From 36ca49b3c66102b7cb79beba602e78e30303910e Mon Sep 17 00:00:00 2001
From: hyngav <125797874+hyngav@users.noreply.github.com>
Date: Tue, 2 Apr 2024 15:45:51 +0800
Subject: [PATCH 1/5] first commit

---
 .idea/deploymentTargetDropDown.xml        | 10 +++++
 .idea/gradle.xml                          |  1 +
 .idea/kotlinc.xml                         |  6 +++
 .idea/misc.xml                            |  2 +-
 .idea/vcs.xml                             |  6 +++
 app/src/main/res/layout/activity_main.xml | 46 ++++++++++++++++++-----
 app/src/main/res/values-night/themes.xml  |  7 ----
 app/src/main/res/values/colors.xml        |  2 +
 app/src/main/res/values/themes.xml        |  6 +--
 9 files changed, 64 insertions(+), 22 deletions(-)
 create mode 100644 .idea/deploymentTargetDropDown.xml
 create mode 100644 .idea/kotlinc.xml
 create mode 100644 .idea/vcs.xml
 delete mode 100644 app/src/main/res/values-night/themes.xml

diff --git a/.idea/deploymentTargetDropDown.xml b/.idea/deploymentTargetDropDown.xml
new file mode 100644
index 0000000..0c0c338
--- /dev/null
+++ b/.idea/deploymentTargetDropDown.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetDropDown">
+    <value>
+      <entry key="app">
+        <State />
+      </entry>
+    </value>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 32522c1..0897082 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
new file mode 100644
index 0000000..8d81632
--- /dev/null
+++ b/.idea/kotlinc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="KotlinJpsPluginSettings">
+    <option name="version" value="1.9.22" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 6ba4969..0ad17cb 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..668ca30 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,18 +1,46 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
+    <LinearLayout
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        android:orientation="horizontal"
+        android:layout_marginBottom="20dp"
+        android:layout_marginTop="20dp">
+        <Button
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:text="<-"
+            android:textColor="@color/blue"
+            android:background="@null"
+            android:textStyle="bold"
+            android:textSize="20sp"/>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
+        <Button
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"
+            android:text="->"
+            android:textColor="@color/blue"
+            android:background="@null"
+            android:textStyle="bold"
+            android:textSize="20sp"/>
+
+        <TextView
+            android:layout_width="0dp"
+            android:layout_weight="2"
+            android:layout_height="wrap_content"
+            android:text="Hello World!"
+            android:textSize="20sp" />
+            
+
+    </LinearLayout>
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
deleted file mode 100644
index b1500dd..0000000
--- a/app/src/main/res/values-night/themes.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<resources xmlns:tools="http://schemas.android.com/tools">
-    <!-- Base application theme. -->
-    <style name="Base.Theme.SharedCalendar" parent="Theme.Material3.DayNight.NoActionBar">
-        <!-- Customize your dark theme here. -->
-        <!-- <item name="colorPrimary">@color/my_dark_primary</item> -->
-    </style>
-</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index c8524cd..600f8f7 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <color name="black">#FF000000</color>
+    <color name="gray">#888</color>
+    <color name="blue">#0000FF</color>
     <color name="white">#FFFFFFFF</color>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 34d17e3..003b02f 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,9 +1,5 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
-    <style name="Base.Theme.SharedCalendar" parent="Theme.Material3.DayNight.NoActionBar">
-        <!-- Customize your light theme here. -->
-        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
+    <style name="Base.Theme.SharedCalendar" parent="Theme.AppCompat.Light.NoActionBar">
     </style>
-
-    <style name="Theme.SharedCalendar" parent="Base.Theme.SharedCalendar" />
 </resources>
\ No newline at end of file

From 6e81f7adc84da5b44a3e76bd0df149af66abe748 Mon Sep 17 00:00:00 2001
From: hyngav <125797874+hyngav@users.noreply.github.com>
Date: Sun, 7 Apr 2024 12:44:50 +0800
Subject: [PATCH 2/5] built monthly view

---
 .idea/misc.xml                                |   1 -
 app/src/main/AndroidManifest.xml              |   2 +-
 .../example/sharedcalendar/CalendarAdapter.kt |  33 ++++++
 .../sharedcalendar/CalendarViewHolder.kt      |  22 ++++
 .../example/sharedcalendar/MainActivity.kt    |  72 +++++++++++-
 app/src/main/res/layout/activity_main.xml     | 107 +++++++++++++++---
 app/src/main/res/layout/calendar_cell.xml     |  20 ++++
 7 files changed, 240 insertions(+), 17 deletions(-)
 create mode 100644 app/src/main/java/com/example/sharedcalendar/CalendarAdapter.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/CalendarViewHolder.kt
 create mode 100644 app/src/main/res/layout/calendar_cell.xml

