added google folder

RecyclerViewKotlin/.google/packaging.yaml

@@ -0,0 +1,19 @@
+
+# GOOGLE SAMPLE PACKAGING DATA
+#
+# This file is used by Google as part of our samples packaging process.
+# End users may safely ignore this file. It has no relevance to other systems.
+---
+status:       PUBLISHED
+technologies: [Android]
+categories:   [Views Widgets]
+languages:    [Kotlin]
+solutions:    [Mobile]
+github:       android/views-widgets
+level:        INTERMEDIATE
+icon:         screenshots/icon-web.png
+apiRefs:
+    - androidx.recyclerview.widget.RecyclerView
+    - androidx.recyclerview.widget.RecyclerView.LayoutManager
+    - androidx.recyclerview.widget.RecyclerView.ViewHolder
+license:      apache2

RecyclerViewKotlin/README.md

@@ -1,5 +1,52 @@
-#RecyclerView Kotlin
+Android RecyclerView Sample (Kotlin)
+====================================
 
 This application implements a RecyclerView in Kotlin with ListAdapter, onClickListener 
 and Headers. If you are looking for a simpler sample, look at the RecyclerViewSimple sample
-in the directory.
+in the directory.
+
+
+Introduction
+------------
+
+Sample demonstrating the use of [RecyclerView][1] to layout elements with a
+[LinearLayoutManager][2].
+
+[RecyclerView][1] can display large datasets that can be scrolled
+efficiently by recycling a limited number of views. [ListAdapter][3] is used to 
+efficiently compute diffs when items are added/removed from the list. Click listeners can be
+defined when [ViewHolder][4] views are instantiated. 
+
+
+[1]: https://developer.android.com/reference/kotlin/androidx/recyclerview/widget/RecyclerView
+[2]: https://developer.android.com/reference/androidx/recyclerview/widget/LinearLayoutManager
+[3]: https://developer.android.com/reference/androidx/recyclerview/widget/ListAdapter
+[4]: https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.ViewHolder
+
+Pre-requisites
+--------------
+
+- Android SDK 27
+- Android Gradle Plugin 3.0
+- Android Support Repository
+
+Screenshots
+-------------
+
+![image](https://user-images.githubusercontent.com/46006059/98028846-8b6df700-1dc3-11eb-9f0b-ad93569be189.png)
+
+Getting Started
+---------------
+
+To build this project, use "Import Project" in Android Studio.
+
+Support
+-------
+
+- Stack Overflow: http://stackoverflow.com/questions/tagged/android
+
+If you've found an error in this sample, please file an issue:
+https://github.com/android/views-widgets
+
+Patches are encouraged, and may be submitted by forking this project and
+submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.

RecyclerViewKotlin/app/build.gradle

@@ -20,7 +20,6 @@ apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion 30
-    buildToolsVersion "29.0.3"
 
     defaultConfig {
         applicationId "com.example.recyclersample"

RecyclerViewKotlin/app/src/main/java/com/example/recyclersample/flowerList/FlowersListActivity.kt

@@ -69,7 +69,7 @@ class FlowersListActivity : AppCompatActivity() {
     private fun adapterOnClick(flower: Flower) {
         val intent = Intent(this, FlowerDetailActivity()::class.java)
         intent.putExtra(FLOWER_ID, flower.id)
-        this.startActivity(intent)
+        startActivity(intent)
     }
 
     /* Adds flower to flowerList when FAB is clicked. */

RecyclerViewKotlin/app/src/main/java/com/example/recyclersample/flowerList/FlowersListViewModel.kt

@@ -29,7 +29,7 @@ class FlowersListViewModel(val dataSource: DataSource) : ViewModel() {
 
     /* If the name and description are present, create new Flower and add it to the datasource */
     fun insertFlower(flowerName: String?, flowerDescription: String?) {
-        if(flowerName == null || flowerDescription == null){
+        if (flowerName == null || flowerDescription == null) {
             return
         }
 

RecyclerViewKotlin/app/src/main/res/drawable/ic_add_black_24dp.xml

@@ -1,3 +1,15 @@
+<!--
+     Copyright (C) 2020 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.
+-->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
         android:width="24dp"
         android:height="24dp"

RecyclerViewKotlin/app/src/main/res/layout/activity_main.xml

@@ -30,10 +30,6 @@
         android:contentDescription="@string/fab_content_description"
         android:src="@drawable/ic_add_black_24dp"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.9"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.9" />
+        app:layout_constraintEnd_toEndOf="parent"/>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

RecyclerViewKotlin/app/src/main/res/layout/add_flower_layout.xml

@@ -63,7 +63,7 @@
     <Button
         android:id="@+id/done_button"
         style="?attr/materialButtonOutlinedStyle"
-        android:layout_width="250dp"
+        android:layout_width="240dp"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:text="@string/done_button_text" />

RecyclerViewKotlin/app/src/main/res/layout/flower_detail_activity.xml

@@ -22,16 +22,16 @@
         android:id="@+id/flower_detail_name"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingTop="50dp"
-        android:paddingBottom="20dp"
+        android:paddingTop="24dp"
+        android:paddingBottom="24dp"
         android:text="@string/flower1_name"
         android:textAlignment="center"
         android:textAppearance="?attr/textAppearanceHeadline3" />
 
     <ImageView
         android:id="@+id/flower_detail_image"
-        android:layout_width="300dp"
-        android:layout_height="300dp"
+        android:layout_width="320dp"
+        android:layout_height="320dp"
         android:layout_gravity="center"
         android:contentDescription="@string/flower_image_content_description"
         app:srcCompat="@drawable/rose" />
@@ -40,13 +40,13 @@
         android:id="@+id/flower_detail_description"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:padding="20dp"
+        android:padding="16dp"
         android:text="@string/flower1_description" />
 
     <Button
         android:id="@+id/remove_button"
         style="?attr/materialButtonOutlinedStyle"
-        android:layout_width="250dp"
+        android:layout_width="240dp"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:text="@string/remove_this_flower" />

RecyclerViewKotlin/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,4 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2020 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.
+-->
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />