Android Google Drive API上传文件 - 写入内容错误

我试图将某个文件上传到Google云端硬盘。我有这个文件在外部存储。所以，当我得到它，步骤完成它：Android Google Drive API上传文件 - 写入内容错误

在Google云端硬盘上创建空文件。
在设备上找到您的文件。
复制文件内容的缓冲区（以字节为单位）。

我成功地设法创建和定位了文件，但我无法正确编辑它的内容。我不知道为什么 - 回调显示，我编辑文件，通过驱动器是空的。

这是我上传的文件代码：

public class UploadFileActivity extends BaseActivity { 

    private final static String TAG = "UploadFileActivity"; 

    @Override 
    public void onConnected(Bundle connectionHint) { 
     super.onConnected(connectionHint); 


     // create new contents resource. 
     Drive.DriveApi.newDriveContents(getGoogleApiClient()).setResultCallback(driveContentsCallback); 
    } 

    final private ResultCallback<DriveApi.DriveContentsResult> driveContentsCallback = 
      new ResultCallback<DriveApi.DriveContentsResult>() { 
       @Override 
       public void onResult(DriveApi.DriveContentsResult result) { 
        if (!result.getStatus().isSuccess()) { 
         //if failure 
         showMessage("Error while trying to create new file contents"); 
         return; 
        } 

        MetadataChangeSet changeSet = new MetadataChangeSet.Builder() 
          .setTitle("editor_backup.xml") 
          .setMimeType("text/xml") 
          .setStarred(true).build(); 


        Drive.DriveApi.getRootFolder(getGoogleApiClient()) 
          .createFile(getGoogleApiClient(), changeSet, result.getDriveContents()) 
          .setResultCallback(fileCallBack); 

       } 

      }; 

    final ResultCallback<DriveFolder.DriveFileResult> fileCallBack = new ResultCallback<DriveFolder.DriveFileResult>() { 
     @Override 
     public void onResult(DriveFolder.DriveFileResult driveFileResult) { 

      if (!driveFileResult.getStatus().isSuccess()) { 
       Log.v(TAG, "Error while trying to create the file"); 
       return; 
      } 
      //Initialize mFile to be processed in AsyncTask 
      DriveFile mfile = driveFileResult.getDriveFile(); 
      new EditContentsAsyncTask(UploadFileActivity.this).execute(mfile); 

     } 
    }; 

    public class EditContentsAsyncTask extends ApiClientAsyncTask<DriveFile, Void, Boolean> { 

     public EditContentsAsyncTask(Context context) { 
      super(context); 
     } 

     @Override 
     protected Boolean doInBackgroundConnected(DriveFile... args) { 
      DriveFile file = args[0]; 
      try { 

       DriveApi.DriveContentsResult driveContentsResult = file.open(
         getGoogleApiClient(), DriveFile.MODE_WRITE_ONLY, null).await(); 


       if (!driveContentsResult.getStatus().isSuccess()) { 
        return false; 
       } 

       DriveContents driveContents = driveContentsResult.getDriveContents(); 



       //edit the outputStream 
       String inFileName = Environment.getExternalStorageDirectory().getPath() + "/Android/data/somePath/editor.xml" ; 
       File backupFile = new File(inFileName); 
       FileInputStream inputStream = new FileInputStream(backupFile); 
       BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream); 
       byte[] buffer = new byte[8 * 1024]; 

       BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(driveContents.getOutputStream()); 
       int n = 0; 
       while ((n = bufferedInputStream.read(buffer)) > 0) { 
        bufferedOutputStream.write(buffer, 0, n); 
       } 
       bufferedInputStream.close(); 


       com.google.android.gms.common.api.Status status = 
         driveContents.commit(getGoogleApiClient(), null).await(); 
       return status.getStatus().isSuccess(); 
      } catch (IOException e) { 
       Log.e(TAG, "IOException while appending to the output stream", e); 
      } 
      return false; 
     } 

     @Override 
     protected void onPostExecute(Boolean result) { 
      if (!result) { 
       showMessage("Error while editing contents"); 
       return; 
      } 
      showMessage("Successfully edited contents"); 
     } 
    } 
}

你能不能给我一个提示，或者告诉我什么，我做错了什么？预先感谢您。

来源

2016-06-16 Alex

嗯，我找到了一个解决方案。而且，由于我还没有发现类似的问题，我wont'd删除这一项，但会给出一个答案，为子孙后代:)

着想你必须改变这些行：

while ((n = bufferedInputStream.read(buffer)) > 0) { 
    bufferedOutputStream.write(buffer, 0, n); 
}

对那些：

while ((n = bufferedInputStream.read(buffer, 0, buffer.length)) > 0) { 
    bufferedOutputStream.write(buffer, 0, n); 
    bufferedOutputStream.flush(); 
}

它是什么。

来源

2016-06-16 12:40:08 Alex

Android Google Drive API上传文件 - 写入内容错误

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