我想获得这个链接工作。 我想要检索的RSS提要,并在文本视图显示它,
我已经试过了code,但似乎并不奏效。 我想有一些错误的code,但我不知道在哪里有它出了问题。 我是新来的机器人。
我需要帮助,请。
感谢。
下面是我的code。
MainActivity.java
公共类MainActivity延伸活动{
TextView的PSI;
类MyWeather {
字符串称号;
字符串描述;
公共字符串的toString(){
回归\正
+条件:+标题+\ N
+说明书+\ N的;
}
}
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
磅=(TextView中)findViewById(R.id.psi);
新MyAsyncTask()执行()。
}
公共类MyAsyncTask扩展的AsyncTask<虚空,虚空,虚空> {
ProgressDialog对话框;
MyWeather weatherResult;
@覆盖
在preExecute保护无效(){
// TODO自动生成方法存根
对话框=新ProgressDialog(MainActivity.this);
dialog.setMessage(请稍候...);
dialog.show();
super.on preExecute();
}
@覆盖
保护无效doInBackground(虚空...... PARAMS){
串weatherString = QueryYahooWeather();
文档weatherDoc = convertStringToDocument(weatherString);
weatherResult = parseWeather(weatherDoc);
文档DEST = NULL;
DocumentBuilderFactory的dbFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder的解析器;
尝试 {
解析器= dbFactory.newDocumentBuilder();
DEST = parser.parse(新ByteArrayInputStream的(src.getBytes()));
}赶上(E1的ParserConfigurationException){
e1.printStackTrace();
Toast.makeText(MainActivity.this,
e1.toString(),Toast.LENGTH_LONG).show();
}赶上(的SAXException E){
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(),Toast.LENGTH_LONG).show();
}赶上(IOException异常E){
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(),Toast.LENGTH_LONG).show();
}
返回DEST;
}
私人MyWeather parseWeather(文件weatherDoc){
MyWeather myWeather =新MyWeather();
//<描述>雅虎!天气纽约,NY< /描述>
//myWeather.description = srcDoc.getElementsByTagName(说明)
//.item(0)
// getTextContent();
。节点locationNode = srcDoc.getElementsByTagName(项目)项目(0);
myWeather.title = locationNode.getAttributes()
.getNamedItem(标题)
.getNodeValue()
的ToString();
myWeather.description = locationNode.getAttributes()
.getNamedItem(说明)
.getNodeValue()
的ToString();
返回myWeather;
}
}
}
私人文件convertStringToDocument(字符串weatherString){
// TODO自动生成方法存根
返回null;
}
私人字符串QueryYahooWeather(){
// TODO自动生成方法存根
字符串QRESULT =;
字符串查询字符串=app2.nea.gov.sg/data/rss/nea_psi.xml;
HttpClient的HttpClient的=新DefaultHttpClient();
HTTPGET HTTPGET =新HTTPGET(查询字符串);
尝试 {
HttpEntity httpEntity = httpClient.execute(HTTPGET).getEntity();
如果(httpEntity!= NULL){
InputStream中的InputStream = httpEntity.getContent();
读者=新的InputStreamReader(InputStream的);
BufferedReader中的BufferedReader =新的BufferedReader(中);
StringBuilder的StringBuilder的=新的StringBuilder();
字符串stringReadLine = NULL;
而((stringReadLine = bufferedreader.readLine())!= NULL){
stringBuilder.append(stringReadLine +\ N);
}
QRESULT = stringBuilder.toString();
}
}赶上(ClientProtocolException E){
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(),Toast.LENGTH_LONG).show();
}赶上(IOException异常E){
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(),Toast.LENGTH_LONG).show();
}
返回QRESULT;
}
@覆盖
保护无效onPostExecute(无效的结果){
// TODO自动生成方法存根
dialog.dismiss();
psi.setText(weatherResult.toString());
super.onPostExecute(结果);
}
activity_main.xml
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直
工具:上下文=MainActivity。>
<的TextView
机器人:ID =@ + ID /磅
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT/>
< / LinearLayout中>
解决方案
使用这种codeS ...!
