如何讀取SD卡中的CSV文件或指定路徑的Android

Question

可能重複：
reading a specific file from sdcard in android

我試圖做一個簡單的Android應用程序，基本上導入一個CSV並將其插入到我的數據庫表中。到目前爲止，我能夠讀取res文件夾中的csv文件。

我的示例csv文件名爲「test.csv」，基本上通過「InputStream is = this.getResources（）。openRawResource（R.drawable.test）;」來訪問。

這裏是我的示例代碼：

InputStream is = this.getResources().openRawResource 
      (R.drawable.test); 
       BufferedReader reader = new BufferedReader(new InputStreamReader 
      (is)); 
       try { 
        String line; 
        String brand = ""; 
        String model = ""; 
        String type = ""; 

        this.dh = new DataHelper(this); 
        //this.dh.deleteAllCar(); 
        while ((line = reader.readLine()) != null) { 
         // do something with "line" 

         String[] RowData = line.split(","); 
         brand = RowData[1]; 
         model = RowData[2]; 
         type = RowData[3]; 
         this.dh = new DataHelper(this); 
         //this.dh.deleteAllCar(); 
         this.dh.insertcsv(brand, model, type); 
        } 
       }catch (IOException ex) { 
        // handle exception 
       }finally { 
        try { 
         is.close(); 
        } 
        catch (IOException e) { 
         // handle exception 
        } 
       } 

這工作正常不過，我希望能夠做出特色，其中用戶可以指定在哪裏得到的文件（從手機的SD卡，等等等等）。但現在，我想知道如何從sdcard（mnt/sdcard/test.csv）訪問csv。

幫助將不勝感激！感謝和愉快的編碼！

Answer 1

讀取從SD卡文件已經覆蓋上先前堆棧溢出。

這裏的鏈接：

• reading a specific file from sdcard in android

Answer 2

這裏是如何寫到SD卡的代碼，你應該能夠使用上面的代碼，以找出讀取部分：

private void writeToSDCard() { 
try { 
    File root = Environment.getExternalStorageDirectory(); 

    if (root.canWrite()){ 
     InputStream from = myContext.getResources().openRawResource(rID); 
     File dir = new java.io.File (root, "pdf"); 
     dir.mkdir(); 
     File writeTo = new File(root, "pdf/" + attachmentName); 
     FileOutputStream to = new FileOutputStream(writeTo); 

     byte[] buffer = new byte[4096]; 
     int bytesRead; 

     while ((bytesRead = from.read(buffer)) != -1) 
      to.write(buffer, 0, bytesRead); // write 
     to.close();    
     from.close(); 
    } else { 
     Log.d(TAG, "Unable to access SD card."); 
    } 
} catch (Exception e) { 
    Log.d(TAG, "writeToSDCard: " + e.getMessage()); 
} 
}  
}