有人可以幫我一些文件下載代碼

Question

您好我正在製作一個應用程序，獲取一個XML文件，並顯示結果與一個按鈕標記得到它。我需要點擊按鈕時的幫助，它會將xml文件中的.pkg文件url和下載的某種進度報告一起下載。任何幫助將提前感謝真棒。這是我到目前爲止它在下載代碼中有錯誤我試過也許有人可以爲我解決這個問題。我也難以鏈接到.pkg文件

package com.mypackagename;

import java.io.IOException; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.List; import javax.net.ssl.HttpsURLConnection; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.params.ClientPNames; import org.apache.http.client.params.CookiePolicy; import org.apache.http.entity.StringEntity; import org.apache.http.protocol.HttpContext; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import android.app.Activity; import android.app.ListActivity; import android.content.Context; import android.content.Intent; import android.content.DialogInterface.OnClickListener; import android.graphics.drawable.Drawable; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView;

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.net.URLConnection;

import org.apache.http.util.ByteArrayBuffer;

import android.util。登錄;

public class MainActivity extends ListActivity {String 0} XML_URL =「http://www.mysite.com/book.xml」; 私人DocumentBuilder docBuilder; private document doc; private DocumentBuilderFactory docBuilderFactory; private String bookImageUrl; private int nodeListbooksLength; private String bookId; private String bookUrl; private String bookDescription; private String bookTitle;

ButtonListMenuAdapter notes; 
ArrayList<Book> list; 
TextView tv_title; 
ImageView iv_logo; 
private String Title; 
    Drawable booksImagesList[]; 


/** Called when the activity is first created. 1 */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    tv_title = (TextView) findViewById(R.id.TextView01); 
    iv_logo = (ImageView) findViewById(R.id.ImageView01); 
    list = new ArrayList<Book>(); 
    parseXML(); 
    notes = new ButtonListMenuAdapter( 
      this, 
      R.layout.book_row, 
      list); 
    setListAdapter(notes); 
} 
private void parseXML() 
{ 
    try{ 
     Log.d("MainActivity", "Connecting Server"); 
     InputStream inStream =openHttpConnection(XML_URL); 
     Log.d("MainActivity", "Fetching Data Completed"); 
     if(inStream!=null){ 
      docBuilderFactory = DocumentBuilderFactory.newInstance(); 
      docBuilderFactory.setCoalescing(true); 
      docBuilder = docBuilderFactory.newDocumentBuilder(); 
      docBuilder.isValidating(); 
      doc = docBuilder.parse(inStream); 


      NodeList nodeListbookTitle = doc.getDocumentElement().getElementsByTagName("Title1"); 
      if(nodeListbookTitle.getLength()>0){ 
       Element elementbooktitile = (Element) nodeListbookTitle.item(0); 
       NodeList nodeListElementbooktitle = elementbooktitile.getChildNodes(); 
       if(nodeListElementbooktitle.getLength()>0) 
       { 
        Title = ((Node) nodeListElementbooktitle.item(0)).getNodeValue(); 
        Log.d("MainActivity", "Title:"+Title); 
        tv_title.setText(Title); 
       } 
      } 

      NodeList nodeListbookBanner = doc.getDocumentElement().getElementsByTagName("logo"); 
      if(nodeListbookBanner.getLength()>0){ 
       Element elementTeamBanner = (Element) nodeListbookBanner.item(0); 
       NodeList nodeListElementTeamBanner = elementTeamBanner.getChildNodes(); 
       if(nodeListElementTeamBanner.getLength()>0) 
       { 
        bookImageUrl = ((Node) nodeListElementTeamBanner.item(0)).getNodeValue(); 
        try { 
         DownloadFilesTask d = new DownloadFilesTask(); 
         d.execute(new URL(bookImageUrl)); 
         d.sendObjectImageView(iv_logo); 
        } catch (Exception e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
         Log.d("ERROR getView", "EX::"+e); 
        } 

        Log.d("MainActivity", "bookImageUrl:"+bookImageUrl); 
        Log.d("MainActivity", ""); 
       } 
      } 
      NodeList nodeListbook = doc.getDocumentElement().getElementsByTagName("Book"); 
      Log.d("MainActivity","nodeListbook Length--"+nodeListbook.getLength()); 
      nodeListbooksLength=nodeListbook.getLength(); 

      booksImagesList = new Drawable[nodeListbooksLength+1]; 

      if(nodeListbooksLength>0){ 
       for(int v=0;v<nodeListbooksLength;v++){ 
        Node nodebook = nodeListbook.item(v); 

        if (nodebook.getNodeType() == Node.ELEMENT_NODE){ 
         Element elementbookResult = (Element) nodebook; 
         bookId=elementbookResult.getAttribute("bid"); 
         Log.d("MainActivity","----in bookId- ->"+v+" "+bookId); 

         bookImageUrl=elementbookResult.getAttribute("bimg"); 
         Log.d("MainActivity","--bookImageUrl--->"+bookImageUrl); 
         bookTitle=elementbookResult.getAttribute("bte"); 
         Log.d("MainActivity","--bookTitle--->"+bookTitle); 
         bookDescription=elementbookResult.getAttribute("bsd"); 
         Log.d("MainActivity","--bookDescription--->"+bookDescription); 
         bookUrl=elementbookResult.getAttribute("bph"); 
         Log.d("MainActivity","--bookUrl:--->"+bookUrl); 
         list.add(new Book(bookId, bookImageUrl,bookTitle,bookDescription,bookUrl)); 
        } 
       } 
      } 