进口的java.net.URL;
进口的java.util.ArrayList;
进口javax.xml.parsers.DocumentBuilder中;
进口javax.xml.parsers.DocumentBuilderFactory中;
进口org.w3c.dom.Document中;
进口org.w3c.dom.Element中;
进口org.w3c.dom.Node中;
进口org.w3c.dom.NodeList;
进口org.xml.sax.InputSource中;
进口android.app.Activity;
进口android.content.Context;
进口android.os.Bundle;
进口android.text.Html;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.BaseAdapter;
进口android.widget.ListView;
进口android.widget.TextView;
公共类XMLParsingDOMExample延伸活动{
ArrayList的<字符串>标题;
ArrayList的<字符串>描述;
ItemAdapter适配器1;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
ListView控件列表=(ListView控件)findViewById(R.id.list);
标题=新的ArrayList<字符串>();
说明=新的ArrayList<字符串>();
尝试 {
网址URL =新的URL(
http://app2.nea.gov.sg/data/rss/nea_psi.xml);
DocumentBuilderFactory的DBF = DocumentBuilderFactory.newInstance();
DocumentBuilder的DB = dbf.newDocumentBuilder();
文档的文档= db.parse(新的InputSource(url.openStream()));
doc.getDocumentElement()归()。
节点列表节点列表= doc.getElementsByTagName(项目);
的for(int i = 0; I< nodeList.getLength();我++){
节点node = nodeList.item(ⅰ);
元素fstElmnt =(元)节点;
节点列表名单= fstElmnt.getElementsByTagName(标题);
元件nameElement =(元件)nameList.item(0);
名单= nameElement.getChildNodes();
title.add(+((节点)nameList.item(0))getNodeValue());
节点列表websiteList = fstElmnt.getElementsByTagName(说明);
元件websiteElement =(元件)websiteList.item(0);
websiteList = websiteElement.getChildNodes();
description.add(+((节点)websiteList.item(0))getNodeValue());
}
}赶上(例外五){
的System.out.println(XML帕兴Excpetion =+ E);
}
适配器1 =新ItemAdapter(本);
list.setAdapter(适配器1);
}
类ItemAdapter扩展了BaseAdapter {
最后LayoutInflater mInflater;
私有类ViewHolder {
公众的TextView title_text;
公众的TextView des_text;
}
公共ItemAdapter(上下文的背景下){
// TODO自动生成构造函数存根
超();
mInflater =(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
// @覆盖
公众诠释getCount将(){
返回title.size();
}
// @覆盖
公共对象的getItem(INT位置){
返回的位置;
}
// @覆盖
众长getItemId(INT位置){
返回的位置;
}
// @覆盖
公共查看getView(最终诠释的立场,观点convertView,ViewGroup中父){
查看查看= convertView;
最后ViewHolder持有人;
如果(convertView == NULL){
鉴于= mInflater.inflate(R.layout.mainpage_listitem_activity,父母,假);
持有人=新ViewHolder();
holder.title_text =(TextView中)view.findViewById(R.id.title_text);
holder.des_text =(TextView中)view.findViewById(R.id.des_text);
view.setTag(保持器);
} 其他 {
支架=(ViewHolder)view.getTag();
}
holder.title_text.setText(+ title.get(位置));
holder.des_text.setText(+ Html.fromHtml(description.get(位置)));
返回查看;
}
}
}
main.xml中
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:方向=垂直
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
>
<的ListView
机器人:ID =@ + ID /列表
机器人:layout_width =match_parent
机器人:layout_height =WRAP_CONTENT
>
< / ListView控件>
< / LinearLayout中>
mainpage_listitem_activity.xml
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:方向=垂直
>
<的TextView
机器人:ID =@ + ID / title_text
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=称号
机器人:layout_margin =5DP
机器人:TEXTSIZE =22dp
机器人:文字颜色=#FFFFFF/>
<的TextView
机器人:ID =@ + ID / des_text
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:重力=中心
机器人:文本=说明
机器人:layout_margin =5DP
机器人:TEXTSIZE =18dp
机器人:文字颜色=#FFFFFF/>
< / LinearLayout中>
I would like to get this link " " working. I want to retrieve the RSS feed and display it in a text view,
I've tried out the code but doesn't seems to be working. I guess there is something wrong with the code but I'm not sure where has it gone wrong. I'm new to android.
I need help, please.
Thanks.
Here are my code.
