閱讀和解析文本文件android

Question

最近，我遇到了一個有趣的挑戰，我顯然無法解決。

我是一個android初學者，我感興趣的是：如何從文本文件（在手機上，作爲用戶）讀取並將解析的文件存儲到字符串中，處理字符串，輸出結果呢？

例如：

code to read a file 
. 
. 
code to count characters 
. 
. 
. 
code to print the result on the phone screen. 

感謝您的幫助，我很感激。

Answer 1

背景異步任務加載和分析filename.csv

class LoadAllIcosSD extends AsyncTask<String, String, String> { 

    /** 
    * Before starting background thread Show Progress Dialog 
    * */ 
    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(SynchroIcoActivitySD.this); 
     pDialog.setMessage(getString(R.string.progdata)); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(false); 
     pDialog.show(); 
    } 


    protected String doInBackground(String... args) { 

     try { 

      String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath(); 
      String fileName = "/myfolder/filename.csv"; 
      File myFile = new File(baseDir + File.separator + fileName); 

      if(myFile.exists()){ 
      FileInputStream fIn = new FileInputStream(myFile); 
      BufferedReader myReader = new BufferedReader(
        new InputStreamReader(fIn)); 
      String aDataRow = ""; 
      String aBuffer = ""; 
      //how many row 
      int ip=0; 

      while ((aDataRow = myReader.readLine()) != null) { 
       aBuffer += aDataRow + "\n"; 
       ip = ip+1; 

      } 

      String kosikx = aBuffer; 
      myReader.close(); 

      String delims = "[\n]+"; 
      String delims2 = "[;]+"; 

      String[] riadokxxx = kosikx.split(delims); 

      for (int i = 0; i < riadokxxx.length; i++) { 
      String riadok1 = riadokxxx[i]; 

      String[] polozkyx = riadok1.split(delims2); 
      String icox = polozkyx[0]; 
      String naix = polozkyx[3] + " " + polozkyx[6]; 

      // creating new HashMap 
      HashMap<String, String> map = new HashMap<String, String>(); 

      // adding each child node to HashMap key => value 
      map.put(TAG_PID, icox); 
      map.put(TAG_NAME, naix); 
      map.put(TAG_PRICE, "!!"); 

      // adding HashList to ArrayList 
      productsList.add(map); 
       } 
      }//iffileexist 



     } catch (Exception e) { 

     } 


     return null; 
    } 

    /** 
    * After completing background task Dismiss the progress dialog 
    * **/ 
    protected void onPostExecute(String file_url) { 
     // dismiss the dialog after getting all products 
     pDialog.dismiss(); 
     // updating UI from Background Thread 
     runOnUiThread(new Runnable() { 
      public void run() { 
       /** 
       * Updating parsed JSON data into ListView 
       * */ 
       ListAdapter adapter = new SimpleAdapter(
         SynchroIcoActivitySD.this, productsList, 
         R.layout.list_item_icosd, new String[] { TAG_PID, TAG_NAME, TAG_PRICE}, 
         new int[] { R.id.pid, R.id.name, R.id.price }); 
       // updating listview 
       setListAdapter(adapter); 
      } 
     }); 

    } 

}