WatchFaceService

Artifact: androidx.wear.watchface:watchface

Added in 1.0.0

Kotlin |Java

public abstract class WatchFaceService extends WallpaperService

java.lang.Object
↳	android.content.Context
	↳	android.content.ContextWrapper
		↳	android.app.Service
			↳	android.service.wallpaper.WallpaperService
				↳	androidx.wear.watchface.WatchFaceService

Known direct subclasses

ListenableWatchFaceService, StatefulWatchFaceRuntimeService, StatefulWatchFaceService, WatchFaceRuntimeService

`ListenableWatchFaceService`	`ListenableFuture`-based compatibility wrapper around `WatchFaceService`'s suspending `WatchFaceService.createWatchFace`.
`StatefulWatchFaceRuntimeService`	`WatchFaceRuntimeService` is required to be stateless as multiple can be created in parallel.
`StatefulWatchFaceService`	`WatchFaceService` is required to be stateless as multiple can be created in parallel.
`WatchFaceRuntimeService`	WatchFaceRuntimeService is a special kind of `WatchFaceService`, which loads the watch face definition from another resource only watch face package (see the `resourceOnlyWatchFacePackageName` parameter passed to `createUserStyleSchema`, `createComplicationSlotsManager`, `createUserStyleFlavors` and `createWatchFace`).

Known indirect subclasses

ListenableStatefulWatchFaceRuntimeService, ListenableStatefulWatchFaceService, ListenableWatchFaceRuntimeService

`ListenableStatefulWatchFaceRuntimeService`	`ListenableFuture`-based compatibility wrapper around `WatchFaceRuntimeService`'s suspending `WatchFaceService.createWatchFace`.
`ListenableStatefulWatchFaceService`	`ListenableFuture`-based compatibility wrapper around `StatefulWatchFaceService`'s suspending `WatchFaceService.createWatchFace`.
`ListenableWatchFaceRuntimeService`	`ListenableFuture`-based compatibility wrapper around `WatchFaceRuntimeService`'s suspending `WatchFaceService.createWatchFace`.

WatchFaceService and WatchFace are a pair of classes intended to handle much of the boilerplate needed to implement a watch face without being too opinionated. The suggested structure of a WatchFaceService based watch face is:

import androidx.wear.watchface.CanvasComplicationFactory
import androidx.wear.watchface.CanvasType
import androidx.wear.watchface.ComplicationSlot
import androidx.wear.watchface.ComplicationSlotsManager
import androidx.wear.watchface.Renderer
import androidx.wear.watchface.WatchFace
import androidx.wear.watchface.WatchFaceService
import androidx.wear.watchface.WatchFaceType
import androidx.wear.watchface.WatchState
import androidx.wear.watchface.complications.ComplicationSlotBounds
import androidx.wear.watchface.complications.DefaultComplicationDataSourcePolicy
import androidx.wear.watchface.complications.SystemDataSources
import androidx.wear.watchface.complications.data.ComplicationExperimental
import androidx.wear.watchface.complications.data.ComplicationType
import androidx.wear.watchface.complications.rendering.CanvasComplicationDrawable
import androidx.wear.watchface.complications.rendering.ComplicationDrawable
import androidx.wear.watchface.style.CurrentUserStyleRepository
import androidx.wear.watchface.style.UserStyleSchema
import androidx.wear.watchface.style.UserStyleSetting
import androidx.wear.watchface.style.UserStyleSetting.ListUserStyleSetting
import androidx.wear.watchface.style.UserStyleSetting.Option
import androidx.wear.watchface.style.WatchFaceLayer

class ExampleCanvasWatchFaceService : WatchFaceService() {
    override fun createUserStyleSchema() =
        UserStyleSchema(
            listOf(
                ListUserStyleSetting(
                    UserStyleSetting.Id(COLOR_STYLE_SETTING),
                    resources,
                    R.string.colors_style_setting,
                    R.string.colors_style_setting_description,
                    icon = null,
                    options =
                        listOf(
                            ListUserStyleSetting.ListOption(
                                Option.Id(RED_STYLE),
                                resources,
                                R.string.colors_style_red,
                                R.string.colors_style_red_screen_reader,
                                icon = null
                            ),
                            ListUserStyleSetting.ListOption(
                                Option.Id(GREEN_STYLE),
                                resources,
                                R.string.colors_style_green,
                                R.string.colors_style_green_screen_reader,
                                icon = null
                            ),
                            ListUserStyleSetting.ListOption(
                                Option.Id(BLUE_STYLE),
                                resources,
                                R.string.colors_style_blue,
                                R.string.colors_style_blue_screen_reader,
                                icon = null
                            )
                        ),
                    listOf(
                        WatchFaceLayer.BASE,
                        WatchFaceLayer.COMPLICATIONS,
                        WatchFaceLayer.COMPLICATIONS_OVERLAY
                    )
                ),
                ListUserStyleSetting(
                    UserStyleSetting.Id(HAND_STYLE_SETTING),
                    resources,
                    R.string.hand_style_setting,
                    R.string.hand_style_setting_description,
                    icon = null,
                    options =
                        listOf(
                            ListUserStyleSetting.ListOption(
                                Option.Id(CLASSIC_STYLE),
                                resources,
                                R.string.hand_style_classic,
                                R.string.hand_style_classic_screen_reader,
                                icon = null
                            ),
                            ListUserStyleSetting.ListOption(
                                Option.Id(MODERN_STYLE),
                                resources,
                                R.string.hand_style_modern,
                                R.string.hand_style_modern_screen_reader,
                                icon = null
                            ),
                            ListUserStyleSetting.ListOption(
                                Option.Id(GOTHIC_STYLE),
                                resources,
                                R.string.hand_style_gothic,
                                R.string.hand_style_gothic_screen_reader,
                                icon = null
                            )
                        ),
                    listOf(WatchFaceLayer.COMPLICATIONS_OVERLAY)
                )
            )
        )

