转载请注明本文出自Cym的博客([http://blog.csdn.net/cym492224103](http://blog.csdn.net/cym492224103)),谢谢支持!
前言
大家都知道ListView在我们开发中很常用,Android5.0的到来,它给我们带来了一个替代
ListView的新的控件,也可以说是ListView的升级版,那就是RecyclerView。
接下来就让我们看一下,它们的作用的用法吧~!
RecyclerView
[RecyclerView](http://developer.android.com/reference/android/support/v7/widget/RecyclerView.html)控件是比[ListView](http://developer.android.com/reference/android/widget/ListView.html)更先进、灵活的版本。
该[RecyclerView](http://developer.android.com/reference/android/support/v7/widget/RecyclerView.html)类通过以下几点简化了显示和处理大量的数据:
1.为每个条目位置提供了布局管理器(RecyclerView.setLayoutManager)
[RecyclerView](http://developer.android.com/reference/android/support/v7/widget/RecyclerView.html)提供这些内置的布局管理器:
[LinearLayoutManager](http://developer.android.com/reference/android/support/v7/widget/LinearLayoutManager.html)(用来)显示垂直或水平滚动的列表项
[GridLayoutManager](http://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.html)(用来)显示网格中的item(项)
[StaggeredGridLayoutManager](http://developer.android.com/reference/android/support/v7/widget/StaggeredGridLayoutManager.html)(用来)显示交错的网格item(项目)
可以通过继承[RecyclerView.LayoutManager](http://developer.android.com/reference/android/support/v7/widget/RecyclerView.LayoutManager.html)类来自定义自己的布局管理器。
2.为每个条目设置了操作动画(RecyclerView.setItemAnimator)
使用步骤:
1.导入sdk/extras/android/support/v7/recyclerview/libs/android-support-v7-recyclerview.jar
2.xml配置
~~~
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
tools:listitem="@layout/list_basic_item"
/>
</RelativeLayout>
~~~
3.Activity代码
~~~
public class Main extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取RecyclerView对象
final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
// 创建线性布局管理器(默认是垂直方向)
final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
// 为RecyclerView指定布局管理对象
recyclerView.setLayoutManager(layoutManager);
// 创建Adapter
final SampleRecyclerAdapter sampleRecyclerAdapter = new SampleRecyclerAdapter();
// 填充Adapter
recyclerView.setAdapter(sampleRecyclerAdapter);
}
}
~~~
4.Adapter代码
~~~
public class SampleRecyclerAdapter extends
RecyclerView.Adapter<SampleRecyclerAdapter.ViewHolder>
{
private final ArrayList<SampleModel> sampleData = DemoApp.getSampleData(20);
// 用于创建控件
@Override
public ViewHolder onCreateViewHolder(ViewGroup parentViewGroup, int i)
{
// 获得列表项控件(LinearLayer对象)
// list_basic_item.xml布局文件中只包含一个<LinearLayer>标签,在该标签中包含
// 了一个<TextView>标签
// item是LinearLayout对象
View item = LayoutInflater.from(parentViewGroup.getContext()).inflate(
R.layout.list_basic_item, parentViewGroup, false);
return new ViewHolder(item);
}
// 为控件设置数据
@Override
public void onBindViewHolder(ViewHolder viewHolder, final int position)
{
// 获取当前item中显示的数据
final SampleModel rowData = sampleData.get(position);
// 设置要显示的数据
viewHolder.textViewSample.setText(rowData.getSampleText());
viewHolder.itemView.setTag(rowData);
}
@Override
public int getItemCount()
{
return sampleData.size();
}
// 删除指定的Item
public void removeData(int position)
{
sampleData.remove(position);
// 通知RecyclerView控件某个Item已经被删除
notifyItemRemoved(position);
}
// 在指定位置添加一个新的Item
public void addItem(int positionToAdd)
{
sampleData.add(positionToAdd,new SampleModel("新的列表项" + new Random().nextInt(10000)));
// 通知RecyclerView控件插入了某个Item
notifyItemInserted(positionToAdd);
}
public static class ViewHolder extends RecyclerView.ViewHolder
{
private final TextView textViewSample;
public ViewHolder(View itemView)
{
super(itemView);
textViewSample = (TextView) itemView
.findViewById(R.id.textViewSample);
}
}
}
~~~