Android 从HTTP读取XML
我正在尝试从internet读取xml文件 这是我正在使用的代码:Android 从HTTP读取XML,android,xml,Android,Xml,我正在尝试从internet读取xml文件 这是我正在使用的代码: HttpClient client = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://www.mypage.com/version.xml"); HttpResponse resp = client.execute(httppost); 我得到了这个前男友: android.os.NetworkOnMainThreadException 我正
HttpClient client = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.mypage.com/version.xml");
HttpResponse resp = client.execute(httppost);
我得到了这个前男友:
android.os.NetworkOnMainThreadException
我正试图用一个异步方法来实现这一点,方法如下所示。
这是我尝试的代码:
public class Download extends AsyncTask<String, Void, Document> {
@SuppressWarnings("unused")
private Exception exception;
public Document document;
public Download(String url)
{
this.execute(url);
}
@Override
protected Document doInBackground(String... url) {
try {
HttpUriRequest request = new HttpGet(url.toString());
HttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(request);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse(response.getEntity().getContent());
return document;
} else {
throw new IOException("Download failed, HTTP response code "
+ statusCode + " - " + statusLine.getReasonPhrase());
}
} catch (Exception e) {
exception = e;
return null;
}
}
protected void onPostExecute(Document doc)
{
// TODO: check this.exception
// TODO: do something with the feed
document = doc;
}
}
公共类下载扩展异步任务{
@抑制警告(“未使用”)
私人例外;
公共文件;
公开下载(字符串url)
{
执行(url);
}
@凌驾
受保护文档doInBackground(字符串…url){
试一试{
HttpUriRequest request=newhttpget(url.toString());
HttpClient HttpClient=新的DefaultHttpClient();
HttpResponse response=httpClient.execute(请求);
StatusLine StatusLine=response.getStatusLine();
int statusCode=statusLine.getStatusCode();
如果(状态代码==200){
DocumentBuilderFactory工厂=DocumentBuilderFactory.newInstance();
DocumentBuilder=factory.newDocumentBuilder();
document=builder.parse(response.getEntity().getContent());
归还文件;
}否则{
抛出新IOException(“下载失败,HTTP响应代码”
+statusCode+“-”+statusLine.GetReasonPhase());
}
}捕获(例外e){
例外=e;
返回null;
}
}
后期执行时受保护的无效(文档文档)
{
//TODO:检查此项。异常
//TODO:对提要做些什么
文件=文件;
}
}
但是文档为空。尝试在
异步任务
中包含Web调用逻辑
仅供参考,您可以在AsyncTask的
doInBackground()方法中执行后台处理。您是否阅读了异常?使用后台线程。最好避免在主线程上进行网络操作。检查此线程:或使用AsyncTaskLoader