activity_main.xml
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/creatureRecyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>list_item_creature.xml
<?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"
android:layout_width="match_parent"
android:layout_height="@dimen/list_item_creature_height"
xmlns:tools="http://schemas.android.com/tools"
>
<ImageView
android:id="@+id/creatureImage"
android:layout_width="@dimen/list_item_creature_height"
android:layout_height="@dimen/list_item_creature_height"
android:layout_marginStart="@dimen/padding_standard"
android:contentDescription="@string/content_description_creature_image"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/thumbnail_creature_cat_derp" />
<TextView
android:id="@+id/fullNameText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/padding_half"
android:layout_marginEnd="@dimen/padding_standard"
android:layout_marginStart="@dimen/padding_standard"
android:layout_marginTop="@dimen/padding_half"
android:textColor="@android:color/black"
android:textSize="@dimen/creature_name_text"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="@+id/creatureImage"
app:layout_constraintTop_toTopOf="parent"
android:text="Full Name" />
</androidx.constraintlayout.widget.ConstraintLayout>ViewGroupExtentions.kt
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.annotation.LayoutRes
fun ViewGroup.inflate(@LayoutRes layoutRes: Int, attachToRoot: Boolean = false): View {
return LayoutInflater.from(context).inflate(layoutRes, this, attachToRoot)
}CreatureAdapter.kt
class CreatureAdapter(private val creatures: List<Creature>): RecyclerView.Adapter<CreatureAdapter.ViewHolder>() {
class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(parent.inflate(R.layout.list_item_creature))
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
}
override fun getItemCount() = creatures.count()
}AllFragment.kt
class AllFragment : Fragment() {
private val adapter = CreatureAdapter(CreatureStore.getCreatures())
companion object {
fun newInstance(): AllFragment {
return AllFragment()
}
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
return inflater.inflate(R.layout.fragment_all, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
creatureRecyclerView.layoutManager = LinearLayoutManager(activity)
creatureRecyclerView.adapter = adapter
}
}CreatureStore.kt
object CreatureStore {
private const val TAG = "CreatureStore"
private lateinit var creatures: List<Creature>
private lateinit var foods: List<Food>
fun loadCreatures(context: Context) {
val gson = Gson()
val json = loadJSONFromAsset("creatures.json", context)
val listType = object : TypeToken<List<Creature>>() {}.type
creatures = gson.fromJson(json, listType)
creatures
.filter { Favorites.isFavorite(it, context) }
.forEach { it.isFavorite = true }
Log.v(TAG, "Found ${creatures.size} creatures")
}
fun loadFoods(context: Context) {
val gson = Gson()
val json = loadJSONFromAsset("foods.json", context)
val listType = object : TypeToken<List<Food>>() {}.type
foods = gson.fromJson(json, listType)
Log.v(TAG, "Found ${foods.size} food items")
}
fun getCreatures() = creatures
fun getCreatureById(id: Int) = creatures.firstOrNull { it.id == id }
fun getFoodById(id: Int) = foods.firstOrNull { it.id == id }
private fun loadJSONFromAsset(filename: String, context: Context): String? {
var json: String? = null
try {
val inputStream = context.assets.open(filename)
val size = inputStream.available()
val buffer = ByteArray(size)
inputStream.read(buffer)
inputStream.close()
json = String(buffer)
} catch (ex: IOException) {
Log.e(TAG, "Error reading from $filename", ex)
}
return json
}
}
CreatureAdapter.kt
class ViewHolder(v: View) : RecyclerView.ViewHolder(v) {
private lateinit var creature: Creature
fun bind(creature: Creature) {
this.creature = creature
val context = itemView.context
itemView.creatureImage.setImageResource(context.resources.getIdentifier(creature.uri, null, context.packageName))
itemView.fullNameText.text = creature.fullName
}
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bind(creatures[position])
}
list_item_creature.xml
<?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:layout_width="match_parent"
