Generalidades

Android Kotlin usa la biblioteca Glide para acceder a las imágenes en la base de datos de la habitación. | Autor: Harshita Bambure | Octubre de 2021

Bambú Harshita

Muchas veces necesitamos usar la biblioteca deslizante para mostrar imágenes, por lo que hoy usaremos la base de datos de la sala para mostrar imágenes.

Así que comencemos con la parte de la dependencia, agregué algunas dependencias en el archivo build.Gradle (: app).

//glide
implementation 'com.github.bumptech.glide:glide:4.12.0'
kapt 'com.github.bumptech.glide:compiler:4.12.0'
implementation "androidx.activity:activity-ktx:1.3.1"

// Room components
implementation "androidx.room:room-ktx:2.3.0"
kapt "androidx.room:room-compiler:2.3.0"
androidTestImplementation "androidx.room:room-testing:2.3.0"

// Lifecycle components
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1"
implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.3.1"
implementation "androidx.lifecycle:lifecycle-common-java8:2.3.1"

// Kotlin components
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.5.31"
api "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.1"
api "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0"
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0'

//cardview
implementation "androidx.cardview:cardview:1.0.0"
//RecyclerView
implementation 'androidx.recyclerview:recyclerview:1.2.1'

También agregué algunos complementos en build.gradle (: aplicación)

plugins 
id 'com.android.application'
id 'kotlin-android'
id 'kotlin-android-extensions'
id 'kotlin-kapt'

Ahora necesitamos agregar permisos de Internet al archivo de manifiesto.

<uses-permission android:name="android.permission.INTERNET" />

Así que comencemos con la parte del diseño.

Sala de actividades.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="match_parent"
tools:context=".RoomActivity">

<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_design"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="15dp"
android:layout_marginEnd="15dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
tools:listitem="@layout/item_recycler" />

</androidx.constraintlayout.widget.ConstraintLayout>

Para el proyecto de vista de reciclador, creé otro archivo XML.

item_recycler.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView 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="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
app:cardCornerRadius="5dp"
app:cardElevation="5dp"
app:cardUseCompatPadding="true">
<!--margin start is used for starting margin in grid layout we don't need margin end-->
<LinearLayout
android:id="@+id/ll_design"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical"
android:padding="10dp">

<ImageView
android:id="@+id/iv_shopping"
android:layout_width="80dp"
android:layout_height="wrap_content"
/>

<TextView
android:id="@+id/tv_product"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:text="Bags"
android:textSize="16sp"
android:textStyle="bold" />

<TextView
android:id="@+id/tv_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="$ 30" />
</LinearLayout>

</androidx.cardview.widget.CardView>

Para la base de datos de la sala, necesitamos crear una clase de entidad.

usuario.Mil toneladas

package com.example.ecommerceapplication.roomdb

import androidx.room.ColumnInfo
import androidx.room.Entity
import androidx.room.PrimaryKey

@Entity
data class User(
@ColumnInfo(name = "product_name")val product_name:String,
@ColumnInfo(name = "price_name")val price_name:String,
@ColumnInfo(name = "photo_product")val photo_product:String,

)
@PrimaryKey(autoGenerate = true)var uid: Int? = null

Post-creaciónToneladaNecesitamos crear una clase de entidad para crear la clase DAO.

Usuario Road.kt

package com.example.ecommerceapplication.roomdb

import androidx.room.Dao
import androidx.room.Delete
import androidx.room.Insert
import androidx.room.Query

@Dao
interface UserDao
@Query("SELECT * FROM user")
fun getAllUsers(): List<User>

@Insert
fun insert(vararg user: User)

@Delete
fun delete(user:User)

@Query("DELETE FROM user")
fun deleteAll()

Después de crear la clase DAO, necesitamos crear una clase de base de datos.

Base de datos de usuario.kt

package com.example.ecommerceapplication.roomdb

import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase

@Database(entities = [User::class], version = 1)
abstract class UserDatabase : RoomDatabase() {

abstract fun UserDao(): UserDao //all your DAO will be added here companion object {

// Here we are creating singleton so it will give same object every time instead of creating new.
companion object{
@Volatile
private var INSTANCE: UserDatabase? = null
private val DB_NAME: String="RoomDatabase" //Name of your database

fun getDatabase(context: Context): UserDatabase?
if (INSTANCE == null)
synchronized(UserDatabase::class.java)
if (INSTANCE == null)
INSTANCE = Room.databaseBuilder(
context.getApplicationContext(),
UserDatabase::class.java, DB_NAME
).build()



return INSTANCE

}

}

Ahora estoy creando una clase de adaptador de reciclador para nuestra vista de reciclador.