    @ComplicationExperimental
    override fun createComplicationSlotsManager(
        currentUserStyleRepository: CurrentUserStyleRepository
    ): ComplicationSlotsManager {
        val canvasComplicationFactory = CanvasComplicationFactory { watchState, listener ->
            CanvasComplicationDrawable(ComplicationDrawable(this), watchState, listener)
        }
        return ComplicationSlotsManager(
            listOf(
                ComplicationSlot.createRoundRectComplicationSlotBuilder(
                        /*id */ 0,
                        canvasComplicationFactory,
                        listOf(
                            ComplicationType.RANGED_VALUE,
                            ComplicationType.LONG_TEXT,
                            ComplicationType.SHORT_TEXT,
                            ComplicationType.MONOCHROMATIC_IMAGE,
                            ComplicationType.SMALL_IMAGE
                        ),
                        DefaultComplicationDataSourcePolicy(
                            SystemDataSources.DATA_SOURCE_DAY_OF_WEEK,
                            ComplicationType.SHORT_TEXT
                        ),
                        ComplicationSlotBounds(RectF(0.15625f, 0.1875f, 0.84375f, 0.3125f))
                    )
                    .build(),
                ComplicationSlot.createRoundRectComplicationSlotBuilder(
                        /*id */ 1,
                        canvasComplicationFactory,
                        listOf(
                            ComplicationType.RANGED_VALUE,
                            ComplicationType.LONG_TEXT,
                            ComplicationType.SHORT_TEXT,
                            ComplicationType.MONOCHROMATIC_IMAGE,
                            ComplicationType.SMALL_IMAGE
                        ),
                        DefaultComplicationDataSourcePolicy(
                            SystemDataSources.DATA_SOURCE_STEP_COUNT,
                            ComplicationType.SHORT_TEXT
                        ),
                        ComplicationSlotBounds(RectF(0.1f, 0.5625f, 0.35f, 0.8125f))
                    )
                    .build()
            ),
            currentUserStyleRepository
        )
    }

    inner class MySharedAssets : Renderer.SharedAssets {
        override fun onDestroy() {}
    }

    override suspend fun createWatchFace(
        surfaceHolder: SurfaceHolder,
        watchState: WatchState,
        complicationSlotsManager: ComplicationSlotsManager,
        currentUserStyleRepository: CurrentUserStyleRepository
    ) =
        WatchFace(
            WatchFaceType.ANALOG,
            object :
                Renderer.CanvasRenderer2<MySharedAssets>(
                    surfaceHolder,
                    currentUserStyleRepository,
                    watchState,
                    CanvasType.HARDWARE,
                    interactiveDrawModeUpdateDelayMillis = 16,
                    clearWithBackgroundTintBeforeRenderingHighlightLayer = true
                ) {
                init {
                    // Listen for user style changes.
                    CoroutineScope(Dispatchers.Main.immediate).launch {
                        currentUserStyleRepository.userStyle.collect {
                            // `userStyle` will contain two userStyle categories with options
                            // from the lists above. ..
                        }
                    }
                }

                override fun render(
                    canvas: Canvas,
                    bounds: Rect,
                    zonedDateTime: ZonedDateTime,
                    sharedAssets: MySharedAssets
                ) {
                    // ...
                }

                override fun renderHighlightLayer(
                    canvas: Canvas,
                    bounds: Rect,
                    zonedDateTime: ZonedDateTime,
                    sharedAssets: MySharedAssets
                ) {
                    canvas.drawColor(renderParameters.highlightLayer!!.backgroundTint)

                    // ...
                }

                override suspend fun createSharedAssets(): MySharedAssets {
                    // Insert resource loading here.
                    return MySharedAssets()
                }
            }
        )
}

return ExampleCanvasWatchFaceService()

Sub classes of WatchFaceService are expected to implement createWatchFace which is the factory for making WatchFaces. If the watch faces uses complications then createComplicationSlotsManager should be overridden. All ComplicationSlots are assumed to be enumerated up upfront and passed as a collection into ComplicationSlotsManager's constructor which is returned by createComplicationSlotsManager.

WatchFaceServices are required to be stateless as multiple can be created in parallel. If per instance state is required please use StatefulWatchFaceService.

Watch face styling (color and visual look of watch face elements such as numeric fonts, watch hands and ticks, etc...) and companion editing is directly supported via UserStyleSchema and UserStyleSetting. To enable support for styling override createUserStyleSchema.

WatchFaceService can expose pre-populated style presets by overriding createUserStyleFlavors or via XML (see below). Each presents represents separate style configured with UserStyle and complication slot policies configured with androidx.wear.watchface.complications.DefaultComplicationDataSourcePolicy. The system will only access flavors if metadata tag is present in manifest:

    <meta-data
      android:name="androidx.wear.watchface.FLAVORS_SUPPORTED"
      android:value="true" />

WatchFaces are initially constructed on a background thread before being used exclusively on the ui thread afterwards. There is a memory barrier between construction and rendering so no special threading primitives are required.

