探索SwipeRefreshLayout配合自定义ListView完成下拉刷新、滑到底部自动加载更多

   <p>在Android开发过程中经常需要实现上下拉刷新功能，Google推出的下拉刷新控件SwipeRefreshLayout（彩虹条），由于官方版本只有下拉刷新而没有上拉加载更多的功能，很多人也尝试在这个基础上进行改写。今天尝试一下使用SwipeRefreshLayout配合自定义ListView实现下拉刷新、滑到底部自动加载更多的功能。</p>    <p>效果图如下所示，在进入页面的时候加载自动刷新，滑到底部自动加载更多，当数据已经加载完成则显示已经加载完成，，否则上拉任可继续加载</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/7ba4392139fb885a06d9640051e146bb.gif"></p>    <p>先贴一下项目结构图吧，这样可能对于整个项目的了解会比较清晰一些</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/d139c3272c09e6b4f0a0ef6fd0965d4c.png"></p>    <p><strong>1.在效果图中我们可以看到在头部刷新时候的进度条ProgressBar的颜色本身是可以改变的，所以在color.xml中定义头部刷新时候的四种颜色，用于通过此颜色资源文件设置进度条动画的颜色</strong></p>    <pre>  <code class="language-java"><?xml version="1.0" encoding="utf-8"?>  <resources>      <!-- 灰色 -->      <color name="grey">#FF999999</color>      <!--头部刷新时候的四种颜色-->      <color name="refresh_color_1">#ff00ddff</color>      <color name="refresh_color_2">#ff99cc00</color>      <color name="refresh_color_3">#ffffbb33</color>      <color name="refresh_color_4">#ffff4444</color>  </resources></code></pre>    <p><strong>2.重写SwipeRefreshLayout下拉刷新控件</strong></p>    <pre>  <code class="language-java">package com.xiaolijuan.swiperefreshlayoutdome.widget;    import android.content.Context;  import android.content.res.Resources;  import android.support.v4.widget.SwipeRefreshLayout;  import android.util.AttributeSet;  import android.view.MotionEvent;    import com.xiaolijuan.swiperefreshlayoutdome.R;    /**   * 项目名称：SwipeRefreshLayoutDome   * 类描述：配合LoadMoreListView 完成下拉刷新、滑到底部自动加载更多   * 创建人：xiaolijuan   * 创建时间：2015/12/12 9:00   */  public class RefreshAndLoadMoreView extends SwipeRefreshLayout {      private LoadMoreListView mLoadMoreListView;        /**       * 构造方法，用于在布局文件中用到这个自定义SwipeRefreshLayout控件       * @param context       * @param attrs       */      public RefreshAndLoadMoreView(Context context, AttributeSet attrs) {          super(context, attrs);          Resources res = getResources();          //通过颜色资源文件设置进度动画的颜色资源          setColorSchemeColors(res.getColor(R.color.refresh_color_1),                  res.getColor(R.color.refresh_color_2),                  res.getColor(R.color.refresh_color_3),                  res.getColor(R.color.refresh_color_4));      }      public void setLoadMoreListView(LoadMoreListView mLoadMoreListView) {          this.mLoadMoreListView = mLoadMoreListView;      }        /**       * 触屏事件,如果ListView不为空且数据还在加载中，则继续加载直至完成加载才触摸此事件       * @param ev       * @return       */      @Override      public boolean onTouchEvent(MotionEvent ev) {          if (mLoadMoreListView != null && mLoadMoreListView.isLoading()) {              return false;          }          return super.onTouchEvent(ev);      }  }</code></pre>    <p><strong>3.在update_loading_progressbar.xml定义进度条旋转的动画效果，用于设置绘制不显示进度的进度条的Drawable对象</strong></p>    <pre>  <code class="language-java"><?xml version="1.0" encoding="utf-8"?>  <!--画面转移旋转动画效果：以组件的中点为中心顺时针从0度旋转到720度-->  <rotate xmlns:android="http://schemas.android.com/apk/res/android"      android:drawable="@mipmap/default_ptr_rotate_gray"      android:duration="700"      android:fromDegrees="0"      android:pivotX="50%"      android:pivotY="50%"      android:toDegrees="720" /></code></pre>    <p><strong>4.pull_to_load_footer.xml这是在ListView中载入的头部布局</strong></p>    <pre>  <code class="language-java"><?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:layout_gravity="center"      android:orientation="vertical">        <View style="@style/horizontalDivider" />        <LinearLayout          android:layout_width="match_parent"          android:layout_height="48dp"          android:gravity="center">            <ProgressBar              android:id="@+id/footer_progressbar"              android:layout_width="20dp"              android:layout_height="20dp"              android:layout_marginRight="8dp"              android:gravity="center"              android:indeterminateDrawable="@anim/update_loading_progressbar"              android:visibility="visible" />            <TextView              android:id="@+id/footer_hint_textview"              android:layout_width="wrap_content"              android:layout_height="wrap_content"              android:text="正在加载中"              android:textColor="#999999"              android:textSize="14dp" />      </LinearLayout>  </LinearLayout></code></pre>    <p><strong>5.