XListView上拉載入下拉重新整理，第一個條目展示Banner輪播圖
阿新 • • 發佈：2018-11-12
佈局開始
此處只有xlistview的佈局
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" > <ImageView android:id="@+id/icon" android:layout_width="140dp" android:layout_height="100dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> <TextView android:id="@+id/title" android:layout_width="0dp" android:layout_height="wrap_content" android:maxLines="1" android:text="title" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toLeftOf="@id/icon" app:layout_constraintTop_toTopOf="@id/icon" /> <TextView android:id="@+id/summary" android:layout_width="0dp" android:layout_height="wrap_content" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toLeftOf="@id/icon" app:layout_constraintBottom_toBottomOf="@id/icon" android:maxLines="2" android:text="摘要" /> </android.support.constraint.ConstraintLayout>
MainActivity
package com.xxx.zkb2.activity; import android.annotation.SuppressLint; import android.os.AsyncTask; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.Toast; import com.example.mylibrary.me.maxwin.view.XListView; import com.example.xxx.zkb2.R; import com.google.gson.Gson; import com.xxx.zkb2.adapter.NewsAdapter; import com.xxx.zkb2.model.Banner; import com.xxx.zkb2.model.News; import com.xxx.zkb2.utils.HttpUtil; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { /*private ArrayList<News.ResultBean> newslist; private ArrayList<Banner.DataBean> bannerlist;*/ private XListView xlv; private NewsAdapter newsAdapter; //每次載入10條 private int loadItemCount = 2; //初始頁面 private int page=1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //查詢資源id xlv=findViewById(R.id.xlv); //初始化集合 /* newslist=new ArrayList<News.ResultBean>(); bannerlist=new ArrayList<Banner.DataBean>();*/ //新增介面卡（bannerlist是新增在adapter第一條資料中） newsAdapter=new NewsAdapter(MainActivity.this); xlv.setAdapter(newsAdapter); //設定xlistview事件 xlv.setXListViewListener(new XListView.IXListViewListener() { @Override public void onRefresh() { page=1; //載入輪播圖片 loadBannerData(); //載入新聞 loadNewsData(page); } @Override public void onLoadMore() { loadNewsData(page); } }); //一進來預設可以載入更多 setCanLoadMore(true); //一進來就載入：Banner資料和列表資料 loadBannerData(); loadNewsData(page); } //獲得輪播圖片資料 private void loadBannerData() { String path="http://www.zhaoapi.cn/quarter/getAd"; new AsyncTask<String,Void,List<Banner.DataBean>>(){ @Override protected List<Banner.DataBean> doInBackground(String... strings) { String textString=HttpUtil.HttpUrlConnection(strings[0]); Banner banner=new Gson().fromJson(textString,Banner.class); return banner==null?null:banner.getData(); } @Override protected void onPostExecute(List<Banner.DataBean> dataBeans) { super.onPostExecute(dataBeans); //更新banner資料 newsAdapter.setbannerData(dataBeans); } }.execute(path); } //每次更新追加完資料停止重新整理，停止載入 private void loadDataCompleted() { page++; xlv.stopLoadMore(); xlv.stopRefresh(); } //獲得新聞資料 @SuppressLint("StaticFieldLeak") private void loadNewsData(final int page) { Log.e("page", page+"" ); final String path="http://172.17.8.100/movieApi/movie/v1/findHotMovieList?page="+page+"&count="+loadItemCount; new AsyncTask<String,Void,ArrayList<News.ResultBean>>(){ @Override protected ArrayList<News.ResultBean> doInBackground(String... strings) { String textString= HttpUtil.HttpUrlConnection(strings[0]); Gson gson=new Gson(); News news=gson.fromJson(textString,News.class); return news==null?null: (ArrayList<News.ResultBean>) news.getResult(); } @Override protected void onPostExecute(ArrayList<News.ResultBean> resultBeans) { super.onPostExecute(resultBeans); if(resultBeans==null){ Toast.makeText(MainActivity.this,"請求新聞資料失敗",Toast.LENGTH_SHORT).show(); return; } updateData(resultBeans); //通知載入資料完成 loadDataCompleted(); //是否可以載入更多：載入列表資料不夠loadItemCount則認為沒有下一頁資料 setCanLoadMore(resultBeans.size()>=loadItemCount); //newslist.clear(); } }.execute(path); } //是否可以載入更多 private void setCanLoadMore(boolean b) { xlv.setPullLoadEnable(b); } private void updateData(ArrayList<News.ResultBean> resultBeans) { if(page==1){ //更新新聞資料 newsAdapter.setNewsData(resultBeans); } else { //追加新聞資料 newsAdapter.addNewsData(resultBeans); } } }