To aid debugging watch face animations, WatchFaceService allows you to speed up or slow down time, and to loop between two instants. This is controlled by MOCK_TIME_INTENT intents with a float extra called "androidx.wear.watchface.extra.MOCK_TIME_SPEED_MULTIPLIE" and to long extras called "androidx.wear.watchface.extra.MOCK_TIME_WRAPPING_MIN_TIME" and "androidx.wear.watchface.extra.MOCK_TIME_WRAPPING_MAX_TIME" (which are UTC time in milliseconds). If minTime is omitted or set to -1 then the current time is sampled as minTime.

E.g., to make time go twice as fast: adb shell am broadcast -a androidx.wear.watchface.MockTime
--ef androidx.wear.watchface.extra.MOCK_TIME_SPEED_MULTIPLIER 2.0

To use the sample on watch face editor UI, import the wear:wear-watchface-editor-samples library and add the following into your watch face's AndroidManifest.xml:

<activity
  android:name="androidx.wear.watchface.editor.sample.WatchFaceConfigActivity"
  android:exported="true"
  android:label="Config"
  android:theme="@android:style/Theme.Translucent.NoTitleBar">
  <intent-filter>
    <action android:name="androidx.wear.watchface.editor.action.WATCH_FACE_EDITOR" />
    <category android:name=
        "com.google.android.wearable.watchface.category.WEARABLE_CONFIGURATION" />
    <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>
</activity>

To register a WatchFaceService with the system add a tag to the in your watch face's AndroidManifest.xml:

<service
  android:name=".MyWatchFaceServiceClass"
  android:exported="true"
  android:label="@string/watch_face_name"
  android:permission="android.permission.BIND_WALLPAPER">
  <intent-filter>
    <action android:name="android.service.wallpaper.WallpaperService" />
    <category android:name="com.google.android.wearable.watchface.category.WATCH_FACE" />
  </intent-filter>
  <meta-data
     android:name="com.google.android.wearable.watchface.preview"
     android:resource="@drawable/my_watch_preview" />
  <meta-data
    android:name="com.google.android.wearable.watchface.preview_circular"
    android:resource="@drawable/my_watch_circular_preview" />
  <meta-data
    android:name="com.google.android.wearable.watchface.wearableConfigurationAction"
    android:value="androidx.wear.watchface.editor.action.WATCH_FACE_EDITOR"/>
  <meta-data
    android:name="android.service.wallpaper"
    android:resource="@xml/watch_face" />
  <meta-data
    android:name=
       "com.google.android.wearable.watchface.companionBuiltinConfigurationEnabled"
    android:value="true" />
</service>

Multiple watch faces can be defined in the same package, requiring multiple tags.

By default the system will only allow the user to create a single instance of the watch face. You can choose to allow the user to create multiple instances (each with their own styling and a distinct WatchState.watchFaceInstanceId) by adding this meta-data to your watch face's manifest:

    <meta-data
      android:name="androidx.wear.watchface.MULTIPLE_INSTANCES_ALLOWED"
      android:value="true" />

A watch face can declare the UserStyleSchema, ComplicationSlots and UserStyleFlavors in XML. The main advantage is simplicity for the developer, however meta data queries (see androidx.wear.watchface.client.WatchFaceMetadataClient) are faster because they can be performed without having to bind to the WatchFaceService.

To use xml inflation, add an androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta date tag to your service:

    <meta-data
        android:name="androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition"
        android:resource="@xml/my_watchface_definition" />

And the linked xml/my_watchface_definition resource must contain a XmlWatchFace node. E.g.:

     <XmlWatchFace xmlns:android="http://schemas.android.com/apk/res/android"
             xmlns:app="http://schemas.android.com/apk/res-auto">
         <UserStyleSchema>
             <ListUserStyleSetting
                 android:icon="@drawable/time_style_icon"
                 app:affectedWatchFaceLayers="BASE|COMPLICATIONS|COMPLICATIONS_OVERLAY"
                 app:defaultOptionIndex="1"
                 app:description="@string/time_style_description"
                 app:displayName="@string/time_style_name"
                 app:id="TimeStyle">
                 <ListOption
                     android:icon="@drawable/time_style_minimal_icon"
                     app:displayName="@string/time_style_minimal_name"
                     app:id="minimal" />
                 <ListOption
                     android:icon="@drawable/time_style_seconds_icon"
                     app:displayName="@string/time_style_seconds_name"
                     app:id="seconds" />
             </ListUserStyleSetting>
        </UserStyleSchema>
        </ComplicationSlot>
             app:slotId="1"
             app:boundsType="ROUND_RECT"
             app:supportedTypes="SHORT_TEXT|RANGED_VALUE|SMALL_IMAGE"
             app:defaultDataSourceType="RANGED_VALUE"
             app:systemDataSourceFallback="DATA_SOURCE_WATCH_BATTERY">
             <ComplicationSlotBounds
                 app:left="0.3" app:top="0.7" app:right="0.7" app:bottom="0.9"/>
         </ComplicationSlot>
         <UserStyleFlavors>
             <UserStyleFlavor app:id="flavor1">
                 <StyleOption app:id="TimeStyle" app:value="minimal"/>
                 <ComplicationPolicy
                     app:slotId="1"
                     app:primaryDataSource="com.package/com.app"
                     app:primaryDataSourceDefaultType="SHORT_TEXT"
                     app:systemDataSourceFallback="DATA_SOURCE_DAY_AND_DATE"
                     app:systemDataSourceFallbackDefaultType="SHORT_TEXT"/>
             </UserStyleFlavor>
         </UserStyleFlavors>
    </XmlWatchFace>

If you use resources references to specify identifiers, they should be locale independent (i.e. translatable="false").