android:layout_height="@dimen/list_item_creature_height">
<ImageView
android:id="@+id/creatureImage"
android:layout_width="@dimen/list_item_creature_height"
android:layout_height="@dimen/list_item_creature_height"
android:layout_marginStart="@dimen/padding_standard"
android:contentDescription="@string/content_description_creature_image"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/thumbnail_creature_cat_derp" />
<TextView
android:id="@+id/fullNameText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/padding_standard"
android:layout_marginTop="@dimen/padding_half"
android:layout_marginEnd="@dimen/padding_standard"
android:layout_marginBottom="@dimen/padding_half"
android:text="Full Name"
android:textColor="@android:color/black"
android:textSize="@dimen/creature_name_text"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintBottom_toTopOf="@id/nickname"
app:layout_constraintStart_toEndOf="@+id/creatureImage"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed" />
<TextView
android:id="@+id/nickname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/padding_standard"
android:layout_marginBottom="@dimen/padding_half"
android:text="Nick Name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="@id/creatureImage"
app:layout_constraintTop_toBottomOf="@id/fullNameText" />
</androidx.constraintlayout.widget.ConstraintLayout>CreatureAdapter.kt
fun bind(creature: Creature) {
this.creature = creature
val context = itemView.context
itemView.creatureImage.setImageResource(context.resources.getIdentifier(creature.uri, null, context.packageName))
itemView.fullNameText.text = creature.fullName
itemView.nickname.text = creature.nickname
}
CreatureActivity.kt
class CreatureActivity : AppCompatActivity() {
private lateinit var creature: Creature
companion object {
private const val EXTRA_CREATURE_ID = "EXTRA_CREATURE_ID"
fun newIntent(context: Context, creatureId: Int): Intent {
val intent = Intent(context, CreatureActivity::class.java)
intent.putExtra(EXTRA_CREATURE_ID, creatureId)
return intent
}
}
CreatureAdapter.kt
class ViewHolder(v: View) : View.OnClickListener, RecyclerView.ViewHolder(v) {
private lateinit var creature: Creature
init {
itemView.setOnClickListener(this)
}
fun bind(creature: Creature) {
this.creature = creature
val context = itemView.context
itemView.creatureImage.setImageResource(context.resources.getIdentifier(creature.uri, null, context.packageName))
itemView.fullNameText.text = creature.fullName
itemView.nickname.text = creature.nickname
}
override fun onClick(view: View?) {
view?.let {
val context = it.context
val intent = CreatureActivity.newIntent(context, creature.id)
context.startActivity(intent)
}
}
}
fragment_favorites.xml
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/favoritesRecyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>FavoritesFragment
class FavoritesFragment : Fragment() {
private val adapter = CreatureAdapter(mutableListOf())
companion object {
fun newInstance(): FavoritesFragment {
return FavoritesFragment()
}
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
favoritesRecyclerView.layoutManager = LinearLayoutManager(activity)
favoritesRecyclerView.adapter = adapter
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
return inflater.inflate(R.layout.fragment_favorites, container, false)
}
override fun onResume() {
super.onResume()
activity?.let {
CreatureStore.getFavoriteCreatures(it)?.let {
favorites ->
adapter.updateCreatures(favorites)
}
}
}CreatureAdapter
class CreatureAdapter(private val creatures: MutableList<Creature>): RecyclerView.Adapter<CreatureAdapter.ViewHolder>() {
fun updateCreatures(creatures: List<Creature>) {
this.creatures.clear()
this.creatures.addAll(creatures)
notifyDataSetChanged()
}
build.gradle
android {
compileSdkVersion 31
defaultConfig {
applicationId "com.raywenderlich.android.creatures"
minSdkVersion 21
targetSdkVersion 31
android {
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}gradle.properties(app)
distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zipbuild.gradle(Project)
kotlin_version = '1.6.0' <activity
android:name=".ui.SplashActivity"
android:theme="@style/SplashTheme"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>