이 예는 Android의 TextView에서 텍스트를 양쪽 정렬하는 방법을 보여줍니다.
1단계 − Android Studio에서 새 프로젝트를 생성하고 파일 ⇒ 새 프로젝트로 이동하여 필요한 모든 세부 정보를 입력하여 새 프로젝트를 생성합니다.
2단계 − res/layout/activity_main.xml에 다음 코드를 추가합니다.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android" xmlns:app="https://schemas.android.com/apk/res-auto" xmlns:tools="https://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:scrollbars="none" /> </RelativeLayout>
3단계 − res/layout/list_item.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:id="@+id/container" android:padding="16dp" android:layout_height="match_parent"> <TextView android:id="@+id/song_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:layout_marginTop="10dp" android:textSize="18dp" android:textStyle="bold" android:textColor="@color/colorPrimaryDark"/> <TextView android:id="@+id/song_year" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:textColor="#000" android:layout_below="@+id/song_title" android:layout_alignLeft="@+id/song_title" android:layout_alignStart="@+id/song_title" android:layout_marginTop="20dp" /> <TextView android:id="@+id/song_author" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:textColor="#000" android:layout_alignTop="@+id/song_year" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /> </RelativeLayout>
4단계 − src/MainActivity.java
에 다음 코드 추가package com.app.sample; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.os.Bundle; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private final String TAG = "MainActivity"; private RecyclerView recyclerView; private LinearLayoutManager layoutManager; private RecyclerViewAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = (RecyclerView)findViewById(R.id.recycler_view); recyclerView.addItemDecoration(new SimpleDividerItemDecoration(this)); layoutManager = new LinearLayoutManager(MainActivity.this); recyclerView.setLayoutManager(layoutManager); List<ItemObject> posts = returnListItems(); adapter = new RecyclerViewAdapter(MainActivity.this, posts); recyclerView.setAdapter(adapter); } private List<ItemObject> returnListItems(){ List<ItemObject> items = new ArrayList<ItemObject>(); items.add(new ItemObject("Blank Space", "Taylor Swift", "2016")); items.add(new ItemObject("Uptown Funk", "Mark Ronson", "2016")); items.add(new ItemObject("Can't Feel My Face", "The Weeknd", "2016")); items.add(new ItemObject("Cheerleader", "OMI", "2016")); items.add(new ItemObject("What Do You Mean?", "Justin Bieber", "2016")); items.add(new ItemObject("Hello", "Adele", "2016")); return items; } }
5단계 − src/ItemObject.java에 다음 코드 추가
package com.app.sample; public class ItemObject { private String songTitle; private String songYear; private String songAuthor; public ItemObject(String songTitle, String songYear, String songAuthor) { this.songTitle = songTitle; this.songYear = songYear; this.songAuthor = songAuthor; } public String getSongTitle() { return songTitle; } public String getSongYear() { return songYear; } public String getSongAuthor() { return songAuthor; } }
6단계 − src/RecyclerViewAdapter.java에 다음 코드 추가
package com.app.sample; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import androidx.recyclerview.widget.RecyclerView; import java.util.List; public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders>{ private List<ItemObject> itemList; private Context context; public RecyclerViewAdapter(Context context, List<ItemObject> itemList) { this.itemList = itemList; this.context = context; } @Override public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) { View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, null); RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView); return rcv; } @Override public void onBindViewHolder(RecyclerViewHolders holder, int position) { holder.songTitle.setText("Song Title: " + itemList.get(position).getSongTitle()); holder.songYear.setText("Song Year: " + itemList.get(position).getSongYear()); holder.songAuthor.setText("Song Author: " + itemList.get(position).getSongAuthor()); } @Override public int getItemCount() { return this.itemList.size(); } }
7단계 − src/RecyclerViewHolders.java에 다음 코드 추가
package com.app.sample; import android.util.SparseBooleanArray; import android.view.View; import android.widget.TextView; import androidx.recyclerview.widget.RecyclerView; public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener { public TextView songTitle; public TextView songYear; public TextView songAuthor; private SparseBooleanArray selectedItems = new SparseBooleanArray(); public RecyclerViewHolders(View itemView) { super(itemView); itemView.setOnClickListener(this); songTitle = (TextView)itemView.findViewById(R.id.song_title); songYear = (TextView)itemView.findViewById(R.id.song_year); songAuthor = (TextView)itemView.findViewById(R.id.song_author); } @Override public void onClick(View view) { if (selectedItems.get(getAdapterPosition(), false)) { selectedItems.delete(getAdapterPosition()); view.setSelected(false); } else { selectedItems.put(getAdapterPosition(), true); view.setSelected(true); } } }
8단계 − Manifests/AndroidManifest.xml에 다음 코드 추가
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="https://schemas.android.com/apk/res/android" package="com.app.sample"> <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 도구 모음에서 실행 아이콘을 클릭합니다. 모바일 장치를 옵션으로 선택한 다음 기본 화면을 표시할 모바일 장치를 확인하십시오 -