Android RecyclerView添加Header头部

Android RecyclerView添加Header头部

Android RecyclerView不像以前的ListView那样直接添加头部，如果要给RecyclerView增加头部，则需要自己写或者使用第三方开源项目。
RecyclerViewHeader是github上的一个开源项目，旨在为Android RecyclerView增加头部，其在github上的项目主页是：https://github.com/blipinsk/RecyclerViewHeader
RecyclerViewHeader使用相对比较简单，写一个例子。
注意RecyclerViewHeader的布局文件写法：

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView

        android:id="@+id/recyclerView"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

    <com.bartoszlipinski.recyclerviewheader2.RecyclerViewHeader xmlns:android="http://schemas.android.com/apk/res/android"

        android:id="@+id/header"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="top">

        <TextView

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:background="@android:color/holo_orange_light"

            android:gravity="center"

            android:text="zhang phil @ csdn"

            android:textColor="@android:color/white" />

    </com.bartoszlipinski.recyclerviewheader2.RecyclerViewHeader>

</FrameLayout>

上层Java代码：

package zhangphil.app;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import com.bartoszlipinski.recyclerviewheader2.RecyclerViewHeader;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);

        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        recyclerView.setLayoutManager(layoutManager);

        ItemAdapter adapter = new ItemAdapter();

        recyclerView.setAdapter(adapter);

        //添加RecyclerView头部

        RecyclerViewHeader header = (RecyclerViewHeader) findViewById(R.id.header);

        header.attachTo(recyclerView);

    }

    private class ItemViewHolder extends RecyclerView.ViewHolder {

        public TextView text;

        public ItemViewHolder(View itemView) {

            super(itemView);

            text = (TextView) itemView.findViewById(android.R.id.text1);

        }

    }

    private class ItemAdapter extends RecyclerView.Adapter<ItemViewHolder> {

        @Override

        public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            View view = View.inflate(parent.getContext(), android.R.layout.simple_list_item_1, null);

            ItemViewHolder holder = new ItemViewHolder(view);

            return holder;

        }

        @Override

        public void onBindViewHolder(ItemViewHolder holder, int position) {

            holder.text.setText(String.valueOf(position));

        }

        @Override

        public int getItemCount() {

            return 20;

        }

    }

}

代码运行结果：

巴特西

Android RecyclerView添加Header头部

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