列表视图RSS阅读器崩溃 [英] Listview RSS reader crashes
本文介绍了列表视图RSS阅读器崩溃的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图让阅读RSS提要的应用程序。我做了应用程序,但它不会加载源。我会给你code所以你可以告诉我,我可以改变,以使应用程序正常工作。我不知道是什么问题。有一个在code没有错误,但它不会加载源。
ListActivity.java:
包com.listview;
进口java.net.MalformedURLException;
进口的java.net.URL;
进口的java.util.ArrayList;
进口的java.util.HashMap;
进口javax.xml.parsers.SAXParser中;
进口javax.xml.parsers.SAXParserFactory中;
进口org.xml.sax.Attributes;
进口org.xml.sax.InputSource中;
进口org.xml.sax.SAXException;
进口org.xml.sax.XMLReader中;
进口org.xml.sax.helpers.DefaultHandler中;
进口android.app.Activity;
进口android.app.ProgressDialog;
进口android.content.Intent;
进口android.net.Uri;
进口android.os.AsyncTask;
进口android.os.Bundle;
进口android.view.View;
进口android.widget.AdapterView;
进口android.widget.AdapterView.OnItemClickListener;
进口android.widget.ListAdapter;
进口android.widget.ListView;
公共类ListActivity延伸活动{
ListView控件LV1;
ProgressDialog ShowProgress;
公众的ArrayList<邮政> PostList =新的ArrayList<邮政>();
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_list);
LV1 =(ListView控件)findViewById(R.id.listView1);
ShowProgress = ProgressDialog.show(ListActivity.this,,请耐心等待...,真正的);
新loadingTask()执行(av-gurus.blogspot.com/feeds/posts/default/);
lv1.setOnItemClickListener(新OnItemClickListener(){
公共无效onItemClick(适配器视图<>母公司视图中查看,
INT位置,长的id){
意向意图=新的意图(Intent.ACTION_VIEW).setData(URI
.parse(PostList.get(位置).getUrl()));
startActivity(意向);
}
});
}
类loadingTask扩展的AsyncTask<字符串,太虚,字符串> {
@覆盖
保护字符串doInBackground(字符串...网址){
SAXHelper SH = NULL;
尝试
{
的sh =新SAXHelper(网址[0]);
}赶上(MalformedURLException异常E){
e.printStackTrace();
}
sh.parseContent();
返回 ;
}
保护无效onPostExecute(String s)将{
lv1.setAdapter(新EfficientAdapter(ListActivity.this,PostList));
ShowProgress.dismiss();
}
}
类SAXHelper {
公众的HashMap<字符串,字符串>用户列表=新的HashMap<字符串,字符串>();
私人URL URL2;
公共SAXHelper(字符串为url1)抛出MalformedURLException的{
this.url2 =新的URL(URL1);
}
公众位于RSSHandler parseContent(字符串parseContent){
位于RSSHandler DF =新位于RSSHandler();
尝试 {
的SAXParserFactory SPF = SAXParserFactory.newInstance();
的SAXParser藻= spf.newSAXParser();
XMLReader的XR = sp.getXMLReader();
xr.setContentHandler(DF);
xr.parse(新的InputSource(url2.openStream()));
}赶上(例外五){
e.printStackTrace();
}
返回DF;
}
}
类位于RSSHandler扩展的DefaultHandler {
私人邮政currentPost =新邮();
StringBuffer的字符=新的StringBuffer();
@覆盖
公共无效的startElement(URI字符串,字符串的localName,字符串QNAME,
属性的ATT){
字符=新的StringBuffer();
如果(localName.equalsIgnoreCase(项目)){
}
}
@覆盖
公共无效的endElement(URI字符串,字符串的localName,字符串QNAME)
抛出的SAXException {
如果(localName.equalsIgnoreCase(标题)
&功放;&安培; currentPost.getTitle()== NULL){
currentPost.setTitle(chars.toString());
}
如果(localName.equalsIgnoreCase(pubdate的)
&功放;&安培; currentPost.getPubDate()== NULL){
currentPost.setPubDate(chars.toString());
}
如果(localName.equalsIgnoreCase(缩略图)
&功放;&安培; currentPost.getThumbnail()== NULL){
currentPost.setThumbnail(chars.toString());
}
如果(localName.equalsIgnoreCase(链接)
&功放;&安培; currentPost.getUrl()== NULL){
currentPost.setUrl(chars.toString());
}
如果(localName.equalsIgnoreCase(项目)){
PostList.add(currentPost);
currentPost =新邮();
}
}
@覆盖
公共无效字符(字符CH [],诠释开始,诠释长度){
chars.append(新的String(CH,开始,长度));
}
}
}
Post.java:
包com.listview;
公共类帖子{
私人字符串名称;
私人字符串缩略图;
私人字符串URL;
私人字符串描述;
私人字符串pubdate的;
公共字符串的getTitle(){
返回称号;
}
公共无效的setTitle(字符串名称){
this.title =称号;
}
公共字符串getThumbnail(){
返回缩略图;
}
公共无效setThumbnail(字符串缩略图){
this.thumbnail =缩略图;
}
公共字符串的getURL(){
返回URL;
}
公共无效setUrl(字符串URL){
this.url =网址;
}
公共无效setDescription(字符串描述){
this.description =描述;
}
公共字符串getDescription(){
返回描述;
}
公共无效setPubDate(字符串pubdate的){
this.pubDate = pubdate的;
}
公共字符串getPubDate(){
返回pubdate的;
}
}
EfficientAdapter.java:
包com.listview;
