下載圖片覆蓋前一個

void downloadFile(){ 



    try { 
     Bundle bundle = getIntent().getExtras(); 
     String[] imageUrls = bundle.getStringArray(Extra.IMAGES); 
     // Log.v(imageUrls, "Creating view..."); 
     int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0); 

     URL url = new URL(imageUrls[pagerPosition]); 
     HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); 

     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 

     //connect 
     urlConnection.connect(); 

     //set the path where we want to save the file 
     File SDCardRoot = Environment.getExternalStorageDirectory(); 
     //create a new file, to save the downloaded file 
     File file = new File(SDCardRoot,"image.png"); 

     FileOutputStream fileOutput = new FileOutputStream(file); 

     //Stream used for reading the data from the internet 
     InputStream inputStream = urlConnection.getInputStream(); 

     //this is the total size of the file which we are downloading 
     totalSize = urlConnection.getContentLength(); 

     runOnUiThread(new Runnable() { 
      public void run() { 
       pb.setMax(totalSize); 
      } 
     }); 

     //create a buffer... 
     byte[] buffer = new byte[1024]; 
     int bufferLength = 0; 

     while ((bufferLength = inputStream.read(buffer)) > 0) { 
      fileOutput.write(buffer, 0, bufferLength); 
      downloadedSize += bufferLength; 
      // update the progressbar // 
      runOnUiThread(new Runnable() { 
       public void run() { 
        pb.setProgress(downloadedSize); 
        float per = ((float)downloadedSize/totalSize) * 100; 
        cur_val.setText("Downloaded " + downloadedSize + "KB/" + totalSize + "KB (" + (int)per + "%)"); 
       } 
      }); 
     } 
     //close the output stream when complete // 
     fileOutput.close(); 
     runOnUiThread(new Runnable() { 
      public void run() { 
       // pb.dismiss(); // if you want close it.. 
      } 
     }); 

    } catch (final MalformedURLException e) { 
     showError("Error : MalformedURLException " + e); 
     e.printStackTrace(); 
    } catch (final IOException e) { 
     showError("Error : IOException " + e); 
     e.printStackTrace(); 
    } 
    catch (final Exception e) { 
     showError("Error : Please check your internet connection " + e); 
    } 
}

嗨，我使用這個功能從URL下載圖像工作正常。但它會覆蓋先前下載的圖像..下載圖片覆蓋前一個

File file = new File(SDCardRoot,"image.png");

如何更改名字在上面行每一個新的下載..它不接受任何東西是不是字符串。

任何幫助將是偉大的。

來源

2014-06-12 diwa

它，因爲你總是保存同名image.png圖像，使用當前日期時間作爲更改名稱，以便改變這種

File file = new File(SDCardRoot,"image.png");

到

SimpleDateFormat formatter = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss"); 
Date now = new Date(); 
String fileName = "image" + formatter.format(now) + ".png"; 
File file = new File(SDCardRoot,fileName);

編輯
您也可以使用Calendar作爲

Calendar calendar = Calendar.getInstance(); 
SimpleDateFormat formatter = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss"); 
String fileName = "image" + formatter.format(calendar.getTime()) + ".png"; 
File file = new File(SDCardRoot,fileName);

來源

2014-06-12 08:43:21

雅感謝ü...這真是棒極了... – diwa

@ user3652550很高興能幫助你。如果此答案或任何其他人解決了您的問題，請將其標記爲已接受，因此可能也會幫助其他人 –

亞我試過了...它要求我等5分鐘才能接受... – diwa

您可以通過此給：

Calender calendar=Calender.getInstance(); 
String fileName = "image_" + calendar.getTimeInMillis() + ".png"; 
File file = new File(SDCardRoot,fileName);

來源

2014-06-12 08:48:57 Kishan

下載圖片覆蓋前一個

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