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devsite/source/_changelogs/4.0-dp1.md

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+---
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+title: Pebble SDK 4.0-dp1 - Changelog
+date: 2016-06-15
+---
+
+This is the first Developer Preview release of the brand new Pebble SDK 4.0.
+This changelog collects only changes visible to developers using the emulator.
+A complete changelog will be provided when 4.0 ships on physical watches.
+
+### Changes to Firmware
+
+* Added support for [Pebble 2](https://www.kickstarter.com/projects/597507018/pebble-2-time-2-and-core-an-entirely-new-3g-ultra).
+* Added [AppGlances](/guides/user-interfaces/appglance-c/) and Timeline 
+~~Peek~~ Quick View.
+
+### Changes to SDK
+
+* Added the new "Diorite" platform for the Pebble 2.
+* Added `PBL_COMPASS`, `PBL_SMARTSTRAP_POWER`, and `PBL_PLATFORM_DIORITE`
+  defines.
+* Added ``preferred_result_display_duration`` to get the recommended number of
+  milliseconds a result window should be visible before it should closed.
+* Added ``AppExitReason`` and ``exit_reason_set``
+for an application to be able to notify the system of
+[the reason it is exiting](/guides/user-interfaces/app-exit-reason/).
+* Added ``AppGlanceSlice``, ``AppGlanceResult``, ``AppGlanceReloadSession``,
+``app_glance_add_slice``, ``AppGlanceReloadCallback`` and ``app_glance_reload``.
+to support [AppGlances](/guides/user-interfaces/appglance-c/).
+* Added [Unobstructed Area APIs](/guides/user-interfaces/unobstructed-area/):
+``UnobstructedAreaWillChangeHandler``,
+``UnobstructedAreaChangeHandler``,
+``UnobstructedAreaDidChangeHandler``,
+``UnobstructedAreaHandlers``,
+``layer_get_unobstructed_bounds``,
+``unobstructed_area_service_subscribe``
+and ``unobstructed_area_service_unsubscribe``
+to enable a watchface to adapt to overlays partially obstructing it, such as
+during a Timeline ~~Peek~~ Quick View.
+* Added ``HealthMetricAlert``, ``HealthAggregation``, ``health_service_peek_current_value``,
+  ``health_service_peek_current_value``, ``health_service_aggregate_averaged``,
+  ``health_service_aggregate_averaged``,
+  ``health_service_metric_aggregate_averaged_accessible``,
+  ``health_service_register_metric_alert``,
+  ``health_service_register_metric_alert`` and
+  ``health_service_cancel_metric_alert`` in preparation for heart rate support.
+  Note that these are not yet implemented.
+* Report memory usage for Pebble Packages at build time.
+
+### Changes to Documentation
+
+* Added [AppGlances Guide](/guides/user-interfaces/appglance-c/)
+* Added [Unobstructed Area Guide](/guides/user-interfaces/unobstructed-area/)
+* Added [AppExitReason Guide](/guides/user-interfaces/app-exit-reason)
+* Added [One Click Action Guide](/guides/design-and-interaction/one-click-actions/)
+* Added API documentation for new ``HealthService``, ``App Glance``, ``UnobstructedArea`` and ``AppExitReason`` APIs.
+
+### Known Issues
+
+* Creating an ``AppGlanceSlice`` with a .expiration_time of
+  `APP_GLANCE_SLICE_NO_EXPIRATION_TIME` results in an AppGlanceSlice that is
+  never displayed.
+* The ``UnobstructedAreaHandlers`` object must be created before being passed into
+  the ``unobstructed_area_service_subscribe`` method.
+* The Diorite emulator is still a little shy and will occassionally shake upon
+  starting. If your emulator doesn't stop shaking, try installing an app - that
+  usually brings it out of its shell.