RecyclerView的下拉刷新和下拉加载

RecyclerView是比listview更强悍的一个控件，样式能够是列表式，瀑布式，或者是网格式。

能够参照Hongyang大神的博客：http://blog.csdn.net/lmj623565791/article/details/45059587。

下面写一下RecyclerView的下拉刷新和上拉加载。这是用到第三方一个大神写好的。首先进行依赖：

1    compile 'com.android.support:recyclerview-v7:23.1.1'
2    compile 'com.chanven.lib:cptr:1.0.0'

主布局文件是：

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools" 
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent" 
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context="com.didiincubator.recycleview.MainActivity">
10     <com.chanven.lib.cptr.PtrClassicFrameLayout
11         android:id="@+id/ptr_class"
12         android:layout_width="match_parent"
13         android:layout_height="match_parent">
14         <android.support.v7.widget.RecyclerView
15             android:id="@+id/recycleView"
16             android:layout_width="match_parent"
17             android:layout_height="match_parent"
18             >
19         </android.support.v7.widget.RecyclerView>
20     </com.chanven.lib.cptr.PtrClassicFrameLayout>
21 
22 </RelativeLayout

item布局文件，比较简单，就写了一个Textview:

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:orientation="vertical" 
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5 <TextView
 6     android:id="@+id/textView"
 7     android:layout_width="match_parent"
 8     android:layout_height="match_parent"/>
 9     <LinearLayout
10         android:layout_width="match_parent"
11         android:layout_height="1px"
12         android:background="#eeefff"
13         ></LinearLayout>
14 </LinearLayout>

先写适配器吧，RecyclerView的适配器和ListView略不同，可是大概仍是差很少的：

/**
 * 1先建立MyViewHolder而且继承RecyclerView.ViewHodler
 * 2.适配器继承RecyclerView.Adapter，而且写上泛型<>
 * 3.实现里面的方法。在MyViewHolder onCreateViewHolder（）方法中绑定布局
 * 4.在Binder方法中设置item中的内容，写上业务逻辑，监听等内容。
 */

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
    List<String> mList;
    Context mContext;
    LayoutInflater inflater;
    MyAdapter(List<String> mList,Context context){
        this.mList=mList;
        this.mContext=context;
        inflater=LayoutInflater.from(mContext);
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        /**
         * 1.绑定布局
         * 
         */
        View view=inflater.inflate(R.layout.item,parent,false);
        MyViewHolder myViewHolder=new MyViewHolder(view);
        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        MyViewHolder viewHolder= (MyViewHolder) holder;
        viewHolder.mTextView.setText(mList.get(position));
        viewHolder.mTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(mContext, "a", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return mList==null ? 0 : mList.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView mTextView;
        public MyViewHolder(View itemView) {
            super(itemView);
            mTextView= (TextView) itemView.findViewById(R.id.textView);
        }
    }
}

 而后就剩下在主布局里：绑定适配器，请求数据等，固然请求数据是不能在ui线程中，可是网络请求框架请求数据能够直接在主线程中直接进行请求，如nohttp,xutils3等

 1 public class MainActivity extends AppCompatActivity {
 2    private List<String> mList=new ArrayList<>();
 3     RecyclerView mRecyclerView;
 4     MyAdapter myAdapter;//本身定义的适配器
 5     RecyclerAdapterWithHF mAdapterWithHF;//第三方的适配器，我以为是进行刷新和加载而设置的
 6     PtrClassicFrameLayout mFrameLayout;
 7 
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         super.onCreate(savedInstanceState);
11         setContentView(R.layout.activity_main);
12         initView();
13         //initData();
14         myAdapter=new MyAdapter(mList,this);
15         mAdapterWithHF=new RecyclerAdapterWithHF(myAdapter);//自带的适配器,带刷新和加载
16         mRecyclerView.setAdapter(mAdapterWithHF);
17         initListener();
18     }
19 
20     private void initData() {
21         for (int i=0;i<10;i++){
22             mList.add("数据"+i);
23         }
24     }
25 
26     private void initView() {
27         mRecyclerView= (RecyclerView) findViewById(R.id.recycleView);
28         mFrameLayout = (PtrClassicFrameLayout) findViewById(R.id.ptr_class);
29         mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
30 
31     }
32     private void initListener() {
33         mFrameLayout.setLastUpdateTimeRelateObject(this);//设置刷新支持时间
34         mFrameLayout.setResistance(1.7f);
35         mFrameLayout.setDurationToCloseHeader(1000);
36         // 默认为false
37         mFrameLayout.setPullToRefresh(false);
38         // 默认为true
39         mFrameLayout.setKeepHeaderWhenRefresh(true);
40         //进入Activity就进行自动下拉刷新
41         mFrameLayout.postDelayed(new Runnable() {
42             @Override
43             public void run() {
44                 mFrameLayout.autoRefresh();
45             }
46         }, 100);
47         //下拉刷新
48         mFrameLayout.setPtrHandler(new PtrDefaultHandler() {
49             @Override
50             public void onRefreshBegin(PtrFrameLayout frame) {
51                 mList.clear();
52                 initData();//模拟加载数据
53                 //模拟联网，延迟更新数据
54                 new Handler().postDelayed(new Runnable() {
55                     @Override
56                     public void run() {
57                         mAdapterWithHF.notifyDataSetChanged();//适配器更新数据
58                         mFrameLayout.refreshComplete();//
59                         mFrameLayout.setLoadMoreEnable(true);
60                     }
61                 },1000);
62             }
63         });
64         //上拉加载
65         mFrameLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
66             @Override
67             public void loadMore() {
68                 //模拟网络延迟
69                 new Handler().postDelayed(new Runnable() {
70                     @Override
71                     public void run() {
72                         initData();//模拟加载数据
73                         mAdapterWithHF.notifyDataSetChanged();
74                         mFrameLayout.loadMoreComplete(true);
75                     }
76                 },1000);
77             }
78         });
79     }
80 }