ListView中的更新按鈕狀態加載

Question

我在寫一個應用程序，其中顯示了列表視圖項的狀態，在這裏：我顯示SD卡圖像，並允許用戶單擊上傳按鈕將圖像上載到服務器，並顯示結果以及，如：如果上傳完成到服務器，然後顯示上傳完成，如果用戶已經上傳到服務器，然後顯示已上傳，但每當用戶點擊上傳按鈕，但現在我想顯示圖像的狀態，無論何時列出負載，請參見下面的屏幕截圖：

UploadActivity.java：

@Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_uploads); 

     // Permission StrictMode 
     if (android.os.Build.VERSION.SDK_INT > 9) 
     { 
      StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
      StrictMode.setThreadPolicy(policy); 
     }   

     // click to create new event 
     btn_previous_activity = (Button) findViewById(R.id.btn_previous_activity); 
     btn_previous_activity.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       // using Intent to call EventListActivity    
       Intent intentNewEvent = new Intent(UploadActivity.this, EventListActivity.class); 
       startActivity(intentNewEvent); 
      } 
     }); 

     /*** Get Images from SDCard ***/ 
     ImageList = getSD(); 
     Log.d(UploadActivity.LOG_TAG, "getSD() :::--- " + ImageList); 

     // ListView and imageAdapter 
     lstView = (ListView) findViewById(R.id.listView1); 
     lstView.setAdapter(new ImageAdapter(this)); 

    } 


    private List <String> getSD() 
    { 
     List <String> it = new ArrayList <String>(); 

     String string = "/mnt/sdcard/Pictures/MyNewImages/"; 
     File f = new File (string+ SingleAngelActivity.customFolder+ "/"); 

     Log.d(UploadActivity.LOG_TAG, "KEY_TITLE :::--- " + f); 
     File[] files = f.listFiles(); 
     Log.d(UploadActivity.LOG_TAG, "getListImages() :::--- " + files); 

     for (int i = 0; i <files.length; i++)   
     { 
      File file = files[i]; 
      Log.d(UploadActivity.LOG_TAG, "i<files.length() :::--- " + i); 
      Log.d("Count",file.getPath()); 
      it.add (file.getPath()); 
     } 
     Log.d(UploadActivity.LOG_TAG, "List <String> it :::--- " + it); 
     return it; 
    } 

//Upload 
    public void startUpload(final int position) {  
     Runnable runnable = new Runnable() { 

      public void run() { 
       handler.post(new Runnable() { 
        public void run() { 
         View v = lstView.getChildAt(position - lstView.getFirstVisiblePosition()); 
         // Show ProgressBar 
         ProgressBar progress = (ProgressBar)v.findViewById(R.id.progressBar); 
         progress.setVisibility(View.VISIBLE); 

         // Status 
         TextView status = (TextView)v.findViewById(R.id.ColStatus); 
         status.setText("Uploading.."); 

         new UploadFileAsync().execute(String.valueOf(position)); 
        } 
       }); 
      } 
     }; 
     new Thread(runnable).start(); 
    } 


    // Async Upload 
    public class UploadFileAsync extends AsyncTask<String, Void, Void> { 

     String resServer; 
     int position; 

     protected void onPreExecute() { 
      super.onPreExecute(); 
     } 

     @Override 
     protected Void doInBackground(String... params) { 
      // TODO Auto-generated method stub 
      position = Integer.parseInt(params[0]); 

      int bytesRead, bytesAvailable, bufferSize; 
      byte[] buffer; 
      int maxBufferSize = 1 * 1024 * 1024; 
      int resCode = 0; 
      String resMessage = ""; 

      String lineEnd = "\r\n"; 
      String twoHyphens = "--"; 
      String boundary = "*****"; 

      // File Path 
      String strSDPath = ImageList.get(position).toString(); 

      // Upload to PHP Script 
      String strUrlServer = "http://10.0.2.2/res/files.php";    

      try { 
       /** Check file on SD Card ***/ 
       File file = new File(strSDPath); 
       if(!file.exists()) 
       { 
        resServer = "{\"StatusID\":\"0\",\"Error\":\"Please check path on SD Card\"}"; 
        return null; 
       } 

       FileInputStream fileInputStream = new FileInputStream(new File(strSDPath)); 

