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Android XML Parser显示重复数据(Android XML Parser Displays Duplicate Data)

编程入门 行业动态 更新时间:2024-10-28 10:21:18
Android XML Parser显示重复数据(Android XML Parser Displays Duplicate Data)

我为android构建了一个基于SAX的XML解析器，但是当我尝试执行它时，我得到了重复的数据。 我不确定我做错了什么（之前我遇到过类似的问题，问题在于线路问题： if (qName.equalsIgnoreCase("Video")) {但我看了代码多次，所以我不确定我能做些什么来解决问题和/或如何防止重复数据。

截图

SAXXMLHandler.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("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("videos")) { cmd.setSuccess(tempVal); } else if (qName.equalsIgnoreCase("videos")) { 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 } } }

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 void run() { Intent intent = new Intent(context, ViewVideo.class); String txt=Cmd.getVideoURL(); intent.putExtra("videofilename", txt); context.startActivity(intent); } 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(); } final Cmd cmd = (Cmd) getItem(position); holder.txtSuccess.setText(cmd.getVideoName()); holder.txtSuccess.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); holder.txtCmd.setText(cmd.getCmd()); holder.txtCmd.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); holder.txtPrice.setText(cmd.getVideoURL() + ""); holder.txtPrice.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); holder.imageView.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); return convertView; } }

SAXParserAsyncTaskActivity.java

public class SAXParserAsyncTaskActivity extends Activity implements OnClickListener, OnItemClickListener { 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=fake"; public static final String LIBRARY = "Library"; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.parser_main); findViewsById(); listView.setOnItemClickListener(this); GetXMLTask task = new GetXMLTask(this); task.execute(new String[] { URL }); } private void findViewsById() { listView = (ListView) findViewById(R.id.cmdList); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { } @Override public void onClick(View view) { } // 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); } 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(); } } return videos; } } }

Cmd.java

public class Cmd implements ListAdapter { private String success; private String cmd; List<Cmd> videos; private String video; private String numberofvideos; private static String videoname; private static String videourl; private LayoutInflater mInflater; Button fav_up_btn1; Button fav_dwn_btn1; Context my_context; 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 static String getVideoName() { return videoname; } public void setVideoName(String videoname) { this.videoname = videoname; } public static 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; } }

XML

<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>

I've built a SAX based XML parser for android however I'm getting duplicate data when I attempt to execute it. I'm not sure exactly what I've done wrong (I had a similar issue once before and the issue lied with a problem on the line: if (qName.equalsIgnoreCase("Video")) { however I've looked the code over several times so I'm not sure exactly what I can do to resolve the issue and or how to prevent the duplicate data.

Screenshot

SAXXMLHandler.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("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("videos")) { cmd.setSuccess(tempVal); } else if (qName.equalsIgnoreCase("videos")) { 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 } } }

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 void run() { Intent intent = new Intent(context, ViewVideo.class); String txt=Cmd.getVideoURL(); intent.putExtra("videofilename", txt); context.startActivity(intent); } 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(); } final Cmd cmd = (Cmd) getItem(position); holder.txtSuccess.setText(cmd.getVideoName()); holder.txtSuccess.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); holder.txtCmd.setText(cmd.getCmd()); holder.txtCmd.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); holder.txtPrice.setText(cmd.getVideoURL() + ""); holder.txtPrice.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); holder.imageView.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { run(); } }); return convertView; } }

SAXParserAsyncTaskActivity.java

public class SAXParserAsyncTaskActivity extends Activity implements OnClickListener, OnItemClickListener { 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=fake"; public static final String LIBRARY = "Library"; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.parser_main); findViewsById(); listView.setOnItemClickListener(this); GetXMLTask task = new GetXMLTask(this); task.execute(new String[] { URL }); } private void findViewsById() { listView = (ListView) findViewById(R.id.cmdList); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { } @Override public void onClick(View view) { } // 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); } 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(); } } return videos; } } }

Cmd.java

public class Cmd implements ListAdapter { private String success; private String cmd; List<Cmd> videos; private String video; private String numberofvideos; private static String videoname; private static String videourl; private LayoutInflater mInflater; Button fav_up_btn1; Button fav_dwn_btn1; Context my_context; 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 static String getVideoName() { return videoname; } public void setVideoName(String videoname) { this.videoname = videoname; } public static 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; } }

XML

<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>

最满意答案

1）您不需要将对象Cmd声明为适配器，为什么有2个适配器：P！

2）你的变量videoname和videourl是static ！这就是你获得相同值的原因，改为：

private String videoname; private String videourl;

你只需要一个对象Cmd ，如下所示：

public class Cmd { private String success; private String cmd; List<Cmd> videos; private String video; private String numberofvideos; private String videoname; private String videourl; 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; } }

1) You don´t need to declare your object Cmd as an Adapter, why 2 adapters :P!

2) your variables videoname and videourl are static!, thats the reason for what you are gettin the same values,change to:

private String videoname; private String videourl;

you only need an object Cmd as follows:

public class Cmd { private String success; private String cmd; List<Cmd> videos; private String video; private String numberofvideos; private String videoname; private String videourl; 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; } }

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