xlistview加载网页内容上拉刷新下拉加载

list_item.xml

xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/list_item_textview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="5dp"
    android:textColor="#000"
    android:textSize="16sp">


TextView>

xlistview_footer.xml

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <RelativeLayout
        android:id="@+id/xlistview_footer_content"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp" >

        <ProgressBar
            android:id="@+id/xlistview_footer_progressbar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:visibility="invisible" />

        <TextView
            android:id="@+id/xlistview_footer_hint_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="@string/xlistview_footer_hint_normal" />
    RelativeLayout>

LinearLayout>

xlistview_header.xml

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="bottom" >

    <RelativeLayout
        android:id="@+id/xlistview_header_content"
        android:layout_width="fill_parent"
        android:layout_height="60dp" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:orientation="vertical" android:id="@+id/xlistview_header_text">

            <TextView
                android:id="@+id/xlistview_header_hint_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/xlistview_header_hint_normal" />

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="3dp" >

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/xlistview_header_last_time"
                    android:textSize="12sp" />

                <TextView
                    android:id="@+id/xlistview_header_time"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="12sp" />
            LinearLayout>
        LinearLayout>

        <ImageView
            android:id="@+id/xlistview_header_arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@id/xlistview_header_text"
            android:layout_centerVertical="true"
            android:layout_marginLeft="-35dp"
            android:src="@drawable/xlistview_arrow" />

        <ProgressBar
            android:id="@+id/xlistview_header_progressbar"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_alignLeft="@id/xlistview_header_text"
            android:layout_centerVertical="true"
            android:layout_marginLeft="-40dp"
            android:visibility="invisible" />
    RelativeLayout>

LinearLayout>

strings.xml

<resources>
    <string name="app_name">Myupdownstring>
    <string name="xlistview_header_hint_normal">下拉刷新string>
    <string name="xlistview_header_hint_ready">松开刷新数据string>
    <string name="xlistview_header_hint_loading">正在加载...string>
    <string name="xlistview_header_last_time">上次更新时间：string>
    <string name="xlistview_footer_hint_normal">查看更多string>
    <string name="xlistview_footer_hint_ready">松开载入更多string>
resources>

activity_main.xml

xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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"
   >

    <fragment.bwie.com.myupdown.XListView
        android:id="@+id/xListView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:cacheColorHint="#00000000">

    fragment.bwie.com.myupdown.XListView>
RelativeLayout>

XListView

/**
 * @file XListView.java
 * @package me.maxwin.view
 * @create Mar 18, 2012 6:28:41 PM
 * @author Maxwin
 * @description An ListView support (a) Pull down to refresh, (b) Pull up to load more.
 *        Implement IXListViewListener, and see stopRefresh() / stopLoadMore().
 */

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.DecelerateInterpolator;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Scroller;
import android.widget.TextView;

public class XListView extends ListView implements OnScrollListener {

   private float mLastY = -1; // save event y
   private Scroller mScroller; // used for scroll back
   private OnScrollListener mScrollListener; // user's scroll listener

   // the interface to trigger refresh and load more.
   private IXListViewListener mListViewListener;

   // -- header view
   private XListViewHeader mHeaderView;
   // header view content, use it to calculate the Header's height. And hide it
   // when disable pull refresh.
   private RelativeLayout mHeaderViewContent;
   private TextView mHeaderTimeView;
   private int mHeaderViewHeight; // header view's height
   private boolean mEnablePullRefresh = true;
   private boolean mPullRefreshing = false; // is refreashing.

   // -- footer view
   private XListViewFooter mFooterView;
   private boolean mEnablePullLoad;
   private boolean mPullLoading;
   private boolean mIsFooterReady = false;
   
   // total list items, used to detect is at the bottom of listview.
   private int mTotalItemCount;

   // for mScroller, scroll back from header or footer.
   private int mScrollBack;
   private final static int SCROLLBACK_HEADER = 0;
   private final static int SCROLLBACK_FOOTER = 1;

   private final static int SCROLL_DURATION = 400; // scroll back duration
   private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px
                                          // at bottom, trigger
                                          // load more.
   private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
                                       // feature.

