开源项目PullToRefresh详解（四）——PullToRefreshListView和ViewPager的结合使用

来源：互联网发布：linux 多线程 connect 编辑：程序博客网时间：2024/05/16 13:03

　　其实这个不是什么新东西了，在介绍（一）中我们就知道了PullToRefreshListView的用法，这里只要将其放入到ViewPager中就行啦。ViewPager还是和以往一样的定义和使用，在适配器中存视图的时候放入PullToRefreshListView就行。

1.ViewPager的布局文件

activity_main.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="fill_parent"    android:orientation="vertical"     android:background="#000000">    <!-- The PullToRefreshListView replaces a standard ListView widget. -->    <android.support.v4.view.ViewPager        android:id="@+id/vp_list"        android:layout_width="fill_parent"        android:layout_height="fill_parent" /></LinearLayout>

2.找到ViewPager并设置适配器

private void initViewPager() {        // TODO 自动生成的方法存根        mViewPager = (ViewPager) findViewById(R.id.vp_list);        //得到设置好的view列表        ArrayList<View> viewList = setListViewInVp();        mViewPager.setAdapter(new ListViewPagerAdapter(viewList));    }

适配器：

    /**     * @author:Jack Tony     * @tips  :viewPager的适配器     * @date  :2014-10-14     */    public class ListViewPagerAdapter extends PagerAdapter {        //设置list数组，传入view        private ArrayList<View> mViewList;        private int pagerNum = 0;        public ListViewPagerAdapter(ArrayList<View> viewList) {            mViewList = viewList;        }        public int getPagerNum() {            return pagerNum;        }        @Override        public int getCount() {            return mViewList.size();        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view == object;        }        @Override        public void destroyItem(View arg0, int position, Object object) {            if (mViewList.get(position) != null) {                ((ViewPager) arg0).removeView(mViewList.get(position));            }        }        @Override        public Object instantiateItem(View container, int position) {            try {                if (mViewList.get(position).getParent() == null) {                    ((ViewPager) container).addView(mViewList.get(position), 0);                } else {                    /*                     * 很难理解新添加进来的view会自动绑定一个父类，由于一个儿子view不能与两个父类相关，                     * 所以得解绑不这样做否则会产生 viewpager java.lang.IllegalStateException:                     * The specified child already has a parent. You must call                     * removeView() on the child's parent first.                     */                    ((ViewGroup) mViewList.get(position).getParent())                            .removeView(mViewList.get(position));                    ((ViewPager) container).addView(mViewList.get(position), 0);                }            } catch (Exception e) {                e.printStackTrace();            } finally {                pagerNum = position;            }            return mViewList.get(position);        }    }

3.开始设置要放入viewPager中的listView

布局文件：

layout_listview_in_viewpager.xml

<?xml version="1.0" encoding="utf-8"?><com.handmark.pulltorefresh.library.PullToRefreshListView     xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:ptr="http://schemas.android.com/apk/res-auto"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ptr:ptrHeaderBackground="@android:color/darker_gray" />

java代码：

    private ArrayList<View> setListViewInVp() {        //设置给viewpager中填充的view列表        ArrayList<View> viewList = new ArrayList<View>();        //将string数组放入适配器中        final String[] data = { "1", "2", "3","4", "5", "6", "7", "8", "9", "10", "11",            "12", "13", "14", "15", "16", "17","18", "19", "20",  };        ListAdapter adapter = new ArrayAdapter<String>(getApplicationContext(),                 android.R.layout.simple_list_item_1, data);                //找到listView的布局，生成可以下拉刷新的listView，添加到视图列表中        LayoutInflater inflater = LayoutInflater.from(getApplication());        for (int i = 0; i < 4; i++) {            PullToRefreshListView plv = (PullToRefreshListView) inflater.inflate(                    R.layout.layout_listview_in_viewpager,  null);            plv.setAdapter(adapter);            plv.setOnRefreshListener(new OnRefreshListener<ListView>() {                @Override                public void onRefresh(PullToRefreshBase<ListView> refreshView) {                    // TODO 自动生成的方法存根                    new GetDataTask(refreshView).execute();                }            });                        viewList.add(plv);        }        return viewList;    }

