我正在尝试使用 ArrayList 用 XML 数据填充 ListView - 到目前为止我已经能够完成 - 问题是 ArrayList 似乎没有用超出第一个项目的数据填充 ListView listView，我不确定为什么。
截图
XML 数据:
此 XML 文件似乎没有任何关联的样式信息。文档树如下所示。
<response>
<cmd>getVideos</cmd>
<success>1</success>
<NumberOfVideos>4</NumberOfVideos>
<Videos>
<Video>
<VideoName>sample_iPod</VideoName>
<VideoDesc/>
<VideoUrl>
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/06087297988b.m4v
</VideoUrl>
<VideoTags/>
</Video>
<Video>
<VideoName>sample_mpeg4</VideoName>
<VideoDesc/>
<VideoUrl>
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/b5ed9e7100e2.mp4
</VideoUrl>
<VideoTags/>
</Video>
<Video>
<VideoName>sample_sorenson</VideoName>
<VideoDesc/>
<VideoUrl>
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/2a8e64b24997.mov
</VideoUrl>
<VideoTags/>
</Video>
<Video>
<VideoName>sample_iTunes</VideoName>
<VideoDesc/>
<VideoUrl>
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/6c7f65254aad.mov
</VideoUrl>
<VideoTags/>
</Video>
</Videos>
</response>
CustomListViewAdapter.java
public class CustomListViewAdapter extends ArrayAdapter<Cmd> {
Activity context;
List<Cmd> videos;
public CustomListViewAdapter(Activity context, List<Cmd> videos) {
super(context, R.layout.list_item2, videos);
this.context = context;
this.videos = videos;
}
/*private view holder class*/
private class ViewHolder {
ImageView imageView;
TextView txtSuccess;
TextView txtCmd;
TextView txtPrice;
}
public Cmd getItem(int position) {
return videos.get(position);
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item2, null);
holder = new ViewHolder();
holder.txtSuccess = (TextView) convertView.findViewById(R.id.success);
holder.txtCmd = (TextView) convertView.findViewById(R.id.cmd);
holder.txtPrice = (TextView) convertView.findViewById(R.id.price);
holder.imageView = (ImageView) convertView.findViewById(R.id.thumbnail);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Cmd cmd = (Cmd) getItem(position);
holder.txtSuccess.setText(cmd.getSuccess());
holder.txtCmd.setText(cmd.getCmd());
// holder.imageView.setImageBitmap(cmd.getImageBitmap());
holder.txtPrice.setText(cmd.getVideoName() + "");
return convertView;
}
}
SAXParserAsyncTaskActivity.java
public class SAXParserAsyncTaskActivity extends Activity implements
OnClickListener, OnItemClickListener {
Button button;
ListView listView;
List<Cmd> videos = new ArrayList<Cmd>();
CustomListViewAdapter listViewAdapter;
static final String URL = "http://mobile.example.com/api/xml.php?cmd=getVideos&username=fake&password=";
public static final String LIBRARY = "Library";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.parser_main);
findViewsById();
button.setOnClickListener(this);
listView.setOnItemClickListener(this);
GetXMLTask task = new GetXMLTask(this);
task.execute(new String[] { URL });
}
private void findViewsById() {
button = (Button) findViewById(R.id.button);
listView = (ListView) findViewById(R.id.cmdList);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
}
@Override
public void onClick(View view) {
// GetXMLTask task = new GetXMLTask(this);
// task.execute(new String[] { URL });
}
// private inner class extending AsyncTask
private class GetXMLTask extends AsyncTask<String, Void, List<Cmd>> {
private Activity context;
public GetXMLTask(Activity context) {
this.context = context;
}
protected void onPostExecute(List<Cmd> videos) {
listViewAdapter = new CustomListViewAdapter(context, videos);
listView.setAdapter(listViewAdapter);
}
/*
* uses HttpURLConnection to make Http request from Android to download
* the XML file
*/
private String getXmlFromUrl(String urlString) {
StringBuffer output = new StringBuffer("");
try {
InputStream stream = null;
URL url = new URL(urlString);
