版权声明:李帅哲专属 https://blog.csdn.net/weixin_43584282/article/details/84198254
第一步
导入Android-PullToRefresh中的library包中的数据
//mainactivity函数
package com.example.pullshuaixn;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
public class MainActivity extends AppCompatActivity {
private PullToRefreshListView ptrListView;
private int mPage=1;
private ContentAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_main );
ptrListView = findViewById( R.id.content);
mAdapter = new ContentAdapter( this );
ptrListView.setAdapter( mAdapter );
//同时支持刷新 加载
ptrListView.setMode( PullToRefreshBase.Mode.BOTH );
ptrListView.setOnRefreshListener( new PullToRefreshBase.OnRefreshListener2<ListView>() {
@Override
public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
mPage = 1;
initData();
}
@Override
public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
initData();
}
} );
initData();
}
public String url= "http://api.expoon.com/AppNews/getNewsList/type/1/p/";
private void initData(){
NetUtil.getNetUtil().requsetData( url + mPage, Bean.class, new NetUtil.CallBak<Bean>() {
@Override
public void onsuccess(Bean bean) {
if (mPage == 1){
mAdapter.setDataBeans( bean.getData() );
}else {
mAdapter.addString( bean.getData() );
}
mPage++;
ptrListView.onRefreshComplete();
}
} );
}
}
//Bean类
ALT + S 解析数据
//adapter数据
package com.example.pullshuaixn;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class ContentAdapter extends BaseAdapter {
private Context context;
private List<Bean.DataBean> dataBeans;
public ContentAdapter(Context context) {
this.context = context;
dataBeans = new ArrayList<>( );
}
public void setDataBeans(List<Bean.DataBean> mBeans) {
//this.dataBeans = dataBeans;
dataBeans.clear();
if (dataBeans != null){
dataBeans.addAll( mBeans );
}
notifyDataSetChanged();
}
public void addString(List<Bean.DataBean> mBeans){
if (dataBeans != null){
dataBeans.addAll( mBeans );
}
notifyDataSetChanged();
}
@Override
public int getCount() {
return dataBeans.size();
}
@Override
public Object getItem(int position) {
return dataBeans.get( position );
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null){
convertView = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
holder = new ViewHolder(convertView);
}else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView.setText(dataBeans.get( position ).getNews_title());
return convertView;
}
class ViewHolder{
TextView textView;
protected View convertView;
public ViewHolder(View convertView) {
textView = convertView.findViewById( R.id.text_ID );
convertView.setTag( this );
}
}
}
//子布局
根据需求自定义子布局
//main 主要布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
tools:context=".MainActivity">
<com.handmark.pulltorefresh.library.PullToRefreshListView
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"></com.handmark.pulltorefresh.library.PullToRefreshListView>
</LinearLayout>
//工具类
package com.example.pullshuaixn;
import android.annotation.SuppressLint;
import android.os.AsyncTask;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import javax.security.auth.callback.Callback;
public class NetUtil {
private static NetUtil netUtil;
public NetUtil(){
}
public static NetUtil getNetUtil(){
if (netUtil == null){
netUtil = new NetUtil();
}
return netUtil;
}
public interface CallBak<T>{
void onsuccess(T t);
}
@SuppressLint("StaticFieldLeak")
public void requsetData(String strurl, final Class clazz, final CallBak callback){
new AsyncTask<String, Void, Object>() {
@Override
protected Object doInBackground(String... strings) {
return requsetData( strings[0],clazz );
}
@Override
protected void onPostExecute(Object o) {
callback.onsuccess( o );
}
}.execute( strurl );
}
private <T>T requsetData(String string, Class clazz) {
return (T) new Gson().fromJson( requsetData(string),clazz );
}
private String requsetData(String str){
try {
URL url = new URL(str);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
int responseCode = urlConnection.getResponseCode();
if(responseCode==200){
String s = streamTostring(urlConnection.getInputStream());
return s;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public String streamTostring(InputStream inputStream) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder builder=new StringBuilder();
for (String tmp=bufferedReader.readLine();tmp!=null;tmp=bufferedReader.readLine()){
builder.append(tmp);
}
return builder.toString();
}
}