AsyncTask+PullToRefreshListView+ImageLoder+上拉加载，下拉刷新
来源：互联网 发布：埃德和沃伦夫妇知乎 编辑：程序博客网 时间：2024/06/07 19:16
准备工作：
1.引入gson-2.2.4.jar
2.引入universal-image-loader-1.9.3-with-sources.jar
3.倒进Android-PullToRefresh-master里的library在Module dependency里添加
4.加权限com.android.support:design (com.android.support:design:26.0.0-alpha1)
activity_main.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:ptr="http://schemas.android.com/apk/res-auto" tools:context="com.example.administrator.fuxi_05.MainActivity"> <com.handmark.pulltorefresh.library.PullToRefreshListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/pull_lv" ptr:ptrDrawable="@drawable/default_ptr_flip" ptr:ptrAnimationStyle="flip" ptr:ptrHeaderBackground="#383838" ptr:ptrHeaderTextColor="#FFFFFF" > </com.handmark.pulltorefresh.library.PullToRefreshListView></RelativeLayout>item.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/imageView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher"/> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/imageView" android:layout_toRightOf="@+id/imageView" android:layout_toEndOf="@+id/imageView" android:layout_marginLeft="47dp" android:layout_marginStart="47dp" android:layout_marginBottom="10dp" /></RelativeLayout>Bean（这只是一个bean演示具体请参考自己的接口）
package com.example.administrator.fuxi_05;import java.util.List;/** * Created by lenovo on 2017/10/25. */public class Bean { /** * code : 200 * msg : success * newslist : [{"ctime":"2017-10-25","title":"西方或仍在迷茫，中国已八个\u201c明确\u201d","description":"海外网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990598.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889630&signature=83-E1YbfzVxRLIRiWKtnbvDphVmVfw*QU5m0*DKPkyjdSgCvpHCS7Pti6ncE5MzSL1rDdh*5JgaDqmh2dMQ*GDKsgCYLx-tJY0*vWcHt70Y="},{"ctime":"2017-10-25","title":"房地产新时代：房屋租赁开启蓝海","description":"第一财经网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990601.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889630&signature=FjP*h0If2SxbRoT-atlihCyDWY6-UpQ-eDjlw22rspRvyBvrHItLof6SvRBpla50jr4t8Hw7C8SddMhEdJyazQchkh-qi6ivzyYTL2-gzd0="},{"ctime":"2017-10-25","title":"历史的选择 人民的选择 全党的选择","description":"海外网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-37632835.static/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889629&signature=uHTwsd4NnOGMd4RaGkgL0*S7DgFBhepEY9Ljrw1*dLMt1G-BVqmL4y3vZVJiEjA6XXjZy4Sie*p1wARsngAf6OOs9y1o46G*bbpLiWMgU5s="},{"ctime":"2017-10-25","title":"CBA\u201c姚\u201d赛季开场，职业化走出飞升曲线","description":"第一财经网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990724.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889629&signature=wNkKRyMyIRiRXEECfCMVa3l0ZBl4OeYZ172StUtlM*WdJ5fPaH*bT5B0wQWQd6HGeMKMhUF0lNFWpQjk85Aya5050Pzp5JEfpAtTRoS7ZPU="},{"ctime":"2017-10-25","title":"管你速度再快，没刹车只能抓瞎","description":"大家车言论","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990563.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889629&signature=alOTmOeX54JAFXi7VWMZl*No-qcdIfJJE4-LJsw5wb5vQx6FPEv5VYQpokXn50Lj0wpve8xfyqd-vlBaEr5B*y3a1Rk1d*2xiczaJWK00kE="},{"ctime":"2017-10-25","title":"羊身上一物治耳鸣耳聋，一千四百年前被名医相中，终于流传开","description":"微门诊","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990453.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889629&signature=u-GpZMcMn1hwQondm7WXD2QrecDezYHHtz-wHaGuLGHNyk49PCxky5r2Cj*fxgRt30FQca6cnXXynCt78g49qIA24DTmW-92XgKVdipyg6g="},{"ctime":"2017-10-25","title":"治鼻炎，此方是\u201c鼻祖\u201d，冬天最常用，流行七百多年","description":"微门诊","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990454.