RecyclerView高級用法：分組+吸頂效果實現(xiàn)

引言

??不知道大家有沒有仔細觀察過支付寶的賬單頁面，月份為組頭，賬單為組的內(nèi)容。賬單按月份進行分組，當連續(xù)往下滑動RecyclerView，當月月份仍顯示，下滑至前一月賬單時，由前一月的組頭頂替當前月組頭，如此循環(huán)往復(fù)。
??這一功能，又成為“吸頂”效果，原因無它，皆因內(nèi)容變化，導(dǎo)致組頭交替覆蓋，但最頂上的組頭位置不會發(fā)生任何改變，故稱吸頂。

效果預(yù)覽

用法

步驟一、添加第三方依賴庫

依賴：app下的build.gradle文件中添加：
implementation 'com.github.donkingliang:GroupedRecyclerViewAdapter:2.3.0'

步驟二、創(chuàng)建實體類

實體類1：GroupEntity
/**
 * 組數(shù)據(jù)的實體類
 */
public class GroupEntity {

    private String header;
    private String footer;
    private ArrayList<ChildEntity> children;

    public GroupEntity(String header, String footer, ArrayList<ChildEntity> children) {
        this.header = header;
        this.footer = footer;
        this.children = children;
    }

    public String getHeader() {
        return header;
    }

    public void setHeader(String header) {
        this.header = header;
    }

    public String getFooter() {
        return footer;
    }

    public void setFooter(String footer) {
        this.footer = footer;
    }

    public ArrayList<ChildEntity> getChildren() {
        return children;
    }

    public void setChildren(ArrayList<ChildEntity> children) {
        this.children = children;
    }
}
實體類2：ChildEntity
/**
 * 子項數(shù)據(jù)的實體類
 */
public class ChildEntity {

    private String child;

    public ChildEntity(String child) {
        this.child = child;
    }

    public String getChild() {
        return child;
    }

    public void setChild(String child) {
        this.child = child;
    }
}
實體類3：GroupModel
/**
 * @data on 12/1/20 4:11 PM
 * @auther armStrong
 * @describe  用來處理和獲?。侯^+體+尾數(shù)據(jù)
 */
public class GroupModel {

    /**
     * 獲取組列表數(shù)據(jù)
     *
     * @param groupCount    組數(shù)量
     * @param childrenCount 每個組里的子項數(shù)量
     * @return
     */
    public static ArrayList<GroupEntity> getGroups(int groupCount, int childrenCount) {
        ArrayList<GroupEntity> groups = new ArrayList<>();
        for (int i = 0; i < groupCount; i++) {
            ArrayList<ChildEntity> children = new ArrayList<>();
            for (int j = 0; j < childrenCount; j++) {
                children.add(new ChildEntity("第" + (i + 1) + "組第" + (j + 1) + "項"));
            }
            groups.add(new GroupEntity("第" + (i + 1) + "組頭部",
                    "第" + (i + 1) + "組尾部", children));
        }
        return groups;
    }
}

步驟三、布局文件

布局文件1：主布局R.layout.activity_case66
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".blog2.Case66"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/blue"
        android:gravity="center"
        android:text="RecyclerView吸頂效果"
        android:textColor="@color/white"
        android:textSize="20sp" />

    <com.donkingliang.groupedadapter.widget.StickyHeaderLayout
        android:id="@+id/sticky_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

    </com.donkingliang.groupedadapter.widget.StickyHeaderLayout>
</LinearLayout>
布局文件2：頭布局R.layout.adapter_header
<?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="wrap_content"
    android:background="@color/red"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_header"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textColor="@android:color/white"
        android:textSize="20sp" />

</LinearLayout>
布局文件3：內(nèi)容布局R.layout.adapter_child
<?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="wrap_content"
    android:background="@color/white"
    android:layout_marginBottom="1px"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_child"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@android:color/black"
        android:padding="8dp"
        android:textSize="16sp" />

</LinearLayout>
布局文件4：尾布局R.layout.adapter_footer
<?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="wrap_content"
    android:background="@color/green"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_footer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textColor="@android:color/white"
        android:textSize="20sp" />

</LinearLayout>

步驟四、為RecyclerView書寫Adapter

Adapter1：GroupedListAdapter
/**
 * @data on 11/25/20 2:13 PM
 * @auther armStrong
 * @describe 這是普通的分組Adapter 每一個組都有頭部、尾部和子項。
 */
public class GroupedListAdapter extends GroupedRecyclerViewAdapter {
    protected ArrayList<GroupEntity> mGroups;

    public GroupedListAdapter(Context context, ArrayList<GroupEntity> groups) {
        super(context);
        mGroups = groups;
    }

