Android PullToRefresh （GridView 下拉刷新上拉加载）

2023-08-09 12:23:58

做这个需要自己去git hub上下载个pull-to-refresh 里面有个library为依赖包自己导到自己的项目中

（下载地址：https://github.com/chrisbanes/Android-PullToRefresh）

activity_main.xml

Android PullToRefresh （GridView 下拉刷新上拉加载）

<?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" >

    <!-- The PullToRefreshGridView replaces a standard GridView widget. -->

    <com.handmark.pulltorefresh.library.PullToRefreshGridView

        xmlns:ptr="http://schemas.android.com/apk/res-auto"

        android:id="@+id/pull_refresh_grid"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:numColumns="2"

        ptr:ptrDrawable="@drawable/ic_launcher"

        ptr:ptrMode="both" />

</LinearLayout>

我们添加了一个属性：ptr:ptrMode="both" ，意思：上拉和下拉都支持。

可选值为：disabled（禁用下拉刷新），pullFromStart（仅支持下拉刷新），pullFromEnd（仅支持上拉刷新），both（二者都支持），manualOnly（只允许手动触发）

gridview中item布局

gridview.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <ImageView

        android:id="@+id/image_src"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:src="@drawable/ic_launcher" />

    <TextView

        android:id="@+id/text_title"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/image_src"

        android:text="TextView" />

</RelativeLayout>

MainActivity.java

package com.bawei.myxgridview;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.AsyncTask;

import android.os.Bundle;

import android.text.format.DateUtils;

import android.util.Log;

import android.widget.BaseAdapter;

import android.widget.GridView;

import com.bawei.vo.Good;

import com.bawei.vo.MyData;

import com.google.gson.Gson;

import com.handmark.pulltorefresh.library.PullToRefreshBase;

import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;

import com.handmark.pulltorefresh.library.PullToRefreshGridView;

public class MainActivity extends Activity {

    private PullToRefreshGridView mPullRefreshListView;

    // 网址

    private String URL = "http://api.expoon.com/AppNews/getNewsList/type/1/p/";

    List<MyData> list = new ArrayList<MyData>();

    private BaseAdapter adapter;

    int z = 10;

    int p = 10;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // 找控件

        mPullRefreshListView = (PullToRefreshGridView) findViewById(R.id.pull_refresh_grid);

        // 刚进入初次加载

        new GetDataTask().execute(URL + z);

        // 监听

        mPullRefreshListView

                .setOnRefreshListener(new OnRefreshListener2<GridView>() {

                    // 下拉刷新加载

                    @Override

                    public void onPullDownToRefresh(

                            PullToRefreshBase<GridView> refreshView) {

                        Log.e("TAG", "onPullDownToRefresh"); // Do work to

                        // 刷新时间

                        String label = DateUtils.formatDateTime(

                                getApplicationContext(),

                                System.currentTimeMillis(),

                                DateUtils.FORMAT_SHOW_TIME

                                        | DateUtils.FORMAT_SHOW_DATE

                                        | DateUtils.FORMAT_ABBREV_ALL);

                        // Update the LastUpdatedLabel

                        refreshView.getLoadingLayoutProxy()

                                .setLastUpdatedLabel(label);

                        // 页数

                        z = z - 1;

                        // AsyncTask异步交互加载数据

                        new GetDataTask().execute(URL + z);

                    }

                    // 上拉加载跟多

                    @Override

                    public void onPullUpToRefresh(

                            PullToRefreshBase<GridView> refreshView) {

                        Log.e("TAG", "onPullUpToRefresh"); // Do work to refresh

                        // 页数

                        p = p + 1;

                        // AsyncTask异步交互加载数据

                        new GetDataTask2().execute(URL + p);

                    }

                });

    }

    // 下拉刷新加载数据

    private class GetDataTask extends AsyncTask<String, Integer, String> {

        private String s;

        @Override

        protected String doInBackground(String... params) {

            String url = params[0];

            // 请求数据

            s = NetWorkUtil.loginCheck_Get_HttpClient(url);

            return s;

        }

        @Override

        protected void onPostExecute(String result) {

            // 解析

            Gson gson = new Gson();

            Good good = gson.fromJson(result, Good.class);

            List<MyData> data = good.getData();

            list = data;

            // 适配

            adapter = new Adper(MainActivity.this, list);

            mPullRefreshListView.setAdapter(adapter);

            // 刷新适配器

            adapter.notifyDataSetChanged();

            // 关闭刷新下拉

            mPullRefreshListView.onRefreshComplete();

        }

    }

    // 上拉加载更多

    private class GetDataTask2 extends AsyncTask<String, Integer, String> {

        private String s;

        @Override

        protected String doInBackground(String... params) {

            String url = params[0];

            // 请求数据

            s = NetWorkUtil.loginCheck_Get_HttpClient(url);

            return s;

        }

        @Override

        protected void onPostExecute(String result) {

            // 解析

            Gson gson = new Gson();

            Good good = gson.fromJson(result, Good.class);

            List<MyData> data = good.getData();

            list.addAll(data);

            // 刷新适配器

            adapter.notifyDataSetChanged();

            // Call onRefreshComplete when the list has been refreshed.

