我想从此网址读取图像。
<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
<channel>
<title>podCast411</title>
<description>The 411 on podCasts, podCasters and podcasting</description>
<link>http://www.podcast411.com</link>
..
..
<itunes:explicit>No</itunes:explicit>
<itunes:image href="http://www.podcast411.com/img/411_itunes.jpg"/>
..
</channel>
</rss>
我可以使用以下代码从该提要中读取标题、描述。
Node results = doc.getDocumentElement();
Element docElement = doc.getDocumentElement();
NodeList childNodes = docElement.getChildNodes();
NodeList itemLinks = docElement.getElementsByTagName("item");
Log.d("TAG",
"Response:" + results.getLastChild() + " "
+ childNodes.getLength() + " " + itemLinks.getLength());
for (int i = 0; i < itemLinks.getLength(); i++) {
Element el = (Element) itemLinks.item(i);
NodeList itemTitle = el.getElementsByTagName("title");
Element itemFirst = (Element) itemTitle.item(0);
String nTitle = itemFirst.getFirstChild().getNodeValue();
NodeList itemdesc = el.getElementsByTagName("description");
Element itemFirstdesc = (Element) itemdesc.item(0);
String nDesc = stipHtml(itemFirstdesc.getFirstChild().getNodeValue());
}
public String stipHtml(String html) {
return Html.fromHtml(html).toString();
}
当我尝试使用相同的代码来读取 url 时,它不起作用。以下代码用于读取 imade url:
NodeList itemImage = el.getElementsByTagName("image");
String imageUrl = null;
for(i=0;i< itemImage.getLength();i++) {
Log.d("TAG", "Length of item is "+ itemImage.getLength());
Element itemFirstImage = (Element) itemImage.item(i);
NodeList url = itemFirstImage.getElementsByTagName("url");
Element link = (Element) url.item(i);
imageUrl = stipHtml(link.getFirstChild().getNodeValue());
}
我的代码有什么问题?
我的 logcat 是:它显示所有元素。
D/TAG ( 1901): List Data is called
D/TAG ( 1901): Temp is created.......
D/TAG ( 1901): RSS Data: title : Twelve-die-in-Himachal-road-accident description:Twelve people, all belonging to a village in Himachal Pradesh's Chamba district, were killed when a private vehicle skidded off the road and fell into a 700-metre-deep gorge on Sunday night, police officials said. http://feeds.hindustantimes.com/~r/HT-IndiaSectionPage-Topstories/~3/fUUMziwJedI/story01.htm null
D/TAG ( 1901): List Data is called
D/TAG ( 1901): Temp is created.......
D/TAG ( 1901): RSS Data: title : Twelve-die-in-Himachal-road-accident description:Twelve people, all belonging to a village in Himachal Pradesh's Chamba district, were killed when a private vehicle skidded off the road and fell into a 700-metre-deep gorge on Sunday night, police officials said. http://feeds.hindustantimes.com/~r/HT-IndiaSectionPage-Topstories/~3/fUUMziwJedI/story01.htm null
D/TAG ( 1901): List Data is called
D/TAG ( 1901): Temp is created.......
D/TAG ( 1901): RSS Data: title : Twelve-die-in-Himachal-road-accident description:Twelve people, all belonging to a village in Himachal Pradesh's Chamba district, were killed when a private vehicle skidded off the road and fell into a 700-metre-deep gorge on Sunday night, police officials said. http://feeds.hindustantimes.com/~r/HT-IndiaSectionPage-Topstories/~3/fUUMziwJedI/story01.htm null
最后,通过显示以下 logcat 强制关闭应用程序:
E/dalvikvm( 1901): Out of memory: Heap Size=24263KB, Allocated=23071KB, Bitmap Size=375KB
D/AndroidRuntime( 1901): Shutting down VM
W/dalvikvm( 1901): threadid=1: thread exiting with uncaught exception (group=0x400259f8)
I/dalvikvm-heap( 1901): Clamp target GC heap from 24.311MB to 24.000MB
D/dalvikvm( 1901): GC_FOR_MALLOC freed 18016 objects / 939208 bytes in 141ms
E/AndroidRuntime( 1901): FATAL EXCEPTION: main
E/AndroidRuntime( 1901): java.lang.OutOfMemoryError
E/AndroidRuntime( 1901): at android.text.SpannableStringBuilder.resizeFor(SpannableStringBuilder.java:137)
E/AndroidRuntime( 1901): at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:322)
E/AndroidRuntime( 1901): at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:275)
E/AndroidRuntime( 1901): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:438)
E/AndroidRuntime( 1901): at android.text.SpannableStringBuilder.append(SpannableStringBuilder.java:259)
E/AndroidRuntime( 1901): at android.text.HtmlToSpannedConverter.characters(Html.java:774)
E/AndroidRuntime( 1901): at org.ccil.cowan.tagsoup.Parser.pcdata(Parser.java:994)
E/AndroidRuntime( 1901): at org.ccil.cowan.tagsoup.HTMLScanner.save(HTMLScanner.java:614)
E/AndroidRuntime( 1901): at org.ccil.cowan.tagsoup.HTMLScanner.scan(HTMLScanner.java:557)
E/AndroidRuntime( 1901): at org.ccil.cowan.tagsoup.Parser.parse(Parser.java:449)
E/AndroidRuntime( 1901): at android.text.HtmlToSpannedConverter.convert(Html.java:411)
E/AndroidRuntime( 1901): at android.text.Html.fromHtml(Html.java:139)
E/AndroidRuntime( 1901): at android.text.Html.fromHtml(Html.java:102)
E/AndroidRuntime( 1901): at com.mistral.droidcast.SubscriptionActivity$RequestTask.stipHtml(SubscriptionActivity.java:134)
E/AndroidRuntime( 1901): at com.mistral.droidcast.SubscriptionActivity$RequestTask.onPostExecute(SubscriptionActivity.java:84)
E/AndroidRuntime( 1901): at com.mistral.droidcast.SubscriptionActivity$RequestTask.onPostExecute(SubscriptionActivity.java:1)
E/AndroidRuntime( 1901): at android.os.AsyncTask.finish(AsyncTask.java:417)
E/AndroidRuntime( 1901): at android.os.AsyncTask.access$300(AsyncTask.java:127)
E/AndroidRuntime( 1901): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
E/AndroidRuntime( 1901): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 1901): at android.os.Looper.loop(Looper.java:144)
E/AndroidRuntime( 1901): at android.app.ActivityThread.main(ActivityThread.java:4937)
E/AndroidRuntime( 1901): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 1901): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 1901): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime( 1901): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime( 1901): at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager( 103): Force finishing activity com.mistral.droidcast/.SubscriptionActivity
请给我任何其他方式来实现它。