   /**
    * @param context
    */
   public XListView(Context context) {
      super(context);
      initWithContext(context);
   }

   public XListView(Context context, AttributeSet attrs) {
      super(context, attrs);
      initWithContext(context);
   }

   public XListView(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
      initWithContext(context);
   }

   private void initWithContext(Context context) {
      mScroller = new Scroller(context, new DecelerateInterpolator());
      // XListView need the scroll event, and it will dispatch the event to
      // user's listener (as a proxy).
      super.setOnScrollListener(this);

      // init header view
      mHeaderView = new XListViewHeader(context);
      mHeaderViewContent = (RelativeLayout) mHeaderView
            .findViewById(R.id.xlistview_header_content);
      mHeaderTimeView = (TextView) mHeaderView
            .findViewById(R.id.xlistview_header_time);
      addHeaderView(mHeaderView);

      // init footer view
      mFooterView = new XListViewFooter(context);

      // init header height
      mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
            new OnGlobalLayoutListener() {
               @Override
               public void onGlobalLayout() {
                  mHeaderViewHeight = mHeaderViewContent.getHeight();
                  getViewTreeObserver()
                        .removeGlobalOnLayoutListener(this);
               }
            });
   }

   @Override
   public void setAdapter(ListAdapter adapter) {
      // make sure XListViewFooter is the last footer view, and only add once.
      if (mIsFooterReady == false) {
         mIsFooterReady = true;
         addFooterView(mFooterView);
      }
      super.setAdapter(adapter);
   }

   /**
    * enable or disable pull down refresh feature.
    * 
    * @param enable
    */
   public void setPullRefreshEnable(boolean enable) {
      mEnablePullRefresh = enable;
      if (!mEnablePullRefresh) { // disable, hide the content
         mHeaderViewContent.setVisibility(View.INVISIBLE);
      } else {
         mHeaderViewContent.setVisibility(View.VISIBLE);
      }
   }

   /**
    * enable or disable pull up load more feature.
    * 
    * @param enable
    */
   public void setPullLoadEnable(boolean enable) {
      mEnablePullLoad = enable;
      if (!mEnablePullLoad) {
         mFooterView.hide();
         mFooterView.setOnClickListener(null);
         //make sure "pull up" don't show a line in bottom when listview with one page 
         setFooterDividersEnabled(false);
      } else {
         mPullLoading = false;
         mFooterView.show();
         mFooterView.setState(XListViewFooter.STATE_NORMAL);
         //make sure "pull up" don't show a line in bottom when listview with one page  
         setFooterDividersEnabled(true);
         // both "pull up" and "click" will invoke load more.
         mFooterView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
               startLoadMore();
            }
         });
      }
   }

   /**
    * stop refresh, reset header view.
    */
   public void stopRefresh() {
      if (mPullRefreshing == true) {
         mPullRefreshing = false;
         resetHeaderHeight();
      }
   }

   /**
    * stop load more, reset footer view.
    */
   public void stopLoadMore() {
      if (mPullLoading == true) {
         mPullLoading = false;
         mFooterView.setState(XListViewFooter.STATE_NORMAL);
      }
   }

   /**
    * set last refresh time
    * 
    * @param time
    */
   public void setRefreshTime(String time) {
      mHeaderTimeView.setText(time);
   }

   private void invokeOnScrolling() {
      if (mScrollListener instanceof OnXScrollListener) {
         OnXScrollListener l = (OnXScrollListener) mScrollListener;
         l.onXScrolling(this);
      }
   }

   private void updateHeaderHeight(float delta) {
      mHeaderView.setVisiableHeight((int) delta
            + mHeaderView.getVisiableHeight());
      if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头
         if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
            mHeaderView.setState(XListViewHeader.STATE_READY);
         } else {
            mHeaderView.setState(XListViewHeader.STATE_NORMAL);
         }
      }
      setSelection(0); // scroll to top each time
   }

