Android 中怎么利用Http下載文件到手機

Android 中怎么利用Http下載文件到手機，針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。

訪問Internet和保存文件到SDCard上，首先要在mainifest.xml文件中加上下面的權限。

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

gettextfilestring(String url)獲取文本文件內：

public String gettextfilestring(String url){                 InputStream input =getinputStream(url);                 StringBuffer sb = new StringBuffer("");                 BufferedReader bfr = new BufferedReader(new InputStreamReader(input));                 String line = "";                 try {                         while((line=bfr.readLine())!=null){                                 sb.append(line);                         }                                         } catch (IOException e) {                         toasterror("流文件讀寫錯誤");                         e.printStackTrace();                 }finally{                         try {                                 bfr.close();                         } catch (IOException e) {                                 toasterror("流文件未能正常關閉");                                 e.printStackTrace();                         }                 }                 return sb.toString(); }

downFiletoDecive(String url,String filename)方法下載文件到設備內存，下載的文件在應用的路徑file下：

public void downFiletoDecive(String url,String filename){                     if((url!=null&&!"".equals(url))&&(filename!=null&&!"".equals(filename))){                             InputStream input = getinputStream(url);                             FileOutputStream outStream = null;                             try {                                     outStream = c.openFileOutput(filename, Context.MODE_WORLD_READABLE|Context.MODE_WORLD_WRITEABLE);                                     int temp = 0;                                     byte[] data = new byte[1024];                                     while((temp = input.read(data))!=-1){                                             outStream.write(data, 0, temp);                                     }                             } catch (FileNotFoundException e) {                                     toasterror("請傳入正確的上下文");                                     e.printStackTrace();                             } catch (IOException e) {                                     toastemessage("讀寫錯誤");                                     e.printStackTrace();                             }finally{                                     try {                                             outStream.flush();                                             outStream.close();                                     } catch (IOException e) {                                             toasterror("流文件未能正常關閉");                                             e.printStackTrace();                                     }                                                                 }                     }                     toastemessage("下載成功");             }

downFiletoSDCard(String url,String path,String filename)下載文件到SDCard中，自定義保存路：

public void downFiletoSDCard(String url,String path,String filename){                                 if((url!=null&&!"".equals(url))&&(path!=null)&&(filename!=null&&!"".equals(filename))){                                                                 InputStream input = getinputStream(url);                                 downloader(input, path, filename);                                         }else{                                 /*                                  * 對不合發的參數做處理                                  */                                 if(url==null||"".equals(url)){                                         toasterror("url不能為空或為“”");                                 }                                 if(path==null){                                         toasterror("path不能為空");                                 }                                 if(filename==null||"".equals(filename)){                                         toasterror("filename不能為空");                                 }                 }                         }

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