Android RecyclerView的刷新分页的实现

/**  * 初始化数据  * @return  */ public void initData(){  for (int i=0;i<30;i++){   arrayList.add("第"+i+"条数据");  } }  /**  * 线程模拟加载数据  */ class LoadDataThread extends Thread{  @Override  public void run() {   initData();   try {    Thread.sleep(2000);   } catch (InterruptedException e) {    e.printStackTrace();   }   //通知主线程更新数据   Message message = handler.obtainMessage();   message.what = UPDATE_DATA;   message.obj = arrayList;   handler.sendMessage(message);  } }

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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="com.manu.mrecyclerview.MainActivity"> <android.support.v7.widget.RecyclerView  android:id="@+id/rv"  android:layout_width="match_parent"  android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView></LinearLayout>

/**item.xml**/<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="5dp"> <TextView  android:id="@+id/tv_recycle"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:gravity="center_horizontal"  android:text="data"  android:background="#cac3c3"  android:padding="10dp"  android:textSize="20sp"/></LinearLayout>

/**item_footer.xml**/<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal"> <ProgressBar  style="?android:attr/progressBarStyleSmall"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/progressBar" /> <TextView  android:text="正在努力加载中，请稍后..."  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/textView" /></LinearLayout>

/** * Created by jzman on 2017/6/04 * RecycleView的Adapter */public class RvAdapter1 extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements  View.OnClickListener{ private static final int ITEM_FOOTER = 0x1; private static final int ITEM_DATA = 0x2; private Context mContext; private RecyclerView recyclerView; private ArrayList<String> mList; public RvAdapter1() {} public RvAdapter1(Context mContext, ArrayList<String> mList) {  this.mContext = mContext;  this.mList = mList; } public void setmList(ArrayList<String> mList) {  this.mList = mList; } /**  * 用于创建ViewHolder  * @param parent  * @param viewTypez  * @return  */ @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  View view ;  RecyclerView.ViewHolder vh = null;  switch (viewType){   case ITEM_DATA:    view = LayoutInflater.from(mContext).inflate(R.layout.item,null);    view.setOnClickListener(this);    vh = new DataViewHolder(view);    //使用代码设置宽高（xml布局设置无效时）    view.setLayoutParams(new ViewGroup.LayoutParams(      ViewGroup.LayoutParams.MATCH_PARENT,      ViewGroup.LayoutParams.WRAP_CONTENT));    break;   case ITEM_FOOTER:    view = LayoutInflater.from(mContext).inflate(R.layout.item_footer,null);    //使用代码设置宽高（xml布局设置无效时）    vh = new FooterViewHolder(view);    view.setLayoutParams(new ViewGroup.LayoutParams(      ViewGroup.LayoutParams.MATCH_PARENT,      ViewGroup.LayoutParams.WRAP_CONTENT));    break;  }  return vh; } /**  * 获取Item的View类型  * @param position  * @return  */ @Override public int getItemViewType(int position) {  //根据 Item 的 position 返回不同的 Viewtype  if (position == (getItemCount())-1){   return ITEM_FOOTER;  }else{   return ITEM_DATA;  } } /**  * 绑定数据  * @param holder  * @param position  */ @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {  if (holder instanceof DataViewHolder){   DataViewHolder dataViewHolder = (DataViewHolder) holder;   dataViewHolder.tv_data.setText(mList.get(position));  }else if (holder instanceof FooterViewHolder){  } } /**  * 选项总数  * @return  */ @Override public int getItemCount() {  return mList.size()+1; } @Override public void onClick(View view) {  //根据RecyclerView获得当前View的位置  int position = recyclerView.getChildAdapterPosition(view);  //程序执行到此，会去执行具体实现的onItemClick()方法  if (onItemClickListener!=null){   onItemClickListener.onItemClick(recyclerView,view,position,mList.get(position));  } } /**  * 创建ViewHolder  */ public static class DataViewHolder extends RecyclerView.ViewHolder{  TextView tv_data;  public DataViewHolder(View itemView) {   super(itemView);   tv_data = (TextView) itemView.findViewById(R.id.tv_recycle);  } } /**  * 创建footer的ViewHolder  */ public static class FooterViewHolder extends RecyclerView.ViewHolder{  public FooterViewHolder(View itemView) {   super(itemView);  } } private OnItemClickListener onItemClickListener; public void setOnItemClickListener(OnItemClickListener onItemClickListener){  this.onItemClickListener = onItemClickListener; } /**  * 定义RecyclerView选项单击事件的回调接口  */ public interface OnItemClickListener{  //参数（父组件，当前单击的View,单击的View的位置，数据）  void onItemClick(RecyclerView parent,View view, int position, String data); } /**  * 将RecycleView附加到Adapter上  */ @Override public void onAttachedToRecyclerView(RecyclerView recyclerView) {  super.onAttachedToRecyclerView(recyclerView);  this.recyclerView= recyclerView; } /**  * 将RecycleView从Adapter解除  */ @Override public void onDetachedFromRecyclerView(RecyclerView recyclerView) {  super.onDetachedFromRecyclerView(recyclerView);  this.recyclerView = null; }}