If you use XmlSchemaAndComplicationSlotsDefinition then you shouldn't override createUserStyleSchema or createComplicationSlotsManager. However if tags are defined then you must override getComplicationSlotInflationFactory in order to provide the CanvasComplicationFactory and where necessary edge complication ComplicationTapFilters.

Note the tag does not support configExtras because in general a Bundle can not be inflated from XML.

Note it is an error to define a XmlSchemaAndComplicationSlotsDefinition and not use it.

As of Wear OS 4, complications can provide data using dynamic values, that the platform evaluates continuously and sends the evaluated results to the watch face. Privileged watch faces that can utilize the unevaluated dynamic values, can include the privileged permission com.google.wear.permission.GET_COMPLICATION_DYNAMIC_VALUE in their manifest, which will tell the system to avoid pruning them from the ComplicationData, where they will show up in the relevant fields next to the evaluated values.

Summary

Constants
`static final int`	`MAX_CREATE_WATCHFACE_TIME_MILLIS = 5000` The maximum permitted duration of `WatchFaceService.createWatchFace`.

Public constructors
`WatchFaceService()`

Public methods
`final @NonNull Handler`	`getBackgroundThreadHandler()` Returns the lazily constructed background thread `Handler`.
`final @NonNull Handler`	`getUiThreadHandler()` Returns the ui thread `Handler`.
`void`	`onConfigurationChanged(@NonNull Configuration newConfig)`
`final @NonNull WallpaperService.Engine`	`onCreateEngine()` Creates an interactive engine for WallpaperService.

Protected methods
`@NonNull ComplicationSlotsManager`	`@WorkerThread createComplicationSlotsManager( @NonNull CurrentUserStyleRepository currentUserStyleRepository )` If the WatchFaceService's manifest doesn't define a androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta data tag then override this factory method to create a non-empty `ComplicationSlotsManager`.
`@NonNull UserStyleFlavors`	`@WorkerThread createUserStyleFlavors( @NonNull CurrentUserStyleRepository currentUserStyleRepository, @NonNull ComplicationSlotsManager complicationSlotsManager )` If the WatchFaceService's manifest doesn't define a androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta data tag then override this factory method to create non-empty `UserStyleFlavors`.
`@NonNull UserStyleSchema`	`@WorkerThread createUserStyleSchema()` If the WatchFaceService's manifest doesn't define an androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta data tag then override this factory method to create a non-empty `UserStyleSchema`.
`abstract @NonNull WatchFace`	`@WorkerThread createWatchFace( @NonNull SurfaceHolder surfaceHolder, @NonNull WatchState watchState, @NonNull ComplicationSlotsManager complicationSlotsManager, @NonNull CurrentUserStyleRepository currentUserStyleRepository )` Override this factory method to create your WatchFaceImpl.
`void`	`@UiThread dump( @NonNull FileDescriptor fd, @NonNull PrintWriter writer, @NonNull String[] args )`
`ComplicationSlotInflationFactory`	`@WorkerThread getComplicationSlotInflationFactory()` This method is deprecated. Use the version with currentUserStyleRepository argument instead
`@NonNull ComplicationSlotInflationFactory`	`@WorkerThread getComplicationSlotInflationFactory( @NonNull CurrentUserStyleRepository currentUserStyleRepository )` Used when inflating `ComplicationSlot`s from XML (i.e the manifest contains androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition metadata) to provide a `ComplicationSlotInflationFactory` which provides the `CanvasComplicationFactory` and where necessary edge complication `ComplicationTapFilter`s needed for inflating `ComplicationSlot`s.

Inherited methods

From android.content.Context

`boolean`	`bindIsolatedService( @NonNull Intent p0, @NonNull Context.BindServiceFlags p1, @NonNull String p2, @NonNull Executor p3, @NonNull ServiceConnection p4 )`
`final int`	`getColor(int p0)`
`final @NonNull ColorStateList`	`getColorStateList(int p0)`
`final @Nullable Drawable`	`getDrawable(int p0)`
`final @NonNull String`	`getString(int p0)`
`final @NonNull String`	`getString(int p0, @NonNull Object p1)`
`final @NonNull T`	`<T extends Object> getSystemService(@NonNull Class<@NonNull T> p0)`
`final @NonNull CharSequence`	`getText(int p0)`
`final @NonNull TypedArray`	`obtainStyledAttributes(@NonNull int[] p0)`
`final @NonNull TypedArray`	`obtainStyledAttributes(@Nullable AttributeSet p0, @NonNull int[] p1)`
`final @NonNull TypedArray`	`obtainStyledAttributes(int p0, @NonNull int[] p1)`
`final @NonNull TypedArray`	`obtainStyledAttributes( @Nullable AttributeSet p0, @NonNull int[] p1, int p2, int p3 )`
`void`	`revokeSelfPermissionOnKill(@NonNull String p0)`
`void`	`sendBroadcastWithMultiplePermissions( @NonNull Intent p0, @NonNull String[] p1 )`