MainActivity.java
public class MainActivity extends Activity {
TextView psi;
class MyWeather{
String title;
String description;
public String toString(){
return "\n- "
+ "Condition: " + title + "\n"
+ description +"\n";
}
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
psi = (TextView)findViewById(R.id.psi);
new MyAsyncTask().execute();
}
public class MyAsyncTask extends AsyncTask<Void, Void, Void> {
ProgressDialog dialog;
MyWeather weatherResult;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Please wait...");
dialog.show();
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
String weatherString = QueryYahooWeather();
Document weatherDoc = convertStringToDocument(weatherString);
weatherResult = parseWeather(weatherDoc);
Document dest = null;
DocumentBuilderFactory dbFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder parser;
try {
parser = dbFactory.newDocumentBuilder();
dest = parser.parse(new ByteArrayInputStream(src.getBytes()));
} catch (ParserConfigurationException e1) {
e1.printStackTrace();
Toast.makeText(MainActivity.this,
e1.toString(), Toast.LENGTH_LONG).show();
} catch (SAXException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
}
return dest;
}
private MyWeather parseWeather(Document weatherDoc) {
MyWeather myWeather = new MyWeather();
//<description>Yahoo! Weather for New York, NY</description>
//myWeather.description = srcDoc.getElementsByTagName("description")
//.item(0)
//.getTextContent();
Node locationNode = srcDoc.getElementsByTagName("item").item(0);
myWeather.title = locationNode.getAttributes()
.getNamedItem("title")
.getNodeValue()
.toString();
myWeather.description = locationNode.getAttributes()
.getNamedItem("description")
.getNodeValue()
.toString();
return myWeather;
}
}
}
private Document convertStringToDocument(String weatherString) {
// TODO Auto-generated method stub
return null;
}
private String QueryYahooWeather() {
// TODO Auto-generated method stub
String qResult = "";
String queryString = "app2.nea.gov.sg/data/rss/nea_psi.xml";
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(queryString);
try {
HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();
if (httpEntity != null){
InputStream inputStream = httpEntity.getContent();
Reader in = new InputStreamReader(inputStream);
BufferedReader bufferedreader = new BufferedReader(in);
StringBuilder stringBuilder = new StringBuilder();
String stringReadLine = null;
while ((stringReadLine = bufferedreader.readLine()) != null) {
stringBuilder.append(stringReadLine + "\n");
}
qResult = stringBuilder.toString();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
}
return qResult;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
dialog.dismiss();
psi.setText(weatherResult.toString());
super.onPostExecute(result);
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:id="@+id/psi"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
解决方案
Use this Codes...!
import java.net.URL;
import java.util.ArrayList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
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 android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class XMLParsingDOMExample extends Activity {
ArrayList<String> title;
ArrayList<String> description;
ItemAdapter adapter1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView list = (ListView) findViewById(R.id.list);
title = new ArrayList<String>();
description = new ArrayList<String>();
try {
URL url = new URL(
"http://app2.nea.gov.sg/data/rss/nea_psi.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("item");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element fstElmnt = (Element) node;
NodeList nameList = fstElmnt.getElementsByTagName("title");
Element nameElement = (Element) nameList.item(0);
nameList = nameElement.getChildNodes();
title.add(""+ ((Node) nameList.item(0)).getNodeValue());
NodeList websiteList = fstElmnt.getElementsByTagName("description");
Element websiteElement = (Element) websiteList.item(0);
websiteList = websiteElement.getChildNodes();
description.add(""+ ((Node) websiteList.item(0)).getNodeValue());
}
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
adapter1 = new ItemAdapter(this);
list.setAdapter(adapter1);
}
class ItemAdapter extends BaseAdapter {
final LayoutInflater mInflater;
private class ViewHolder {
public TextView title_text;
public TextView des_text;
}
public ItemAdapter(Context context) {
// TODO Auto-generated constructor stub
super();
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
//@Override
public int getCount() {
return title.size();
}
//@Override
public Object getItem(int position) {
return position;
}
//@Override
public long getItemId(int position) {
return position;
}
//@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = mInflater.inflate(R.layout.mainpage_listitem_activity, parent, false);
holder = new ViewHolder();
holder.title_text = (TextView) view.findViewById(R.id.title_text);
holder.des_text = (TextView) view.findViewById(R.id.des_text);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.title_text.setText(""+title.get(position));
holder.des_text.setText(""+Html.fromHtml(description.get(position)));
return view;
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</ListView>
</LinearLayout>
mainpage_listitem_activity.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"
>
<TextView
android:id="@+id/title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="title"
android:layout_margin="5dp"
android:textSize="22dp"
android:textColor="#FFFFFF"/>
<TextView
android:id="@+id/des_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="description "
android:layout_margin="5dp"
android:textSize="18dp"
android:textColor="#FFFFFF"/>
</LinearLayout>