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Docs: Complications additions and changes am: 5c7636218d

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Change-Id: I20035c0a8c18681663f960fdf69cdd64b5672814
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Bert McMeen
2016-09-28 22:28:03 +00:00
committed by android-build-merger
parent 5493c32287 e1473e1124
commit 8dcef53c20
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docs/html/wear/preview/features/complications.jd
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@@ -12,6 +12,13 @@ page.image=/wear/preview/images/complications-main-image.png
<a href="#adding_complications_to_a_watch_face">Adding <a href="#adding_complications_to_a_watch_face">Adding
Complications to a Watch Face</a> Complications to a Watch Face</a>
</li> </li>
<li>
<a href="#permissions-for-complication-data">Permissions
for Complication Data</a>
</li>
<li>
<a href="#default-providers">Default Providers for Watch Faces</a>
</li>
<li> <li>
<a href="#exposing_data_to_complications">Exposing Data to <a href="#exposing_data_to_complications">Exposing Data to
Complications</a> Complications</a>
@@ -27,12 +34,14 @@ page.image=/wear/preview/images/complications-main-image.png
<a href="#api_additions">API Additions</a> <a href="#api_additions">API Additions</a>
</li> </li>
</ol> </ol>
<h2>See Also</h2> <h2>See Also</h2>
<ol> <ol>
<li><a class="external-link" <li><a class="external-link"
href="https://github.com/googlesamples/android-WatchFace">Watch href="https://github.com/googlesamples/android-WatchFace">Watch
Face sample app with complications</a></li> Face sample app with complications</a></li>
</ol> </ol>
</div> </div>
</div> </div>
@@ -56,9 +65,12 @@ page.image=/wear/preview/images/complications-main-image.png
</p> </p>
<p> <p>
Along with reviewing this page, download the Android Wear 2.0 Preview You can review the Javadoc for complications by downloading
Reference (see the Complications API <a href= the Android Wear 2.0 Preview
"#api_additions">additions</a>) and review the Javadoc for complications. Reference. Also see the <a href="#api_additions">API additions for
complications</a> and the
<a href="https://developer.android.com/wear/preview/behavior-changes.html">
behavior changes</a> for Wear 2.0.
</p> </p>
<p> <p>
@@ -117,8 +129,8 @@ page.image=/wear/preview/images/complications-main-image.png
<code>WatchFaceService.Engine</code> class, with a list of watch face <code>WatchFaceService.Engine</code> class, with a list of watch face
complication IDs. A watch face creates these IDs to uniquely identify complication IDs. A watch face creates these IDs to uniquely identify
slots on the watch face where complications can appear, and passes them slots on the watch face where complications can appear, and passes them
to the <code>createProviderChooserIntent</code> method (of the to the <code>createProviderChooserIntent</code> method
<code>ProviderChooserIntent</code> class) to allow the user to decide to allow the user to decide
which complication should go in which slot. which complication should go in which slot.
</p> </p>
@@ -186,6 +198,406 @@ page.image=/wear/preview/images/complications-main-image.png
where possible. where possible.
</p> </p>
<h2 id="permissions-for-complication-data">
Permissions for Complication Data
</h2>
<p>
A watch face must have the following <a href=
"https://developer.android.com/training/permissions/requesting.html">permission</a>
to receive complication data and open the provider chooser:
</p>
<pre>
com.google.android.wearable.permission.RECEIVE_COMPLICATION_DATA
</pre>
<h3 id="opening-the-provider-chooser">
Opening the provider chooser
</h3>
<p>
A watch face that was not granted the above permission will be unable to
start the provider chooser.
</p>
<p>
To make it easier to request the permission and start the chooser, the
<code>ComplicationHelperActivity</code> class is available in the
wearable support library. This class should be used instead of
<code>ProviderChooserIntent</code> to start the chooser in almost all
cases.
</p>
<h4 id="requesting-the-necessary-permission">
Requesting the necessary permission
</h4>
<p>
To use <code>ComplicationHelperActivity</code>, add it to the watch face
in the <a href=
"https://developer.android.com/guide/topics/manifest/manifest-intro.html">
manifest file</a>:
</p>
<pre>
&lt;activity android:name=&quot;android.support.wearable.complications.ComplicationHelperActivity&quot;/&gt;
</pre>
<p>
To start the provider chooser, call the
<code>ComplicationHelperActivity.createProviderChooserHelperIntent</code>
method, to obtain an intent.
</p>
<p>
The new intent can be used with either <code>startActivity</code> or
<code>startActivityForResult</code> to launch the chooser.