重写ListView，用于配合RefreshAndLoadMoreView 完成下拉刷新、滑到底部自动加载更多</strong></p>    <pre>  <code class="language-java">package com.xiaolijuan.swiperefreshlayoutdome.widget;    import android.content.Context;  import android.util.AttributeSet;  import android.view.LayoutInflater;  import android.view.View;  import android.widget.AbsListView;  import android.widget.ListView;  import android.widget.ProgressBar;  import android.widget.TextView;    import com.xiaolijuan.swiperefreshlayoutdome.R;    /**   * 项目名称：SwipeRefreshLayoutDome   * 类描述：配合RefreshAndLoadMoreView 完成下拉刷新、滑到底部自动加载更多   * 创建人：xiaolijuan   * 创建时间：2015/12/12 9:02   */  public class LoadMoreListView extends ListView implements AbsListView.OnScrollListener {      private View rooterView;      private boolean isHaveMoreData = true;// 是否有更多数据(默认为有)      private ProgressBar progressBar;      private TextView tipContext;        private RefreshAndLoadMoreView mRefreshAndLoadMoreView;      private boolean isLoading = false;// 是否正在加载        private OnLoadMoreListener mOnLoadMoreListener;        public LoadMoreListView(Context context, AttributeSet attrs) {          super(context, attrs);          //动态载入底部布局          rooterView = LayoutInflater.from(context).inflate(                  R.layout.pull_to_load_footer, null);          progressBar = (ProgressBar) rooterView.findViewById(R.id.footer_progressbar);          tipContext = (TextView) rooterView.findViewById(R.id.footer_hint_textview);          //向listView的底部添加布局(此时当给listView设置Item点击事件的时候，默认不触发这个添加的布局的点击事件)          addFooterView(rooterView, null, false);          setOnScrollListener(this);      }        public void setRefreshAndLoadMoreView(RefreshAndLoadMoreView mRefreshAndLoadMoreView) {          this.mRefreshAndLoadMoreView = mRefreshAndLoadMoreView;      }        /**       * 设置是否还有更多数据       *       * @param isHaveMoreData       */      public void setHaveMoreData(boolean isHaveMoreData) {          this.isHaveMoreData = isHaveMoreData;          if (!isHaveMoreData) {              tipContext.setText("只有这么多啦");              progressBar.setVisibility(View.GONE);          } else {              tipContext.setText("正在加载");              progressBar.setVisibility(View.VISIBLE);          }      }        /**       * 加载完成       */      public void onLoadComplete() {          isLoading = false;      }        public boolean isLoading() {          return isLoading;      }        @Override      public void onScrollStateChanged(AbsListView view, int scrollState) {          if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {              if (view.getLastVisiblePosition() == view.getCount() - 1 && (mRefreshAndLoadMoreView != null &&                      !mRefreshAndLoadMoreView.isRefreshing()) && !isLoading && mOnLoadMoreListener != null && isHaveMoreData) {                  isLoading = true;                  mOnLoadMoreListener.onLoadMore();              }          }      }        @Override      public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {        }        /**       * 加载更多的监听       */      public static interface OnLoadMoreListener {          public void onLoadMore();      }        /**       * 设置加载监听       *       * @param mOnLoadMoreListener       */      public void setOnLoadMoreListener(OnLoadMoreListener mOnLoadMoreListener) {          this.mOnLoadMoreListener = mOnLoadMoreListener;      }  }</code></pre>    <p><strong>6.MyAdapter</strong></p>    <pre>  <code class="language-java">package com.xiaolijuan.swiperefreshlayoutdome.adapter;    import android.content.Context;  import android.view.View;  import android.view.ViewGroup;  import android.widget.BaseAdapter;  import android.widget.TextView;    import com.xiaolijuan.swiperefreshlayoutdome.R;    import java.util.List;    /**   * 项目名称：SwipeRefreshLayoutDome   * 类描述：适配器   * 创建人：xiaolijuan   * 创建时间：2015/12/12 22:09   */  public class MyAdapter extends BaseAdapter {      private Context context;      private List<String> mTitleArray;// 标题数组      private int layoutId;        /**       * 构造方法       * @param context 上下文对象       * @param mTitleArray 标题数组       * @param layoutId 布局Id       */      public MyAdapter(Context context, List<String> mTitleArray, int layoutId) {          this.context = context;          this.mTitleArray = mTitleArray;          this.layoutId = layoutId;      }        /**       * 获取Item总数       * @return       */      @Override      public int getCount() {          return mTitleArray.size();      }        /**       * 获取一个Item对象       * @param position       * @return       */      @Override      public Object getItem(int position) {          return mTitleArray.get(position);      }        /**       * 获取指定item的Id       * @param position       * @return       */      @Override      public long getItemId(int position) {          return position;      }        /**       * 绘制的内容均在此实现       * @param position position就是位置从0开始       * @param convertView convertView是Spinner中每一项要显示的view       * @param parent parent就是父窗体了，也就是ListView       * @return       */      @Override      public View getView(int position, View convertView, ViewGroup parent) {          View item = convertView != null ? convertView : View.inflate(context, layoutId, null);          TextView txt_name = (TextView) item.findViewById(R.id.txt_title);          txt_name.setText(mTitleArray.get(position));          return item;      }  }</code></pre>    <p><strong>7.