     } 
    }catch(Exception e){ 
     Log.d("MainActivity", "parseXML:"+e); 
    } 
} 
private InputStream openHttpConnection(String urlStr) { 
    InputStream in = null; 
    int resCode = -1; 

    try { 
     Log.d("openHttpConnection", "URL:"+urlStr); 
     URL url = new URL(urlStr); 
     URLConnection urlConn = url.openConnection(); 

     if (!(urlConn instanceof HttpURLConnection)) { 
      throw new IOException ("URL is not an Http URL"); 
     } 
     Log.d("openHttpConnection", "httpConn:1"); 
     HttpURLConnection httpConn = (HttpURLConnection)urlConn; 
     httpConn.setAllowUserInteraction(false); 
     httpConn.setInstanceFollowRedirects(true); 
     httpConn.setRequestMethod("GET"); 
     httpConn.setRequestProperty("User-Agent", "Mozilla/5.0 (X11; U; Linux "+"i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)"); 
     httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
     Log.d("openHttpConnection", "setting requests and properties"); 
     httpConn.connect(); 
     Log.d("openHttpConnection", "Connected successfully"); 

     resCode = httpConn.getResponseCode();  

     Log.d("openHttpConnection", "resCode"+resCode); 
     if (resCode == HttpURLConnection.HTTP_OK) { 
      in = httpConn.getInputStream(); 
      Log.d("openHttpConnection", "Fetchinf data done"); 
     }   
    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
     Log.d("openHttpConnection", "1"+e); 
    } catch (IOException e) { 
     e.printStackTrace(); 
     Log.d("openHttpConnection", ""+e); 
    } 
    return in; 
} 

private HttpClient httpClient; 
private HttpPost httpPost; 
private HttpResponse response; 
private HttpContext localContext; 
private String ret; 

private InputStream postPage(String url, String data) { 
    InputStream is = null; 
    ret = null; 

    httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.RFC_2109); 

    httpPost = new HttpPost(url); 
    response = null; 

    StringEntity tmp = null;   

    httpPost.setHeader("User-Agent", "Mozilla/5.0 (X11; U; Linux " + 
     "i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)"); 
    httpPost.setHeader("Accept", "text/html,application/xml," + 
     "application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"); 
    httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded"); 

    try { 
     tmp = new StringEntity(data,"UTF-8"); 
    } catch (UnsupportedEncodingException e) { 
     System.out.println("HTTPHelp : UnsupportedEncodingException : "+e); 
    } 

    httpPost.setEntity(tmp); 

    try { 
     response = httpClient.execute(httpPost,localContext); 
    } catch (ClientProtocolException e) { 
     System.out.println("HTTPHelp : ClientProtocolException : "+e); 
    } catch (IOException e) { 
     System.out.println("HTTPHelp : IOException : "+e); 
    } 
      ret = response.getStatusLine().toString(); 
      HttpEntity he = response.getEntity(); 
      try { 
       InputStream inStream = he.getContent(); 
       is = inStream; 
      } catch (IllegalStateException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      return is; 
    } 

class Book 
{ 
    public String getBookId() { 
     return bookId; 
    } 
    public String getBookImageUrl() { 
     return bookImageUrl; 
    } 
    public String getBookTitle() { 
     return bookTitle; 
    } 
    public String getBookDescription() { 
     return bookDescription; 
    } 
    public String getBookUrl() { 
     return bookUrl; 
    } 
    private String bookId; 
    private String bookImageUrl; 
    private String bookTitle; 
    private String bookDescription; 
    private String bookUrl; 
    public Book(String bookId, String bookImageUrl, String bookTitle,String bookDescription, String bookUrl) { 
     this.bookId = bookId; 
     this.bookImageUrl = bookImageUrl; 
     this.bookTitle = bookTitle; 
     this.bookDescription = bookDescription; 
     this.bookUrl = bookUrl; 
    } 


} 

public class ButtonListMenuAdapter extends BaseAdapter { 

    public static final String LOG_TAG = "ButtonListAdapter"; 

    private Context context; 
    private List<Book> menuList; 
    private int rowResID; 



    public ButtonListMenuAdapter(MainActivity context, int rowResID, 
      ArrayList<Book> menuList) { 
     // TODO Auto-generated constructor stub 
     this.context = context; 
     this.rowResID = rowResID; 
     this.menuList = menuList; 
    } 