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

    @Override
    public int getChildrenCount(int groupPosition) {
        ArrayList<ChildEntity> children = mGroups.get(groupPosition).getChildren();
        return children == null ? 0 : children.size();
    }

    public void clear(){
        mGroups.clear();
        notifyDataChanged();
    }

    public void setGroups(ArrayList<GroupEntity> groups){
        mGroups = groups;
        notifyDataChanged();
    }

    @Override
    public boolean hasHeader(int groupPosition) {
        return true;
    }

    @Override
    public boolean hasFooter(int groupPosition) {
        return true;
    }

    @Override
    public int getHeaderLayout(int viewType) {
        return R.layout.adapter_header;
    }

    @Override
    public int getFooterLayout(int viewType) {
        return R.layout.adapter_footer;
    }

    @Override
    public int getChildLayout(int viewType) {
        return R.layout.adapter_child;
    }

    @Override
    public void onBindHeaderViewHolder(BaseViewHolder holder, int groupPosition) {
        GroupEntity entity = mGroups.get(groupPosition);
        holder.setText(R.id.tv_header, entity.getHeader());
    }

    @Override
    public void onBindFooterViewHolder(BaseViewHolder holder, int groupPosition) {
        GroupEntity entity = mGroups.get(groupPosition);
        holder.setText(R.id.tv_footer, entity.getFooter());
    }

    @Override
    public void onBindChildViewHolder(BaseViewHolder holder, int groupPosition, int childPosition) {
        ChildEntity entity = mGroups.get(groupPosition).getChildren().get(childPosition);
        holder.setText(R.id.tv_child, entity.getChild());
    }
}
Adaprer2：NoFooterAdapter
/**
 * @data on 12/1/20 4:38 PM
 * @auther  armStrong
 * @describe  沒有尾部的Adapter(用來做吸頂效果)
 */
public class NoFooterAdapter extends GroupedListAdapter {

    public NoFooterAdapter(Context context, ArrayList<GroupEntity> groups) {
        super(context, groups);
    }

    /**
     * 返回false表示沒有組尾
     *
     * @param groupPosition
     * @return
     */
    @Override
    public boolean hasFooter(int groupPosition) {
        return false;
    }

    /**
     * 當hasFooter返回false時，這個方法不會被調(diào)用。
     *
     * @return
     */
    @Override
    public int getFooterLayout(int viewType) {
        return 0;
    }

    /**
     * 當hasFooter返回false時，這個方法不會被調(diào)用。
     *
     * @param holder
     * @param groupPosition
     */
    @Override
    public void onBindFooterViewHolder(BaseViewHolder holder, int groupPosition) {

    }
}

步驟五、在Activity中書寫業(yè)務(wù)邏輯

public class Case66 extends AppCompatActivity {
    private RecyclerView recycler;
    private StickyHeaderLayout stickyLayout;
    private LinearLayoutManager layoutManager;
    private NoFooterAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_case66);
        initView();
        initAdatper();
        //設(shè)置是否吸頂。
        stickyLayout.setSticky(true);
    }

    private void initAdatper() {
        layoutManager = new LinearLayoutManager(this);
        recycler.setLayoutManager(layoutManager);
        adapter = new NoFooterAdapter(this, GroupModel.getGroups(10, 5));
        adapter.setOnHeaderClickListener(new GroupedRecyclerViewAdapter.OnHeaderClickListener() {
            @Override
            public void onHeaderClick(GroupedRecyclerViewAdapter adapter, BaseViewHolder holder,
                                      int groupPosition) {
                Toast.makeText(Case66.this, "組頭：groupPosition = " + groupPosition,
                        Toast.LENGTH_LONG).show();
                Log.e("eee", adapter.toString() + "  " + holder.toString());
            }
        });

        adapter.setOnChildClickListener(new GroupedRecyclerViewAdapter.OnChildClickListener() {
            @Override
            public void onChildClick(GroupedRecyclerViewAdapter adapter, BaseViewHolder holder,
                                     int groupPosition, int childPosition) {
                Toast.makeText(Case66.this, "子項：groupPosition = " + groupPosition
                                + ", childPosition = " + childPosition,
                        Toast.LENGTH_LONG).show();
            }
        });
        recycler.setAdapter(adapter);
    }

    private void initView(){
        recycler = (RecyclerView) findViewById(R.id.rv_list);
        stickyLayout = (StickyHeaderLayout) findViewById(R.id.sticky_layout);
    }
}

大功告成！

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