进口java.io.IOException异常;
进口的java.io.InputStream;
进口java.net.MalformedURLException;
进口的java.net.URL;
进口的java.util.ArrayList;
进口android.app.Activity;
进口android.content.Context;
进口android.graphics.Bitmap;
进口android.graphics.BitmapFactory;
进口android.graphics.drawable.Drawable;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.BaseAdapter;
进口android.widget.ImageView;
进口android.widget.TextView;
公共类EfficientAdapter扩展了BaseAdapter {
私人活动的活动;
私人的ArrayList<邮政>数据;
私有静态LayoutInflater吹气= NULL;
//公共ImageLoader的ImageLoader的;
ViewHolder持有人;
EfficientAdapter(活动一,ArrayList的<邮政和GT; D){
活性= A;
数据= D;
充气=(LayoutInflater)活动
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// ImageLoader的=新ImageLoader的(activity.getApplicationContext());
}
@覆盖
公众诠释getCount将(){
返回data.toArray()的长度。
}
@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;
}
公共静态类ViewHolder {
公众的TextView标签;
公共TextView的地址;
公众ImageView的形象;
}
@覆盖
公共查看getView(INT位置,查看convertView,ViewGroup中父){
查看VI = convertView;
如果(convertView == NULL){
VI = inflater.inflate(R.layout.row,NULL);
持有人=新ViewHolder();
holder.label =(TextView中)vi.findViewById(R.id.title);
holder.addr =(TextView中)vi.findViewById(R.id.details);
holder.image =(ImageView的)vi.findViewById(R.id.thumb);
vi.setTag(保持器);
} 其他
支架=(ViewHolder)vi.getTag();
holder.label.setText(data.get(位置).getTitle());
holder.addr.setText(data.get(位置).getPubDate());
imageLoader.DisplayImage((data.get(位置).getThumbnail()),活动,
holder.image,72,72);
网址URL = NULL;
尝试 {
URL =新的URL((data.get(位置).getThumbnail()));
}赶上(MalformedURLException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}
InputStream的内容= NULL;
尝试 {
内容=(InputStream中)url.getContent();
}赶上(IOException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}
绘制对象D = Drawable.createFromStream(内容,SRC);
位图mIcon1 = NULL;
尝试 {
mIcon1 =
BitmapFactory.de codeStream(url.openConnection()的getInputStream());
}赶上(IOException异常E){
e.printStackTrace();
}
holder.image.setImageBitmap(Bitmap.createScaledBitmap(mIcon1,72,72,FALSE));
返回六;
}
}
activity_list.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
工具:上下文=。ListActivity>
<的ListView
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:scrollingCache =假
机器人:后台=#FFFFFF
机器人:cacheColorHint =#00000000
机器人:ID =@ + ID / ListView1的>
< / ListView控件>
< / LinearLayout中>
row.xml:
< XML版本=1.0编码=UTF-8&GT?;
< RelativeLayout的机器人:ID =@ + ID / widget30
机器人:layout_width =FILL_PARENT机器人:layout_height =WRAP_CONTENT
机器人:填充=4dip的xmlns:机器人=http://schemas.android.com/apk/res/android>
< TextView的机器人:ID =@ + ID /详细信息机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT机器人:文本=TextView的
机器人:文字颜色=#000000机器人:layout_toRightOf =@ + ID /图标
机器人:layout_alignLeft =@ + ID /标题机器人:layout_alignRight =@ + ID /标题
机器人:layout_below =@ + ID /标题机器人:layout_marginRight =5px的>
< / TextView的>
< TextView的机器人:ID =@ + ID /标题机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT机器人:文本=TextView的
机器人:TEXTSTYLE =黑体机器人:文字颜色=#000000
机器人:layout_marginTop =5px的机器人:layout_toRightOf =@ + ID /图标
机器人:layout_marginRight =5px的>
< / TextView的>
< ImageView的机器人:ID =@ + ID /箭头机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT机器人:填充=0px
机器人:layout_marginRight =10px的机器人:SRC =@可绘制/ ic_launcher
机器人:layout_alignRight =@ + ID /图标机器人:layout_alignParentRight =真
机器人:layout_centerVertical =真正的>
< / ImageView的>
< ImageView的机器人:ID =@ + ID /拇指机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT机器人:layout_marginRight =10px的
机器人:layout_centerVertical =真正的机器人:layout_alignParentLeft =真
机器人:SRC =@可绘制/ ic_launcher机器人:=了minWidth72dip
机器人:=了minHeight72dip机器人:=了maxWidth72dip机器人:=了maxHeight72dip>
< / ImageView的>
< / RelativeLayout的>
日志 http://pastebin.com/wnEZE92F
解决方案