接下來是Adapter類
其中輪播圖介面卡BannerAdapter省略
NewsAdapter，多列表，判斷是否有Banner資料，有的話，集合數量+1。
package com.xxx.zkb2.adapter; import android.os.Handler; import android.os.Message; import android.support.v4.view.ViewPager; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.xxx.zkb2.R; import com.nostra13.universalimageloader.core.ImageLoader; import com.xxx.zkb2.activity.MainActivity; import com.xxx.zkb2.model.Banner; import com.xxx.zkb2.model.News; import java.util.ArrayList; import java.util.List; public class NewsAdapter extends BaseAdapter{ private MainActivity mainActivity; private ArrayList<News.ResultBean> newslist; private ArrayList<Banner.DataBean> bannerlist; BannerViewHolder bh; public NewsAdapter(MainActivity mainActivity) { this.mainActivity = mainActivity; newslist=new ArrayList<>(); bannerlist=new ArrayList<>(); } /** * 更新 列表 資料 * @param */ public void setNewsData(ArrayList<News.ResultBean> resultBeans) { newslist.clear(); newslist.addAll(resultBeans); notifyDataSetChanged(); } /** * 新增 列表 資料 * @param */ public void addNewsData(ArrayList<News.ResultBean> resultBeans) { newslist.addAll(resultBeans); notifyDataSetChanged(); } /** * 更新 Banner 資料 * @param */ public void setbannerData(List<Banner.DataBean> dataBeans) { newslist.clear(); bannerlist.addAll(dataBeans); notifyDataSetChanged(); } private boolean hasBanner() { return bannerlist.size() > 0; } @Override public int getItemViewType(int position) { //有banner 且 position == 0 則是Banner資料 //0代表banner,1代表新聞列表 return hasBanner()&&position==0?0:1; } @Override public int getViewTypeCount() { return super.getViewTypeCount()+1; } @Override public int getCount() { //如果有Banner，則需要展示Banner資料，因此+1 return newslist.size()+(hasBanner()?1:0); } @Override public Object getItem(int position) { if(hasBanner() && position == 0) { return null; } //如果有banner，第一條是Banner資料。因此真正的資料從position -1開始 return newslist.get(hasBanner()?position-1:position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if(getItemViewType(position)==0){//banner if(convertView==null){ bh = new BannerViewHolder(); convertView=View.inflate(mainActivity, R.layout.banner,null); bh.viewPager=convertView.findViewById(R.id.viewpager); convertView.setTag(bh); } else { bh= (BannerViewHolder) convertView.getTag(); } bh.viewPager.setAdapter(new BannerAdapter(mainActivity,bannerlist)); //清除之前handler傳送的訊息 handler.removeCallbacksAndMessages(null); //傳送請求 handler.sendEmptyMessageDelayed(0,2000); } else {//news ListViewHolder lh = new ListViewHolder(); if (convertView == null) { convertView=View.inflate(mainActivity,R.layout.lv_item,null); lh.title = convertView.findViewById(R.id.title); lh.summary = convertView.findViewById(R.id.summary); lh.icon = convertView.findViewById(R.id.icon); convertView.setTag(lh); } else { lh = (ListViewHolder) convertView.getTag(); } News.ResultBean data= (News.ResultBean) getItem(position); lh.title.setText(data.getName()); lh.summary.setText(data.getSummary()); ImageLoader.getInstance().displayImage(data.getImageUrl(),lh.icon); } return convertView; } Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what){ case 0: int positon=bh.viewPager.getCurrentItem(); positon++; bh.viewPager.setCurrentItem(positon); handler.sendEmptyMessageDelayed(0,2000); break; } } }; class BannerViewHolder { private ViewPager viewPager; } class ListViewHolder { private ImageView icon; private TextView title; private TextView summary; } }
輪播圖和新聞的Bean類省略
ImageLoader，載入圖片
package com.xxx.zkb2;
import android.app.Application;
import android.graphics.Bitmap;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoader.getInstance().init(
new ImageLoaderConfiguration.Builder(this)
.memoryCacheSizePercentage(10)
.diskCacheSize(50*1024*1024)
.defaultDisplayImageOptions(new DisplayImageOptions.Builder()
.cacheOnDisk(true)
.cacheInMemory(true)
.bitmapConfig(Bitmap.Config.ARGB_4444)
.build()
)
.build()
);
}
}
效果圖如下
