很簡單爲RecyclerView添加頭部：使用一個類RecyclerViewHeader

首先看下自己的RecyclerView是否包裹在 LinearLayout, FrameLayout, RelativeLayout.這三種佈局中，否則會報錯：

 Currently, NOT already aligned RecyclerViewHeader can only be used for RecyclerView with a parent of one of types: LinearLayout, FrameLayout, RelativeLayout.

意思就是說RecyclerViewHeader這個東西只使用在線性佈局、幀佈局、相對佈局包裹下的RecyclerView

例如：

activity_main佈局

<LinearLayout   

    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" />

</LinearLayout>

檢查好上面的步驟之後，開始RecyclerViewHeader

1、首先在model層的build的dependencies中加入依賴：compile 'com.bartoszlipinski.recyclerviewheader:library:1.2.0'

dependencies {
    compile 'com.bartoszlipinski.recyclerviewheader:library:1.2.0'
}

爲你的header創建一個XML佈局文件：（就是你要加的頭部的佈局，我這裏只加了一個TextView），這是一個單獨的xml文件

1、創建一個佈局文件

<?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="100dp">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="header" />
</FrameLayout>

2、MainActivity代碼

public class MainActivity extends AppCompatActivity implements MyRecyclerViewAdapter.onItemClickListener {

    //聲明RecyclerView
    private RecyclerView mRecyclerview;
    //數據源
    private List<String> list;

    //聲明Adapter
    MyRecyclerViewAdapter myRecyclerViewAdapter;

    //聲明RecyclerViewHeader對象
    RecyclerViewHeader header;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //初始化RecyclerViewHeader
        header = RecyclerViewHeader.fromXml(this, R.layout.header);

        mRecyclerview = (RecyclerView) findViewById(R.id.recyclerview);
        
        list = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            list.add("這是第" + i + "條");
        }
        myRecyclerViewAdapter = new MyRecyclerViewAdapter(list);

//使用RecyclerView一定要setLayoutManager
        mRecyclerview.setLayoutManager(new LinearLayoutManager(this));

//        mRecyclerview.setLayoutManager(new GridLayoutManager(this,2));
//        mRecyclerview.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.HORIZONTAL));

 //把RecyclerViewHeader賦予RecyclerView,這個一定要寫在setLayoutManager之後

	header.attachTo(mRecyclerview);
        mRecyclerview.setAdapter(myRecyclerViewAdapter);
        myRecyclerViewAdapter.setOnItemClickListener(this);
        
    }

    @Override
    public void onItemClick(View view, int position) {
        Log.d("TAG", "類名==MainActivity" + "方法名==onItemClick===:" + "當前點擊的是第" + position);
    }

}

目前該庫RecyclerViewHeader適用於LinearLayoutManager,GridLayoutManager和StaggeredGridLayoutManager佈局的RecyclerView。