URLConnection connection = url.openConnection();
HttpURLConnection httpConnection = (HttpURLConnection) connection;
httpConnection.setRequestMethod("GET");
httpConnection.connect();
if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
stream = httpConnection.getInputStream();
BufferedReader buffer = new BufferedReader(
new InputStreamReader(stream));
String s = "";
while ((s = buffer.readLine()) != null)
output.append(s);
}
} catch (Exception ex) {
ex.printStackTrace();
}
return output.toString();
}
@Override
protected List<Cmd> doInBackground(String... urls) {
List<Cmd> videos = null;
String xml = null;
for (String url : urls) {
xml = getXmlFromUrl(url);
InputStream stream = new ByteArrayInputStream(xml.getBytes());
videos = SAXXMLParser.parse(stream);
for (Cmd cmd : videos) {
String videoName = cmd.getVideoName();
// String getVideos = cmd.getVideos();
String getVideo = cmd.getVideo();
String getVideoURL = cmd.getVideoURL();
String getNumberOfVideos = cmd.getNumberOfVideos();
Bitmap bitmap = null;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
try {
bitmap = BitmapFactory.decodeStream(
new URL(videoName).openStream(), null,
bmOptions);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// stream.close();
return videos;
}
}
}
命令.java
public class Cmd implements ListAdapter {
private String success;
private String cmd;
List<Cmd> videos;
private String video;
private String numberofvideos;
private String videoname;
private String videourl;
private LayoutInflater mInflater;
Button fav_up_btn1;
Button fav_dwn_btn1;
Context my_context;
// private Bitmap imageBitmap;
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// If convertView wasn't null it means we have already set it to our
// list_item_user_video so no need to do it again
if (convertView == null) {
// This is the layout we are using for each row in our list
// anything you declare in this layout can then be referenced below
convertView = mInflater.inflate(R.layout.list_item_user_video,
parent, false);
}
// We are using a custom imageview so that we can load images using urls
ImageView thumb = (ImageView) convertView
.findViewById(R.id.userVideoThumbImageView);
//thumb.setScaleType(ScaleType.FIT_XY);
TextView title = (TextView) convertView
.findViewById(R.id.userVideoTitleTextView);
TextView uploader = (TextView) convertView
.findViewById(R.id.userVideouploaderTextView);
TextView viewCount = (TextView) convertView
.findViewById(R.id.userVideoviewsTextView);
uploader.setText(videos.get(position).getTitle());
viewCount.setText(videos.get(position).getviewCount() + " views");
fav_up_btn1 = (Button) convertView.findViewById(R.id.fav_up_btn1);
fav_up_btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
boolean favIsUp = fav_up_btn1
.getBackground()
.getConstantState()
.equals(my_context.getResources()
.getDrawable(R.drawable.fav_up_btn1)
.getConstantState());
// set the background
fav_up_btn1
.setBackgroundResource(favIsUp ? R.drawable.fav_dwn_btn1
: R.drawable.fav_up_btn1);
}
});
// Get a single video from our list
final Cmd video = videos.get(position);
// Set the image for the list item
// / thumb.setImageDrawable(video.getThumbUrl());
//thumb.setScaleType(ScaleType.FIT_XY);
// Set the title for the list item
title.setText(video.getTitle());
uploader.setText("by " + video.getUploader() + " | ");
return convertView;
}
public String getUploader() {
// TODO Auto-generated method stub
return null;
}
public String getviewCount() {
// TODO Auto-generated method stub
return null;
}
public CharSequence getTitle() {
// TODO Auto-generated method stub
return null;
}
public String getCmd() {
return cmd;
}
public void setCmd(String cmd) {
this.cmd = cmd;