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889628&signature=nIjbIU865ZL*0xxHgNHIzClHhREY3AKtiSkcAv*4cT2zOFdxJsBlkbUKl4pRLfPkJ8xb8475IqyMZjYHevYFB6t7LyafeoEZTrbu6lfxsw0="},{"ctime":"2017-10-25","title":"买房容易验房难！这些陷阱你要注意","description":"腾讯财经","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990475.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889628&signature=vKw9FtCbTJg-QL0uTRmzzh079IX2gdSzxlqarrAhQhUjaNL-mGx4iO9G-Ry0EouzNWcP6reDmOcL7tqufr8W730XSMKRZqJ*zNoQHgrF3g8="},{"ctime":"2017-10-25","title":"日本又双叒出造假丑闻！这次连\u201c神户牛肉\u201d也沦陷了？","description":"腾讯财经","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990473.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889628&signature=vttOVoCgI0W0nuvt1YVrou0N0ZJ0176G3yPZXpPB32bjQvmLrGVEsCcL4yZlpr*N-guO-kFDJUkqqHZo-*VUVMmSTcYWvK5cS5j*YxvANNk="},{"ctime":"2017-10-25","title":"这种理财产品在中国终于出现了！ 1块钱也可投资房产？","description":"腾讯财经","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990496.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889627&signature=BcFgnd0Nk9Y2HSbAS9QTBewByeUDLpx94dxYbH2rTs9I2*T5cGppSO4*c1r1*LYCQbtam*mr9TnGkVE-BBpQgQJtq6eESm2wGqW0Sm4pGZg="}] */ private int code; private String msg; private List<NewslistBean> newslist; public int getCode() { return code; } public void setCode(int code) { this.code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public List<NewslistBean> getNewslist() { return newslist; } public void setNewslist(List<NewslistBean> newslist) { this.newslist = newslist; } public static class NewslistBean { /** * ctime : 2017-10-25 * title : 西方或仍在迷茫，中国已八个“明确” * description : 海外网 * picUrl : https://zxpic.gtimg.com/infonew/0/wechat_pics_-55990598.jpg/640 * url : https://mp.weixin.qq.com/s?src=16&ver=447×tamp=1508889630&signature=83-E1YbfzVxRLIRiWKtnbvDphVmVfw*QU5m0*DKPkyjdSgCvpHCS7Pti6ncE5MzSL1rDdh*5JgaDqmh2dMQ*GDKsgCYLx-tJY0*vWcHt70Y= */ private String ctime; private String title; private String description; private String picUrl; private String url; public String getCtime() { return ctime; } public void setCtime(String ctime) { this.ctime = ctime; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } public String getPicUrl() { return picUrl; } public void setPicUrl(String picUrl) { this.picUrl = picUrl; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } }}Mytask
package com.example.administrator.fuxi_05;import android.os.AsyncTask;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.ProtocolException;import java.net.URL;/** * Created by lenovo on 2017/10/25. */public class Mytask extends AsyncTask<String,Void,String>{ //申请一个接口类对象 private Icallbacks icallbacks; //将无参构造设置成私有的，使之在外部不能够调用 private Mytask(){} //定义有参构造方法 public Mytask(Icallbacks icallbacks) { this.icallbacks = icallbacks; } @Override protected String doInBackground(String... strings) { String str=""; try { //使用HttpUrlConnection URL url=new URL(strings[0]); HttpURLConnection connection=(HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setReadTimeout(5000); connection.setConnectTimeout(5000); if(connection.getResponseCode()==200){ InputStream inputStream=connection.getInputStream(); //调用工具类中的静态方法 str=StreamToString.streamToStr(inputStream,"utf-8"); } } catch (MalformedURLException e) { e.printStackTrace(); }catch (IOException e){ e.printStackTrace(); } return str; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); //解析，封装到bean,更新ui组件 icallbacks.updateUiByjson(s); } //定义一个接口 public interface Icallbacks{ /** * 根据回传的json字符串，解析并更新页面组件 * @param jsonstr */ void updateUiByjson(String jsonstr); }}StreamToString.java