From android.content.ContextWrapper

`boolean`	`bindIsolatedService( @NonNull Intent p0, int p1, @NonNull String p2, @NonNull Executor p3, @NonNull ServiceConnection p4 )`
`boolean`	`bindService( @NonNull Intent p0, @NonNull ServiceConnection p1, @NonNull Context.BindServiceFlags p2 )`
`boolean`	`bindService(@NonNull Intent p0, @NonNull ServiceConnection p1, int p2)`
`boolean`	`bindService( @NonNull Intent p0, @NonNull Context.BindServiceFlags p1, @NonNull Executor p2, @NonNull ServiceConnection p3 )`
`boolean`	`bindService( @NonNull Intent p0, int p1, @NonNull Executor p2, @NonNull ServiceConnection p3 )`
`boolean`	`bindServiceAsUser( @NonNull Intent p0, @NonNull ServiceConnection p1, @NonNull Context.BindServiceFlags p2, @NonNull UserHandle p3 )`
`boolean`	`bindServiceAsUser( @NonNull Intent p0, @NonNull ServiceConnection p1, int p2, @NonNull UserHandle p3 )`
`int`	`checkCallingOrSelfPermission(@NonNull String p0)`
`int`	`checkCallingOrSelfUriPermission(@NonNull Uri p0, int p1)`
`@NonNull int[]`	`checkCallingOrSelfUriPermissions(@NonNull List<@NonNull Uri> p0, int p1)`
`int`	`checkCallingPermission(@NonNull String p0)`
`int`	`checkCallingUriPermission(@NonNull Uri p0, int p1)`
`@NonNull int[]`	`checkCallingUriPermissions(@NonNull List<@NonNull Uri> p0, int p1)`
`int`	`checkPermission(@NonNull String p0, int p1, int p2)`
`int`	`checkSelfPermission(@NonNull String p0)`
`int`	`checkUriPermission(@NonNull Uri p0, int p1, int p2, int p3)`
`int`	`checkUriPermission( @Nullable Uri p0, @Nullable String p1, @Nullable String p2, int p3, int p4, int p5 )`
`@NonNull int[]`	`checkUriPermissions(@NonNull List<@NonNull Uri> p0, int p1, int p2, int p3)`
`void`	`clearWallpaper()` This method is deprecated. Deprecated in Java
`@NonNull Context`	`createAttributionContext(@Nullable String p0)`
`@NonNull Context`	`createConfigurationContext(@NonNull Configuration p0)`
`@NonNull Context`	`createContext(@NonNull ContextParams p0)`
`@NonNull Context`	`createContextForSplit(@NonNull String p0)`
`@NonNull Context`	`createDeviceContext(int p0)`
`@NonNull Context`	`createDeviceProtectedStorageContext()`
`@NonNull Context`	`createDisplayContext(@NonNull Display p0)`
`@NonNull Context`	`createPackageContext(@NonNull String p0, int p1)`
`@NonNull Context`	`createWindowContext(int p0, @Nullable Bundle p1)`
`@NonNull Context`	`createWindowContext(@NonNull Display p0, int p1, @Nullable Bundle p2)`
`@NonNull String[]`	`databaseList()`
`boolean`	`deleteDatabase(@NonNull String p0)`
`boolean`	`deleteFile(@NonNull String p0)`
`boolean`	`deleteSharedPreferences(@NonNull String p0)`
`void`	`enforceCallingOrSelfPermission(@NonNull String p0, @Nullable String p1)`
`void`	`enforceCallingOrSelfUriPermission( @NonNull Uri p0, int p1, @NonNull String p2 )`
`void`	`enforceCallingPermission(@NonNull String p0, @Nullable String p1)`
`void`	`enforceCallingUriPermission(@NonNull Uri p0, int p1, @NonNull String p2)`
`void`	`enforcePermission(@NonNull String p0, int p1, int p2, @Nullable String p3)`
`void`	`enforceUriPermission( @NonNull Uri p0, int p1, int p2, int p3, @NonNull String p4 )`
`void`	`enforceUriPermission( @Nullable Uri p0, @Nullable String p1, @Nullable String p2, int p3, int p4, int p5, @Nullable String p6 )`
`@NonNull String[]`	`fileList()`
`@NonNull Context`	`getApplicationContext()`
`@NonNull ApplicationInfo`	`getApplicationInfo()`
`@NonNull AssetManager`	`getAssets()`
`@NonNull AttributionSource`	`getAttributionSource()`
`@Nullable String`	`getAttributionTag()`
`@NonNull Context`	`getBaseContext()`
`@NonNull File`	`getCacheDir()`
`@NonNull ClassLoader`	`getClassLoader()`
`@NonNull File`	`getCodeCacheDir()`
`@NonNull ContentResolver`	`getContentResolver()`
`@NonNull File`	`getDataDir()`
`@NonNull File`	`getDatabasePath(@NonNull String p0)`
`int`	`getDeviceId()`
`@NonNull File`	`getDir(@NonNull String p0, int p1)`
`@Nullable Display`	`getDisplay()`
`@Nullable File`	`getExternalCacheDir()`
`@NonNull File[]`	`getExternalCacheDirs()`
`@Nullable File`	`getExternalFilesDir(@Nullable String p0)`
`@NonNull File[]`	`getExternalFilesDirs(@NonNull String p0)`
`@NonNull File[]`	`getExternalMediaDirs()`
`@NonNull File`	`getFileStreamPath(@NonNull String p0)`
`@NonNull File`	`getFilesDir()`
`@NonNull Executor`	`getMainExecutor()`
`@NonNull Looper`	`getMainLooper()`
`@NonNull File`	`getNoBackupFilesDir()`
`@NonNull File`	`getObbDir()`
`@NonNull File[]`	`getObbDirs()`
`@NonNull String`	`getOpPackageName()`
`@NonNull String`	`getPackageCodePath()`
`@NonNull PackageManager`	`getPackageManager()`
`@NonNull String`	`getPackageName()`
`@NonNull String`	`getPackageResourcePath()`
`@Nullable ContextParams`	`getParams()`
`@NonNull Resources`	`getResources()`
`@NonNull SharedPreferences`	`getSharedPreferences(@NonNull String p0, int p1)`
`@NonNull Object`	`getSystemService(@NonNull String p0)`
`String`	`getSystemServiceName(@NonNull Class<@NonNull ?> p0)`
`@NonNull Resources.Theme`	`getTheme()`
`@NonNull Drawable`	`getWallpaper()` This method is deprecated. Deprecated in Java
`int`	`getWallpaperDesiredMinimumHeight()` This method is deprecated. Deprecated in Java
`int`	`getWallpaperDesiredMinimumWidth()` This method is deprecated. Deprecated in Java
`void`	`grantUriPermission(@NonNull String p0, @NonNull Uri p1, int p2)`
`boolean`	`isDeviceProtectedStorage()`