具体代码，代码写的很详细</strong></p>    <pre>  <code class="language-java">package com.xiaolijuan.swiperefreshlayoutdome.activits;    import android.app.Activity;  import android.content.Context;  import android.os.Bundle;  import android.os.Handler;  import android.support.v4.widget.SwipeRefreshLayout;  import android.view.View;  import android.widget.AdapterView;  import android.widget.Toast;    import com.xiaolijuan.swiperefreshlayoutdome.R;  import com.xiaolijuan.swiperefreshlayoutdome.adapter.MyAdapter;  import com.xiaolijuan.swiperefreshlayoutdome.widget.LoadMoreListView;  import com.xiaolijuan.swiperefreshlayoutdome.widget.RefreshAndLoadMoreView;    import java.util.ArrayList;  import java.util.List;    /**   * 项目名称：SwipeRefreshLayoutDome   * 类描述：主界面   * 创建人：xiaolijuan   * 创建时间：2015/12/12 20:00   */  public class MainActivity extends Activity {      private Context mContext;      private int pageIndex = 0;      private MyAdapter adapter;      private LoadMoreListView mLoadMoreListView;      private RefreshAndLoadMoreView mRefreshAndLoadMoreView;      private List<String> datas = new ArrayList<String>();        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          mContext = this;          mLoadMoreListView = (LoadMoreListView) findViewById(R.id.load_more_list);          mRefreshAndLoadMoreView = (RefreshAndLoadMoreView) findViewById(R.id.refresh_and_load_more);          adapter = new MyAdapter(mContext, datas, R.layout.item_layout);          mLoadMoreListView.setAdapter(adapter);          initData();      }        private void initData() {          //程序开始就加载第一页数据          loadData(1);          mRefreshAndLoadMoreView.setLoadMoreListView(mLoadMoreListView);          mLoadMoreListView.setRefreshAndLoadMoreView(mRefreshAndLoadMoreView);          //设置下拉刷新监听          mRefreshAndLoadMoreView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {              @Override              public void onRefresh() {                  loadData(1);              }          });          //设置加载监听          mLoadMoreListView.setOnLoadMoreListener(new LoadMoreListView.OnLoadMoreListener() {              @Override              public void onLoadMore() {                  loadData(pageIndex + 1);              }          });          mLoadMoreListView.setOnItemClickListener(new ItemClickListener());      }          /**       * 加载数据       */      private void loadData(final int tempPageIndex) {          new Handler().postDelayed(new Runnable() {              @Override              public void run() {                  if (tempPageIndex == 1) {                      datas.clear();                  }                  getDatas(tempPageIndex);                  //在这里我设置当加载到第三页时设置已经加载完成                  if (tempPageIndex == 3) {                      mLoadMoreListView.setHaveMoreData(false);                  } else {                      mLoadMoreListView.setHaveMoreData(true);                  }                  pageIndex = tempPageIndex;                  adapter.notifyDataSetChanged();                  //当加载完成之后设置此时不在刷新状态                  mRefreshAndLoadMoreView.setRefreshing(false);                  mLoadMoreListView.onLoadComplete();              }          }, 1000);      }        /**       * 模拟一些数据源       *       * @return       */      private List<String> getDatas(final int tempPageIndex) {          switch (tempPageIndex) {              case 1:                  for (int i = 0; i < 10; i++) {                      datas.add("这是第" + (i + 1) + "个Item");                  }                  break;              case 2:                  for (int i = 0; i < 10; i++) {                      datas.add("这是第" + (i + 11) + "个Item");                  }                  break;              case 3:                  for (int i = 0; i < 10; i++) {                      datas.add("这是第" + (i + 21) + "个Item");                  }                  break;              default:                  break;          }            return datas;      }        /**       * 为ListView每个Item添加点击事件       */      public class ItemClickListener implements AdapterView.OnItemClickListener {            @Override          public void onItemClick(AdapterView<?> parent, View view, int position, long id) {              Toast.makeText(getApplicationContext(), datas.get(position), Toast.LENGTH_LONG).show();          }      }  }</code></pre>    <p> </p>    <p> </p>    <p> </p>    <p>来自：http://www.jianshu.com/p/305929729e4c</p>    <p> </p>