package com.example.administrator.fuxi_05;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;/** * Created by lenovo on 2017/10/25. */public class StreamToString { public static String streamToStr(InputStream inputStream, String chartSet){ StringBuilder builder=new StringBuilder(); try { BufferedReader br=new BufferedReader(new InputStreamReader(inputStream,chartSet)); String con; while ((con=br.readLine())!=null){ builder.append(con); } br.close(); return builder.toString(); } catch (Exception e) { e.printStackTrace(); } return ""; }}ImageLoder.java
package com.example.administrator.fuxi_05;import android.app.Application;import android.graphics.Bitmap;import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import java.io.File;/** * Created by lenovo on 2017/10/25. */public class ImageLoder extends Application { @Override public void onCreate() { super.onCreate();//storage/sdcard/data/<package>/cache //sd/mycache/ File cacheDir=this.getExternalCacheDir();//自定义缓存路径 ImageLoaderConfiguration configuration=new ImageLoaderConfiguration.Builder(this) .memoryCache(new LruMemoryCache(2 * 1024 * 1024))//设置内存缓存区大小 .memoryCacheSize(10 * 1024 * 1024)//设置缓存区大小 .memoryCacheExtraOptions(520,520)//缓存图片最大的宽度与高度 px .diskCacheSize(50*1024*1024)//设置sd卡缓存的空间大小 .diskCacheFileNameGenerator(new Md5FileNameGenerator())//sd卡缓存图片的命名 使用md5加密方式 .diskCache(new UnlimitedDiscCache(cacheDir))//自定义sd卡的缓存路径 .diskCacheFileCount(100)//缓存文件的最大数量 .writeDebugLogs()//写入日志 .threadPoolSize(3)//线程 .build(); //对imageLoader进行初使化 ImageLoader.getInstance().init(configuration); } public final static DisplayImageOptions getDefaultDisplayOption() { DisplayImageOptions options = new DisplayImageOptions.Builder() .cacheInMemory(true)//进行内存缓存 .cacheOnDisk(true)//进行sd卡缓存 .showImageOnLoading(R.drawable.ic_stub) // 设置正在下载中的图片 .showImageForEmptyUri(R.drawable.ic_empty) //没有请求地址时 .showImageOnFail(R.drawable.ic_error)//下载错误时 .bitmapConfig(Bitmap.Config.RGB_565).build(); //设置图片质量build(); // 创建配置过得DisplayImageOption对象 return options; }}MainActivity.java
package com.example.administrator.fuxi_05;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.google.gson.Gson;import com.handmark.pulltorefresh.library.ILoadingLayout;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshListView;import com.nostra13.universalimageloader.core.ImageLoader;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity { private List<Bean.NewslistBean> sjlist = new ArrayList<>(); private PullToRefreshListView pull; int pageIndex =1; private Handler myHandler = new Handler(); private List<Bean.NewslistBean> newslist; private MyAdapter adapter; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pull = (PullToRefreshListView) findViewById(R.id.pull_lv); initLv(); initData(); } private void initData() { Mytask myTask = new Mytask(new Mytask.Icallbacks() { @Override public void updateUiByjson(String jsonstr) { Gson gson = new Gson(); Bean bean = gson.fromJson(jsonstr, Bean.class); List<Bean.NewslistBean> newslist = bean.getNewslist(); sjlist.addAll(newslist); Log.d("zzz",newslist+"newlist"); setAdapter(); } }); myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+pageIndex); } private void initLv() { //设置刷新模式 ，both代表支持上拉和下拉，pull_from_end代表上拉，pull_from_start代表下拉 pull.setMode(PullToRefreshBase.Mode.BOTH);/*getLoadingLayoutProxy 方法指定上拉和下拉时显示的状态的区别，第一个true 代表下拉状态 ，第二个true 代表上拉的状态如果想区分上拉和下拉状态的不同，可以分别设置*/ ILoadingLayout startLabels = pull.getLoadingLayoutProxy(true, false); startLabels.setPullLabel("下拉刷新"); startLabels.setRefreshingLabel("正在拉"); startLabels.setReleaseLabel("放开刷新"); ILoadingLayout endLabels = pull.getLoadingLayoutProxy(false, true); endLabels.setPullLabel("上拉刷新"); endLabels.setRefreshingLabel("正在载入..."); endLabels.setReleaseLabel("放开刷新...");/*如果Mode设置成Mode.BOTH，需要设置刷新Listener为OnRefreshListener2，并实现onPullDownToRefresh()、onPullUpToRefresh()两个方法。 