av-gurus.blogspot.com/feeds/posts/default/
这应该是与 HTTP
计划启动(的http://
)
I am trying to make application for reading rss feeds. I made app,but it wont load feeds. I will give you code so you can tell me what I can change to make app working properly. I don't know what the problem is. There is no errors in code but it wont load feeds.
ListActivity.java:
package com.listview;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
public class ListActivity extends Activity {
ListView lv1;
ProgressDialog ShowProgress;
public ArrayList<Post> PostList = new ArrayList<Post>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
lv1 = (ListView)findViewById(R.id.listView1);
ShowProgress = ProgressDialog.show(ListActivity.this,"","Loading. Please wait...",true);
new loadingTask().execute("av-gurus.blogspot.com/feeds/posts/default/");
lv1.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,View view,
int position, long id){
Intent intent = new Intent(Intent.ACTION_VIEW).setData(Uri
.parse(PostList.get(position).getUrl()));
startActivity(intent);
}
});
}
class loadingTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
SAXHelper sh = null;
try
{
sh = new SAXHelper(urls[0]);
}catch (MalformedURLException e){
e.printStackTrace();
}
sh.parseContent("");
return "";
}
protected void onPostExecute(String s) {
lv1.setAdapter(new EfficientAdapter(ListActivity.this, PostList));
ShowProgress.dismiss();
}
}
class SAXHelper{
public HashMap<String, String> userList = new HashMap<String, String>();
private URL url2;
public SAXHelper(String url1) throws MalformedURLException {
this.url2 = new URL(url1);
}
public RSSHandler parseContent(String parseContent) {
RSSHandler df = new RSSHandler();
try {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
xr.setContentHandler(df);
xr.parse(new InputSource(url2.openStream()));
} catch (Exception e) {
e.printStackTrace();
}
return df;
}
}
class RSSHandler extends DefaultHandler {
private Post currentPost = new Post();
StringBuffer chars = new StringBuffer();
@Override
public void startElement(String uri, String localName, String qName,
Attributes atts) {
chars = new StringBuffer();
if (localName.equalsIgnoreCase("item")) {
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (localName.equalsIgnoreCase("title")
&& currentPost.getTitle() == null) {
currentPost.setTitle(chars.toString());
}
if (localName.equalsIgnoreCase("pubDate")
&& currentPost.getPubDate() == null) {
currentPost.setPubDate(chars.toString());
}
if (localName.equalsIgnoreCase("thumbnail")
&& currentPost.getThumbnail() == null) {
currentPost.setThumbnail(chars.toString());
}
if (localName.equalsIgnoreCase("link")
&& currentPost.getUrl() == null) {
currentPost.setUrl(chars.toString());
}
if (localName.equalsIgnoreCase("item")) {
PostList.add(currentPost);
currentPost = new Post();
}
}
@Override
public void characters(char ch[], int start, int length) {
chars.append(new String(ch, start, length));
}
}
}
Post.java:
package com.listview;
public class Post {
private String title;
private String thumbnail;
private String url;
private String description;
private String pubDate;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getThumbnail() {
return thumbnail;
}
public void setThumbnail(String thumbnail) {
this.thumbnail = thumbnail;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public void setDescription(String description) {
this.description = description;
}
public String getDescription() {
return description;
}
public void setPubDate(String pubDate) {
this.pubDate = pubDate;
}
public String getPubDate() {
return pubDate;
}
}
EfficientAdapter.java:
package com.listview;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class EfficientAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<Post> data;
private static LayoutInflater inflater = null;
//public ImageLoader imageLoader;
ViewHolder holder;
EfficientAdapter(Activity a, ArrayList<Post> d) {
activity = a;
data = d;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// imageLoader = new ImageLoader(activity.getApplicationContext());
}
@Override
public int getCount() {
return data.toArray().length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public static class ViewHolder {
public TextView label;
public TextView addr;
public ImageView image;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null) {
vi = inflater.inflate(R.layout.row, null);
holder = new ViewHolder();
holder.label = (TextView) vi.findViewById(R.id.title);
holder.addr = (TextView) vi.findViewById(R.id.details);
holder.image = (ImageView) vi.findViewById(R.id.thumb);
vi.setTag(holder);
} else
holder = (ViewHolder) vi.getTag();
holder.label.setText(data.get(position).getTitle());
holder.addr.setText(data.get(position).getPubDate());
imageLoader.DisplayImage((data.get(position).getThumbnail()), activity,
holder.image, 72, 72);
URL url = null;
try {
url = new URL((data.get(position).getThumbnail()));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InputStream content = null;
try {
content = (InputStream)url.getContent();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Drawable d = Drawable.createFromStream(content , "src");
Bitmap mIcon1 = null;
try {
mIcon1 =
BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
holder.image.setImageBitmap(Bitmap.createScaledBitmap(mIcon1, 72, 72, false));
return vi;
}
}
activity_list.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"
tools:context=".ListActivity" >
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollingCache="false"
android:background="#ffffff"
android:cacheColorHint="#00000000"
android:id="@+id/listView1">
</ListView>
</LinearLayout>
row.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/widget30"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:padding="4dip" xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:id="@+id/details" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="TextView"
android:textColor="#000000" android:layout_toRightOf="@+id/icon"
android:layout_alignLeft="@+id/title" android:layout_alignRight="@+id/title"
android:layout_below="@+id/title" android:layout_marginRight="5px">
</TextView>
<TextView android:id="@+id/title" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="TextView"
android:textStyle="bold" android:textColor="#000000"
android:layout_marginTop="5px" android:layout_toRightOf="@+id/icon"
android:layout_marginRight="5px">
</TextView>
<ImageView android:id="@+id/arrow" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:padding="0px"
android:layout_marginRight="10px" android:src="@drawable/ic_launcher"
android:layout_alignRight="@+id/icon" android:layout_alignParentRight="true"
android:layout_centerVertical="true">
</ImageView>
<ImageView android:id="@+id/thumb" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_marginRight="10px"
android:layout_centerVertical="true" android:layout_alignParentLeft="true"
android:src="@drawable/ic_launcher" android:minWidth="72dip"
android:minHeight="72dip" android:maxWidth="72dip" android:maxHeight="72dip">
</ImageView>
</RelativeLayout>
LOG http://pastebin.com/wnEZE92F
解决方案
"av-gurus.blogspot.com/feeds/posts/default/"
this should be start with the http
scheme (http://
)
这篇关于列表视图RSS阅读器崩溃的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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