   /**
    * reset header view's height.
    */
   private void resetHeaderHeight() {
      int height = mHeaderView.getVisiableHeight();
      if (height == 0) // not visible.
         return;
      // refreshing and header isn't shown fully. do nothing.
      if (mPullRefreshing && height <= mHeaderViewHeight) {
         return;
      }
      int finalHeight = 0; // default: scroll back to dismiss header.
      // is refreshing, just scroll back to show all the header.
      if (mPullRefreshing && height > mHeaderViewHeight) {
         finalHeight = mHeaderViewHeight;
      }
      mScrollBack = SCROLLBACK_HEADER;
      mScroller.startScroll(0, height, 0, finalHeight - height,
            SCROLL_DURATION);
      // trigger computeScroll
      invalidate();
   }

   private void updateFooterHeight(float delta) {
      int height = mFooterView.getBottomMargin() + (int) delta;
      if (mEnablePullLoad && !mPullLoading) {
         if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
                                       // more.
            mFooterView.setState(XListViewFooter.STATE_READY);
         } else {
            mFooterView.setState(XListViewFooter.STATE_NORMAL);
         }
      }
      mFooterView.setBottomMargin(height);

//    setSelection(mTotalItemCount - 1); // scroll to bottom
   }

   private void resetFooterHeight() {
      int bottomMargin = mFooterView.getBottomMargin();
      if (bottomMargin > 0) {
         mScrollBack = SCROLLBACK_FOOTER;
         mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,
               SCROLL_DURATION);
         invalidate();
      }
   }

   private void startLoadMore() {
      mPullLoading = true;
      mFooterView.setState(XListViewFooter.STATE_LOADING);
      if (mListViewListener != null) {
         mListViewListener.onLoadMore();
      }
   }

   @Override
   public boolean onTouchEvent(MotionEvent ev) {
      if (mLastY == -1) {
         mLastY = ev.getRawY();
      }

      switch (ev.getAction()) {
      case MotionEvent.ACTION_DOWN:
         mLastY = ev.getRawY();
         break;
      case MotionEvent.ACTION_MOVE:
         final float deltaY = ev.getRawY() - mLastY;
         mLastY = ev.getRawY();
         if (getFirstVisiblePosition() == 0
               && (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
            // the first item is showing, header has shown or pull down.
            updateHeaderHeight(deltaY / OFFSET_RADIO);
            invokeOnScrolling();
         } else if (getLastVisiblePosition() == mTotalItemCount - 1
               && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
            // last item, already pulled up or want to pull up.
            updateFooterHeight(-deltaY / OFFSET_RADIO);
         }
         break;
      default:
         mLastY = -1; // reset
         if (getFirstVisiblePosition() == 0) {
            // invoke refresh
            if (mEnablePullRefresh
                  && mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
               mPullRefreshing = true;
               mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
               if (mListViewListener != null) {
                  mListViewListener.onRefresh();
               }
            }
            resetHeaderHeight();
         } else if (getLastVisiblePosition() == mTotalItemCount - 1) {
            // invoke load more.
            if (mEnablePullLoad
                && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA
                && !mPullLoading) {
               startLoadMore();
            }
            resetFooterHeight();
         }
         break;
      }
      return super.onTouchEvent(ev);
   }

   @Override
   public void computeScroll() {
      if (mScroller.computeScrollOffset()) {
         if (mScrollBack == SCROLLBACK_HEADER) {
            mHeaderView.setVisiableHeight(mScroller.getCurrY());
         } else {
            mFooterView.setBottomMargin(mScroller.getCurrY());
         }
         postInvalidate();
         invokeOnScrolling();
      }
      super.computeScroll();
   }

   @Override
   public void setOnScrollListener(OnScrollListener l) {
      mScrollListener = l;
   }

   @Override
   public void onScrollStateChanged(AbsListView view, int scrollState) {
      if (mScrollListener != null) {
         mScrollListener.onScrollStateChanged(view, scrollState);
      }
   }

   @Override
   public void onScroll(AbsListView view, int firstVisibleItem,
         int visibleItemCount, int totalItemCount) {
      // send to user's listener
      mTotalItemCount = totalItemCount;
      if (mScrollListener != null) {
         mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
               totalItemCount);
      }
   }

   public void setXListViewListener(IXListViewListener l) {
      mListViewListener = l;
   }

   /**
    * you can listen ListView.OnScrollListener or this one. it will invoke
    * onXScrolling when header/footer scroll back.
    */
   public interface OnXScrollListener extends OnScrollListener {
      public void onXScrolling(View view);
   }

   /**
    * implements this interface to get refresh/load more event.
    */
   public interface IXListViewListener {
      public void onRefresh();

      public void onLoadMore();
   }
}

XListViewHeader

/**
 * @file XListViewHeader.java
 * @create Apr 18, 2012 5:22:27 PM
 * @author Maxwin
 * @description XListView's header
 */

