Java 滑动不';在我滚动之前,请不要将图像加载到ImageView

Java 滑动不';在我滚动之前,请不要将图像加载到ImageView,java,android,listview,android-glide,Java,Android,Listview,Android Glide,我有一个列表视图,并使用Glide从URL加载图像。我只看到我的占位符图像,直到我滚动过那些行。一旦我滚动过这些行,使它们脱离屏幕并滚动回它们,图像就会加载到图像视图中 适配器: package kyfb.android.kyfb.com.kyfb; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graph

我有一个列表视图,并使用Glide从URL加载图像。我只看到我的占位符图像,直到我滚动过那些行。一旦我滚动过这些行,使它们脱离屏幕并滚动回它们,图像就会加载到图像视图中

适配器:

package kyfb.android.kyfb.com.kyfb;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Path;
import android.graphics.Rect;
import android.media.Image;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.squareup.picasso.Picasso;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by KFB on 8/12/14.
 */
class MarketUpdatesAdapter extends BaseAdapter {
    private LayoutInflater inflater;

    public MarketUpdatesAdapter(Context context) {

        inflater = LayoutInflater.from(context);
    }

    public int getCount() {
        // TODO Auto-generated method stub

        return MarketUpdatesFragment.title.length;
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder holder;

        if(convertView == null){
            convertView = inflater.inflate(R.layout.item_feed, null);
            holder = new ViewHolder();
            holder.lytItemFeed = (RelativeLayout) convertView.findViewById(R.id.lytItemFeed);
            holder.txtTitle= (TextView) convertView.findViewById(R.id.txtTitle);
            holder.txtPubDate = (TextView) convertView.findViewById(R.id.txtPubDate);
            holder.thumbnail = (ImageView) convertView.findViewById(R.id.thumbnail);

            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }

        holder.lytItemFeed.setBackgroundColor(Color.TRANSPARENT);

        holder.txtTitle.setText(MarketUpdatesFragment.title[position]);
        holder.txtPubDate.setText(MarketUpdatesFragment.pubDate[position]);

        Context context = parent.getContext();
        if (!"null".equals(MarketUpdatesFragment.thumb[position])) {

            Glide.with(context)
                    .load(MarketUpdatesFragment.thumb[position])
                    .placeholder(R.drawable.placeholder)
                    .error(R.drawable.placeholder)
                    .into(holder.thumbnail);

        } else {
            holder.thumbnail.setImageResource(R.drawable.placeholder);
        }

        holder.txtTitle.setTextColor(Color.WHITE);
        holder.txtPubDate.setTextColor(Color.WHITE);

        return convertView;
    }

    static class ViewHolder {
        TextView txtTitle, txtPubDate;
        ImageView thumbnail;
        RelativeLayout lytItemFeed;
    }


}
片段:

package kyfb.android.kyfb.com.kyfb;

import android.app.Fragment;
import android.app.ListFragment;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.media.Image;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import java.io.IOException;
import java.lang.reflect.Array;
import java.net.MalformedURLException;
import java.net.URL;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import com.squareup.picasso.Picasso;

/**
 * Created by KFB on 8/12/14.
 */
public class MarketUpdatesFragment extends Fragment {

    ListView listFeed;
    ProgressBar prgLoading;
    TextView txtAlert;

    MarketUpdatesAdapter la;

    static String[] title;
    static String[] pubDate;
    static String[] link;
    static String[] thumb;

    String URLFeed;

    URL Feed;
    DocumentBuilder db;
    Document doc;
    NodeList nodeList;
    Bundle rssBundle = new Bundle();

    public MarketUpdatesFragment(){}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        super.onCreateView(inflater, container, savedInstanceState);
        View rootView = inflater.inflate(R.layout.fragment_marketupdates, null);

        URLFeed = "https://www.kyfb.com/index.cfm/_api/feed/v1/KYFB/?feedID=62BDAE63-9862-79EC-82AA7CE0C82E8B26";
        // URLFeed = "http://kyfbnewsroom.com/category/market-updates/feed/";

