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PullToRefreshListView实现多条目加载上拉刷新和下拉加载

2020-04-28 12:04 591 查看

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

XML布局

主页面main布局

<com.handmark.pulltorefresh.library.PullToRefreshListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/pull"
>
</com.handmark.pulltorefresh.library.PullToRefreshListView>

pulllist布局

<ImageView
android:layout_width="120dp"
android:layout_height="100dp"
android:id="@+id/iv"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv"
/>

java代码

App页面

package com.example.duanpengpenglx20171108;

import android.app.Application;

import com.nostra13.universalimageloader.cache.memory.impl.UsingFreqLimitedMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.download.BaseImageDownloader;

/**
* Created by 朋 on 2017/11/8.
*/

public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoaderConfiguration config = new ImageLoaderConfiguration
.Builder(this)
.memoryCacheExtraOptions(480,800)
.threadPoolSize(5)
.threadPriority(Thread.NORM_PRIORITY - 2)
.denyCacheImageMultipleSizesInMemory()
.memoryCache(new UsingFreqLimitedMemoryCache(2 * 1024 * 1024)) // You can pass your own memory cache implementation/你可以通过自己的内存缓存实现
.memoryCacheSize(2 * 1024 * 1024)
.tasksProcessingOrder(QueueProcessingType.LIFO)
.defaultDisplayImageOptions(DisplayImageOptions.createSimple())
.imageDownloader(new BaseImageDownloader(this, 5 * 1000, 30 * 1000)) // connectTimeout (5 s), readTimeout (30 s)超时时间
.writeDebugLogs() // Remove for release app
.build();//开始构建
//初始化imageloader;
ImageLoader.getInstance().init(config);
}
}

MainActivity页面

public class MainActivity extends AppCompatActivity {

List<Jbean.DataBean> arr = new ArrayList();
private View view;
private ListView lv;
private Adapter adapter;
int i = 0;
private PullToRefreshListView pull;
private Adapter adapter1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pull = (PullToRefreshListView) findViewById(R.id.pull);
pull.setMode(PullToRefreshBase.Mode.BOTH);
ListView lv = pull.getRefreshableView();
adapter1 = new Adapter();
lv.setAdapter(adapter1);

new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=0");
pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
@Override
//上拉
public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
arr.clear();
i = 0;
new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i);
}
@Override
//下拉加载20条
public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
i = i + 20;new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i);

}
});
}
class MyAsyncTask extends AsyncTask<String, Void, String> {

@Override
protected String doInBackground(String... params) {
String string = "";
StringBuffer stringBuffer = new StringBuffer();
try {
URL url = new URL(params[0]);
URLConnection urlConnection = url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
while ((string = bufferedReader.readLine()) != null) {
stringBuffer.append(string);
}
} catch (Exception e) {
e.printStackTrace();
}
return stringBuffer.toString();
}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Jbean fragone_bean = new Gson().fromJson(s, Jbean.class);
List<Jbean.DataBean> data = fragone_bean.getData();
arr.addAll(data);
adapter1.notifyDataSetChanged();
pull.onRefreshComplete();
}
}

class Adapter extends BaseAdapter {

@Override
public int getCount() {
return arr.size();
}

@Override
public Object getItem(int position) {
return arr.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
Sj sj = new Sj();
Jbean.DataBean dataBean = arr.get(position);
if (convertView==null){
convertView = View.inflate(MainActivity.this,R.layout.pulllist,null);
sj.image=convertView.findViewById(R.id.iv);
sj.tv=convertView.findViewById(R.id.tv);
convertView.setTag(sj);
}else {
sj =(Sj) convertView.getTag();
}
sj.tv.setText(dataBean.getSUBTITLE());
DisplayImageOptions options = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.cacheOnDisk(true)
.showImageOnLoading(R.drawable.zhengzaijiazai)
.showImageForEmptyUri(R.drawable.zhengzaijiazai)
.showImageOnFail(R.drawable.zhengzaijiazai)
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
ImageLoader.getInstance().displayImage((String) dataBean.getIMAGEURL(),sj.image,options);

return convertView;
}
}
class Sj{
ImageView image;
TextView tv;
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助

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标签： PullToRefreshListView 下拉加载上拉刷新

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