</p>
<p>
Here is an example of using the new intent with
<code>startActivityForResult</code>:
</p>
<pre>
startActivityForResult(
ComplicationHelperActivity.createProviderChooserHelperIntent(
getActivity(),
watchFace,
complicationId,
ComplicationData.TYPE_LARGE_IMAGE),
PROVIDER_CHOOSER_REQUEST_CODE);
</pre>
<p>
When the helper activity is started, the helper activity checks if the
permission was granted. If the permission was not granted, the helper
activity makes a runtime permission request. If the permission request is
accepted (or is unneeded), the provider chooser is shown.
</p>
<p>
If <code>startActivityForResult</code> was used with the intent, the
result delivered back to the calling Activity will have a result code of
<code>RESULT_OK</code> if a provider was successfully set, or a result
code of <code>RESULT_CANCELLED</code> if no provider was set.
</p>
<p>
In the case where a provider was set,
<code>ComplicationProviderInfo</code> for the chosen provider will be
included in the data intent of the result, as an extra with the key
<code>ProviderChooserIntent#EXTRA_PROVIDER_INFO</code>.
</p>
<h3 id="receiving-complication-data">
Receiving complication data
</h3>
<p>
In general, watch faces need the above permission in order to receive
complication data, but there are some exceptions. Specifically, a watch
face can only receive data from a provider if one of the following is
true:
</p>
<ul>
<li>The provider is a "safe" system provider,
</li>
<li>The provider and watch face are from the same app,
</li>
<li>The provider whitelists the watch face as a "safe" watch face, or
</li>
<li>The watch face has the permission
</li>
</ul>
<h4 id="lack-of-appropriate-permission">
Lack of appropriate permission
</h4>
<p>
If none of the above is true, then when <code>ComplicationData</code>
normally would be sent by a provider to a watch face, the system instead
sends data of the type <code>TYPE_NO_PERMISSION</code>. This type
includes an icon (an exclamation mark) and short text ("--") to allow it
to be rendered as if it were of the short text type or icon type, for
convenience.
</p>
<p>
When a watch face receives data of <code>TYPE_NO_PERMISSION</code>, the
watch face should render this appropriately, so the user can see that
action is needed for the complication to work. If possible, a tap on a
complication in this state should launch a permission request. This can
be done using
<code>ComplicationHelperActivity.createPermissionRequestHelperIntent</code>,
if the helper activity was added to the watch face app.
</p>
<p>
If a user accepts the permission request created by the helper activity,
updates are requested for all the active complications on the watch face
automatically, allowing the <code>TYPE_NO_PERMISSION</code> data to be
replaced by real data.
</p>
<h4 id="safe-providers">
Safe providers
</h4>
<p>
Some system providers are considered "safe", because they only supply
information that the watch face already could obtain itself.
</p>
<p>
These providers are listed in the new <code>SystemProviders</code> class
in the wearable support library. Whether a system provider is safe is
stated in the Javadoc (in the Android Wear 2.0 Preview Reference). Also
see <a href="#system-providers">System providers</a> for a list.
</p>
<h4 id="provider-specified-safe-watch-faces">
Provider-specified safe watch faces
</h4>
<p>
Providers can specify certain watch faces as "safe" to receive their
data. This is intended to be used only when the watch face will attempt
to use the provider as a default (see below),
and the provider trusts the watch face app.
</p>
<p>
To declare watch faces as safe, the provider adds metadata with a key of
<code>android.support.wearable.complications.SAFE_WATCH_FACES</code>. The
metadata value should be a comma-separated list (whitespace is ignored).
Entries in the list can be component names (of
<code>WatchFaceServices</code>, given as if
<code>ComponentName.flattenToString()</code> had been called), or they
can be package names (of apps, in which case every watch face within a
specified app is considered safe).
</p>
<p>
For example:
</p>
<pre>
&lt;meta-data
android:name=&quot;android.support.wearable.complications.SAFE_WATCH_FACES&quot;
android:value=&quot;
com.app.watchface/com.app.watchface.MyWatchFaceService,
com.anotherapp.anotherwatchface/com.something.WatchFaceService,
com.something.text
&quot;/&gt;
</pre>
<h2 id="default-providers">
Default Providers for Watch Faces
</h2>
<p>
Watch faces can specify default providers that are used until a user
selects a provider.
</p>
<h3 id="setting-default-providers">
Setting default providers
</h3>
<p>
Set default providers using the
<code>setDefaultComplicationProvider</code> method in
<code>WatchFaceService.Engine</code>. This method may be called at any
time, but it does nothing if the user already chose a provider for the
given complication.
</p>
<h3 id="safe-providers2">
Safe providers
</h3>
<p>
For most providers, the <code>RECEIVE_COMPLICATION_DATA</code> permission
must be granted to a watch face before data can flow to it. However, some
system providers are considered "safe", and do not require the watch face
to have the permission for data to be sent (see <a href=
"#safe-providers">Safe Providers</a> and <a href=
"#system-providers">System providers</a>). These providers may be
preferable to use as defaults, as they can supply data immediately.
