[Android/Java] FrameLayout(+Recycler) & Adapter

 

●fragment_board.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".BoardFragment">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <Button
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:text="게시글 추가"/>

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

    </LinearLayout>
</FrameLayout>

FrameLaout 안에 LinearLayout을 vertical정렬로 설정하고

RecyclerView를 만든다 ( id도 설정한다 )

 

 

 

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●board_list.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/board_no"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="board_no" />

    <TextView
            android:id="@+id/board_subject"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="board_subject"/>

        <TextView
            android:id="@+id/board_content"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="board_content"/>

    </LinearLayout>

RecyclerView에 들어갈 item을 만든다

 

---

 

●BoardAdapter.java

public class BoardAdapter extends RecyclerView.Adapter<BoardAdapter.ViewHolder> {
    private String[] localDataSet;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;

        public ViewHolder(View view) {
            super(view);
            // Define click listener for the ViewHolder's View

            textView = (TextView) view.findViewById(R.id.textView);
        }

    }

    public BoardAdapter(String[] dataSet) {
        localDataSet = dataSet;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        // Create a new view, which defines the UI of the list item
        View view = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.board_list, viewGroup, false);

        return new ViewHolder(view);
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int position) {

        // Get element from your dataset at this position and replace the
        // contents of the view with that element

        viewHolder.textView.setText(position);
    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return localDataSet.length;
    }
}

https://developer.android.com/guide/topics/ui/layout/recyclerview?hl=ko 

RecyclerView로 동적 목록 만들기  |  Android 개발자  |  Android Developers

 

 

참고해서 기본 RecyclerAdapter를 만들고

onCreateViewHolder에 layout을 방금 만들었던 board_list로 지정해준다

 

---

 

●BoardData.java

public String getBoard_no() {
    return board_no;
}

public void setBoard_no(String board_no) {
    this.board_no = board_no;
}

public String getBoard_subject() {
    return board_subject;
}

public void setBoard_subject(String board_subject) {
    this.board_subject = board_subject;
}

public String getBoard_content() {
    return board_content;
}

public void setBoard_content(String board_content) {
    this.board_content = board_content;
}

사용할 데이터를 새로운 파일에서  getter, setter만들어준다

 

---

 

●BoardFragment.java

private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    private RecyclerView.LayoutManager layoutManager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_board, container, false);

        recyclerView = view.findViewById(R.id.recyclerview);

        //리사이클러뷰의 레이아웃 매니저 설정
        layoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(layoutManager);

        List<BoardData> boardDataList = new ArrayList<>();

        BoardData boardData = new BoardData();
        boardData.setBoard_no("1");
        boardData.setBoard_subject("sub");
        boardData.setBoard_content("cont");

        boardDataList.add(boardData);
        Log.d("board", String.valueOf(boardDataList));

        adapter = new BoardAdapter(boardDataList);
        recyclerView.setAdapter(adapter);
        return view;
    }

BoardFragment에서 adapter와 layoutManager를 꼭 RecyclerView안에서로 지정!

boardData에 임의로 값을 set해주고 boards에 add헀다

 

그 board를 adapter에 집어넣고

그 adapter를 recyclerview에 setAdapter해서 마무리!!

 

 

이제 Adapter로 ▼▼▼

 

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●BoardAdapter,java

private List<BoardData> boardDataList;


public BoardAdapter(List<BoardData> boardDataset) {
    boardDataList = boardDataset;
}

List형식으로 boardDataList로 바꾸고

 

 

@Override
public void onBindViewHolder(BoardViewHolder viewHolder, int position) {

    BoardData boardData = boardDataList.get(position);
    Log.d("boarddata", String.valueOf(boardData));
    viewHolder.board_no.setText(boardData.getBoard_no());
    viewHolder.board_subject.setText(boardData.getBoard_subject());
    viewHolder.board_content.setText(boardData.getBoard_content());

}

boardDataList에서 get해서

각각 맞는 viewHolder의 TextView에서 setText한다

 

@Override
public int getItemCount() {
    return boardDataList == null ? 0 : boardDataList.size();
}

ItemCount는 null이아닐때 boardList의 size만큼으로 변경한다