       URL url = new URL(strUrlServer); 
       HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
       conn.setDoInput(true); 
       conn.setDoOutput(true); 
       conn.setUseCaches(false); 
       conn.setRequestMethod("POST"); 

       conn.setRequestProperty("Connection", "Keep-Alive"); 
       conn.setRequestProperty("Content-Type", 
         "multipart/form-data;boundary=" + boundary); 

       DataOutputStream outputStream = new DataOutputStream(conn 
         .getOutputStream()); 
       outputStream.writeBytes(twoHyphens + boundary + lineEnd); 
       outputStream 
       .writeBytes("Content-Disposition: form-data; name=\"filUpload\";filename=\"" 
         + strSDPath + "\"" + lineEnd); 
       outputStream.writeBytes(lineEnd); 

       bytesAvailable = fileInputStream.available(); 
       bufferSize = Math.min(bytesAvailable, maxBufferSize); 
       buffer = new byte[bufferSize]; 

       // Read file 
       bytesRead = fileInputStream.read(buffer, 0, bufferSize); 

       while (bytesRead > 0) { 
        outputStream.write(buffer, 0, bufferSize); 
        bytesAvailable = fileInputStream.available(); 
        bufferSize = Math.min(bytesAvailable, maxBufferSize); 
        bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
       } 

       outputStream.writeBytes(lineEnd); 
       outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 

       // Response Code and Message 
       resCode = conn.getResponseCode(); 
       if(resCode == HttpURLConnection.HTTP_OK) 
       { 
        InputStream is = conn.getInputStream(); 
        ByteArrayOutputStream bos = new ByteArrayOutputStream(); 

        int read = 0; 
        while ((read = is.read()) != -1) { 
         bos.write(read); 
        } 
        byte[] result = bos.toByteArray(); 
        bos.close(); 

        resMessage = new String(result); 
       } 

       Log.d("resCode=",Integer.toString(resCode)); 
       Log.d("resMessage=",resMessage.toString()); 

       fileInputStream.close(); 
       outputStream.flush(); 
       outputStream.close(); 

       resServer = resMessage.toString(); 

      } catch (Exception ex) { 
       // Exception handling 
       return null; 
      } 
      return null; 
     } 

     protected void onPostExecute(Void unused) { 
      statusWhenFinish(position,resServer); 
     }  
    } 

    // when upload finish 
    protected void statusWhenFinish(int position, String resServer) { 

     View v = lstView.getChildAt(position - lstView.getFirstVisiblePosition()); 

     // Show ProgressBar 
     ProgressBar progress = (ProgressBar)v.findViewById(R.id.progressBar); 
     progress.setVisibility(View.GONE); 


     // Status 
     TextView status = (TextView)v.findViewById(R.id.ColStatus); 
     /*** Default Value ***/ 
     String strStatusID = "0"; 
     String strMessage = "File Exists!"; 

     try {  

      JSONObject c = new JSONObject(resServer); 
      strStatusID = c.getString("StatusID"); 
      strMessage = c.getString("Message"); 
     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     // Prepare Status  
     if(strStatusID.equals("0")) 
     {    
      status.setText(strMessage); 
      status.setTextColor(Color.RED); 

      // Enabled Button again 
      Button btnUpload = (Button) v.findViewById(R.id.btnUpload); 
      btnUpload.setText("Already Uploaded"); 
      btnUpload.setTextColor(Color.RED); 
      btnUpload.setEnabled(true); 
     } 
     else 
     { 
      status.setText("Upload Completed."); 
      status.setTextColor(Color.GREEN); 
     } 
    } 

Answer 1

在適配器中添加新值並調用notifyDataSetChanged。

按照步驟更新列表視圖。

1) First Add new values to your CountriesList . 
2) Before Assign EfficientAdapter to listiew, make one object of it and then assign that object. 
3) Create one function in your EfficientAdapter class called notifyDataSetChanged(). 
4) Call notifyDataSetChanged() function using EfficientAdapter object. 

例

EfficientAdapter objectAdapter = new EfficientAdapter(this); 
listView.setAdapter(objectAdapter); 

@Override 
public void notifyDataSetChanged() // Create this function in your adapter class 
{ 
    super.notifyDataSetChanged(); 
} 

現就刷新按鈕的onClick事件調用objectAdapter.notifyDataSetChanged（）。