我现在已经为此奋斗了 6 个小时。我遵循了 Dropbox 的“教程”（如果可以这样称呼它们，因为它们非常糟糕），使用了 DBRoulette 示例，并做了很多事情来让我的应用程序正常工作。
我的应用程序可以毫无问题地进行身份验证。但是，尽管完全按照教程正在做的事情，我还是无法上传任何东西：
这是我的一小段代码（这是为了将创建的笔记保存在手机本身上，然后上传到 Dropbox）：
saveBtn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View view)
{
try
{
//Create the directory if it doesn't exist. If it does exist the next two line won't do anything.
File dropNotesDir = new File(Environment.getExternalStorageDirectory() + "/documents/AppData/Dropnotes/");
dropNotesDir.mkdirs();
//-----------------------------------------------------------------------------------------------
String wholeNoteString = noteBody.getText().toString();
//Now we create the title of the txt file. It will be the first line of the whole note. The name will get truncated to 32 characters
//if it's too long.
String noteTitle;
if(wholeNoteString.indexOf("\n") >= 0) //New line character found.
{
noteTitle = wholeNoteString.substring(0, wholeNoteString.indexOf("\n"));
if(noteTitle.length() >= 32)
{
noteTitle = wholeNoteString.substring(0, 32);
}
}
else
{
if(wholeNoteString.length() >= 32)
{
noteTitle = wholeNoteString.substring(0, 32);
}else
{
noteTitle = wholeNoteString;
}
}
if(extras.getString("file-mode").equals("modify"))
{
//We will need to delete the existing file if it does exist to save the new one.
File existing = new File(Environment.getExternalStorageDirectory() + "/documents/AppData/Dropnotes/" + extras.getString("noteTitle"));
existing.delete();
}
File newNote = new File(Environment.getExternalStorageDirectory() + "/documents/AppData/Dropnotes/" + noteTitle + ".txt");
PrintWriter newNoteWriter = new PrintWriter(new FileOutputStream(newNote));
newNoteWriter.print(noteBody.getText().toString());
newNoteWriter.close();
//TRYING TO UPLOAD TO DROPBOX HERE
File fileToUpload = new File(Environment.getExternalStorageDirectory() + "/documents/AppData/Dropnotes/" + noteTitle + ".txt");
FileInputStream file2Uis = new FileInputStream(fileToUpload);
Entry newEntry = mDBApi.putFile("/" + noteTitle + ".txt", file2Uis, fileToUpload.length(), null, null);
//END OF TRYING TO UPLOAD TO DROPBOX HERE
Toast.makeText(view.getContext(), "Saved successfully", Toast.LENGTH_SHORT).show();
finish();
} catch (FileNotFoundException e)
{
Toast.makeText(view.getContext(), "File not found: " + e.getMessage(), Toast.LENGTH_SHORT).show();
e.printStackTrace();
} catch(Exception e)
{
Toast.makeText(view.getContext(), "Some bizarre exception occured: " + e.getClass().toString(), Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
});
它给了我一个 NetworkOnMainThreadException ，我不知道为什么。我正在尝试按照此处标题为“上传文件”的部分进行操作。他们的片段让我感到困惑的是，他们甚至没有试图捕捉我被抛出的异常......
有什么帮助吗？我真的需要在下周五完成这项工作。