4.定义异步任务

    private static class GetDataTask extends AsyncTask<Void, Void, Void> {        PullToRefreshBase<?> mRefreshedView;        public GetDataTask(PullToRefreshBase<?> refreshedView) {            mRefreshedView = refreshedView;        }        @Override        protected Void doInBackground(Void... params) {            // Simulates a background job.            try {                Thread.sleep(2000);            } catch (InterruptedException e) {            }            return null;        }        @Override        protected void onPostExecute(Void result) {            mRefreshedView.onRefreshComplete();            super.onPostExecute(result);        }    }

MainActivity.java的全部代码

package com.example.ptrlistviewinviewpagertest;import java.util.ArrayList;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ListAdapter;import android.widget.ListView;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;import com.handmark.pulltorefresh.library.PullToRefreshListView;public class MainActivity extends Activity {        private ViewPager mViewPager;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                initView();    }    private void initView() {        // TODO 自动生成的方法存根        initViewPager();    }    private void initViewPager() {        // TODO 自动生成的方法存根        mViewPager = (ViewPager) findViewById(R.id.vp_list);        //得到设置好的view列表        ArrayList<View> viewList = setListViewInVp();        mViewPager.setAdapter(new ListViewPagerAdapter(viewList));    }        private ArrayList<View> setListViewInVp() {        //设置给viewpager中填充的view列表        ArrayList<View> viewList = new ArrayList<View>();        //将string数组放入适配器中        final String[] data = { "1", "2", "3","4", "5", "6", "7", "8", "9", "10", "11",            "12", "13", "14", "15", "16", "17","18", "19", "20",  };        ListAdapter adapter = new ArrayAdapter<String>(getApplicationContext(),                 android.R.layout.simple_list_item_1, data);                //找到listView的布局，生成可以下拉刷新的listView，添加到视图列表中        LayoutInflater inflater = LayoutInflater.from(getApplication());        for (int i = 0; i < 4; i++) {            PullToRefreshListView plv = (PullToRefreshListView) inflater.inflate(                    R.layout.layout_listview_in_viewpager,  null);            plv.setAdapter(adapter);            plv.setOnRefreshListener(new OnRefreshListener<ListView>() {                @Override                public void onRefresh(PullToRefreshBase<ListView> refreshView) {                    // TODO 自动生成的方法存根                    new GetDataTask(refreshView).execute();                }            });                        viewList.add(plv);        }        return viewList;    }        /**     * @author:Jack Tony     * @tips  :viewPager的适配器     * @date  :2014-10-14     */    public class ListViewPagerAdapter extends PagerAdapter {        //设置list数组，传入view        private ArrayList<View> mViewList;        private int pagerNum = 0;        public ListViewPagerAdapter(ArrayList<View> viewList) {            mViewList = viewList;        }        public int getPagerNum() {            return pagerNum;        }        @Override        public int getCount() {            return mViewList.size();        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view == object;        }        @Override        public void destroyItem(View arg0, int position, Object object) {            if (mViewList.get(position) != null) {                ((ViewPager) arg0).removeView(mViewList.get(position));            }        }        @Override        public Object instantiateItem(View container, int position) {            try {                if (mViewList.get(position).getParent() == null) {                    ((ViewPager) container).addView(mViewList.get(position), 0);                } else {                    /*                     * 很难理解新添加进来的view会自动绑定一个父类，由于一个儿子view不能与两个父类相关，                     * 所以得解绑不这样做否则会产生 viewpager java.lang.IllegalStateException:                     * The specified child already has a parent. You must call                     * removeView() on the child's parent first.                     */                    ((ViewGroup) mViewList.get(position).getParent())                            .removeView(mViewList.get(position));                    ((ViewPager) container).addView(mViewList.get(position), 0);                }            } catch (Exception e) {                e.printStackTrace();            } finally {                pagerNum = position;            }            return mViewList.get(position);        }    }        private static class GetDataTask extends AsyncTask<Void, Void, Void> {        PullToRefreshBase<?> mRefreshedView;        public GetDataTask(PullToRefreshBase<?> refreshedView) {            mRefreshedView = refreshedView;        }        @Override        protected Void doInBackground(Void... params) {            // Simulates a background job.            try {                Thread.sleep(2000);            } catch (InterruptedException e) {            }            return null;        }        @Override        protected void onPostExecute(Void result) {            mRefreshedView.onRefreshComplete();            super.onPostExecute(result);        }    }}

源码下载：http://download.csdn.net/detail/shark0017/8036901

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