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;

public class XListViewHeader extends LinearLayout {
   private LinearLayout mContainer;
   private ImageView mArrowImageView;
   private ProgressBar mProgressBar;
   private TextView mHintTextView;
   private int mState = STATE_NORMAL;

   private Animation mRotateUpAnim;
   private Animation mRotateDownAnim;
   
   private final int ROTATE_ANIM_DURATION = 180;
   
   public final static int STATE_NORMAL = 0;
   public final static int STATE_READY = 1;
   public final static int STATE_REFRESHING = 2;

   public XListViewHeader(Context context) {
      super(context);
      initView(context);
   }

   /**
    * @param context
    * @param attrs
    */
   public XListViewHeader(Context context, AttributeSet attrs) {
      super(context, attrs);
      initView(context);
   }

   private void initView(Context context) {
      // 初始情况，设置下拉刷新view高度为0
      LayoutParams lp = new LayoutParams(
            LayoutParams.FILL_PARENT, 0);
      mContainer = (LinearLayout) LayoutInflater.from(context).inflate(
            R.layout.xlistview_header, null);
      addView(mContainer, lp);
      setGravity(Gravity.BOTTOM);

      mArrowImageView = (ImageView)findViewById(R.id.xlistview_header_arrow);
      mHintTextView = (TextView)findViewById(R.id.xlistview_header_hint_textview);
      mProgressBar = (ProgressBar)findViewById(R.id.xlistview_header_progressbar);
      
      mRotateUpAnim = new RotateAnimation(0.0f, -180.0f,
            Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
            0.5f);
      mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION);
      mRotateUpAnim.setFillAfter(true);
      mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f,
            Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
            0.5f);
      mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION);
      mRotateDownAnim.setFillAfter(true);
   }

   public void setState(int state) {
      if (state == mState) return ;
      
      if (state == STATE_REFRESHING) {   // 显示进度
         mArrowImageView.clearAnimation();
         mArrowImageView.setVisibility(View.INVISIBLE);
         mProgressBar.setVisibility(View.VISIBLE);
      } else {   // 显示箭头图片
         mArrowImageView.setVisibility(View.VISIBLE);
         mProgressBar.setVisibility(View.INVISIBLE);
      }
      
      switch(state){
      case STATE_NORMAL:
         if (mState == STATE_READY) {
            mArrowImageView.startAnimation(mRotateDownAnim);
         }
         if (mState == STATE_REFRESHING) {
            mArrowImageView.clearAnimation();
         }
         mHintTextView.setText(R.string.xlistview_header_hint_normal);
         break;
      case STATE_READY:
         if (mState != STATE_READY) {
            mArrowImageView.clearAnimation();
            mArrowImageView.startAnimation(mRotateUpAnim);
            mHintTextView.setText(R.string.xlistview_header_hint_ready);
         }
         break;
      case STATE_REFRESHING:
         mHintTextView.setText(R.string.xlistview_header_hint_loading);
         break;
         default:
      }
      
      mState = state;
   }
   
   public void setVisiableHeight(int height) {
      if (height < 0)
         height = 0;
      LayoutParams lp = (LayoutParams) mContainer
            .getLayoutParams();
      lp.height = height;
      mContainer.setLayoutParams(lp);
   }

   public int getVisiableHeight() {
      return mContainer.getLayoutParams().height;
   }

}

XListViewFooter

/**
 * @file XFooterView.java
 * @create Mar 31, 2012 9:33:43 PM
 * @author Maxwin
 * @description XListView's footer
 */

