Java Android:简单的XML SAX解析器-反复显示相同的数据
我创建了一个XML解析器,它用从XML文件获得的数据填充listView。问题在于,出于某种原因,listView反复显示相同的数据,而不是每个listView项的唯一数据 我不确定到底是什么导致了这个问题-任何洞察都是非常感谢的 截图: XML数据:Java Android:简单的XML SAX解析器-反复显示相同的数据,java,android,xml,listview,sax,Java,Android,Xml,Listview,Sax,我创建了一个XML解析器,它用从XML文件获得的数据填充listView。问题在于,出于某种原因,listView反复显示相同的数据,而不是每个listView项的唯一数据 我不确定到底是什么导致了这个问题-任何洞察都是非常感谢的 截图: XML数据: 获取视频 1. 4. iPod样本 http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/06087297988b.m4v 样本mpeg4 http://
获取视频
1.
4.
iPod样本
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/06087297988b.m4v
样本mpeg4
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/b5ed9e7100e2.mp4
索伦森样本
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/2a8e64b24997.mov
iTunes示例
http://mobile.example.com/api/wp-content/uploads/sites/6/2014/01/api/1/6c7f65254aad.mov
示例/教程:
SAXXMLHandler.java
公共类SAXXMLHandler扩展了DefaultHandler{
私人名单视频;
私有字符串tempVal;
//维护上下文
私人Cmd;
公共SAXXMLHandler(){
视频=新的ArrayList();
}
公共列表getResponse(){
返回视频;
}
//事件处理程序
public void startElement(字符串uri、字符串localName、字符串qName、,
属性)引发SAX异常{
//重置
tempVal=“”;
if(qName.equalsIgnoreCase(“视频”)){
//创建cmd的新实例
cmd=新cmd();
}
}
公共无效字符(字符[]ch,整数开始,整数长度)
抛出SAX异常{
tempVal=新字符串(ch、start、length);
}
公共void endElement(字符串uri、字符串localName、字符串qName)
抛出SAX异常{
if(qName.equalsIgnoreCase(“视频”)){
//将其添加到列表中
}else if(qName.equalsIgnoreCase(“成功”)){
命令setSuccess(临时值);
}else if(qName.equalsIgnoreCase(“numberofvideos”)){
cmd.setNumberOfVideos(tempVal);
}else if(qName.equalsIgnoreCase(“视频”)){
cmd.setVideos(视频);
}else if(qName.equalsIgnoreCase(“视频”)){
cmd.setVideo(tempVal);
}else if(qName.equalsIgnoreCase(“videoname”)){
cmd.setVideoName(tempVal);
}else if(qName.equalsIgnoreCase(“videourl”)){
cmd.setVideoURL(tempVal);
videos.add(cmd);//您只需要存储cmd的一个实例
}
}
}
CustomListViewAdapter.java
公共类CustomListViewAdapter扩展了ArrayAdapter{
活动语境;
列出视频;
公共CustomListViewAdapter(活动上下文、列表视频){
超级(上下文、R.layout.list_item2、视频);
this.context=上下文;
这个。视频=视频;
}
/*私有视图持有者类*/
私有类视窗持有者{
图像视图图像视图;
TextView txtSuccess;
TextView-txtCmd;
TextView txtPrice;
}
public Cmd getItem(int位置){
返回视频。获取(位置);
}
公共视图getView(int位置、视图转换视图、视图组父视图){
视窗座;
LayoutInflater充气器=上下文。getLayoutInflater();
if(convertView==null){
convertView=充气机充气(R.layout.list_item2,空);
holder=新的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.缩略图);
convertView.setTag(支架);
}否则{
holder=(ViewHolder)convertView.getTag();
}
Cmd=(Cmd)getItem(位置);
holder.txtsucture.setText(cmd.getSuccess());
holder.txtCmd.setText(cmd.getCmd());
//holder.imageView.setImageBitmap(cmd.getImageBitmap());
holder.txtPrice.setText(cmd.getVideoName()+);
返回视图;
}
}
SAXParserAsyncTaskActivity.java
公共类SAXParserAsyncTaskActivity扩展活动实现
OnClickListener,OnItemClickListener{
按钮;
列表视图列表视图;
列表视频=新建ArrayList();
自定义listViewAdapter listViewAdapter;
静态最终字符串URL=”http://mobile.example.com/api/xmlrpc.php?cmd=getVideos&username=fake&password=credential";
公共静态最终字符串LIBRARY=“LIBRARY”;
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.parser_main);
findViewsById();
setOnClickListener(此);
setOnItemClickListener(this);
GetXMLTask任务=新的GetXMLTask(此任务);
执行(新字符串[]{URL});
}
私有void findViewsById(){
按钮=(按钮)findViewById(R.id.button);
listView=(listView)findViewById(R.id.cmdList);
}
@凌驾
public void onItemClick(AdapterView父视图、视图、整型位置、,
长id){
}
@凌驾
公共void onClick(视图){
//GetXMLTask任务=新的GetXMLTask(此任务);
//执行(新字符串[]{URL});
}
//私有内部类扩展异步任务
私有类GetXMLTask扩展了AsyncTask{
私人活动语境;
公共GetXMLTask(活动上下文){
this.context=上下文;
}
受保护的void onPostExecute(列出视频){
listViewAdapter=新的CustomListViewAdapter(上下文、视频);
setAdapter(listViewAdapter);
}
/*
*使用HttpURLConnection从Android发出Http下载请求
*XML文件
*/
私有字符串getXmlFromUrl(字符串urlString){
<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>
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("Video")) {
// 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
} 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);
videos.add(cmd); //You only need store an instance of your Cmd
}
}
}
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;
}
}
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/xmlrpc.php?cmd=getVideos&username=fake&password=credential";
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);
if ( videos == null) {
Toast.makeText(getApplicationContext(), "Videos is null!)",
Toast.LENGTH_LONG).show();
}
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;
}
}
}
if (qName.equalsIgnoreCase("cmd")) {
// create a new instance of cmd
cmd = new Cmd();
}
if (qName.equalsIgnoreCase("Video")) {
// create a new instance of cmd
cmd = new Cmd();
}
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (qName.equalsIgnoreCase("videos")) {
// add it to the list
/*} 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);
videos.add(cmd); //You only need store an instance of your Cmd
}
}