`boolean`	`isRestricted()`
`boolean`	`isUiContext()`
`boolean`	`moveDatabaseFrom(@NonNull Context p0, @NonNull String p1)`
`boolean`	`moveSharedPreferencesFrom(@NonNull Context p0, @NonNull String p1)`
`@NonNull FileInputStream`	`openFileInput(@NonNull String p0)`
`@NonNull FileOutputStream`	`openFileOutput(@NonNull String p0, int p1)`
`@NonNull SQLiteDatabase`	`openOrCreateDatabase( @NonNull String p0, int p1, @NonNull SQLiteDatabase.CursorFactory p2 )`
`@NonNull SQLiteDatabase`	`openOrCreateDatabase( @NonNull String p0, int p1, @NonNull SQLiteDatabase.CursorFactory p2, @Nullable DatabaseErrorHandler p3 )`
`@NonNull Drawable`	`peekWallpaper()` This method is deprecated. Deprecated in Java
`void`	`registerComponentCallbacks(@NonNull ComponentCallbacks p0)`
`void`	`registerDeviceIdChangeListener( @NonNull Executor p0, @NonNull IntConsumer p1 )`
`Intent`	`registerReceiver(@Nullable BroadcastReceiver p0, @NonNull IntentFilter p1)`
`Intent`	`registerReceiver( @Nullable BroadcastReceiver p0, @NonNull IntentFilter p1, int p2 )`
`Intent`	`registerReceiver( @Nullable BroadcastReceiver p0, @NonNull IntentFilter p1, @Nullable String p2, @Nullable Handler p3 )`
`Intent`	`registerReceiver( @Nullable BroadcastReceiver p0, @NonNull IntentFilter p1, @Nullable String p2, @Nullable Handler p3, int p4 )`
`void`	`removeStickyBroadcast(@NonNull Intent p0)` This method is deprecated. Deprecated in Java
`void`	`removeStickyBroadcastAsUser(@NonNull Intent p0, @NonNull UserHandle p1)` This method is deprecated. Deprecated in Java
`void`	`revokeSelfPermissionsOnKill(@NonNull Collection<@NonNull String> p0)`
`void`	`revokeUriPermission(@NonNull Uri p0, int p1)`
`void`	`revokeUriPermission(@NonNull String p0, @NonNull Uri p1, int p2)`
`void`	`sendBroadcast(@NonNull Intent p0)`
`void`	`sendBroadcast(@NonNull Intent p0, @Nullable String p1)`
`void`	`sendBroadcast(@NonNull Intent p0, @Nullable String p1, @Nullable Bundle p2)`
`void`	`sendBroadcastAsUser(@NonNull Intent p0, @NonNull UserHandle p1)`
`void`	`sendBroadcastAsUser(@NonNull Intent p0, @NonNull UserHandle p1, String p2)`
`void`	`sendOrderedBroadcast(@NonNull Intent p0, @Nullable String p1)`
`void`	`sendOrderedBroadcast( @NonNull Intent p0, @Nullable String p1, @Nullable Bundle p2 )`
`void`	`sendOrderedBroadcast( @NonNull Intent p0, @Nullable String p1, @Nullable BroadcastReceiver p2, @Nullable Handler p3, int p4, @Nullable String p5, @Nullable Bundle p6 )`
`void`	`sendOrderedBroadcast( @NonNull Intent p0, @Nullable String p1, @Nullable Bundle p2, @Nullable BroadcastReceiver p3, @Nullable Handler p4, int p5, @Nullable String p6, @Nullable Bundle p7 )`
`void`	`sendOrderedBroadcast( @NonNull Intent p0, @Nullable String p1, @Nullable String p2, @Nullable BroadcastReceiver p3, @Nullable Handler p4, int p5, @Nullable String p6, @Nullable Bundle p7 )`
`void`	`sendOrderedBroadcast( @NonNull Intent p0, int p1, @Nullable String p2, @Nullable String p3, @Nullable BroadcastReceiver p4, @Nullable Handler p5, @Nullable String p6, @Nullable Bundle p7, @Nullable Bundle p8 )`
`void`	`sendOrderedBroadcastAsUser( @NonNull Intent p0, @NonNull UserHandle p1, @Nullable String p2, @Nullable BroadcastReceiver p3, @Nullable Handler p4, int p5, @Nullable String p6, @Nullable Bundle p7 )`
`void`	`sendStickyBroadcast(@NonNull Intent p0)` This method is deprecated. Deprecated in Java
`void`	`sendStickyBroadcast(@NonNull Intent p0, @Nullable Bundle p1)` This method is deprecated. Deprecated in Java
`void`	`sendStickyBroadcastAsUser(@NonNull Intent p0, @NonNull UserHandle p1)` This method is deprecated. Deprecated in Java
`void`	`sendStickyOrderedBroadcast( @NonNull Intent p0, @Nullable BroadcastReceiver p1, @Nullable Handler p2, int p3, @Nullable String p4, @Nullable Bundle p5 )` This method is deprecated. Deprecated in Java
`void`	`sendStickyOrderedBroadcastAsUser( @NonNull Intent p0, @NonNull UserHandle p1, @Nullable BroadcastReceiver p2, @Nullable Handler p3, int p4, @Nullable String p5, @Nullable Bundle p6 )` This method is deprecated. Deprecated in Java
`void`	`setTheme(int p0)`
`void`	`setWallpaper(@NonNull Bitmap p0)` This method is deprecated. Deprecated in Java
`void`	`setWallpaper(@NonNull InputStream p0)` This method is deprecated. Deprecated in Java
`void`	`startActivities(@NonNull Intent[] p0)`
`void`	`startActivities(@NonNull Intent[] p0, @Nullable Bundle p1)`
`void`	`startActivity(@NonNull Intent p0)`
`void`	`startActivity(@NonNull Intent p0, @Nullable Bundle p1)`
`@Nullable ComponentName`	`startForegroundService(@NonNull Intent p0)`
`boolean`	`startInstrumentation( @NonNull ComponentName p0, @Nullable String p1, @Nullable Bundle p2 )`
`void`	`startIntentSender( @NonNull IntentSender p0, @Nullable Intent p1, int p2, int p3, int p4 )`
`void`	`startIntentSender( @NonNull IntentSender p0, @Nullable Intent p1, int p2, int p3, int p4, @Nullable Bundle p5 )`
`@Nullable ComponentName`	`startService(@NonNull Intent p0)`
`boolean`	`stopService(@NonNull Intent p0)`
`void`	`unbindService(@NonNull ServiceConnection p0)`
`void`	`unregisterComponentCallbacks(@NonNull ComponentCallbacks p0)`
`void`	`unregisterDeviceIdChangeListener(@NonNull IntConsumer p0)`
`void`	`unregisterReceiver(@NonNull BroadcastReceiver p0)`
`void`	`updateServiceGroup(@NonNull ServiceConnection p0, int p1, int p2)`