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class XListViewFooter extends LinearLayout {
   public final static int STATE_NORMAL = 0;
   public final static int STATE_READY = 1;
   public final static int STATE_LOADING = 2;

   private Context mContext;

   private View mContentView;
   private View mProgressBar;
   private TextView mHintView;
   
   public XListViewFooter(Context context) {
      super(context);
      initView(context);
   }
   
   public XListViewFooter(Context context, AttributeSet attrs) {
      super(context, attrs);
      initView(context);
   }

   
   public void setState(int state) {
      mHintView.setVisibility(View.INVISIBLE);
      mProgressBar.setVisibility(View.INVISIBLE);
      mHintView.setVisibility(View.INVISIBLE);
      if (state == STATE_READY) {
         mHintView.setVisibility(View.VISIBLE);
         mHintView.setText(R.string.xlistview_footer_hint_ready);
      } else if (state == STATE_LOADING) {
         mProgressBar.setVisibility(View.VISIBLE);
      } else {
         mHintView.setVisibility(View.VISIBLE);
         mHintView.setText(R.string.xlistview_footer_hint_normal);
      }
   }
   
   public void setBottomMargin(int height) {
      if (height < 0) return ;
      LayoutParams lp = (LayoutParams)mContentView.getLayoutParams();
      lp.bottomMargin = height;
      mContentView.setLayoutParams(lp);
   }
   
   public int getBottomMargin() {
      LayoutParams lp = (LayoutParams)mContentView.getLayoutParams();
      return lp.bottomMargin;
   }
   
   
   /**
    * normal status
    */
   public void normal() {
      mHintView.setVisibility(View.VISIBLE);
      mProgressBar.setVisibility(View.GONE);
   }
   
   
   /**
    * loading status 
    */
   public void loading() {
      mHintView.setVisibility(View.GONE);
      mProgressBar.setVisibility(View.VISIBLE);
   }
   
   /**
    * hide footer when disable pull load more
    */
   public void hide() {
      LayoutParams lp = (LayoutParams)mContentView.getLayoutParams();
      lp.height = 0;
      mContentView.setLayoutParams(lp);
   }
   
   /**
    * show footer
    */
   public void show() {
      LayoutParams lp = (LayoutParams)mContentView.getLayoutParams();
      lp.height = LayoutParams.WRAP_CONTENT;
      mContentView.setLayoutParams(lp);
   }
   
   private void initView(Context context) {
      mContext = context;
      LinearLayout moreView = (LinearLayout)LayoutInflater.from(mContext).inflate(R.layout.xlistview_footer, null);
      addView(moreView);
      moreView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
      
      mContentView = moreView.findViewById(R.id.xlistview_footer_content);
      mProgressBar = moreView.findViewById(R.id.xlistview_footer_progressbar);
      mHintView = (TextView)moreView.findViewById(R.id.xlistview_footer_hint_textview);
   }
   
   
}

MainActivity

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast;

import com.google.gson.Gson;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener {
    private XListView xListView;
    //操作数据的集合
    private List list = new ArrayList<>();
    private int NUM = 10;
    private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        xListView = (XListView) findViewById(R.id.xListView);
        xListView.setPullRefreshEnable(true);
        xListView.setPullLoadEnable(true);
        //设置监听事件
        xListView.setXListViewListener(this);
        new My().execute();
    }

    class My extends AsyncTask {

        @Override
        protected Object doInBackground(Object[] objects) {
            String string = "";
            String path = "http://gank.io/api/data/Android/10/" + NUM;
            try {
                URL url = new URL(path);
                HttpURLConnection con = (HttpURLConnection) url.openConnection();
//                con.setConnectTimeout(5000);
//                con.setReadTimeout(5000);
                int code = con.getResponseCode();
                if (code == 200) {
                    InputStream is = con.getInputStream();
                    byte[] b = new byte[1024];
                    int l = 0;
                    while ((l = is.read(b)) != -1) {
                        String str = new String(b, 0, l);
                        string += str;
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return string;
        }

        @Override
        protected void onPostExecute(Object o) {
            super.onPostExecute(o);
            Gson gson = new Gson();
            DataDataBean dataDataBean = gson.fromJson((String) o, DataDataBean.class);

            //dataDataBean.getResults();
            //将这次的十条数据添加到集合
            list.addAll(dataDataBean.getResults());
            if (adapter == null) {
                adapter = new MyAdapter();
                xListView.setAdapter(adapter);
            } else {
                adapter.notifyDataSetChanged();
            }
            xListView.stopLoadMore();
        }
    }

