recycleview 增加自定义头部和尾部

compile 'com.android.support:recyclerview-v7:25.3.1'

/**
 * 作者：jiuqunZhang on 2018/7/4 10:20
 * 邮箱：woshizhangjiqun@gmail.com
 */

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder> {

    private RecyclerView mRecyclerView;

    private List<String> data = new ArrayList<>();
    private Context mContext;

    private View VIEW_FOOTER;
    private View VIEW_HEADER;

    //Type
    private int TYPE_NORMAL = 1000;
    private int TYPE_HEADER = 1001;
    private int TYPE_FOOTER = 1002;

    public MyAdapter(List<String> data, Context mContext) {
        this.data = data;
        this.mContext = mContext;
    }

    @Override
    public MyAdapter.MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == TYPE_FOOTER) {
            return new MyHolder(VIEW_FOOTER);
        } else if (viewType == TYPE_HEADER) {
            return new MyHolder(VIEW_HEADER);
        } else {
            return new MyHolder(getLayout(R.layout.item_list_layout));
        }
    }

    @Override
    public void onBindViewHolder(MyHolder holder, int position) {
        if (!isHeaderView(position) && !isFooterView(position)) {
            if (haveHeaderView()) position--;
            TextView content = (TextView) holder.itemView.findViewById(R.id.item_content);
            TextView time = (TextView) holder.itemView.findViewById(R.id.item_time);
            content.setText(data.get(position));
            time.setText("2016-1-1");
        }
    }

    @Override
    public int getItemCount() {
        int count = (data == null ? 0 : data.size());
        if (VIEW_FOOTER != null) {
            count++;
        }

        if (VIEW_HEADER != null) {
            count++;
        }
        return count;
    }

    @Override
    public int getItemViewType(int position) {
        if (isHeaderView(position)) {
            return TYPE_HEADER;
        } else if (isFooterView(position)) {
            return TYPE_FOOTER;
        } else {
            return TYPE_NORMAL;
        }
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        try {
            if (mRecyclerView == null && mRecyclerView != recyclerView) {
                mRecyclerView = recyclerView;
            }
            ifGridLayoutManager();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private View getLayout(int layoutId) {
        return LayoutInflater.from(mContext).inflate(layoutId, null);
    }

    public void addHeaderView(View headerView) {
        if (haveHeaderView()) {
            throw new IllegalStateException("hearview has already exists!");
        } else {
            //避免出现宽度自适应
            ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            headerView.setLayoutParams(params);
            VIEW_HEADER = headerView;
            ifGridLayoutManager();
            notifyItemInserted(0);
        }

    }

    public void addFooterView(View footerView) {
        if (haveFooterView()) {
            throw new IllegalStateException("footerView has already exists!");
        } else {
            ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            footerView.setLayoutParams(params);
            VIEW_FOOTER = footerView;
            ifGridLayoutManager();
            notifyItemInserted(getItemCount() - 1);
        }
    }

    private void ifGridLayoutManager() {
        if (mRecyclerView == null) return;
        final RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager) {
            final GridLayoutManager.SpanSizeLookup originalSpanSizeLookup =
                    ((GridLayoutManager) layoutManager).getSpanSizeLookup();
            ((GridLayoutManager) layoutManager).setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                @Override
                public int getSpanSize(int position) {
                    return (isHeaderView(position) || isFooterView(position)) ?
                            ((GridLayoutManager) layoutManager).getSpanCount() :
                            1;
                }
            });
        }
    }

    private boolean haveHeaderView() {
        return VIEW_HEADER != null;
    }

    public boolean haveFooterView() {
        return VIEW_FOOTER != null;
    }

    private boolean isHeaderView(int position) {
        return haveHeaderView() && position == 0;
    }

    private boolean isFooterView(int position) {
        return haveFooterView() && position == getItemCount() - 1;
    }


    public static class MyHolder extends RecyclerView.ViewHolder {

        public MyHolder(View itemView) {
            super(itemView);
        }
    }

}

private void initRecyc() {
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

    List <String> data=new ArrayList<>();
    for (int i = 0; i < 10; i++) {
        data.add(i+"xianjin");
    }
    mMyAdapter = new MyAdapter(data, this);
    mRecyclerView.setAdapter(mMyAdapter);

    mMyAdapter.addFooterView(LayoutInflater.from(this).inflate(R.layout.item_footer_layout,null));
    mMyAdapter.addHeaderView(LayoutInflater.from(this).inflate(R.layout.item_header_layout,null));
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:text="woshidingbu             fingbu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</android.support.constraint.ConstraintLayout>

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

    <TextView
        android:id="@+id/item_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/app_name"
        android:textSize="16sp" />

    <TextView
        android:id="@+id/item_time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/app_name"
        android:textSize="16sp" />

</LinearLayout>