From android.app.Service

`void`	`attachBaseContext(@NonNull Context p0)`
`final @NonNull Application`	`getApplication()`
`final int`	`getForegroundServiceType()`
`void`	`onLowMemory()`
`void`	`onRebind(@NonNull Intent p0)`
`void`	`onStart(@NonNull Intent p0, int p1)` This method is deprecated. Deprecated in Java
`int`	`onStartCommand(@NonNull Intent p0, int p1, int p2)`
`void`	`onTaskRemoved(@NonNull Intent p0)`
`void`	`onTimeout(int p0)`
`void`	`onTrimMemory(int p0)`
`boolean`	`onUnbind(@NonNull Intent p0)`
`final void`	`startForeground(int p0, @NonNull Notification p1)`
`final void`	`startForeground(int p0, @NonNull Notification p1, int p2)`
`final void`	`stopForeground(boolean p0)` This method is deprecated. Deprecated in Java
`final void`	`stopForeground(int p0)`
`final void`	`stopSelf()`
`final void`	`stopSelf(int p0)`
`final boolean`	`stopSelfResult(int p0)`

From android.service.wallpaper.WallpaperService

`final IBinder`	`onBind(@NonNull Intent p0)`
`void`	`onCreate()`
`void`	`onDestroy()`

Constants

MAX_CREATE_WATCHFACE_TIME_MILLIS

public static final int MAX_CREATE_WATCHFACE_TIME_MILLIS = 5000

The maximum permitted duration of WatchFaceService.createWatchFace.

Public constructors

WatchFaceService

Added in 1.0.0

public WatchFaceService()

Public methods

getBackgroundThreadHandler

Added in 1.0.0

public final @NonNull Handler getBackgroundThreadHandler()

Returns the lazily constructed background thread Handler. During initialization createUserStyleSchema, createComplicationSlotsManager and createWatchFace are posted on this handler.

getUiThreadHandler

Added in 1.0.0

public final @NonNull Handler getUiThreadHandler()

Returns the ui thread Handler.

onConfigurationChanged

public void onConfigurationChanged(@NonNull Configuration newConfig)

onCreateEngine

Added in 1.0.0

public final @NonNull WallpaperService.Engine onCreateEngine()

Creates an interactive engine for WallpaperService.

