Make all widgets collapsed in the full widget picker by default
Changes:
1. Add a WidgetListHeader view for showing icon, app name and a subtitle.
2. Only WidgetListHeaders are always visible to users in the full widget
picker.
3. Only one widgets list from an app is visible in the full widget picker
at any one time.
Test: Auto: run add robolectric tests under widget/picker
Manual: Open full widgets picker. Then, expand and collapse apps.
Video: https://drive.google.com/file/d/1gzfeEm5IOAu0qHsO77OTS2eMfU7CHJiL/view?usp=sharing
Bug: 179797520
Change-Id: Idac58be23dfeafcb79b3c61b4972d3addb462de1
diff --git a/res/drawable/widgets_tray_expand_button.xml b/res/drawable/widgets_tray_expand_button.xml
new file mode 100644
index 0000000..8316e0f
--- /dev/null
+++ b/res/drawable/widgets_tray_expand_button.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 The Android Open Source Project
+
+ 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.
+-->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+ <item android:state_checked="true"
+ android:drawable="@drawable/ic_expand_less" />
+ <item android:state_checked="false"
+ android:drawable="@drawable/ic_expand_more" />
+</selector>