/** * Created by jzman on 2017/6/04 0013. */public class MainActivity extends AppCompatActivity { private static final int UPDATE_DATA = 0x3;  private RecyclerView rv; RvAdapter1 adapter; private ArrayList<String> arrayList = new ArrayList<>(); //加载更多数据时最后一项的索引 private int lastLoadDataItemPosition; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  rv = (RecyclerView) findViewById(R.id.rv);  //设置布局管理器  rv.setLayoutManager(new LinearLayoutManager(this));//线性//  rv.setLayoutManager(new GridLayoutManager(this,4));//线性//  rv.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL));//线性  initData();  adapter = new RvAdapter1(this,arrayList);  adapter.setOnItemClickListener(new RvAdapter1.OnItemClickListener() {   @Override   public void onItemClick(RecyclerView parent, View view, int position, String data) {    Toast.makeText(MainActivity.this, data, Toast.LENGTH_SHORT).show();   }  });  rv.addOnScrollListener(new OnScrollListener() {   @Override   public void onScrollStateChanged(RecyclerView recyclerView, int newState) {    if (newState == SCROLL_STATE_IDLE &&      lastLoadDataItemPosition == adapter.getItemCount()){     new LoadDataThread().start();    }   }   @Override   public void onScrolled(RecyclerView recyclerView, int dx, int dy) {    LayoutManager layoutManager = recyclerView.getLayoutManager();    if (layoutManager instanceof LinearLayoutManager){     LinearLayoutManager manager = (LinearLayoutManager) layoutManager;     int firstVisibleItem = manager.findFirstVisibleItemPosition();     int l = manager.findLastCompletelyVisibleItemPosition();     lastLoadDataItemPosition = firstVisibleItem+(l-firstVisibleItem)+1;    }   }  });  rv.setAdapter(adapter); } /**  * 初始化数据  * @return  */ public void initData(){  for (int i=0;i<25;i++){   arrayList.add("第"+i+"条数据");  } } /**  * 线程模拟加载数据  */ class LoadDataThread extends Thread{  @Override  public void run() {   initData();   try {    Thread.sleep(2000);   } catch (InterruptedException e) {    e.printStackTrace();   }   Message message = handler.obtainMessage();   message.what = UPDATE_DATA;   message.obj = arrayList;   handler.sendMessage(message);  } } private Handler handler = new Handler(){  @Override  public void handleMessage(Message msg) {   super.handleMessage(msg);   switch (msg.what){    case UPDATE_DATA:     arrayList = (ArrayList<String>) msg.obj;     adapter.setmList(arrayList);     adapter.notifyDataSetChanged();     break;   }  } };}