從Android中的鏈接下載PDF

Question

我需要從Android下面的URL下載PDF。任何想法如何可以做到這一點：

http://bkinfo.in/Murli/1305/EME-26-05-2013.pdf

同樣，還有一個MP3： http://bkinfo.in/Murli/1305/26-05-2013.mp3

欣賞的想法..

最後.... 以下是完整的代碼我用過的。有人可能是有用的.. 添加這些體現：

確保您的AVD可以寫入SD卡（如果你正在寫卡）。 U可以通過將內存塊分配給AVD Manager中的SDCard進行設置。

public class MainActivity extends Activity { 
      static ProgressDialog pd; 
      protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
        pd = new ProgressDialog(this); 
        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
        pd.setCancelable(false); 
        AsyncTaskTest at = new AsyncTaskTest(); 
        at.execute(); 
      } 

      public class AsyncTaskTest extends AsyncTask<Void, Integer, Integer> { 
        Session s = null; 
        protected void onPreExecute(){ 
          pd.show(); 
        } 

        protected Integer doInBackground(Void... vd){ 
          try{ 
            String[] urls = new String[3]; 
            urls[0] = "http://bkinfo.in/Murli/1305/HMS-25-05-2013.pdf"; 
            urls[1] = "http://bkinfo.in/Murli/1305/EME-25-05-2013.pdf"; 
            urls[2] = "http://bkinfo.in/Murli/1305/25-05-2013.mp3"; 
            String fileName = urls[2].substring(urls[2].lastIndexOf("/")+1); //Coupying the mp3 
            URL url = new URL(urls[2]); 
            URLConnection conection = url.openConnection(); 
            conection.setConnectTimeout(10000); 
            conection.connect(); 
            int lenghtOfFile = conection.getContentLength(); 
            InputStream input = new BufferedInputStream(url.openStream(),8192); 
            OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory()+"/"+fileName); 
            byte data[] = new byte[1024]; 
            long total = 0; 
            while ((count = input.read(data)) != -1){ 
              total += count; 
              output.write(data, 0, count); 
              publishProgress((int) ((total * 100)/lenghtOfFile)); 
            } 
            output.flush(); 
            output.close(); 
            input.close(); 
          }catch(Exception e){ 
            Log.e("MyError:",e.toString()); 
          } 
          return 0; 
        } 

        protected void onProgressUpdate(Integer... msg) { 
          pd.setProgress(msg[0]); 
        } 

        protected void onPostExecute(Integer in){ 
          pd.dismiss(); 
          showDialog("Done !"); 
        } 

        private void showDialog(String msg){ 
        final AlertDialog.Builder alertBox = new AlertDialog.Builder(new ContextThemeWrapper(MainActivity.this, android.R.style.Theme_Dialog)); 
        alertBox.setMessage(msg); 
        alertBox.setCancelable(false) 
            .setPositiveButton("Ok", new DialogInterface.OnClickListener(){ 
            public void onClick(DialogInterface dialog,int id){ 
              dialog.cancel(); 
            } 
          }).show(); 
        } 
      } 
    } 

Answer 1

希望我不是湯匙餵養！我有一些艱難的時間，所以我決定分享我的工作代碼。

private void downloadCommandFile(String dlUrl){ 
    int count; 
    try { 
     URL url = new URL(dlUrl); 
     HttpURLConnection con = (HttpURLConnection) url.openConnection(); 
     con.setDoInput(true); 
     con.setDoOutput(true); 
     con.connect(); 
     int fileSize = con.getContentLength(); 
     Log.d("TAG", "Download file size = " + fileSize); 
     InputStream is = url.openStream(); 
     String dir = Environment.getExternalStorageDirectory() + "dl_directory"; 
     File file = new File(dir); 
     if(!file.exists()){ 
      file.mkdir(); 
     } 

     FileOutputStream fos = new FileOutputStream(file + "EME-26-05-2013.pdf"); 
     byte data[] = new byte[1024]; 

     while((count = is.read(data)) != -1){ 
      fos.write(data, 0, count); 
     } 

     is.close(); 
     fos.close(); 


    } catch (Exception e) { 
     Log.e("TAG", "DOWNLOAD ERROR = " + e.toString()); 
    } 

} 




public class DownloadTask extends AsyncTask<String, Void, String>{ 

    @Override 
    protected String doInBackground(String... params) { 
      String url = "http://bkinfo.in/Murli/1305/EME-26-05-2013.pdf"; // your url here 
     downloadCommandFile(url); 
     return null; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     // download complete 
    } 

} 

呼叫異步任務如下：

new DownloadTask().execute(); 

而且不要忘了添加到您的清單文件：

<uses-permission android:name="android.permission.INTERNET"/>