For #139 - Adds session placeholder with motionlayout

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -4,15 +4,24 @@
 
 package org.mozilla.fenix.home
 
+import android.content.Context
+import android.os.Build
 import android.os.Bundle
 import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.TextView
+import androidx.annotation.RequiresApi
 import androidx.core.content.ContextCompat
+import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.fragment_home.*
 
 import org.mozilla.fenix.R
+import android.widget.RelativeLayout
+import android.graphics.Color
+import androidx.recyclerview.widget.LinearLayoutManager
+
 
 class HomeFragment : Fragment() {
     override fun onCreateView(
@@ -22,15 +31,26 @@ class HomeFragment : Fragment() {
         return inflater.inflate(R.layout.fragment_home, container, false)
     }
 
+    private lateinit var sessionsAdapter: SessionsAdapter
+
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+
+        sessionsAdapter = SessionsAdapter(requireContext())
+
         toolbar_wrapper.clipToOutline = false
         toolbar.apply {
             textColor = ContextCompat.getColor(context, R.color.searchText)
             textSize = 14f
-            hint = "Search the Web or enter address"
+            hint = context.getString(R.string.search_hint)
             hintColor = ContextCompat.getColor(context, R.color.searchText)
         }
+
+        session_list.apply {
+            adapter = sessionsAdapter
+            layoutManager = LinearLayoutManager(requireContext())
+            setHasFixedSize(true)
+        }
     }
 
 
@@ -38,3 +58,28 @@ class HomeFragment : Fragment() {
         fun create() = HomeFragment()
     }
 }
+
+// Temporary adapter
+private class SessionsAdapter(val context: Context) : RecyclerView.Adapter<SessionsAdapter.ViewHolder>() {
+    class ViewHolder(val textView: TextView) : RecyclerView.ViewHolder(textView) {}
+
+    @RequiresApi(Build.VERSION_CODES.M)
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val textView = TextView(context).apply {
+            val lp = RelativeLayout.LayoutParams(
+                RelativeLayout.LayoutParams.WRAP_CONTENT, // Width of TextView
+                RelativeLayout.LayoutParams.WRAP_CONTENT
+            )
+            setLayoutParams(lp)
+            setText("This is a sample TextView...")
+            setTextColor(Color.parseColor("#ff0000"))
+        }
+        return ViewHolder(textView)
+    }
+
+    override fun getItemCount(): Int = 0
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.textView.text = "Cell: ${position}"
+    }
+}

app/src/main/res/layout/fragment_home.xml

@@ -2,12 +2,14 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<androidx.constraintlayout.widget.ConstraintLayout
+<androidx.constraintlayout.motion.widget.MotionLayout
         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/homeLayout"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        app:layoutDescription="@xml/home_scene"
         tools:context=".home.HomeFragment"
         android:clipToPadding="false">
 
@@ -17,6 +19,7 @@
             android:src="@drawable/ic_menu"
             android:layout_width="48dp"
             android:layout_height="48dp"
+            android:layout_marginTop="16dp"
             android:background="?android:attr/selectableItemBackgroundBorderless"
             app:layout_constraintRight_toRightOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
@@ -64,4 +67,14 @@
 
     </FrameLayout>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+    <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/session_list"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_margin="16dp"
+            app:layout_constraintTop_toBottomOf="@id/toolbar_wrapper"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent"/>
+
+</androidx.constraintlayout.motion.widget.MotionLayout>

app/src/main/res/values/strings.xml

@@ -3,4 +3,5 @@
 
     <!-- TODO: Remove or change this placeholder text -->
     <string name="hello_blank_fragment">Hello blank fragment</string>
+    <string name="search_hint">Search the Web or enter address</string>
 </resources>

app/src/main/res/xml/home_scene.xml

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<MotionScene
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:motion="http://schemas.android.com/apk/res-auto">
+
+    <Transition
+        motion:constraintSetStart="@+id/start"
+        motion:constraintSetEnd="@+id/end">
+        <OnSwipe
+                motion:dragDirection="dragUp"
+                motion:touchAnchorId="@id/session_list"
+                motion:touchAnchorSide="top" />
+
+    </Transition>
+
+    <ConstraintSet android:id="@+id/start">
+
+    </ConstraintSet>
+
+    <ConstraintSet android:id="@+id/end">
+        <Constraint
+                android:id="@+id/wordmark"
+                android:layout_marginLeft="16dp"
+                android:layout_marginTop="12dp"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                motion:layout_constraintLeft_toLeftOf="parent"
+                motion:layout_constraintTop_toTopOf="parent" />
+
+        <Constraint
+            android:id="@+id/toolbar_wrapper"
+            android:layout_marginTop="16dp"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginLeft="16dp"
+            android:layout_marginRight="16dp"
+            motion:layout_constraintTop_toBottomOf="@id/wordmark"
+            motion:layout_constraintLeft_toLeftOf="parent"
+            motion:layout_constraintRight_toRightOf="parent"
+            android:elevation="0dp"/>
+    </ConstraintSet>
+
+</MotionScene>

buildSrc/src/main/java/Dependencies.kt

@@ -8,7 +8,7 @@ private object Versions {
     const val geckoNightly = "66.0.20181217093726"
 
     const val androidx_appcompat = "1.0.2"
-    const val androidx_constraint_layout = "1.1.3"
+    const val androidx_constraint_layout = "2.0.0-alpha3"
 
     const val mozilla_android_components = "0.37.0"