Creación de DogListActivity.kt, DogAdapter.kt y DogListViewModel.kt

app/build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
+    id 'kotlin-kapt'
 }
 
 android {
@@ -15,7 +16,9 @@ android {
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
-
+    buildFeatures {
+        dataBinding true
+    }
     buildTypes {
         release {
             minifyEnabled false
@@ -33,10 +36,15 @@ android {
 
 dependencies {
 
-    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.core:core-ktx:1.8.0'
     implementation 'androidx.appcompat:appcompat:1.4.2'
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
+    implementation 'androidx.recyclerview:recyclerview-selection:1.1.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.0'
+    implementation 'androidx.activity:activity-ktx:1.5.0'
+
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

app/src/main/AndroidManifest.xml

@@ -14,13 +14,19 @@
         android:theme="@style/Theme.DogApp"
         tools:targetApi="31">
         <activity
-            android:name=".MainActivity"
-            android:exported="true">
+            android:name=".doglist.DogListActivity"
+            android:exported="true" >
             <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
+            <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
+        </activity>
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+
         </activity>
     </application>
 

app/src/main/java/com/example/dogapp/Dog.kt

@@ -0,0 +1,5 @@
+package com.example.dogapp
+
+data class Dog(val id: Long, val index:Int, val name: String, val type: String, val heigthFemale: Double,
+val heighMale:Double, val imageUrl: String, val lifeExpectancy: String, val temperament: String,
+val weightFemale: Double, val weighMale: Double)

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

@@ -7,5 +7,9 @@ class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+
+
     }
-}
+
+}

app/src/main/java/com/example/dogapp/doglist/DogAdapter.kt

@@ -0,0 +1,38 @@
+package com.example.dogapp.doglist
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.example.dogapp.Dog
+import com.example.dogapp.databinding.ActivityDogListBinding
+import com.example.dogapp.databinding.DogListItemBinding
+
+class DogAdapter:ListAdapter<Dog, DogAdapter.DogViewHolder>(DiffCallback) {
+
+    companion object DiffCallback : DiffUtil.ItemCallback<Dog>() {
+        override fun areItemsTheSame(oldItem: Dog, newItem: Dog): Boolean {
+            return oldItem.id == newItem.id
+        }
+
+        override fun areContentsTheSame(oldItem: Dog, newItem: Dog): Boolean {
+            return oldItem == newItem
+        }
+    }
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DogViewHolder {
+        val binding = DogListItemBinding.inflate(LayoutInflater.from(parent.context))
+        return DogViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: DogViewHolder, position: Int) {
+        val dog = getItem(position)
+        holder.bind(dog)
+    }
+    inner class DogViewHolder(private val binding: DogListItemBinding):RecyclerView.ViewHolder(binding.root){
+
+        fun bind(dog: Dog){
+            binding.dogName.text = dog.name
+        }
+    }
+}

app/src/main/java/com/example/dogapp/doglist/DogListActivity.kt

@@ -0,0 +1,28 @@
+package com.example.dogapp.doglist
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import androidx.activity.viewModels
+import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.dogapp.Dog
+import com.example.dogapp.databinding.ActivityDogListBinding
+
+class DogListActivity : AppCompatActivity() {
+    private val dogListViewModel: DogListViewModel by viewModels() //Alternativa de declarar un ViewModel(mucho mejor), gracias a cierta dependencia que tenemos en el gradle
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val binding = ActivityDogListBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        val recycler = binding.dogRecycler
+        recycler.layoutManager = LinearLayoutManager(this)
+        val adapter = DogAdapter()
+        recycler.adapter = adapter
+        dogListViewModel.dogList.observe(this, Observer {
+            adapter.submitList(it)
+        })
+
+    }
+
+
+}

app/src/main/java/com/example/dogapp/doglist/DogListViewModel.kt

@@ -0,0 +1,29 @@
+package com.example.dogapp.doglist
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.dogapp.Dog
+import kotlinx.coroutines.launch
+
+class DogListViewModel:ViewModel() {
+    /*
+    Declaraciones de LiveDatas
+     */
+    private val _dogList = MutableLiveData<List<Dog>>()
+    val dogList:LiveData<List<Dog>>
+        get() = _dogList
+
+    private val repository = DogRepository()    //Creacion de objeto repositorio
+
+    init {
+        downloadDogs()
+    }
+
+    private fun downloadDogs() {
+        viewModelScope.launch {
+            _dogList.value = repository.downloadDogs()
+        }
+    }
+}

app/src/main/java/com/example/dogapp/doglist/DogRepository.kt

@@ -0,0 +1,63 @@
+package com.example.dogapp.doglist
+
+import com.example.dogapp.Dog
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+class DogRepository {
+
+    suspend fun downloadDogs():List<Dog>{
+        return withContext(Dispatchers.IO){
+            getFakeDogs()
+
+        }
+    }
+
+    private fun getFakeDogs(): MutableList<Dog> {
+        //Creacion de lista de perros
+        val dogList = mutableListOf<Dog>()
+        dogList.add(
+            Dog(
+                1, 1, "Chihuahua", "Toy", 5.4,
+                6.7, "", "12 - 15", "", 10.5,
+                12.3
+            )
+        )
+        dogList.add(
+            Dog(
+                2, 1, "Labrador", "Toy", 5.4,
+                6.7, "", "12 - 15", "", 10.5,
+                12.3
+            )
+        )
+        dogList.add(
+            Dog(
+                3, 1, "Retriever", "Toy", 5.4,
+                6.7, "", "12 - 15", "", 10.5,
+                12.3
+            )
+        )
+        dogList.add(
+            Dog(
+                4, 1, "San Bernardo", "Toy", 5.4,
+                6.7, "", "12 - 15", "", 10.5,
+                12.3
+            )
+        )
+        dogList.add(
+            Dog(
+                5, 1, "Husky", "Toy", 5.4,
+                6.7, "", "12 - 15", "", 10.5,
+                12.3
+            )
+        )
+        dogList.add(
+            Dog(
+                6, 1, "Xoloscuincle", "Toy", 5.4,
+                6.7, "", "12 - 15", "", 10.5,
+                12.3
+            )
+        )
+        return dogList
+    }
+}

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

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout 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">
+
+    <data>
+
+    </data>
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/dogRecycler"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".doglist.DogListActivity">
+
+    </androidx.recyclerview.widget.RecyclerView>
+</layout>

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

@@ -1,18 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<layout 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="match_parent"
-    tools:context=".MainActivity">
+    xmlns:tools="http://schemas.android.com/tools">
 
-    <TextView
-        android:layout_width="wrap_content"
-        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" />
+    <data>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+    </data>
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".MainActivity">
+
+        <TextView
+            android:layout_width="wrap_content"
+            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" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</layout>

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

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android">
+
+
+        <TextView
+            android:id="@+id/dogName"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+        </TextView>
+
+
+</layout>