</p>
<p>
Alternatively, if a watch face has a partnership with a certain provider
and wishes to use it as a default, it can request that the provider list
it as a safe watch face (see <a href=
"#provider-specified-safe-watch-faces">Provider-specified safe watch
faces</a>).
</p>
<h3 id="system-providers">
System providers
</h3>
<p>
The system includes providers that can be used as defaults. These are
listed in the <code>SystemProviders</code> class in the wearable support
library.
</p>
<p>
The following table has details about providers that are considered safe:
</p>
<table>
<tr>
<th>
Method name in the SystemProviders class
</th>
<th>
Safety
</th>
<th>
Can be the default
</th>
<th>
Notes
</th>
</tr>
<tr>
<td>
<code>dateProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
The standard system date provider. Tapping opens the standard Agenda
app.
</td>
</tr>
<tr>
<td>
<code>currentTimeProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
The standard system "time and date" provider. No tap action.
</td>
</tr>
<tr>
<td>
<code>batteryProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
The standard system battery provider. No tap action.
</td>
</tr>
<tr>
<td>
<code>stepCountProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
Shows a daily total of steps, as reported by
<code>readDailyTotal</code>.
</td>
</tr>
<tr>
<td>
<code>unreadCountProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
Shows the number of unread notifications in the stream.
</td>
</tr>
<tr>
<td>
<code>worldClockProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
Will default to London or New York. Can be tapped to change the time
zone.
</td>
</tr>
<tr>
<td>
<code>appsProvider()</code>
</td>
<td>
Yes
</td>
<td>
Yes
</td>
<td>
Will show an "apps" icon at first, which can be tapped to choose an
app.
</td>
</tr>
<tr>
<td>
<code>nextEventProvider()</code>
</td>
<td>
No
</td>
<td>
Yes (but not a safe provider)
</td>
<td>
The standard system "next event" provider. Tapping opens
the standard Agenda app.
</p>
</td>
</tr>
</table>
<h2 id="exposing_data_to_complications"> <h2 id="exposing_data_to_complications">
Exposing Data to Complications Exposing Data to Complications
</h2> </h2>
@@ -203,6 +615,11 @@ page.image=/wear/preview/images/complications-main-image.png
be used to send data back to the system. be used to send data back to the system.
</p> </p>
<p class="note"><strong>Note:</strong> When you provide data as a
complication data provider, the watch face receives the raw values
you send so it can draw them on the watch face.
</p>
<p> <p>
In your app's manifest, declare the service and add an intent filter for In your app's manifest, declare the service and add an intent filter for
the following: the following:
@@ -210,7 +627,8 @@ page.image=/wear/preview/images/complications-main-image.png
<pre> <pre>
android.support.wearable.complications.ACTION_COMPLICATION_UPDATE_REQUEST android.support.wearable.complications.ACTION_COMPLICATION_UPDATE_REQUEST
</pre> </pre>
<p> <p>
The service's manifest entry should also include an The service's manifest entry should also include an
<code>android:icon</code> attribute. The provided icon should be a <code>android:icon</code> attribute. The provided icon should be a
@@ -227,6 +645,21 @@ android.support.wearable.complications.ACTION_COMPLICATION_UPDATE_REQUEST
<a href="#api_additions">API Additions</a>). <a href="#api_additions">API Additions</a>).
</p> </p>
<p>
Additionally, a permission for provider services ensures that only the Android Wear system
can bind to provider services. Only the Android Wear system can have this
permission.
</p>
<p>
Provider services should add the following to their service declarations
in the manifest:
</p>
<pre>
android:permission="com.google.android.wearable.permission.BIND_COMPLICATION_PROVIDER"
</pre>
<h3 id="update_period"> <h3 id="update_period">
Update period Update period
</h3> </h3>
@@ -371,6 +804,11 @@ METADATA_KEY_PROVIDER_CONFIG_ACTION
<p> <p>
The following table describes the types and fields of the The following table describes the types and fields of the
<code>ComplicationData</code> object. <code>ComplicationData</code> object.
If a watch face requests a field that is invalid for a complication type,
a default value for the field is returned.
For example, if a watch face tries to access a <code>Long text</code>
field in a <code>SHORT_TEXT</code> type, the default value for the
<code>Long text</code> field is returned.
</p> </p>
<table> <table>
@@ -489,56 +927,80 @@ METADATA_KEY_PROVIDER_CONFIG_ACTION
</table> </table>
<p> <p>
In addition, the following two types have no fields. These two types may In addition, the types in the table below are for empty data and
be sent for any complication slot and do not need to be included in a may be sent for any complication slot. These types have no fields
list of supported types: and do not need to be included in a
list of supported types. These types enable watch
faces to differentiate among the following three cases:
</p>
<ul>
<li>No provider was chosen
</li>
<li>The user has selected "empty" for a slot
</li>
<li>A provider has no data to send
</li>
</ul>
<p>
Providers should not send <code>TYPE_EMPTY</code> in response to
update requests. Providers should send <code>TYPE_NO_DATA</code> instead.
