Android RecyclerView添加Header头部

爱被打了一巴掌 2023-10-17 09:01 196阅读 0赞

**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][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：

![Center][]

[https_github.com_blipinsk_RecyclerViewHeader]: https://github.com/blipinsk/RecyclerViewHeader
[Center]: https://img-blog.csdn.net/20161013170708566?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center