diff --git a/.idea/misc.xml b/.idea/misc.xml
index 0ad17cb..8978d23 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fb0e0df..dbbcefd 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -10,7 +10,7 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.SharedCalendar"
+        android:theme="@style/Theme.AppCompat.Light.NoActionBar"
         tools:targetApi="31">
         <activity
             android:name=".MainActivity"
diff --git a/app/src/main/java/com/example/sharedcalendar/CalendarAdapter.kt b/app/src/main/java/com/example/sharedcalendar/CalendarAdapter.kt
new file mode 100644
index 0000000..53db870
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/CalendarAdapter.kt
@@ -0,0 +1,33 @@
+package com.example.sharedcalendar
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+
+class CalendarAdapter(
+    private val daysOfMonth: ArrayList<String>,
+    private val onItemListener: OnItemListener
+) :
+    RecyclerView.Adapter<CalendarViewHolder>() {
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CalendarViewHolder {
+        val inflater = LayoutInflater.from(parent.context)
+        val view: View = inflater.inflate(R.layout.calendar_cell,parent,false)
+        val layoutParams = view.layoutParams
+        layoutParams.height = (parent.height * 0.166666666).toInt()
+        return CalendarViewHolder(view, onItemListener)
+    }
+
+    override fun onBindViewHolder(holder: CalendarViewHolder, position: Int) {
+        holder.dayOfMonth.text = daysOfMonth[position]
+    }
+
+    override fun getItemCount(): Int {
+        return daysOfMonth.size
+    }
+
+    interface OnItemListener {
+        fun onItemClick(position: Int, dayText: String?)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/CalendarViewHolder.kt b/app/src/main/java/com/example/sharedcalendar/CalendarViewHolder.kt
new file mode 100644
index 0000000..6bd4f0b
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/CalendarViewHolder.kt
@@ -0,0 +1,22 @@
+package com.example.sharedcalendar
+
+import android.view.View
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+
+
+class CalendarViewHolder(itemView: View, onItemListener: CalendarAdapter.OnItemListener) :
+    RecyclerView.ViewHolder(itemView), View.OnClickListener {
+    val dayOfMonth: TextView
+    private val onItemListener: CalendarAdapter.OnItemListener
+
+    init {
+        dayOfMonth = itemView.findViewById<TextView>(R.id.cellDayText)
+        this.onItemListener = onItemListener
+        itemView.setOnClickListener(this)
+    }
+
+    override fun onClick(view: View) {
+        onItemListener.onItemClick(adapterPosition, dayOfMonth.text as String)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/MainActivity.kt b/app/src/main/java/com/example/sharedcalendar/MainActivity.kt
index 3331669..13167d9 100644
--- a/app/src/main/java/com/example/sharedcalendar/MainActivity.kt
+++ b/app/src/main/java/com/example/sharedcalendar/MainActivity.kt
@@ -1,11 +1,79 @@
 package com.example.sharedcalendar
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.view.View
+import android.widget.TextView
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.example.sharedcalendar.CalendarAdapter.OnItemListener
+import java.time.LocalDate
+import java.time.YearMonth
+import java.time.format.DateTimeFormatter
+
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), OnItemListener {
+    private var monthYearText: TextView? = null
+    private var calendarRecyclerView: RecyclerView? = null
+    private var selectedDate: LocalDate? = null
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        initWidgets()
+        selectedDate = LocalDate.now()
+        setMonthView()
+    }
+
+    private fun initWidgets() {
+        calendarRecyclerView = findViewById<RecyclerView>(R.id.calendarRecyclerView)
+        monthYearText = findViewById<TextView>(R.id.monthViewTV)
+    }
+
+    private fun setMonthView() {
+        monthYearText!!.text = monthYearFromDate(selectedDate)
+        val daysInMonth = daysInMonthArray(selectedDate)
+        val calendarAdapter = CalendarAdapter(daysInMonth, this)
+        val layoutManager: RecyclerView.LayoutManager = GridLayoutManager(applicationContext, 7)
+        calendarRecyclerView!!.layoutManager = layoutManager
+        calendarRecyclerView!!.adapter = calendarAdapter
+    }
+
+    private fun daysInMonthArray(date: LocalDate?): ArrayList<String> {
+        val daysInMonthArray = ArrayList<String>()
+        val yearMonth = YearMonth.from(date)
+        val daysInMonth = yearMonth.lengthOfMonth()
+        val firstOfMonth = selectedDate!!.withDayOfMonth(1)
+        val dayOfWeek = firstOfMonth.dayOfWeek.value
+        for (i in 1..42) {
+            if (i <= dayOfWeek || i > daysInMonth + dayOfWeek) {
+                daysInMonthArray.add("")
+            } else {
+                daysInMonthArray.add((i - dayOfWeek).toString())
+            }
+        }
+        return daysInMonthArray
+    }
+
+    private fun monthYearFromDate(date: LocalDate?): String {
+        val formatter = DateTimeFormatter.ofPattern("MMMM yyyy")
+        return date!!.format(formatter)
+    }
+
+    fun previousMonthAction(view: View?) {
+        selectedDate = selectedDate!!.minusMonths(1)
+        setMonthView()
+    }
+
+    fun nextMonthAction(view: View?) {
+        selectedDate = selectedDate!!.plusMonths(1)
+        setMonthView()
+    }
+
+    override fun onItemClick(position: Int, dayText: String?) {
+        if (dayText != "") {
+            val message = "Selected Date " + dayText + " " + monthYearFromDate(selectedDate)
+            Toast.makeText(this, message, Toast.LENGTH_LONG).show()
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 668ca30..831efb3 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -14,33 +14,114 @@
         android:orientation="horizontal"
         android:layout_marginBottom="20dp"
         android:layout_marginTop="20dp">
+
         <Button
             android:layout_width="0dp"
-            android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:text="<-"
-            android:textColor="@color/blue"
+            android:layout_weight="1"
             android:background="@null"
+            android:onClick="previousMonthAction"
+            android:text="《-"
+            android:textAlignment="center"
+            android:textColor="@color/blue"
+            android:textSize="20sp"
             android:textStyle="bold"
-            android:textSize="20sp"/>
+            tools:ignore="TouchTargetSizeCheck" />
+        <TextView
+            android:id="@+id/monthViewTV"
+            android:layout_width="0dp"
+            android:layout_weight="2"
+            android:layout_height="wrap_content"
+            android:text="Hello World!"
+            android:textAlignment="center"
+            android:textSize="20sp" />
 