            // 关闭上拉加载

            mPullRefreshListView.onRefreshComplete();

        }

    }

}

请求数据NetWorkUtil.java

package com.bawei.myxgridview;

import java.io.IOException;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.params.BasicHttpParams;

import org.apache.http.params.HttpConnectionParams;

import org.apache.http.params.HttpParams;

import org.apache.http.util.EntityUtils;

public class NetWorkUtil {

    public static String loginCheck_Get_HttpClient(String url) {

        // TODO Auto-generated method stub

String result = "";

        HttpGet get = new HttpGet(url);//创建httpClient的get请求对象

        //设置请求参数

        HttpParams params = new BasicHttpParams();

        HttpConnectionParams.setConnectionTimeout(params, 5*1000);

        HttpConnectionParams.setSoTimeout(params, 5*1000);

        HttpClient client = new DefaultHttpClient(params);//创建HttpClient对象

        try {

            HttpResponse res = client.execute(get);//执行请求，获得结果

            if(res.getStatusLine().getStatusCode() == 200){

                HttpEntity entity = res.getEntity();//获得相应结果，是一个HttpEntity对象

                result = EntityUtils.toString(entity, "utf-8");//转换为字符串

            }

        } catch (ClientProtocolException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return result;

    }

}

VO类两个

Good.java

package com.bawei.vo;

import java.util.List;

public class Good {

    private List<MyData> data;

    public Good(List<MyData> data) {

        super();

        this.data = data;

    }

    @Override

    public String toString() {

        return "Good [data=" + data + "]";

    }

    public List<MyData> getData() {

        return data;

    }

    public void setData(List<MyData> data) {

        this.data = data;

    }

    public Good() {

        super();

    }

}

MyData.java

package com.bawei.vo;

public class MyData {

private String news;

private String news_summary;

private String news_title;

private String pic_url;

public String getNews() {

    return news;

}

public void setNews(String news) {

    this.news = news;

}

public String getNews_summary() {

    return news_summary;

}

public void setNews_summary(String news_summary) {

    this.news_summary = news_summary;

}

public String getNews_title() {

    return news_title;

}

public void setNews_title(String news_title) {

    this.news_title = news_title;

}

public String getPic_url() {

    return pic_url;

}

public void setPic_url(String pic_url) {

    this.pic_url = pic_url;

}

@Override

public String toString() {

    return "MyData [news=" + news + ", news_summary=" + news_summary

            + ", news_title=" + news_title + ", pic_url=" + pic_url + "]";

}

public MyData(String news, String news_summary, String news_title,

        String pic_url) {

    super();

    this.news = news;

    this.news_summary = news_summary;

    this.news_title = news_title;

    this.pic_url = pic_url;

}

public MyData() {

    super();

}

}

适配器 Adper.java

package com.bawei.myxgridview;

import java.util.List;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

import com.bawei.vo.MyData;

import com.lidroid.xutils.BitmapUtils;

public class Adper extends BaseAdapter {

    Context context;

    List<MyData> list;

    public Adper(Context context, List<MyData> list) {

        // TODO Auto-generated constructor stub

    this.context=context;

    this.list=list;

    }

    @Override

    public int getCount() {

        // TODO Auto-generated method stub

        return list.size();

    }

    @Override

    public Object getItem(int position) {

        // TODO Auto-generated method stub

        return null;

    }

    @Override

    public long getItemId(int position) {

        // TODO Auto-generated method stub

        return 0;

    }

    @Override

    public View getView(int arg0, View convertView, ViewGroup arg2) {

        // TODO Auto-generated method stub

        viewholder vh;

        if(convertView==null){

            convertView=LayoutInflater.from(context).inflate(R.layout.gridview, null);

            vh=new viewholder();

            vh.image=(ImageView) convertView.findViewById(R.id.image_src);

            vh.title=(TextView) convertView.findViewById(R.id.text_title);

            convertView.setTag(vh);

        }else{

            vh=(viewholder) convertView.getTag();

        }

        BitmapUtils bitmapUtils=new BitmapUtils(context);

        bitmapUtils.display(vh.image,list.get(arg0).getPic_url());

        vh.title.setText(list.get(arg0).getNews_title());

        return convertView;

    }

    class viewholder{

        ImageView image;

        TextView title;

    }

}

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