    @Override
    public void onRefresh() {

        NUM--;
        if (NUM > 0) {
            AsyncTask asyncTask = new AsyncTask() {
                @Override
                protected String doInBackground(Void... voids) {
                    String string = "";
                    String path = "http://gank.io/api/data/Android/10/" + NUM;
                    try {
                        URL url = new URL(path);
                        HttpURLConnection con = (HttpURLConnection) url.openConnection();
                        con.setConnectTimeout(5000);
                        con.setReadTimeout(5000);
                        int code = con.getResponseCode();
                        if (code == 200) {
                            InputStream is = con.getInputStream();
                            byte[] b = new byte[1024];
                            int l = 0;
                            while ((l = is.read(b)) != -1) {
                                String str = new String(b, 0, l);
                                string += str;
                            }
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    return string;
                }

                @Override
                protected void onPostExecute(String s) {
                    super.onPostExecute(s);
                    Gson gson = new Gson();
                    DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);

                    //dataDataBean.getResults();
                    //数据要添加到集合的最前边

                    list.addAll(0,dataDataBean.getResults());
                    if (adapter == null) {
                        adapter = new MyAdapter();
                        xListView.setAdapter(adapter);
                    } else {
                        adapter.notifyDataSetChanged();
                    }
                    xListView.stopRefresh();
                    Date date = new Date(System.currentTimeMillis());
                    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");
                    String time = simpleDateFormat.format(date);
                    xListView.setRefreshTime(time);
                }
            };
            asyncTask.execute();
        } else {
            Toast.makeText(MainActivity.this, "没有最新数据了", Toast.LENGTH_SHORT).show();
            xListView.stopRefresh();
        }
    }

    @Override
    public void onLoadMore() {
        NUM++;
        new My().execute();
    }

    class MyAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int i) {
            return list.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            if (view == null){
                view = View.inflate(MainActivity.this,R.layout.list_item,null);
            }
            TextView textView = view.findViewById(R.id.list_item_textview);
            textView.setText(list.get(i).getDesc());
            return view;
        }
    }
}

DataDataBean

import java.util.List;

/**
 * @author Dash
 * @date 2017/9/7
 * @description:
 */
public class DataDataBean {

    /**
     * error : false
     * results : [{"_id":"5969a267421aa90ca209c46a","createdAt":"2017-07-15T13:04:39.224Z","desc":"Android源码完全解析\u2014\u2014View的Measure过程","publishedAt":"2017-07-21T12:39:43.370Z","source":"web","type":"Android","url":"http://www.jianshu.com/p/4a68f9dc8f7c","used":true,"who":null},{"_id":"5971719e421aa97de5c7c97d","createdAt":"2017-07-21T11:14:38.609Z","desc":"一款非常漂亮的 Material Design 风格的音乐播放器！超棒！","images":["http://img.gank.io/9f05efe7-3196-4de4-af65-24e0a919a584"],"publishedAt":"2017-07-21T12:39:43.370Z","source":"chrome","type":"Android","url":"https://github.com/aliumujib/Orin","used":true,"who":"代码家"},{"_id":"59701bf6421aa90c9203d3c9","createdAt":"2017-07-20T10:56:54.503Z","desc":"自定义View之渐变圆环进度条","publishedAt":"2017-07-20T15:11:16.10Z","source":"web","type":"Android","url":"https://mp.weixin.qq.com/s?__biz=MzIwMzYwMTk1NA==&mid=2247485843&idx=1&sn=d5de05fc0240be0527de8d69b1616c6f&chksm=96cda8dea1ba21c8ba3c620acc07c2ef1e2afc619928587ac8201958af1eb4d3568f6516e4ac#rd","used":true,"who":"陈宇明"},{"_id":"5970415f421aa90ca3bb6b40","createdAt":"2017-07-20T13:36:31.736Z","desc":"又一个漂亮的 Android 日历组件。","images":["http://img.gank.io/20ad8aae-6740-4695-ad14-12080649690b"],"publishedAt":"2017-07-20T15:11:16.10Z","source":"chrome","type":"Android","url":"https://github.com/MagicMashRoom/SuperCalendar","used":true,"who":"代码家"},{"_id":"5953c796421aa90ca3bb6a79","createdAt":"2017-06-28T23:13:26.286Z","desc":"仿Google Play商店沉侵式样式","publishedAt":"2017-07-19T13:23:20.375Z","source":"chrome","type":"Android","url":"https://github.com/matrixxun/ImmersiveDetailSample","used":true,"who":"Jason"},{"_id":"5954ec49421aa90cb4724b46","createdAt":"2017-06-29T20:02:17.90Z","desc":"Marvelous sliding square loader view inspired this Design All items has same gradient and it changing on depending items position","publishedAt":"2017-07-19T13:23:20.375Z","source":"web","type":"Android","url":"https://github.com/steelkiwi/SlidingSquareLoaderView","used":true,"who":"Gavryschuk Yaroslav"},{"_id":"596875ad421aa90c9203d396","createdAt":"2017-07-14T15:41:33.580Z","desc":"emoji 官方兼容库","images":["http://img.gank.io/e52126cf-77e4-4a3b-9eb9-b62753d1d99b"],"publishedAt":"2017-07-19T13:23:20.375Z","source":"chrome","type":"Android","url":"https://developer.android.com/topic/libraries/support-library/preview/emoji-compat.html","used":true,"who":"Dear宅学长"},{"_id":"596c7e73421aa97de5c7c94d","createdAt":"2017-07-17T17:08:03.953Z","desc":"一个强大的selector注入器","images":["http://img.gank.io/6a435d6c-fd07-4f6b-9afe-5a061208540c"],"publishedAt":"2017-07-19T13:23:20.375Z","source":"chrome","type":"Android","url":"https://github.com/tianzhijiexian/SelectorInjection","used":true,"who":"galois"},{"_id":"596dd370421aa90c9203d3b5","createdAt":"2017-07-18T17:22:56.450Z","desc":"new method to build data in RecyclerView with Kotlin!","publishedAt":"2017-07-19T13:23:20.375Z","source":"web","type":"Android","url":"https://github.com/Werb/MoreType","used":true,"who":"Werb"},{"_id":"596e0e30421aa90ca3bb6b2b","createdAt":"2017-07-18T21:33:36.768Z","desc":"在Android Studio 中使用Git","publishedAt":"2017-07-19T13:23:20.375Z","source":"web","type":"Android","url":"http://tikitoo.github.io/2017/07/06/android-studio-use-git/","used":true,"who":"Tikitoo"}]
     */