}
public String getSuccess() {
return success;
}
public void setSuccess(String success) {
this.success = success;
}
public String getNumberOfVideos() {
return numberofvideos;
}
public void setNumberOfVideos(String numberofvideos) {
this.numberofvideos = numberofvideos;
}
public List<Cmd> getVideos() {
return videos;
}
public void setVideos(List<Cmd> videos) {
this.videos = videos;
}
public String getVideo() {
return video;
}
public void setVideo(String video) {
this.video = video;
}
public String getVideoName() {
return videoname;
}
public void setVideoName(String videoname) {
this.videoname = videoname;
}
public String getVideoURL() {
return videourl;
}
public void setVideoURL(String videourl) {
this.videourl = videourl;
}
@Override
public int getCount() {
return videos.size();
}
@Override
public Object getItem(int position) {
return videos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
return false;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
}
@Override
public boolean areAllItemsEnabled() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEnabled(int position) {
// TODO Auto-generated method stub
return false;
}
public String getId() {
// TODO Auto-generated method stub
return null;
}
}
SAXMLParser.java
public class SAXXMLParser {
public static List<Cmd> parse(InputStream is) {
List<Cmd> response = null;
try {
// create a XMLReader from SAXParser
XMLReader xmlReader = SAXParserFactory.newInstance().newSAXParser()
.getXMLReader();
// create a SAXXMLHandler
SAXXMLHandler saxHandler = new SAXXMLHandler();
// store handler in XMLReader
xmlReader.setContentHandler(saxHandler);
// the process starts
xmlReader.parse(new InputSource(is));
// get the `Video list`
response = saxHandler.getResponse();
} catch (Exception ex) {
Log.d("XML", "SAXXMLParser: parse() failed");
ex.printStackTrace();
}
// return video list
return response;
}
}
SAXMLHandler.java
public class SAXXMLHandler extends DefaultHandler {
private List<Cmd> videos;
private String tempVal;
// to maintain context
private Cmd cmd;
public SAXXMLHandler() {
videos = new ArrayList<Cmd>();
}
public List<Cmd> getResponse() {
return videos;
}
// Event Handlers
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
// reset
tempVal = "";
if (qName.equalsIgnoreCase("cmd")) {
// create a new instance of cmd
cmd = new Cmd();
}
}
public void characters(char[] ch, int start, int length)
throws SAXException {
tempVal = new String(ch, start, length);
}
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (qName.equalsIgnoreCase("videos")) {
// add it to the list
videos.add(cmd);
} else if (qName.equalsIgnoreCase("success")) {
cmd.setSuccess(tempVal);
} else if (qName.equalsIgnoreCase("numberofvideos")) {
cmd.setNumberOfVideos(tempVal);
} else if (qName.equalsIgnoreCase("videos")) {
cmd.setVideos(videos);
} else if (qName.equalsIgnoreCase("video")) {
cmd.setVideo(tempVal);
} else if (qName.equalsIgnoreCase("videoname")) {
cmd.setVideoName(tempVal);
} else if (qName.equalsIgnoreCase("videourl")) {
cmd.setVideoURL(tempVal);
}
}
}
parser_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/button" />
<ListView
android:id="@+id/cmdList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
XML 截图
附言
如果需要任何其他信息 - 请告诉我(接下来的几个小时我会在办公 table 前处理此问题，很乐意回答任何问题并及时接受任何答案)
最佳答案
在 SAXMLHandler.java 的 endElement() 中如果qName.equalsIgnoreCase("videos")，您只将命令添加到视频列表的方法.
在所有其他情况下，您修改了 cmd 但实际上并未将其添加到列表中。你想添加一个 videos.add(cmd) else if 中的声明 block 以及所有 cmd 都被添加到列表中。
这里的这个错误是您的 List<Cmd> videos 的原因只有一个项目，因此在您的 ListView 中只显示一个项目。
关于java - Android/Java - ListView 使用 ArrayList 填充 XML 数据 : Only Displays First Item，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21609224/