         <Button
             android:layout_width="0dp"
-            android:layout_weight="1"
             android:layout_height="wrap_content"
-            android:text="->"
-            android:textColor="@color/blue"
+            android:layout_weight="1"
             android:background="@null"
+            android:onClick="nextMonthAction"
+            android:text="-》"
+            android:textAlignment="center"
+            android:textColor="@color/blue"
+            android:textSize="20sp"
             android:textStyle="bold"
-            android:textSize="20sp"/>
-
+            tools:ignore="TouchTargetSizeCheck" />
+    </LinearLayout>
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
         <TextView
             android:layout_width="0dp"
-            android:layout_weight="2"
             android:layout_height="wrap_content"
-            android:text="Hello World!"
-            android:textSize="20sp" />
-            
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="SUN"
+            android:layout_weight="1"
+        />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="MON"
+            android:layout_weight="1"
+            />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="TUE"
+            android:layout_weight="1"
+            />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="WED"
+            android:layout_weight="1"
+            />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="THUR"
+            android:layout_weight="1"
+            />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="FRI"
+            android:layout_weight="1"
+            />
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textColor="@color/gray"
+            android:textAlignment="center"
+            android:textSize="16sp"
+            android:text="SAT"
+            android:layout_weight="1"
+            />
+
 
     </LinearLayout>
+    <androidx.recyclerview.widget.RecyclerView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:id="@+id/calendarRecyclerView"/>
+
 </LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/calendar_cell.xml b/app/src/main/res/layout/calendar_cell.xml
new file mode 100644
index 0000000..7845ea3
--- /dev/null
+++ b/app/src/main/res/layout/calendar_cell.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="1"
+        android:textSize="20sp"
+        android:textColor="@color/black"
+        android:id="@+id/cellDayText"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintVertical_bias="0.25"
+        />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

From b39d89b9f38af7db84fbe313ab1128f8ab2ec10a Mon Sep 17 00:00:00 2001
From: Jasmine Yeung <jasmine.yyyeung@gmail.com>
Date: Sat, 13 Apr 2024 16:34:21 +0800
Subject: [PATCH 3/5] Update .gitignore

---
 .gitignore | 79 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 66 insertions(+), 13 deletions(-)

diff --git a/.gitignore b/.gitignore
index aa724b7..821460d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,15 +1,68 @@
+# Gradle files
+.gradle/
+build/
+
+# Log/OS Files
+*.log
+
+# Android Studio generated files and folders
+captures/
+.externalNativeBuild/
+.cxx/
+*.apk
+output.json
+
+# IntelliJ
 *.iml
-.gradle
-/local.properties
-/.idea/caches
-/.idea/libraries
-/.idea/modules.xml
-/.idea/workspace.xml
-/.idea/navEditor.xml
-/.idea/assetWizardSettings.xml
-.DS_Store
-/build
-/captures
-.externalNativeBuild
-.cxx
+.idea/
+misc.xml
+deploymentTargetDropDown.xml
+render.experimental.xml
+
+# Keystore files
+*.jks
+*.keystore
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Android Profiling
+*.hprof
+
+# Built application files
+/*/build/
+
+# Crashlytics configuations
+com_crashlytics_export_strings.xml
+
+# Local configuration file (sdk path, etc)
 local.properties
+
+# Signing files
+.signing/
+
+# User-specific configurations
+.idea/libraries/
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/.name
+.idea/compiler.xml
+.idea/copyright/profiles_settings.xml
+.idea/encodings.xml
+.idea/misc.xml
+.idea/modules.xml
+.idea/scopes/scope_settings.xml
+.idea/vcs.xml
+.idea/assetWizardSettings.xml
+.idea/caches
+#*.iml
+
+# OS-specific files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+/.idea/

