android recyclerview添加头部,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：

android:layout_width="match_parent"

android:layout_height="match_parent">

android:id="@+id/recyclerView"

android:layout_width="match_parent"

android:layout_height="match_parent" />

android:id="@+id/header"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_gravity="top">

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" />

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 {

@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：