onFileChange（DbxFile文件）多次調用（exaclty 8倍）時，文件更改

Question

我使用下拉框同步API的Android平臺，下面的場景是發生：

1. 用戶A已經打開某些文件（說A.xls）。
2. 雖然userA的文件仍處於打開狀態，但userB對同一文件進行了一些更改並將文件推送到Dropbox上。
3. 現在userA獲得onFileChange（DbxFile文件）的回調。每次更新時，此方法每次只准確調用8次。

我需要確認的是多個回調更新是SyncAPI的一個功能。

如果它是一個功能，有沒有什麼辦法可以禁用它，以獲得每次更新只有1個回調。

如果它不是一個功能，你能建議任何可能性爲什麼發生這種情況。

從我身邊，我檢查了監聽器只註冊一次，實現監聽器的類是單例。

我希望以下代碼和日誌可能會爲您提供更多信息。

@Override 
    public void onFileChange(DbxFile oldFile) { 
     try { 
      Log.d(tag, "onFileChange count = " + count); 

      if (count % 8 == 0) { 
       Date oldFileDate = oldFile.getInfo().modifiedTime; 
       Log.d(tag, "current file modification time = " + oldFileDate + "\t file status = " + getStatus(oldFile)); 
       DbxPath mpath = oldFile.getPath(); 
       Log.d(tag, "Kicking thread"); 
       Runnable newFileStatusCheckRunnable = new CheckNewFileUpdateTask(context.getDbxFs(), mpath, oldFile); 
       Thread newFileStatusCheckThread = new Thread(newFileStatusCheckRunnable); 
       newFileStatusCheckThread.start(); 
      } 
      Log.d(tag, "Incrmenting counter"); 
      count++; 

     } catch (DbxException e) { 

      e.printStackTrace(); 
     } 
    } 

日誌（僅日誌的相關部分加入）

01-11 18:22:12.515: D/FileChangeListener(6127): onFileChange count = 0 
01-11 18:22:12.515: D/FileChangeListener(6127): current file modification time = Sat Jan 11 17:43:17 GMT+05:30 2014 file status = isLatestDOWNLOAD 
01-11 18:22:12.515: D/FileChangeListener(6127): Kicking thread 
01-11 18:22:12.525: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:12.525: D/FileChangeListener(6127): trying first time 
01-11 18:22:12.525: D/FileChangeListener(6127): checking, if downloding then wait 
01-11 18:22:14.908: D/FileChangeListener(6127): onFileChange count = 1 
01-11 18:22:14.908: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:14.908: D/FileChangeListener(6127): onFileChange count = 2 
01-11 18:22:14.908: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:15.308: D/FileChangeListener(6127): onFileChange count = 3 
01-11 18:22:15.308: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:15.308: D/FileChangeListener(6127): onFileChange count = 4 
01-11 18:22:15.308: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:15.688: D/FileChangeListener(6127): onFileChange count = 5 
01-11 18:22:15.688: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:15.688: D/FileChangeListener(6127): onFileChange count = 6 
01-11 18:22:15.688: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:15.719: D/FileChangeListener(6127): onFileChange count = 7 
01-11 18:22:15.719: D/FileChangeListener(6127): Incrmenting counter 
01-11 18:22:15.719: D/FileChangeListener(6127): wait over 
01-11 18:22:15.719: E/libDropboxSync.so(ERR)(6127): DROPBOX_ERROR_ALREADYOPEN: file.cpp:246: p(/p3.xls) already open (0) 
01-11 18:22:15.729: D/FileChangeListener(6127): closing file 
01-11 18:22:15.729: D/FileChangeListener(6127): Re-trying to open 
01-11 18:22:15.759: D/FileChangeListener(6127): New file time: Sat Jan 11 18:23:08 GMT+05:30 2014 
01-11 18:22:15.759: D/gaurav(6127): UtilityBillAppActivity onNotice 

Answer 1

我需要檢查文件是否已經下載並在系統緩存，緩存完成之前，我需要忽略所有回調。

@Override 
public void onFileChange(DbxFile oldFile) { 
    Log.d(tag, "onFileChange"); 

    try { 
     if (false == oldFile.getSyncStatus().isLatest) { 
      if (oldFile.getNewerStatus().isCached) { 
       Log.d(tag, "file downloaded, and is ready to use, status=" + getStatus(oldFile)); 
       boolean isFileUpdated = oldFile.update(); 
       if (isFileUpdated) { 
        Log.d(tag, "New file updated successfully"); 
        DbXFileHolder.getInstance().setDropBoxFile(oldFile); 
        context.setFilePath(oldFile.getPath()); 
        Intent foundNewFileIntent = new Intent(CommonUtil.ACTION); 
        LocalBroadcastManager.getInstance(context).sendBroadcast(foundNewFileIntent); 
       }else{ 
        Log.d(tag, "New file could not update successfully"); 
       } 
      } else { 
       Log.d(tag, "file downloading, byte transferred = " + oldFile.getNewerStatus().bytesTransferred + "\tstatus = " + getStatus(oldFile)); 
      } 
     } else { 
      Log.d(tag, "Sync status is latest. status = " + getSyncStatus(oldFile)); 
     } 

    } catch (DbxException e) { 
     for (StackTraceElement ste : e.getStackTrace()) { 
      Log.d(tag, ste.toString()); 
     } 
    } 

} 


private String getStatus(DbxFile newFile) { 
    StringBuilder statusBuilder = new StringBuilder(); 
    try { 
     DbxFileStatus fStatus = newFile.getNewerStatus(); 
     if (fStatus.isCached) { 
      statusBuilder.append("isCached"); 
     } 
     if (fStatus.isLatest) { 
      statusBuilder.append("isLatest"); 
     } 
     if (fStatus.failure != null) { 
      statusBuilder.append("failure"); 

     } 
     if (PendingOperation.DOWNLOAD.equals(fStatus.pending)) { 
      statusBuilder.append("DOWNLOAD"); 

     } 
     if (PendingOperation.UPLOAD.equals(fStatus.pending)) { 
      statusBuilder.append("UPLOAD"); 

     } 
     if (PendingOperation.NONE.equals(fStatus.pending)) { 
      statusBuilder.append("NONE"); 
     } 
    } catch (DbxException e) { 
     statusBuilder.append("Exception: " + e.getMessage()); 
    } 
    return statusBuilder.toString(); 
} 

private String getSyncStatus(DbxFile newFile) { 
    StringBuilder statusBuilder = new StringBuilder(); 
    try { 
     DbxFileStatus fStatus = newFile.getSyncStatus(); 
     if (fStatus.isCached) { 
      statusBuilder.append("isCached"); 
     } 
     if (fStatus.isLatest) { 
      statusBuilder.append("isLatest"); 
     } 
     if (fStatus.failure != null) { 
      statusBuilder.append("failure"); 

     } 
     if (PendingOperation.DOWNLOAD.equals(fStatus.pending)) { 
      statusBuilder.append("DOWNLOAD"); 

     } 
     if (PendingOperation.UPLOAD.equals(fStatus.pending)) { 
      statusBuilder.append("UPLOAD"); 

     } 
     if (PendingOperation.NONE.equals(fStatus.pending)) { 
      statusBuilder.append("NONE"); 
     } 
    } catch (DbxException e) { 
     statusBuilder.append("Exception: " + e.getMessage()); 
    } 
    return statusBuilder.toString(); 
}