From 3c5156fb487813ba130652e5e833588455ca677f Mon Sep 17 00:00:00 2001
From: Jasmine Yeung <jasmine.yyyeung@gmail.com>
Date: Sat, 13 Apr 2024 16:40:43 +0800
Subject: [PATCH 4/5] Update min SDK from 24 to 26

---
 app/build.gradle.kts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index a69ed63..17ef710 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -9,7 +9,7 @@ android {
 
     defaultConfig {
         applicationId = "com.example.sharedcalendar"
-        minSdk = 24
+        minSdk = 26
         targetSdk = 34
         versionCode = 1
         versionName = "1.0"

From 3477919eed24c74249c59599f9d802de8ed60541 Mon Sep 17 00:00:00 2001
From: Jasmine Yeung <jasmine.yyyeung@gmail.com>
Date: Sun, 14 Apr 2024 21:49:05 +0800
Subject: [PATCH 5/5] Added Login Page

---
 app/build.gradle.kts                          |   6 +
 app/src/main/AndroidManifest.xml              |   4 +
 .../example/sharedcalendar/MainActivity.kt    |  12 ++
 .../sharedcalendar/data/LoginDataSource.kt    |  29 ++++
 .../sharedcalendar/data/LoginRepository.kt    |  47 +++++++
 .../com/example/sharedcalendar/data/Result.kt |  18 +++
 .../sharedcalendar/data/model/LoggedInUser.kt |   9 ++
 .../ui/login/LoggedInUserView.kt              |   9 ++
 .../sharedcalendar/ui/login/LoginActivity.kt  | 130 ++++++++++++++++++
 .../sharedcalendar/ui/login/LoginFormState.kt |  10 ++
 .../sharedcalendar/ui/login/LoginResult.kt    |   9 ++
 .../sharedcalendar/ui/login/LoginViewModel.kt |  55 ++++++++
 .../ui/login/LoginViewModelFactory.kt         |  25 ++++
 .../res/layout-w1240dp/activity_login.xml     |  71 ++++++++++
 .../main/res/layout-w936dp/activity_login.xml |  78 +++++++++++
 app/src/main/res/layout/activity_login.xml    |  71 ++++++++++
 app/src/main/res/values-land/dimens.xml       |   3 +
 app/src/main/res/values-w1240dp/dimens.xml    |   3 +
 app/src/main/res/values-w600dp/dimens.xml     |   3 +
 app/src/main/res/values/dimens.xml            |   5 +
 app/src/main/res/values/strings.xml           |   9 ++
 21 files changed, 606 insertions(+)
 create mode 100644 app/src/main/java/com/example/sharedcalendar/data/LoginDataSource.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/data/LoginRepository.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/data/Result.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/data/model/LoggedInUser.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/ui/login/LoggedInUserView.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/ui/login/LoginActivity.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/ui/login/LoginFormState.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/ui/login/LoginResult.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModel.kt
 create mode 100644 app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModelFactory.kt
 create mode 100644 app/src/main/res/layout-w1240dp/activity_login.xml
 create mode 100644 app/src/main/res/layout-w936dp/activity_login.xml
 create mode 100644 app/src/main/res/layout/activity_login.xml
 create mode 100644 app/src/main/res/values-land/dimens.xml
 create mode 100644 app/src/main/res/values-w1240dp/dimens.xml
 create mode 100644 app/src/main/res/values-w600dp/dimens.xml
 create mode 100644 app/src/main/res/values/dimens.xml

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 17ef710..06c3c24 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -33,6 +33,9 @@ android {
     kotlinOptions {
         jvmTarget = "1.8"
     }
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 dependencies {
@@ -41,6 +44,9 @@ dependencies {
     implementation("androidx.appcompat:appcompat:1.6.1")
     implementation("com.google.android.material:material:1.11.0")
     implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    implementation("androidx.annotation:annotation:1.6.0")
+    implementation("androidx.lifecycle:lifecycle-livedata-ktx:2.6.1")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index dbbcefd..4d45236 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,6 +12,10 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.AppCompat.Light.NoActionBar"
         tools:targetApi="31">
+        <activity
+            android:name=".ui.login.LoginActivity"
+            android:exported="false"
+            android:label="@string/title_activity_login" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/com/example/sharedcalendar/MainActivity.kt b/app/src/main/java/com/example/sharedcalendar/MainActivity.kt
index 13167d9..63d404f 100644
--- a/app/src/main/java/com/example/sharedcalendar/MainActivity.kt
+++ b/app/src/main/java/com/example/sharedcalendar/MainActivity.kt
@@ -1,6 +1,8 @@
 package com.example.sharedcalendar
 