</p>
<p>
Details on the complication types for "empty" data are in the
following table:
</p> </p>
<table> <table>
<tr> <tr>
<th style="width:175px"> <th>Complication type
Type
</th> </th>
<th style="width:175px"> <th>Description
Required fields
</th>
<th style="width:175px">
Optional fields
</th>
<th>
Notes
</th> </th>
</tr> </tr>
<tr> <tr>
<td> <td>
NOT_CONFIGURED <code>TYPE_NOT_CONFIGURED</code>
</td> </td>
<td> <td>
None Sent by the system when a complication is activated but the user has
</td> not selected a provider, and no default was set.
<td> <p>
None Cannot be sent by providers.
</td> </p>
<td>
Sent when a provider has not yet been chosen for a complication.
</td> </td>
</tr> </tr>
<tr> <tr>
<td> <td>
EMPTY <code>TYPE_EMPTY</code>
</td> </td>
<td> <td>
None Sent by the system when a complication is activated and the user has
chosen "empty" instead of a provider, or when the watch face has
chosen no provider, and this type, as the default.
<p>
Cannot be sent by providers.
</p>
</td>
</tr>
<tr>
<td>
<code>TYPE_NO_DATA</code>
</td> </td>
<td> <td>
None Sent by the system when a complication (that has a provider) is
</td> activated, to clear the complication before actual data is received
<td> from the provider.
Sent by a provider when there is no data to display in a <p>
complication, or sent by the system when nothing should be shown in a Should be sent by providers if they have no actual data to send.
complication. </p>
</td> </td>
</tr> </tr>
</table> </table>
@@ -700,8 +1162,8 @@ METADATA_KEY_PROVIDER_CONFIG_ACTION
</h2> </h2>
<p> <p>
The Complications API includes new classes in the Wearable Support The Complications API includes new classes in the wearable support
Library. For more information, download the <a href= library. For more information, download the <a href=
"{@docRoot}wear/preview/start.html#get_the_preview_reference_documentation"> "{@docRoot}wear/preview/start.html#get_the_preview_reference_documentation">
Android Wear 2.0 Preview Reference</a>. Android Wear 2.0 Preview Reference</a>.
</p> </p>
@@ -722,26 +1184,14 @@ METADATA_KEY_PROVIDER_CONFIG_ACTION
</li> </li>
<li> <li>
<code>ComplicationText</code> <code>ComplicationHelperActivity</code>
<ul> <ul>
<li>Used to supply text-based values in a <li>Used to request the following permission: <br>
<code>ComplicationData</code> object <code>com.google.android.wearable.permission.RECEIVE_COMPLICATION_DATA</code>
</li> </li>
<li>Includes options for time-dependent values, whose text value <li>Used instead of <code>ProviderChooserIntent</code>
depends on the current time to start the chooser in almost all cases
</li>
</ul>
</li>
<li>
<code>ComplicationProviderService</code>
<ul>
<li>Extends <code>Service</code> and includes callback methods to
respond to the complication system
</li>
<li>Callback methods are all called on the main thread
</li> </li>
</ul> </ul>
</li> </li>
@@ -759,13 +1209,35 @@ METADATA_KEY_PROVIDER_CONFIG_ACTION
</li> </li>
<li> <li>
<code>ProviderChooserIntent</code> <code>ComplicationProviderService</code>
<ul> <ul>
<li>Non-instantiable utility class <li>Extends <code>Service</code> and includes callback methods to
respond to the complication system
</li> </li>
<li>Includes a method that a watch face can call for starting a <li>Callback methods are all called on the main thread
provider chooser (to allow a user to configure complications) </li>
</ul>
</li>
<li>
<code>ComplicationText</code>
<ul>
<li>Used to supply text-based values in a
<code>ComplicationData</code> object
</li>
<li>Includes options for time-dependent values, whose text value
depends on the current time
</li>
</ul>
</li>
<li>
<code>ProviderChooserIntent</code>
<ul>
<li>Non-instantiable utility class that is not commonly used; use
<code>ComplicationHelperActivity</code> instead
</li> </li>
</ul> </ul>
</li> </li>
@@ -789,6 +1261,16 @@ METADATA_KEY_PROVIDER_CONFIG_ACTION
</li> </li>
</ul> </ul>
</li> </li>
<li>
<code>SystemProviders</code>
<ul>
<li>Lists system providers that are considered "safe",
because they only supply information that the watch face
already could obtain itself
</li>
</ul>
</li>
</ul> </ul>
<p> <p>