    private boolean error;
    private List results;

    public boolean isError() {
        return error;
    }

    public void setError(boolean error) {
        this.error = error;
    }

    public List getResults() {
        return results;
    }

    public void setResults(List results) {
        this.results = results;
    }

    public static class ResultsBean {
        /**
         * _id : 5969a267421aa90ca209c46a
         * createdAt : 2017-07-15T13:04:39.224Z
         * desc : Android源码完全解析——View的Measure过程
         * publishedAt : 2017-07-21T12:39:43.370Z
         * source : web
         * type : Android
         * url : http://www.jianshu.com/p/4a68f9dc8f7c
         * used : true
         * who : null
         * images : ["http://img.gank.io/9f05efe7-3196-4de4-af65-24e0a919a584"]
         */

        private String _id;
        private String createdAt;
        private String desc;
        private String publishedAt;
        private String source;
        private String type;
        private String url;
        private boolean used;
        private Object who;
        private List images;

        public String get_id() {
            return _id;
        }

        public void set_id(String _id) {
            this._id = _id;
        }

        public String getCreatedAt() {
            return createdAt;
        }

        public void setCreatedAt(String createdAt) {
            this.createdAt = createdAt;
        }

        public String getDesc() {
            return desc;
        }

        public void setDesc(String desc) {
            this.desc = desc;
        }

        public String getPublishedAt() {
            return publishedAt;
        }

        public void setPublishedAt(String publishedAt) {
            this.publishedAt = publishedAt;
        }

        public String getSource() {
            return source;
        }

        public void setSource(String source) {
            this.source = source;
        }

        public String getType() {
            return type;
        }

        public void setType(String type) {
            this.type = type;
        }

        public String getUrl() {
            return url;
        }

        public void setUrl(String url) {
            this.url = url;
        }

        public boolean isUsed() {
            return used;
        }

        public void setUsed(boolean used) {
            this.used = used;
        }

        public Object getWho() {
            return who;
        }

        public void setWho(Object who) {
            this.who = who;
        }

        public List getImages() {
            return images;
        }

        public void setImages(List images) {
            this.images = images;
        }
    }
}

AndroidManifest.xml

xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   >
<uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
    application>

manifest>