+import android.content.Intent
 import android.os.Bundle
+import android.util.Log
 import android.view.View
 import android.widget.TextView
 import android.widget.Toast
@@ -8,10 +10,14 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.example.sharedcalendar.CalendarAdapter.OnItemListener
+import com.example.sharedcalendar.data.LoginDataSource
+import com.example.sharedcalendar.data.LoginRepository
+import com.example.sharedcalendar.ui.login.LoginActivity
 import java.time.LocalDate
 import java.time.YearMonth
 import java.time.format.DateTimeFormatter
 
+const val TAG = "MainActivity"
 
 class MainActivity : AppCompatActivity(), OnItemListener {
     private var monthYearText: TextView? = null
@@ -23,6 +29,12 @@ class MainActivity : AppCompatActivity(), OnItemListener {
         initWidgets()
         selectedDate = LocalDate.now()
         setMonthView()
+
+        // Start Login Activity if not logged in
+        Log.i(TAG, LoginRepository(LoginDataSource()).isLoggedIn.toString())
+        if (!LoginRepository(LoginDataSource()).isLoggedIn) {
+            startActivity(Intent(this, LoginActivity::class.java))
+        }
     }
 
     private fun initWidgets() {
diff --git a/app/src/main/java/com/example/sharedcalendar/data/LoginDataSource.kt b/app/src/main/java/com/example/sharedcalendar/data/LoginDataSource.kt
new file mode 100644
index 0000000..663ccff
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/data/LoginDataSource.kt
@@ -0,0 +1,29 @@
+package com.example.sharedcalendar.data
+
+import android.util.Log
+import com.example.sharedcalendar.data.model.LoggedInUser
+import java.io.IOException
+
+const val TAG = "LoginDataSource"
+/**
+ * Class that handles authentication w/ login credentials and retrieves user information.
+ */
+class LoginDataSource {
+
+    fun login(username: String, password: String): Result<LoggedInUser> {
+        try {
+            Log.i(TAG, username)
+            Log.i(TAG, password)
+            // TODO: handle loggedInUser authentication
+
+            val fakeUser = LoggedInUser(java.util.UUID.randomUUID().toString(), "Jane Doe")
+            return Result.Success(fakeUser)
+        } catch (e: Throwable) {
+            return Result.Error(IOException("Error logging in", e))
+        }
+    }
+
+    fun logout() {
+        // TODO: revoke authentication
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/data/LoginRepository.kt b/app/src/main/java/com/example/sharedcalendar/data/LoginRepository.kt
new file mode 100644
index 0000000..c9e82f0
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/data/LoginRepository.kt
@@ -0,0 +1,47 @@
+package com.example.sharedcalendar.data
+
+import com.example.sharedcalendar.data.model.LoggedInUser
+
+/**
+ * Class that requests authentication and user information from the remote data source and
+ * maintains an in-memory cache of login status and user credentials information.
+ */
+
+class LoginRepository(val dataSource: LoginDataSource) {
+
+    // in-memory cache of the loggedInUser object
+    var user: LoggedInUser? = null
+        private set
+
+    val isLoggedIn: Boolean
+        get() = user != null
+
+    init {
+        // If user credentials will be cached in local storage, it is recommended it be encrypted
+        // @see https://developer.android.com/training/articles/keystore
+        user = null
+    }
+
+    fun logout() {
+        user = null
+        dataSource.logout()
+    }
+
+    fun login(username: String, password: String): Result<LoggedInUser> {
+        // handle login
+        val result = dataSource.login(username, password)
+
+        if (result is Result.Success) {
+            // If Login is successful
+            setLoggedInUser(result.data)
+        }
+
+        return result
+    }
+
+    private fun setLoggedInUser(loggedInUser: LoggedInUser) {
+        this.user = loggedInUser
+        // If user credentials will be cached in local storage, it is recommended it be encrypted
+        // @see https://developer.android.com/training/articles/keystore
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/data/Result.kt b/app/src/main/java/com/example/sharedcalendar/data/Result.kt
new file mode 100644
index 0000000..3c3559a
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/data/Result.kt
@@ -0,0 +1,18 @@
+package com.example.sharedcalendar.data
+
+/**
+ * A generic class that holds a value with its loading status.
+ * @param <T>
+ */
+sealed class Result<out T : Any> {
+
+    data class Success<out T : Any>(val data: T) : Result<T>()
+    data class Error(val exception: Exception) : Result<Nothing>()
+
+    override fun toString(): String {
+        return when (this) {
+            is Success<*> -> "Success[data=$data]"
+            is Error -> "Error[exception=$exception]"
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/data/model/LoggedInUser.kt b/app/src/main/java/com/example/sharedcalendar/data/model/LoggedInUser.kt
new file mode 100644
index 0000000..5b39c03
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/data/model/LoggedInUser.kt
@@ -0,0 +1,9 @@
+package com.example.sharedcalendar.data.model
+
+/**
+ * Data class that captures user information for logged in users retrieved from LoginRepository
+ */
+data class LoggedInUser(
+    val userId: String,
+    val displayName: String
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/ui/login/LoggedInUserView.kt b/app/src/main/java/com/example/sharedcalendar/ui/login/LoggedInUserView.kt
new file mode 100644
index 0000000..264a89e
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/ui/login/LoggedInUserView.kt