        Context ctx = rootView.getContext();

        la = new MarketUpdatesAdapter(ctx);

        listFeed = (ListView) rootView.findViewById(R.id.listFeed);
        prgLoading = (ProgressBar) rootView.findViewById(R.id.prgLoading);
        txtAlert = (TextView) rootView.findViewById(R.id.txtAlert);

        ColorDrawable whiteColor = new ColorDrawable(Color.WHITE);
        ColorDrawable blackColor = new ColorDrawable(Color.BLACK);
        listFeed.setDivider(whiteColor);
        listFeed.setDividerHeight(3);

        new getDataTask().execute();

        listFeed.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                                    long arg3) {
                // TODO Auto-generated method stub

                Intent web = new Intent(getActivity(), WebBrowser.class);
                rssBundle.putString("myURL", link[position]);
                web.putExtras(rssBundle);
                startActivity(web);
            }
        });



        return rootView;
    }

    /** this class is used to handle thread */
    public class getDataTask extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            // TODO Auto-generated method stub
            getDataFromFeed();

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // TODO Auto-generated method stub
            //dialog.dismiss();
            prgLoading.setVisibility(8);
            if(title != null){
                listFeed.setVisibility(0);
                listFeed.setAdapter(la);
            }else{
                txtAlert.setVisibility(0);
            }
        }
    }

    /*
     * This code is used to get data from feed and store them
     * to array attributes
     */
    public void getDataFromFeed(){

        try {
            Feed = new URL(URLFeed);
            DocumentBuilderFactory dbf= DocumentBuilderFactory.newInstance();
            db = dbf.newDocumentBuilder();
            doc = db.parse(new InputSource(Feed.openStream()));
            doc.getDocumentElement().normalize();
            nodeList = doc.getElementsByTagName("item");

            title = new String[nodeList.getLength()];
            pubDate = new String[nodeList.getLength()];
            link = new String[nodeList.getLength()];
            thumb = new String[nodeList.getLength()];

            for(int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);

                Element fstElmnt = (Element) node;

                NodeList titleList = fstElmnt.getElementsByTagName("title");
                Element titleElement = (Element) titleList.item(0);
                titleList = titleElement.getChildNodes();
                title[i] = ((Node) titleList.item(0)).getNodeValue();

                NodeList pubDateList = fstElmnt.getElementsByTagName("pubDate");
                Element pubDateElement = (Element) pubDateList.item(0);
                pubDateList = pubDateElement.getChildNodes();
                pubDate[i] = ((Node) pubDateList.item(0)).getNodeValue();
                // chops off the " +0000" on date
                pubDate[i] = pubDate[i].substring(0, pubDate[i].length()-14);

                NodeList linkList = fstElmnt.getElementsByTagName("link");
                Element linkElement = (Element) linkList.item(0);
                linkList = linkElement.getChildNodes();
                link[i] = ((Node) linkList.item(0)).getNodeValue();
            }

            NodeList nodes = doc.getElementsByTagName("enclosure");
            for (int i = 0; i < nodes.getLength(); i++) {
                Element thumbElement = (Element)nodes.item(i);
                String thumbURL = thumbElement.getAttribute("url");
                if (thumbURL.equals("")) {
                    thumb[i] = "null";
                } else {
                    String httpURL = thumbURL;
                    String httpsURL = httpURL.toString().replace("http", "https");
                    thumb[i] = httpsURL;
                }