Protected methods

createComplicationSlotsManager

Added in 1.0.0

@WorkerThread
protected @NonNull ComplicationSlotsManager createComplicationSlotsManager(
    @NonNull CurrentUserStyleRepository currentUserStyleRepository
)

If the WatchFaceService's manifest doesn't define a androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta data tag then override this factory method to create a non-empty ComplicationSlotsManager. This manager will be passed to createUserStyleFlavors and createWatchFace. This will be called from a background thread but the ComplicationSlotsManager should be accessed exclusively from the UiThread afterwards.

Parameters
`@NonNull CurrentUserStyleRepository currentUserStyleRepository`	The `CurrentUserStyleRepository` constructed using the `UserStyleSchema` returned by `createUserStyleSchema`.

Returns
`@NonNull ComplicationSlotsManager`	The `ComplicationSlotsManager` to pass into `createWatchFace`.

createUserStyleFlavors

Added in 1.2.0

@WorkerThread
protected @NonNull UserStyleFlavors createUserStyleFlavors(
    @NonNull CurrentUserStyleRepository currentUserStyleRepository,
    @NonNull ComplicationSlotsManager complicationSlotsManager
)

If the WatchFaceService's manifest doesn't define a androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta data tag then override this factory method to create non-empty UserStyleFlavors. This is called on a background thread. The system reads the flavors once and changes may be ignored until the APK is updated. Metadata tag "androidx.wear.watchface.FLAVORS_SUPPORTED" should be added to let the system know the service supports flavors.

Parameters
`@NonNull CurrentUserStyleRepository currentUserStyleRepository`	The `CurrentUserStyleRepository` constructed using the `UserStyleSchema` returned by `createUserStyleSchema`.
`@NonNull ComplicationSlotsManager complicationSlotsManager`	The `ComplicationSlotsManager` returned by `createComplicationSlotsManager`

Returns
`@NonNull UserStyleFlavors`	The `UserStyleFlavors`, which is exposed to the system.

createUserStyleSchema

Added in 1.0.0

@WorkerThread
protected @NonNull UserStyleSchema createUserStyleSchema()

If the WatchFaceService's manifest doesn't define an androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition meta data tag then override this factory method to create a non-empty UserStyleSchema. A CurrentUserStyleRepository constructed with this schema will be passed to createComplicationSlotsManager, createUserStyleFlavors and createWatchFace. This is called on a background thread.

Returns
`@NonNull UserStyleSchema`	The `UserStyleSchema` to create a `CurrentUserStyleRepository` with, which is passed to `createComplicationSlotsManager` and `createWatchFace`.

createWatchFace

@WorkerThread
protected abstract @NonNull WatchFace createWatchFace(
    @NonNull SurfaceHolder surfaceHolder,
    @NonNull WatchState watchState,
    @NonNull ComplicationSlotsManager complicationSlotsManager,
    @NonNull CurrentUserStyleRepository currentUserStyleRepository
)

Override this factory method to create your WatchFaceImpl. This method will be called by the library on a background thread, if possible any expensive initialization should be done asynchronously. The WatchFace and its Renderer should be accessed exclusively from the UiThread afterwards. There is a memory barrier between construction and rendering so no special threading primitives are required.

Warning the system will likely time out waiting for watch face initialization if it takes longer than MAX_CREATE_WATCHFACE_TIME_MILLIS milliseconds.

Parameters
`@NonNull SurfaceHolder surfaceHolder`	The `SurfaceHolder` to pass to the `Renderer`'s constructor.
`@NonNull WatchState watchState`	The `WatchState` for the watch face.
`@NonNull ComplicationSlotsManager complicationSlotsManager`	The `ComplicationSlotsManager` returned by `createComplicationSlotsManager`.
`@NonNull CurrentUserStyleRepository currentUserStyleRepository`	The `CurrentUserStyleRepository` constructed using the `UserStyleSchema` returned by `createUserStyleSchema`.

Returns
`@NonNull WatchFace`	A `WatchFace` whose `Renderer` uses the provided `surfaceHolder`.

dump

@UiThread
protected void dump(
    @NonNull FileDescriptor fd,
    @NonNull PrintWriter writer,
    @NonNull String[] args
)

getComplicationSlotInflationFactory

Added in 1.1.0

Deprecated in 1.2.0

@WorkerThread
protected ComplicationSlotInflationFactory getComplicationSlotInflationFactory()

Used when inflating ComplicationSlots from XML (i.e the manifest contains androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition metadata) to provide a ComplicationSlotInflationFactory which provides the CanvasComplicationFactory and where necessary edge complication ComplicationTapFilters needed for inflating ComplicationSlots.

If an androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition metadata tag is defined for your WatchFaceService 's manifest, and your XML includes tags then you must override this method.

getComplicationSlotInflationFactory

Added in 1.2.0

@WorkerThread
protected @NonNull ComplicationSlotInflationFactory getComplicationSlotInflationFactory(
    @NonNull CurrentUserStyleRepository currentUserStyleRepository
)

If an androidx.wear.watchface.XmlSchemaAndComplicationSlotsDefinition metadata tag is defined for your WatchFaceService 's manifest, and your XML includes tags then you must override this method. A NotImplementedError exception will be thrown if you don't.

Parameters
`@NonNull CurrentUserStyleRepository currentUserStyleRepository`	The `CurrentUserStyleRepository` constructed using the `UserStyleSchema` returned by `createUserStyleSchema`.