    public int getCount() {       
     return menuList.size(); 
    } 

    public Object getItem(int position) {  
     return menuList.get(position); 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(final int position, View convertView, ViewGroup parent) { 
     final Book row = menuList.get(position); 
     LayoutInflater inflater = LayoutInflater.from(context); 
     View v = inflater.inflate( rowResID, parent, false); 
     TextView tv_title = (TextView)v.findViewById(R.id.Text_book_title); 
     tv_title.setText(row.getBookTitle()); 
     TextView tv_desc = (TextView)v.findViewById(R.id.Text_Book_Desc); 
     tv_desc.setText(row.getBookDescription()); 
     ImageView iv_book_img = (ImageView)v.findViewById(R.id.Image_book); 
     if(booksImagesList[position]==null) 
     { 
      try { 
       DownloadFilesTask d = new DownloadFilesTask(); 
       d.execute(new URL(row.getBookImageUrl())); 
       d.sendObjectImageView(iv_book_img,position); 
      } catch (Exception e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
       Log.d("ERROR getView", "EX::"+e); 
      } 
     } 
     else 
     { 
      iv_book_img.setImageDrawable(booksImagesList[position]); 
      Log.d("Not","Reloaded"); 
     } 

     Button b_get_book = (Button)v.findViewById(R.id.Button01); 
     b_get_book.setOnClickListener(
       new View.OnClickListener() 
       {    
        public void onClick(View v) { 




           private final String PATH = "/mnt/sdcard/"; //put the downloaded file here 





           public void DownloadFromUrl(String bookUrl, String fileName) { //this is the downloader method 

             try { 

               URL url = new URL("http://mysite.com/" + bookUrl); //you can write here any link 

               File file = new File(fileName); 



               long startTime = System.currentTimeMillis(); 

               Log.d("ImageManager", "download begining"); 

               Log.d("ImageManager", "download url:" + url); 

               Log.d("ImageManager", "downloaded file name:" + fileName); 

               /* Open a connection to that URL. */ 

               URLConnection ucon = url.openConnection(); 



               /* 

               * Define InputStreams to read from the URLConnection. 

               */ 

               InputStream is = ucon.getInputStream(); 

               BufferedInputStream bis = new BufferedInputStream(is); 



               /* 

               * Read bytes to the Buffer until there is nothing more to read(-1). 

               */ 

               ByteArrayBuffer baf = new ByteArrayBuffer(50); 

               int current = 0; 

               while ((current = bis.read()) != -1) { 

                 baf.append((byte) current); 

               } 



               /* Convert the Bytes read to a String. */ 

               FileOutputStream fos = new FileOutputStream(PATH+file); 

               fos.write(baf.toByteArray()); 

               fos.close(); 

               Log.d("ImageManager", "download ready in" 

                   + ((System.currentTimeMillis() - startTime)/1000) 

                   + " sec"); 



             } catch (IOException e) { 

               Log.d("ImageManager", "Error: " + e); 

             } 



           } 


        } 
      }); 
     return v; 
    } 
} 

private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> { 
    ImageView iv; 
    int id; 
    protected Long doInBackground(URL... urls) { 
     int count = urls.length; 
     long totalSize = 0; 

     downloadDrawable(urls[0].toString()); 

     return totalSize; 
    } 

    public void sendObjectImageView(ImageView ivLogo) { 
     // TODO Auto-generated method stub 
     this.iv = ivLogo; 
     id = -1; 
    } 

    public void sendObjectImageView(ImageView iv,int id) { 
     // TODO Auto-generated method stub 
     this.iv = iv; 
     this.id = id; 
    } 

    protected void onProgressUpdate(Integer... progress) { 
     Log.d("DownloadFilesTask", "onProgressUpdate"+progress[0]); 
    } 
    protected void onPostExecute(Long result) { 
     Log.d("DownloadFilesTask", "onPostExecute"+result); 
     if(d!=null && iv!=null) 
     { 
      iv.setImageDrawable(d); 
      if(id!=-1) 
      booksImagesList[id] = d; 
     } 
    } 

    private Drawable d; 
    public Drawable downloadDrawable(String imageUrl) { 


     try { 
      Log.d("downloadDrawable", "Starting Connection"); 
      URL url = new URL(imageUrl); 
      URLConnection conn = url.openConnection(); 
      conn.connect(); 
      Log.d("downloadDrawable", "Connection Created Successfully"); 
      InputStream is = conn.getInputStream(); 
      Log.d("downloadDrawable", "InputStream created Successfully"); 
      d = Drawable.createFromStream(is, url.toString()); 
      Log.d("downloadDrawable", "Drawable created Successfully"); 
      is.close(); 

     } catch (IOException e) { 
      Log.d("ERROR3", "Ex::"+e); 

     } 

     return d; 
    } 

} 

}

Answer 1

這是一個典型的HTTP連接。

URL url = new URL(strUrl); 
    HttpURLConnection urlConn = (HttpURLConnection) url 
      .openConnection(); 

    InputStream is = urlConn.getInputStream(); 

    final int MAX_LENGTH = 10000; 
    byte[] buf = new byte[MAX_LENGTH]; 
    int total = 0; 
    while (total < MAX_LENGTH) { 
     int count = is.read(buf, total, MAX_LENGTH - total); 
     if (count < 0) { 
      break; 
     } 
     total += count; 
    } 
    is.close(); 
    String result = new String(buf, 0, total); 

    urlConn.disconnect();