@@ -0,0 +1,9 @@
+package com.example.sharedcalendar.ui.login
+
+/**
+ * User details post authentication that is exposed to the UI
+ */
+data class LoggedInUserView(
+    val displayName: String
+    //... other data fields that may be accessible to the UI
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/ui/login/LoginActivity.kt b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginActivity.kt
new file mode 100644
index 0000000..cb9fa27
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginActivity.kt
@@ -0,0 +1,130 @@
+package com.example.sharedcalendar.ui.login
+
+import android.app.Activity
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProvider
+import android.os.Bundle
+import androidx.annotation.StringRes
+import androidx.appcompat.app.AppCompatActivity
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.View
+import android.view.inputmethod.EditorInfo
+import android.widget.EditText
+import android.widget.Toast
+import com.example.sharedcalendar.databinding.ActivityLoginBinding
+
+import com.example.sharedcalendar.R
+
+class LoginActivity : AppCompatActivity() {
+
+    private lateinit var loginViewModel: LoginViewModel
+    private lateinit var binding: ActivityLoginBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        binding = ActivityLoginBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        val username = binding.username
+        val password = binding.password
+        val login = binding.login
+        val loading = binding.loading
+
+        loginViewModel = ViewModelProvider(this, LoginViewModelFactory())
+            .get(LoginViewModel::class.java)
+
+        loginViewModel.loginFormState.observe(this@LoginActivity, Observer {
+            val loginState = it ?: return@Observer
+
+            // disable login button unless both username / password is valid
+            login.isEnabled = loginState.isDataValid
+
+            if (loginState.usernameError != null) {
+                username.error = getString(loginState.usernameError)
+            }
+            if (loginState.passwordError != null) {
+                password.error = getString(loginState.passwordError)
+            }
+        })
+
+        loginViewModel.loginResult.observe(this@LoginActivity, Observer {
+            val loginResult = it ?: return@Observer
+
+            loading.visibility = View.GONE
+            if (loginResult.error != null) {
+                showLoginFailed(loginResult.error)
+            }
+            if (loginResult.success != null) {
+                updateUiWithUser(loginResult.success)
+            }
+            setResult(Activity.RESULT_OK)
+
+            //Complete and destroy login activity once successful
+            finish()
+        })
+
+        username.afterTextChanged {
+            loginViewModel.loginDataChanged(
+                username.text.toString(),
+                password.text.toString()
+            )
+        }
+
+        password.apply {
+            afterTextChanged {
+                loginViewModel.loginDataChanged(
+                    username.text.toString(),
+                    password.text.toString()
+                )
+            }
+
+            setOnEditorActionListener { _, actionId, _ ->
+                when (actionId) {
+                    EditorInfo.IME_ACTION_DONE ->
+                        loginViewModel.login(
+                            username.text.toString(),
+                            password.text.toString()
+                        )
+                }
+                false
+            }
+
+            login.setOnClickListener {
+                loading.visibility = View.VISIBLE
+                loginViewModel.login(username.text.toString(), password.text.toString())
+            }
+        }
+    }
+
+    private fun updateUiWithUser(model: LoggedInUserView) {
+        val welcome = getString(R.string.welcome)
+        val displayName = model.displayName
+        // TODO : initiate successful logged in experience
+        Toast.makeText(
+            applicationContext,
+            "$welcome $displayName",
+            Toast.LENGTH_LONG
+        ).show()
+    }
+
+    private fun showLoginFailed(@StringRes errorString: Int) {
+        Toast.makeText(applicationContext, errorString, Toast.LENGTH_SHORT).show()
+    }
+}
+
+/**
+ * Extension function to simplify setting an afterTextChanged action to EditText components.
+ */
+fun EditText.afterTextChanged(afterTextChanged: (String) -> Unit) {
+    this.addTextChangedListener(object : TextWatcher {
+        override fun afterTextChanged(editable: Editable?) {
+            afterTextChanged.invoke(editable.toString())
+        }
+
+        override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
+
+        override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
+    })
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/ui/login/LoginFormState.kt b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginFormState.kt
new file mode 100644
index 0000000..fecb7a7
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginFormState.kt
@@ -0,0 +1,10 @@
+package com.example.sharedcalendar.ui.login
+
+/**
+ * Data validation state of the login form.
+ */
+data class LoginFormState(
+    val usernameError: Int? = null,
+    val passwordError: Int? = null,
+    val isDataValid: Boolean = false
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/ui/login/LoginResult.kt b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginResult.kt
new file mode 100644
index 0000000..87e5b39