如果Mode设置成Mode.PULL_FROM_START或Mode.PULL_FROM_END，需要设置刷新Listener为OnRefreshListener，同时实现onRefresh()方法。 当然也可以设置为OnRefreshListener2，但是Mode.PULL_FROM_START的时候只调用onPullDownToRefresh()方法，Mode.PULL_FROM_END的时候只调用onPullUpToRefresh()方法. 加载数据完成后 必须 调用下 onRefreshComplete() 完成关闭 header,footer视图*/ pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() { @Override public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {//下拉刷新的回调 //下拉刷新的数据，显示在listview列表的最上面 addtoTop(); myHandler.postDelayed(new Runnable() { @Override public void run() { //刷新完成，必须在异步下完成 pull.onRefreshComplete(); //刷新适配器 setAdapter(); } },1000); } @Override public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {//上拉加载的回调 //加载更多的数据，添加到集合列表的最后面 addtoBottom(); myHandler.postDelayed(new Runnable() { @Override public void run() { //刷新完成，必须在异步下完成 pull.onRefreshComplete(); //刷新适配器 setAdapter(); } },1000); } }); } //下拉加载 public void addtoTop(){ Mytask myTask=new Mytask(new Mytask.Icallbacks() { @Override public void updateUiByjson(String jsonstr) { Gson gson=new Gson(); Bean bean=gson.fromJson(jsonstr, Bean.class); //添加到大集合对象中 List<Bean.NewslistBean> newslist = bean.getNewslist(); sjlist.addAll(0,newslist); //设置适配器 setAdapter(); Log.d("z1",newslist+"newlist"); } }); myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1" ); } //上拉刷新 public void addtoBottom(){ pageIndex++; Mytask myTask=new Mytask(new Mytask.Icallbacks() { @Override public void updateUiByjson(String jsonstr) { Gson gson=new Gson(); Bean bean=gson.fromJson(jsonstr, Bean.class); List<Bean.NewslistBean> newslist = bean.getNewslist(); //添加到大集合对象中 sjlist.addAll(0,newslist); Log.d("zzzz2",newslist+"newlist"); //设置适配器 setAdapter(); } }); myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+pageIndex); } public void setAdapter(){ if(adapter==null){ adapter=new MyAdapter(); pull.setAdapter(adapter); }else{ adapter.notifyDataSetChanged(); } } class MyAdapter extends BaseAdapter { @Override public int getCount() { return sjlist.size(); } @Override public Object getItem(int position) { return sjlist.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHodler holder; if (convertView == null) { holder = new ViewHodler(); convertView = View.inflate(MainActivity.this, R.layout.item, null); holder.imageView = (ImageView) convertView.findViewById(R.id.imageView); holder.tv = (TextView) convertView.findViewById(R.id.tv); convertView.setTag(holder); } else { holder = (ViewHodler) convertView.getTag(); holder.tv.setText(sjlist.get(position).getTitle()); ImageLoader.getInstance().displayImage(sjlist.get(position).getPicUrl(), holder.imageView); } return convertView; } } class ViewHodler{ private ImageView imageView; private TextView tv; } }清单文件需要加权限1.uses-permission2.application里加name
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.administrator.fuxi_05"> <uses-permission android:name="android.permission.INTERNET"></uses-permission> <application android:name=".ImageLoder" android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" 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>阅读全文
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