RecyclerView的下拉刷新和下拉加載

RecyclerView是比listview更強悍的一個控件，樣式可以是列表式，瀑布式，或者是網格式。

可以參照Hongyang大神的博客：http://blog.csdn.net/lmj623565791/article/details/45059587。

下面寫一下RecyclerView的下拉刷新和上拉加載。這是用到第三方一個大神寫好的。首先進行依賴：

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

主布局文件是：

<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" 
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.didiincubator.recycleview.MainActivity">
    <com.chanven.lib.cptr.PtrClassicFrameLayout
        android:id="@+id/ptr_class"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycleView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            >
        </android.support.v7.widget.RecyclerView>
    </com.chanven.lib.cptr.PtrClassicFrameLayout>

</RelativeLayout

item布局文件，比較簡單，就寫了一個Textview:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" 
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<TextView
    android:id="@+id/textView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#eeefff"
        ></LinearLayout>
</LinearLayout>

先寫適配器吧，RecyclerView的適配器和ListView略不一樣，但是大概還是差不多的：

/**
 * 1先創建MyViewHolder並且繼承RecyclerView.ViewHodler
 * 2.適配器繼承RecyclerView.Adapter，並且寫上泛型<>
 * 3.實現里面的方法。在MyViewHolder onCreateViewHolder（）方法中綁定布局
 * 4.在Binder方法中設置item中的內容，寫上業務邏輯，監聽等內容。
 */

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.綁定布局
         * 
         */
        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);
        }
    }
}

 然后就剩下在主布局里：綁定適配器，請求數據等，當然請求數據是不能在ui線程中，但是網絡請求框架請求數據可以直接在主線程中直接進行請求，如nohttp,xutils3等

public class MainActivity extends AppCompatActivity {
   private List<String> mList=new ArrayList<>();
    RecyclerView mRecyclerView;
    MyAdapter myAdapter;//自己定義的適配器
    RecyclerAdapterWithHF mAdapterWithHF;//第三方的適配器，我覺得是進行刷新和加載而設置的
    PtrClassicFrameLayout mFrameLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        //initData();
        myAdapter=new MyAdapter(mList,this);
        mAdapterWithHF=new RecyclerAdapterWithHF(myAdapter);//自帶的適配器,帶刷新和加載
        mRecyclerView.setAdapter(mAdapterWithHF);
        initListener();
    }

    private void initData() {
        for (int i=0;i<10;i++){
            mList.add("數據"+i);
        }
    }

    private void initView() {
        mRecyclerView= (RecyclerView) findViewById(R.id.recycleView);
        mFrameLayout = (PtrClassicFrameLayout) findViewById(R.id.ptr_class);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

    }
    private void initListener() {
        mFrameLayout.setLastUpdateTimeRelateObject(this);//設置刷新支持時間
        mFrameLayout.setResistance(1.7f);
        mFrameLayout.setDurationToCloseHeader(1000);
        // 默認為false
        mFrameLayout.setPullToRefresh(false);
        // 默認為true
        mFrameLayout.setKeepHeaderWhenRefresh(true);
        //進入Activity就進行自動下拉刷新
        mFrameLayout.postDelayed(new Runnable() {
            @Override
            public void run() {
                mFrameLayout.autoRefresh();
            }
        }, 100);
        //下拉刷新
        mFrameLayout.setPtrHandler(new PtrDefaultHandler() {
            @Override
            public void onRefreshBegin(PtrFrameLayout frame) {
                mList.clear();
                initData();//模擬加載數據
                //模擬聯網，延遲更新數據
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        mAdapterWithHF.notifyDataSetChanged();//適配器更新數據
                        mFrameLayout.refreshComplete();//
                        mFrameLayout.setLoadMoreEnable(true);
                    }
                },1000);
            }
        });
        //上拉加載
        mFrameLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void loadMore() {
                //模擬網絡延遲
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        initData();//模擬加載數據
                        mAdapterWithHF.notifyDataSetChanged();
                        mFrameLayout.loadMoreComplete(true);
                    }
                },1000);
            }
        });
    }
}