第三方开源库：Android-PullToRefresh-master简单使用

目的：实现上拉加载更多和下拉刷新并添加HeadView。

效果图：

实现listView的刷新的步骤：

准备工作：添加依赖库，PullToRefresh的库文件名称是：“libray”，可以直接改成改成PullToRefreshLibrary

1 创建PullToRefreshListView对象
2 设置PullToRefreshListView ：模式（Mode）+添加监听
3 根据PullToRefreshListView对象得到普通的ListViw并设置adapter

1 代码：MainActivity.java

package com.baidu.pulltorefreshdemo01;import java.util.ArrayList;import java.util.List;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;import com.handmark.pulltorefresh.library.PullToRefreshListView;import android.os.Bundle;import android.os.Handler;import android.os.SystemClock;import android.app.Activity;import android.content.Context;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends Activity {    List<String> list = new ArrayList<String>();    private MyAdapter adapter;    private PullToRefreshListView refreshListView;    public Context context = this;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        refreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);        refreshListView.setMode(Mode.BOTH);        refreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {            @Override            public void onRefresh(final PullToRefreshBase<ListView> refreshView) {                if (refreshView.getCurrentMode() == Mode.PULL_FROM_START) {// 下拉刷新                    //方法一：正确：                    new Handler().post(new Runnable() {                        @Override                        public void run() {                            refreshView.onRefreshComplete();// 刷新完成                        }                    });                    /**                     * pulltorefresh的监听中调用activity的runOnUiThread(..)是无效的，图标不会缩回，                     * 但是先开子线程，在子线程中调用runOnUiThread(..)是可以的，即下面情况。                     */                    //错误：图标不会缩回，headView依然存在。//                  ((Activity) context).runOnUiThread(new Runnable() {////                      @Override//                      public void run() {//                          refreshView.onRefreshComplete();// 刷新完成//                      }//                  });                    //方法二：正确//                  new  Thread(new Runnable() {//                      @Override//                      public void run() {//                          runOnUiThread(new Runnable() {//                              public void run() {//                                  refreshView.onRefreshComplete();// 刷新完成//                              }//                          });//                      }//                  }).start();                } else {// 上拉加载数据                    loadData();                }            }        });        ListView listView = refreshListView.getRefreshableView();        ImageView iv = new ImageView(this);        iv.setImageResource(R.drawable.ic_launcher);        listView.addHeaderView(iv);        adapter = new MyAdapter();        listView.setAdapter(adapter);    }    private void initData() {        for (int i = 0; i < 10; i++) {            list.add("item---" + i);        }    }    // 上拉加载数据    protected void loadData() {        new Thread() {            public void run() {                SystemClock.sleep(1000);                for (int i = 0; i < 10; i++) {                    list.add("item---" + list.size());                }                runOnUiThread(new Runnable() {                    public void run() {                        adapter.notifyDataSetChanged();                        refreshListView.onRefreshComplete();                    }                });            };        }.start();    }    class MyAdapter extends BaseAdapter {        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int position) {            return list.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            TextView tv = new TextView(MainActivity.this);            tv.setText(list.get(position));            tv.setHeight((int) (MainActivity.this).getResources().getDimension(                    R.dimen.main_activity_item_height));            return tv;        }    }}

2 布局：

2-1：activity_main.xml

<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"        tools:context=".MainActivity" >     <com.handmark.pulltorefresh.library.PullToRefreshListView          android:id="@+id/pull_refresh_list"            android:layout_width="fill_parent"            android:layout_height="fill_parent"            android:cacheColorHint="#00000000"            android:divider="#19000000"            android:dividerHeight="4dp"            android:fadingEdge="none"            android:fastScrollEnabled="false"            android:footerDividersEnabled="false"            android:headerDividersEnabled="false"            android:smoothScrollbar="true"/>    </RelativeLayout>

3注意事项

1 判断是上拉还是下拉的方法是getCurrentMode()不是getMode()2 刷新时添加数据后要调用下面2个方法，而且都需要在主线程中执行，但不可以直接调用runOnUiThread(){...}，必须先开子线程，在其run（）里面调用runOnUiThread(...)。当然，也可以用handler.post(new runnable{ ...runOnUiThread(..)})

adapter.notifyDataSetChanged();   //通知adapter更新refreshListView.onRefreshComplete();//刷新监听停止

3 如果需要更改刷新图标，需要到依赖库修改：pullToRefreshLibary中drawable的图标见下图：

default_ptr_flip.png：

default_ptr_rotate.png：

indicator_arrow.png：

点击下载源码：bin目录中有apk