Starter

.gitignore

@@ -0,0 +1,42 @@
+*/.gitignore
+.gradle
+.DS_Store
+
+# built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+out/
+gen/
+
+# Libraries used by the app
+/libs
+
+# Build stuff (auto-generated by android update project ...)
+build.xml
+ant.properties
+local.properties
+project.properties
+
+# Eclipse project files
+.classpath
+.project
+
+# idea project files
+.idea/
+.idea/.name
+*.iml
+*.ipr
+*.iws
+
+# Gradle-based build
+build/
+

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

@@ -17,17 +17,15 @@ plugins {
     id 'com.android.application'
     id 'kotlin-android'
     id 'kotlin-kapt'
-    id 'androidx.navigation.safeargs.kotlin'
 }
 
 android {
-    compileSdkVersion 30
-    buildToolsVersion "30.0.2"
+    compileSdkVersion 33
 
     defaultConfig {
         applicationId "com.example.wordsapp"
         minSdkVersion 19
-        targetSdkVersion 30
+        targetSdkVersion 33
         versionCode 1
         versionName "1.0"
 
@@ -55,11 +53,8 @@ android {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation "androidx.core:core-ktx:$core_ktx_version"
     implementation "androidx.appcompat:appcompat:$appcompat_version"
     implementation "com.google.android.material:material:$material_version"
     implementation "androidx.constraintlayout:constraintlayout:$constraintlayout_version"
-    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
-    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
 }

app/src/main/AndroidManifest.xml

@@ -24,7 +24,11 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Words">
-        <activity android:name=".MainActivity">
+        <activity
+            android:name=".DetailActivity"
+            android:parentActivityName=".MainActivity" />
+        <activity android:name=".MainActivity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/com/example/wordsapp/DetailActivity.kt

@@ -0,0 +1,52 @@
+/*
+ * 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.
+ */
+package com.example.wordsapp
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.wordsapp.databinding.ActivityDetailBinding
+
+
+class DetailActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        // Retrieve a binding object that allows you to refer to views by id name
+        // Names are converted from snake case to camel case.
+        // For example, a View with the id word_one is referenced as binding.wordOne
+        val binding = ActivityDetailBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        // Retrieve the LETTER from the Intent extras
+        // intent.extras.getString returns String? (String or null)
+        // so toString() guarantees that the value will be a String
+        val letterId = "A"
+
+        val recyclerView = binding.recyclerView
+        recyclerView.layoutManager = LinearLayoutManager(this)
+        recyclerView.adapter = WordAdapter(letterId, this)
+
+        // Adds a [DividerItemDecoration] between items
+        recyclerView.addItemDecoration(
+            DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
+        )
+
+        title = getString(R.string.detail_prefix) + " " + letterId
+    }
+}

app/src/main/java/com/example/wordsapp/LetterAdapter.kt

@@ -22,7 +22,6 @@ import android.view.ViewGroup
 import android.view.accessibility.AccessibilityNodeInfo
 import android.widget.Button
 import androidx.annotation.RequiresApi
-import androidx.navigation.findNavController
 import androidx.recyclerview.widget.RecyclerView
 
 /**
@@ -50,9 +49,8 @@ class LetterAdapter :
      */
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): LetterViewHolder {
         val layout = LayoutInflater
-            .from(parent.context)
-            .inflate(R.layout.item_view, parent, false)
-
+                .from(parent.context)
+                .inflate(R.layout.item_view, parent, false)
         // Setup custom accessibility delegate to set the text read
         layout.accessibilityDelegate = Accessibility
         return LetterViewHolder(layout)
@@ -64,38 +62,28 @@ class LetterAdapter :
     override fun onBindViewHolder(holder: LetterViewHolder, position: Int) {
         val item = list.get(position)
         holder.button.text = item.toString()
-
-        // Assigns a [OnClickListener] to the button contained in the [ViewHolder]
-        holder.button.setOnClickListener {
-            // Create an action from WordList to DetailList
-            // using the required arguments
-            val action = WordListFragmentDirections
-                .actionWordListToDetailList(letter = holder.button.text.toString())
-            // Navigate using that action
-            holder.view.findNavController().navigate(action)
-        }
     }
 
     // Setup custom accessibility delegate to set the text read with
     // an accessibility service
     companion object Accessibility : View.AccessibilityDelegate() {
         @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
         override fun onInitializeAccessibilityNodeInfo(
-            host: View?,
-            info: AccessibilityNodeInfo?
+            host: View,
+            info: AccessibilityNodeInfo
         ) {
             super.onInitializeAccessibilityNodeInfo(host, info)
             // With `null` as the second argument to [AccessibilityAction], the
             // accessibility service announces "double tap to activate".
             // If a custom string is provided,
             // it announces "double tap to <custom string>".
-            val customString = host?.context?.getString(R.string.look_up_words)
+            val customString = host.context?.getString(R.string.look_up_words)
             val customClick =
                 AccessibilityNodeInfo.AccessibilityAction(
                     AccessibilityNodeInfo.ACTION_CLICK,
                     customString
                 )
-            info?.addAction(customClick)
+            info.addAction(customClick)
         }
     }
 }

app/src/main/java/com/example/wordsapp/MainActivity.kt

@@ -17,33 +17,26 @@ package com.example.wordsapp
 
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
-import androidx.navigation.NavController
-import androidx.navigation.fragment.NavHostFragment
-import androidx.navigation.ui.setupActionBarWithNavController
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.example.wordsapp.databinding.ActivityMainBinding
 
 /**
- * Main Activity and entry point for the app.
+ * Main Activity and entry point for the app. Displays a RecyclerView of letters.
  */
 class MainActivity : AppCompatActivity() {
-    private lateinit var navController: NavController
+    private lateinit var recyclerView: RecyclerView
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
 
-        // Get the navigation host fragment from this Activity
-        val navHostFragment = supportFragmentManager
-            .findFragmentById(R.id.nav_host_fragment) as NavHostFragment
-        // Instantiate the navController using the NavHostFragment
-        navController = navHostFragment.navController
-        // Make sure actions in the ActionBar get propagated to the NavController
-        setupActionBarWithNavController(navController)
-    }
+        val binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
 
-    /**
-     * Enables back button support. Simply navigates one element up on the stack.
-     */
-    override fun onSupportNavigateUp(): Boolean {
-        return navController.navigateUp() || super.onSupportNavigateUp()
+        recyclerView = binding.recyclerView
+        // Sets the LinearLayoutManager of the recyclerview
+        recyclerView.layoutManager = LinearLayoutManager(this)
+        recyclerView.adapter = LetterAdapter()
     }
+
 }