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginResult.kt
@@ -0,0 +1,9 @@
+package com.example.sharedcalendar.ui.login
+
+/**
+ * Authentication result : success (user details) or error message.
+ */
+data class LoginResult(
+    val success: LoggedInUserView? = null,
+    val error: Int? = null
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModel.kt b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModel.kt
new file mode 100644
index 0000000..39bcdb7
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModel.kt
@@ -0,0 +1,55 @@
+package com.example.sharedcalendar.ui.login
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import android.util.Patterns
+import com.example.sharedcalendar.data.LoginRepository
+import com.example.sharedcalendar.data.Result
+
+import com.example.sharedcalendar.R
+
+class LoginViewModel(private val loginRepository: LoginRepository) : ViewModel() {
+
+    private val _loginForm = MutableLiveData<LoginFormState>()
+    val loginFormState: LiveData<LoginFormState> = _loginForm
+
+    private val _loginResult = MutableLiveData<LoginResult>()
+    val loginResult: LiveData<LoginResult> = _loginResult
+
+    fun login(username: String, password: String) {
+        // can be launched in a separate asynchronous job
+        val result = loginRepository.login(username, password)
+
+        if (result is Result.Success) {
+            _loginResult.value =
+                LoginResult(success = LoggedInUserView(displayName = result.data.displayName))
+        } else {
+            _loginResult.value = LoginResult(error = R.string.login_failed)
+        }
+    }
+
+    fun loginDataChanged(username: String, password: String) {
+        if (!isUserNameValid(username)) {
+            _loginForm.value = LoginFormState(usernameError = R.string.invalid_username)
+        } else if (!isPasswordValid(password)) {
+            _loginForm.value = LoginFormState(passwordError = R.string.invalid_password)
+        } else {
+            _loginForm.value = LoginFormState(isDataValid = true)
+        }
+    }
+
+    // A placeholder username validation check
+    private fun isUserNameValid(username: String): Boolean {
+        return if (username.contains('@')) {
+            Patterns.EMAIL_ADDRESS.matcher(username).matches()
+        } else {
+            username.isNotBlank()
+        }
+    }
+
+    // A placeholder password validation check
+    private fun isPasswordValid(password: String): Boolean {
+        return password.length > 5
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModelFactory.kt b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModelFactory.kt
new file mode 100644
index 0000000..15fce1e
--- /dev/null
+++ b/app/src/main/java/com/example/sharedcalendar/ui/login/LoginViewModelFactory.kt
@@ -0,0 +1,25 @@
+package com.example.sharedcalendar.ui.login
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.example.sharedcalendar.data.LoginDataSource
+import com.example.sharedcalendar.data.LoginRepository
+
+/**
+ * ViewModel provider factory to instantiate LoginViewModel.
+ * Required given LoginViewModel has a non-empty constructor
+ */
+class LoginViewModelFactory : ViewModelProvider.Factory {
+
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(LoginViewModel::class.java)) {
+            return LoginViewModel(
+                loginRepository = LoginRepository(
+                    dataSource = LoginDataSource()
+                )
+            ) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class")
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout-w1240dp/activity_login.xml b/app/src/main/res/layout-w1240dp/activity_login.xml
new file mode 100644
index 0000000..738fb65
--- /dev/null
+++ b/app/src/main/res/layout-w1240dp/activity_login.xml
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    tools:context=".ui.login.LoginActivity">
+
+    <EditText
+        android:id="@+id/username"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="96dp"
+        android:autofillHints="@string/prompt_email"
+        android:hint="@string/prompt_email"
+        android:inputType="textEmailAddress"
+        android:selectAllOnFocus="true"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <EditText
+        android:id="@+id/password"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:autofillHints="@string/prompt_password"
+        android:hint="@string/prompt_password"
+        android:imeActionLabel="@string/action_sign_in_short"
+        android:imeOptions="actionDone"
+        android:inputType="textPassword"
+        android:selectAllOnFocus="true"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/username" />
+
+    <Button
+        android:id="@+id/login"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="start"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="64dp"
+        android:enabled="false"
+        android:text="@string/action_sign_in"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/password"
+        app:layout_constraintVertical_bias="0.2" />
+
+    <ProgressBar
+        android:id="@+id/loading"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_marginTop="64dp"
+        android:layout_marginBottom="64dp"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@+id/password"
+        app:layout_constraintStart_toStartOf="@+id/password"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout-w936dp/activity_login.xml b/app/src/main/res/layout-w936dp/activity_login.xml
new file mode 100644
index 0000000..8e82562
--- /dev/null
+++ b/app/src/main/res/layout-w936dp/activity_login.xml