RecyclerAdapter.kt

package com.example.ecommerceapplication.ui.adapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.ecommerceapplication.R
import com.example.ecommerceapplication.roomdb.User

class RecyclerAdapter() :
RecyclerView.Adapter<RecyclerAdapter.ViewHolder>()
var listitem = mutableListOf<User>()

override fun onCreateViewHolder(viewGroup: ViewGroup, i: Int): ViewHolder
val view = LayoutInflater.from(viewGroup.context)
.inflate(R.layout.item_recycler, viewGroup, false)

return ViewHolder(view)

override fun onBindViewHolder(viewHolder: ViewHolder, i: Int)
var data = listitem.get(i)
Glide.with(viewHolder.img_android.context)
.load(data.photo_product)
.into(viewHolder.img_android)

viewHolder.txt_product.text= data.product_name
viewHolder.txt_price.text= data.price_name

override fun getItemCount(): Int
return listitem.size

fun Updatedata(listData:List<User>)
listitem.clear()
listitem.addAll(listData)
notifyDataSetChanged()

class ViewHolder(view: View) : RecyclerView.ViewHolder(view)

var img_android: ImageView
var txt_price:TextView
var txt_product:TextView

init
img_android = view.findViewById<ImageView>(R.id.iv_shopping)
txt_product = view.findViewById<TextView>(R.id.tv_product)
txt_price = view.findViewById<TextView>(R.id.tv_price)


Ahora necesitamos codificar en la clase de actividad.

Actividad de la habitación.kt

package com.example.ecommerceapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.ecommerceapplication.roomdb.User
import com.example.ecommerceapplication.roomdb.UserDatabase
import com.example.ecommerceapplication.ui.adapter.RecyclerAdapter
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch

class RoomActivity : AppCompatActivity()
lateinit var db: UserDatabase
var recyclerView: RecyclerView? = null
var Manager: GridLayoutManager? = null
var adapter: RecyclerAdapter? = null
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_room)

recyclerView = findViewById<View>(R.id.rv_design) as RecyclerView
Manager = GridLayoutManager(this, 2)
recyclerView!!.layoutManager = Manager
adapter = RecyclerAdapter()
recyclerView!!.adapter = adapter

db = UserDatabase.getDatabase(this)!!

val user1 =
User("Pink Bag", "$20", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR0sGeKNQngI4Ou_4xoLkM8V_SEHnBZwYMshg&usqp=CAU")
val user2 =
User("Bag Black", "$30", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTlTwVdQhinpCJoJSq7ErtO8XSLZXKWX4FrNw&usqp=CAU")
val user3 =
User("Red Bag", "$10", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ4Q8UbOq6OZzvZBdtURmc3JC-7aQGqXnyWCg&usqp=CAU")
val user4 =
User("Bag Pink", "$15", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSJgLEJqFbZbUGqV23KY7XTXcxLpxBZhYs-2w&usqp=CAU")
val user5 =
User("New Bag", "$17", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRfTQwInYeHWNR-3Kwb1337U1GWItol1sI5Vw&usqp=CAU")
val user6 =
User("My Bag", "$24", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTwQ0syEOfQ8TnEUczI1Xmy8Tc4lwsSkGDyRA&usqp=CAU")
val user7 =
User("Bag b", "$23", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRDUgVcWDOUxkEb0fOrxenG2o_ujljbUaS3aQ&usqp=CAU")
val user8 =
User("Bags", "$20", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTgvk9zW-IGR1kFjdtWGp6CG6oZtlStGJnDHw&usqp=CAU")
val user9 =
User("shopping Bag", "$14", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR2YwDgCT83wfikBrI9mMhX4YItHxVNy5t26w&usqp=CAU")
val user10 =
User("bags", "$43", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTu-PsgBuoFAaL_DuAbwjNN3YZ8U0YQy8NGeA&usqp=CAU")
val user11 =
User("my bags", "$23", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSb791D7qVA3F9QL25FtCCHqC-GDR6uIRE7Ew&usqp=CAU")
val user12 =
User("New Bags ", "$31", "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRNhGtr7RE2Y3INqiKbn6qz-CC4lUSeVsUyew&usqp=CAU")

GlobalScope.launch
db.UserDao().deleteAll()
db.UserDao().insert(user1, user2, user3, user4,user5,user6,user7,user8,user9,user10,user11,user12)
displayUsers()

private suspend fun displayUsers()
val users: List<User> = db.UserDao().getAllUsers()
runOnUiThread()
adapter?.Updatedata(users)


El código fuente está aquí.

Eso es todo. Codificación feliz.

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