                // System.out.println(thumb[i]);
            }

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void onConfigurationChanged(final Configuration newConfig)
    {
        // Ignore orientation change to keep activity from restarting
        super.onConfigurationChanged(newConfig);
    }
}
包kyfb.android.kyfb.com.kyfb;
导入android.app.Fragment;
导入android.app.ListFragment;
导入android.content.Context;
导入android.content.Intent;
导入android.content.res.Configuration;
导入android.graphics.Color;
导入android.graphics.drawable.ColorDrawable;
导入android.media.Image;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.support.v4.app.FragmentActivity;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemClickListener;
导入android.widget.ListView;
导入android.widget.ProgressBar;
导入android.widget.TextView;
导入org.w3c.dom.Document;
导入org.w3c.dom.Element;
导入org.w3c.dom.Node;
导入org.w3c.dom.NodeList;
导入org.xml.sax.InputSource;
导入org.xml.sax.SAXException;
导入java.io.IOException;
导入java.lang.reflect.Array;
导入java.net.MalformedURLException;
导入java.net.URL;
导入javax.xml.parsers.DocumentBuilder;
导入javax.xml.parsers.DocumentBuilderFactory;
导入javax.xml.parsers.parserConfiguration异常;
导入com.squareup.picasso.picasso;
/**
*由KFB于2014年8月12日创建。
*/
公共类MarketUpdatesFragment扩展了片段{
ListView listFeed;
进行性阅读;
TextView txtAlert;
市场更新适应洛杉矶;
静态字符串[]标题;
静态字符串[]pubDate;
静态字符串[]链接;
静态字符串[]拇指;
字符串URLFeed;
URL提要;
文档生成器数据库;
文件文件;
NodeList NodeList;
Bundle rssBundle=新Bundle();
public MarketUpdatesFragment(){}
@凌驾
CreateView上的公共视图(布局、充气机、视图组容器、捆绑包保存状态){
super.onCreateView(充气机、容器、保存状态);
视图根视图=充气器。充气(R.layout.fragment\u,null);
URLFeed=”https://www.kyfb.com/index.cfm/_api/feed/v1/KYFB/?feedID=62BDAE63-9862-79EC-82AA7CE0C82E8B26”;
//URLFeed=”http://kyfbnewsroom.com/category/market-updates/feed/";
Context ctx=rootView.getContext();
la=新市场更新适配器(ctx);
listFeed=(ListView)rootView.findviewbyd(R.id.listFeed);
prgLoading=(ProgressBar)rootView.findviewbyd(R.id.prgLoading);
txtAlert=(TextView)rootView.findViewById(R.id.txtAlert);
可着色白色=新的可着色(Color.WHITE);
ColorDrawable blackColor=新的ColorDrawable(Color.BLACK);
setDivider(白色);
listFeed.setDividerHeight(3);
新建getDataTask().execute();
setOnItemClickListener(新的OnItemClickListener(){
公共单击(适配器视图arg0,视图arg1,内部位置,
长arg3){
//TODO自动生成的方法存根
Intent web=新的Intent(getActivity(),WebBrowser.class);
putsString(“myURL”,link[position]);
web.putExtras(rssBundle);
星触觉(网络);
}
});
返回rootView;
}
/**此类用于处理线程*/
公共类getDataTask扩展了AsyncTask{
@凌驾
受保护的void onPreExecute(){
//TODO自动生成的方法存根
}
@凌驾
受保护的Void doInBackground(Void…arg0){
//TODO自动生成的方法存根
getDataFromFeed();
返回null;
}
@凌驾
受保护的void onPostExecute(void结果){
//TODO自动生成的方法存根
//dialog.dismise();
设置可见性(8);
如果(标题!=null){
listFeed.setVisibility(0);
setAdapter(la);
}否则{
txtAlert.setVisibility(0);
}
}
}
/*
*此代码用于从提要获取数据并存储它们
*数组属性
*/
public void getDataFromFeed(){
试一试{
Feed=新URL(URLFeed);
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
db=dbf.newDocumentBuilder();
doc=db.parse(新的InputSource(Feed.openStream());
doc.getDocumentElement().normalize();
nodeList=doc.getElementsByTagName(“项目”);
title=新字符串[nodeList.getLength()];
pubDate=新字符串[nodeList.getLength()];
link=新字符串[nodeList.getLength()];
thumb=新字符串[nodeList.getLength()];
for(int i=0;i