@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    tools:context=".ui.login.LoginActivity">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="840dp"
+        android:layout_height="match_parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent">
+
+        <EditText
+            android:id="@+id/username"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="96dp"
+            android:autofillHints="@string/prompt_email"
+            android:hint="@string/prompt_email"
+            android:inputType="textEmailAddress"
+            android:selectAllOnFocus="true"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <EditText
+            android:id="@+id/password"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:autofillHints="@string/prompt_password"
+            android:hint="@string/prompt_password"
+            android:imeActionLabel="@string/action_sign_in_short"
+            android:imeOptions="actionDone"
+            android:inputType="textPassword"
+            android:selectAllOnFocus="true"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/username" />
+
+        <Button
+            android:id="@+id/login"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="start"
+            android:layout_marginTop="16dp"
+            android:layout_marginBottom="64dp"
+            android:enabled="false"
+            android:text="@string/action_sign_in"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/password"
+            app:layout_constraintVertical_bias="0.2" />
+
+        <ProgressBar
+            android:id="@+id/loading"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:layout_marginTop="64dp"
+            android:layout_marginBottom="64dp"
+            android:visibility="gone"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="@+id/password"
+            app:layout_constraintStart_toStartOf="@+id/password"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintVertical_bias="0.3" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_login.xml b/app/src/main/res/layout/activity_login.xml
new file mode 100644
index 0000000..738fb65
--- /dev/null
+++ b/app/src/main/res/layout/activity_login.xml
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    tools:context=".ui.login.LoginActivity">
+
+    <EditText
+        android:id="@+id/username"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="96dp"
+        android:autofillHints="@string/prompt_email"
+        android:hint="@string/prompt_email"
+        android:inputType="textEmailAddress"
+        android:selectAllOnFocus="true"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <EditText
+        android:id="@+id/password"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:autofillHints="@string/prompt_password"
+        android:hint="@string/prompt_password"
+        android:imeActionLabel="@string/action_sign_in_short"
+        android:imeOptions="actionDone"
+        android:inputType="textPassword"
+        android:selectAllOnFocus="true"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/username" />
+
+    <Button
+        android:id="@+id/login"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="start"
+        android:layout_marginTop="16dp"
+        android:layout_marginBottom="64dp"
+        android:enabled="false"
+        android:text="@string/action_sign_in"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/password"
+        app:layout_constraintVertical_bias="0.2" />
+
+    <ProgressBar
+        android:id="@+id/loading"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_marginTop="64dp"
+        android:layout_marginBottom="64dp"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@+id/password"
+        app:layout_constraintStart_toStartOf="@+id/password"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-land/dimens.xml b/app/src/main/res/values-land/dimens.xml
new file mode 100644
index 0000000..5f681ae
--- /dev/null
+++ b/app/src/main/res/values-land/dimens.xml
@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="activity_horizontal_margin">48dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-w1240dp/dimens.xml b/app/src/main/res/values-w1240dp/dimens.xml
new file mode 100644
index 0000000..7e06511
--- /dev/null
+++ b/app/src/main/res/values-w1240dp/dimens.xml
@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="activity_horizontal_margin">200dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-w600dp/dimens.xml b/app/src/main/res/values-w600dp/dimens.xml
new file mode 100644
index 0000000..5f681ae
--- /dev/null
+++ b/app/src/main/res/values-w600dp/dimens.xml
@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="activity_horizontal_margin">48dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..e00c2dd
--- /dev/null
+++ b/app/src/main/res/values/dimens.xml
@@ -0,0 +1,5 @@
+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9676f7f..85f30df 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,12 @@
 <resources>
     <string name="app_name">Shared Calendar</string>
+    <string name="title_activity_login">LoginActivity</string>
+    <string name="prompt_email">Email</string>
+    <string name="prompt_password">Password</string>
+    <string name="action_sign_in">Sign in or register</string>
+    <string name="action_sign_in_short">Sign in</string>
+    <string name="welcome">"Welcome !"</string>
+    <string name="invalid_username">Not a valid username</string>
+    <string name="invalid_password">Password must be >5 characters</string>
+    <string name="login_failed">"Login failed"</string>
 </resources>
\ No newline at end of file