those users.</p>

<p>For more information, see <code>android.accessibilityservice.GestureDescription</code>

<p>For more information, see the reference documentation for

  in the downloadable <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API Reference</a>.</p>

{@link android.accessibilityservice.GestureDescription GestureDescription}.

</p>

<h2 id="direct_boot">Direct Boot</h2>

<h2 id="direct_boot">Direct Boot</h2>

  from the system and from the app in focus. The system retrieves these

  from the system and from the app in focus. The system retrieves these

  shortcuts automatically from the app’s menu if the shortcuts exist. You can

  shortcuts automatically from the app’s menu if the shortcuts exist. You can

  also provide your own fine-tuned shortcuts lists for the screen. You can do

  also provide your own fine-tuned shortcuts lists for the screen. You can do

  this by overriding the new <code>Activity.onProvideKeyboardShortcuts()</code>

  this by overriding the {@link android.view.Window.Callback#onProvideKeyboardShortcuts

  method, described in the downloadable <a href=

  onProvideKeyboardShortcuts()} method.

  "{@docRoot}preview/setup-sdk.html#docs-dl">API Reference</a>.

</p>

</p>

<p class="note">

<p class="note">

<p>

<p>

  To trigger Keyboard Shortcuts Helper from anywhere in your app, call

  To trigger Keyboard Shortcuts Helper from anywhere in your app, call

  {@code Activity.requestKeyboardShortcutsHelper()} for the relevant activity.

  {@link android.app.Activity#requestShowKeyboardShortcuts requestShowKeyboardShortcuts()}

  from the relevant activity.

</p>

</p>

<h2 id="custom_pointer_api">

<h2 id="custom_pointer_api">

<ul>

<ul>

  <li>You can set an icon from a resource ID by calling

  <li>You can set an icon from a resource ID by calling

  <code>PrinterInfo.Builder.setResourceIconId()</code>

  {@link android.print.PrinterInfo.Builder#setIconResourceId setIconResourceId()}.

  </li>

  </li>

  <li>You can show an icon from the network by calling

  <li>You can show an icon from the network by calling

  <code>PrinterInfo.Builder.setHasCustomPrinterIcon()</code>, and setting a

  {@link android.print.PrinterInfo.Builder#setHasCustomPrinterIcon setHasCustomPrinterIcon()},

  callback for when the icon is requested using

  and setting a callback for when the icon is requested using

  <code>android.printservice.PrinterDiscoverySession.onRequestCustomPrinterIcon()</code>

  {@link android.printservice.PrinterDiscoverySession#onRequestCustomPrinterIcon onRequestCustomPrinterIcon()}.

  </li>

  </li>

</ul>

</ul>

<p>

<p>

  In addition, you can provide a per-printer activity to display additional

  In addition, you can provide a per-printer activity to display additional

  information by calling <code>PrinterInfo.Builder.setInfoIntent()</code>.

  information by calling {@link android.print.PrinterInfo.Builder#setInfoIntent setInfoIntent()}.

</p>

</p>

<p>

<p>

  You can indicate the progress and status of print jobs in the print job

  You can indicate the progress and status of print jobs in the print job

  notification by calling

  notification by calling

  <code>android.printservice.PrintJob.setProgress()</code> and

  {@link android.printservice.PrintJob#setProgress setProgress()} and

  <code>android.printservice.PrintJob.setStatus()</code>, respectively.

  {@link android.printservice.PrintJob#setStatus setStatus()}, respectively.

</p>

<p>

  For more information about these methods, see the downloadable <a href=

  "{@docRoot}preview/setup-sdk.html#docs-dl">API Reference</a>.

</p>

</p>

<h2 id="framemetrics_api">FrameMetricsListener API</h2>

<h2 id="framemetrics_api">Frame Metrics API</h2>

<p>

<p>

The FrameMetricsListener API allows an app to monitor its UI rendering

The Frame Metrics API allows an app to monitor its UI rendering

performance. The API provides this capability by exposing a streaming Pub/Sub API to transfer frame

performance. The API provides this capability by exposing a streaming Pub/Sub API to transfer frame

timing info for the app's current window. The data returned is

timing info for the app's current window. The data returned is

equivalent to that which <code><a href="{@docRoot}tools/help/shell.html#shellcommands">adb shell</a>

equivalent to that which <code><a href="{@docRoot}tools/help/shell.html#shellcommands">adb shell</a>

</p>

</p>

<p>

<p>

You can use FrameMetricsListener to measure interaction-level UI

You can use the Frame Metrics API to measure interaction-level UI

performance in production, without a USB connection. This API

performance in production, without a USB connection. This API

allows collection of data at a much higher granularity than does

allows collection of data at a much higher granularity than does

{@code adb shell dumpsys gfxinfo}. This higher granularity is possible because

{@code adb shell dumpsys gfxinfo}. This higher granularity is possible because

</p>

</p>

<p>

<p>

To monitor a window, implement the <code>FrameMetricsListener.onMetricsAvailable()</code>

To monitor a window, implement the

callback method and register it on that window. For more information, refer to

{@link android.view.Window.OnFrameMetricsAvailableListener#onFrameMetricsAvailable OnFrameMetricsAvailableListener.onFrameMetricsAvailable()}

the {@code FrameMetricsListener} class documentation in

callback method and register it on that window.

the downloadable <a href="{@docRoot}preview/setup-sdk.html#docs-dl">API Reference</a>.

</p>

</p>

<p>

<p>

The API provides a {@code FrameMetrics} object, which contains timing data that

The API provides a {@link android.view.FrameMetrics FrameMetrics} object, which

the rendering subsystem reports for various milestones in a frame lifecycle.

contains timing data that the rendering subsystem reports for various milestones

The supported metrics are: {@code UNKNOWN_DELAY_DURATION},

in a frame lifecycle. The supported metrics are: {@code UNKNOWN_DELAY_DURATION},

{@code INPUT_HANDLING_DURATION}, {@code ANIMATION_DURATION},

{@code INPUT_HANDLING_DURATION}, {@code ANIMATION_DURATION},

{@code LAYOUT_MEASURE_DURATION}, {@code DRAW_DURATION}, {@code SYNC_DURATION},

{@code LAYOUT_MEASURE_DURATION}, {@code DRAW_DURATION}, {@code SYNC_DURATION},

{@code COMMAND_ISSUE_DURATION}, {@code SWAP_BUFFERS_DURATION},

{@code COMMAND_ISSUE_DURATION}, {@code SWAP_BUFFERS_DURATION},