이 예는 Kotlin을 사용하여 Android 앱에서 RecyclerView로 작업하는 방법을 보여줍니다.
1단계 − Android Studio에서 새 프로젝트를 만들고 파일로 이동하시겠습니까? 새 프로젝트를 만들고 새 프로젝트를 만드는 데 필요한 모든 세부 정보를 입력합니다.
2단계 − res/layout/activity_main.xml에 다음 코드를 추가합니다.
예시
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="https://schemas.android.com/apk/res/android" android:id="@+id/rlMain" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="16dp" android:orientation="vertical"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
3단계 − src/MainActivity.kt에 다음 코드 추가
import android.os.Bundle import androidx.appcompat.app.AppCompatActivity import androidx.recyclerview.widget.DefaultItemAnimator import androidx.recyclerview.widget.LinearLayoutManager import androidx.recyclerview.widget.RecyclerView class MainActivity : AppCompatActivity() { private val movieList = ArrayList<MovieModel>() private lateinit var moviesAdapter: MoviesAdapter override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" val recyclerView: RecyclerView = findViewById(R.id.recyclerView) moviesAdapter = MoviesAdapter(movieList) val layoutManager = LinearLayoutManager(applicationContext) recyclerView.layoutManager = layoutManager recyclerView.itemAnimator = DefaultItemAnimator() recyclerView.adapter = moviesAdapter prepareMovieData() } private fun prepareMovieData() { var movie = MovieModel("Mad Max: Fury Road", "Action & Adventure", "2015") movieList.add(movie) movie = MovieModel("Inside Out", "Animation, Kids & Family", "2015") movieList.add(movie) movie = MovieModel("Star Wars: Episode VII - The Force Awakens", "Action", "2015") movieList.add(movie) movie = MovieModel("Shaun the Sheep", "Animation", "2015") movieList.add(movie) movie = MovieModel("The Martian", "Science Fiction & Fantasy", "2015") movieList.add(movie) movie = MovieModel("Mission: Impossible Rogue Nation", "Action", "2015") movieList.add(movie) movie = MovieModel("Up", "Animation", "2009") movieList.add(movie) movie = MovieModel("Star Trek", "Science Fiction", "2009") movieList.add(movie) movie = MovieModel("The LEGO MovieModel", "Animation", "2014") movieList.add(movie) movie = MovieModel("Iron Man", "Action & Adventure", "2008") movieList.add(movie) movie = MovieModel("Aliens", "Science Fiction", "1986") movieList.add(movie) movie = MovieModel("Chicken Run", "Animation", "2000") movieList.add(movie) movie = MovieModel("Back to the Future", "Science Fiction", "1985") movieList.add(movie) movie = MovieModel("Raiders of the Lost Ark", "Action & Adventure", "1981") movieList.add(movie) movie = MovieModel("Goldfinger", "Action & Adventure", "1965") movieList.add(movie) movie = MovieModel("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014") movieList.add(movie) moviesAdapter.notifyDataSetChanged() } }
4단계 − MovieModel.kt 클래스를 새로 만들고 다음 코드를 추가합니다. −
class MovieModel(title: String?, genre: String?, year: String?) { private var title: String private var genre: String private var year: String init { this.title = title!! this.genre = genre!! this.year = year!! } fun getTitle(): String? { return title } fun setTitle(name: String?) { title = name!! } fun getYear(): String? { return year } fun setYear(year: String?) { this.year = year!! } fun getGenre(): String? { return genre } fun setGenre(genre: String?) { this.genre = genre!! } }
5단계 − 새 클래스 MoviesAdapter.kt를 만들고 다음 코드를 추가합니다. −
import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.TextView import androidx.annotation.NonNull import androidx.recyclerview.widget.RecyclerView internal class MoviesAdapter(private var moviesList: List<MovieModel>) : RecyclerView.Adapter<MoviesAdapter.MyViewHolder>() { internal inner class MyViewHolder(view: View) : RecyclerView.ViewHolder(view) { var title: TextView = view.findViewById(R.id.title) var year: TextView = view.findViewById(R.id.year) var genre: TextView = view.findViewById(R.id.genre) } @NonNull override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder { val itemView = LayoutInflater.from(parent.context) .inflate(R.layout.movie_list, parent, false) return MyViewHolder(itemView) } override fun onBindViewHolder(holder: MyViewHolder, position: Int) { val movie = moviesList[position] holder.title.text = movie.getTitle() holder.genre.text = movie.getGenre() holder.year.text = movie.getYear() } override fun getItemCount(): Int { return moviesList.size } }
6단계 − item_row.xml 레이아웃 리소스 파일을 만들고 다음을 추가합니다. −
<?xml version="1.0" encoding="utf-8"?> <androidx.cardview.widget.CardView xmlns:android="https://schemas.android.com/apk/res/android" xmlns:app="https://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="100dp" android:layout_margin="8dp" app:cardBackgroundColor="@android:color/holo_red_dark"> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:padding="8dp"> <TextView android:id="@+id/title" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentStart="true" android:layout_toStartOf="@+id/year" android:textColor="@android:color/white" android:textSize="16sp" android:textStyle="bold" /> <TextView android:id="@+id/year" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentEnd="true" android:textColor="@android:color/white" /> <TextView android:id="@+id/genre" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:textColor="@android:color/white" /> </RelativeLayout> </androidx.cardview.widget.CardView>
7단계 − androidManifest.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="https://schemas.android.com/apk/res/android" package="com.example.q11"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
응용 프로그램을 실행해 보겠습니다. 실제 Android 모바일 장치를 컴퓨터에 연결했다고 가정합니다. Android 스튜디오에서 앱을 실행하려면 프로젝트의 활동 파일 중 하나를 열고 실행 아이콘을 클릭하세요. 도구 모음에서. 모바일 장치를 옵션으로 선택한 다음 기본 화면을 표시할 모바일 장치를 확인하십시오.