如何使用Dropbox API将文件（图形，音频和视频文件）上传到Dropbox？我按照Dropbox SDK Android页面上的教程进行操作，可以使样本生效。但是现在我想要上传一个实际的File对象而不是String，而且还在苦苦挣扎。
示例代码没有任何问题，看起来像这样：
String fileContents = "Hello World!";
ByteArrayInputStream inputStream = new ByteArrayInputStream(fileContents.getBytes());
try {
Entry newEntry = mDBApi.putFile("/testing_123456.txt", inputStream, fileContents.length(), null, null);
} catch (DropboxUnlinkedException e) {
Log.e("DbExampleLog", "User has unlinked.");
} catch (DropboxException e) {
Log.e("DbExampleLog", "Something went wrong while uploading.");
}
但是当我尝试更改它并使用以下代码上传实际文件时：
File tmpFile = new File(fullPath, "IMG_2012-03-12_10-22-09_thumb.jpg");
// convert File to byte[]
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(tmpFile);
bos.close();
oos.close();
byte[] bytes = bos.toByteArray();
ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
try {
Entry newEntry = mDBApi.putFile("/IMG_2012-03-12_10-22-09_thumb.jpg", inputStream, tmpFile.length(), null, null);
} catch (DropboxUnlinkedException e) {
Log.e("DbExampleLog", "User has unlinked.");
} catch (DropboxException e) {
Log.e("DbExampleLog", "Something went wrong while uploading.");
}
我没有成功收到DropboxException错误。我认为我尝试将File对象转换为字节流的东西必定是错误的，但这只是一个假设。
除了String示例之外，Android的Dropbox页面上没有其他内容记录。
感谢您的帮助。
答案 0 :(得分：23)
我找到了解决方案 - 如果有人对这里感兴趣的是工作代码：
private DropboxAPI<AndroidAuthSession> mDBApi;//global variable
File tmpFile = new File(fullPath, "IMG_2012-03-12_10-22-09_thumb.jpg");
FileInputStream fis = new FileInputStream(tmpFile);
try {
DropboxAPI.Entry newEntry = mDBApi.putFileOverwrite("IMG_2012-03-12_10-22-09_thumb.jpg", fis, tmpFile.length(), null);
} catch (DropboxUnlinkedException e) {
Log.e("DbExampleLog", "User has unlinked.");
} catch (DropboxException e) {
Log.e("DbExampleLog", "Something went wrong while uploading.");
}
答案 1 :(得分：5)
以下是 Dropbox API 到上传和下载文件的另一种实现方式。 这可以针对任何类型的文件实现。
String file_name = "/my_file.txt";
String file_path = Environment.getExternalStorageDirectory()
.getAbsolutePath() + file_name;
AndroidAuthSession session;
public void initDropBox() {
AppKeyPair appKeys = new AppKeyPair(APP_KEY, APP_SECRET);
session = new AndroidAuthSession(appKeys);
mDBApi = new DropboxAPI<AndroidAuthSession>(session);
mDBApi.getSession().startOAuth2Authentication(MyActivity.this);
}
Entry response;
public void uploadFile() {
writeFileContent(file_path);
File file = new File(file_path);
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
response = mDBApi.putFile("/my_file.txt", inputStream,
file.length(), null, null);
Log.i("DbExampleLog", "The uploaded file's rev is: " + response.rev);
} catch (DropboxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void downloadFile() {
File file = new File(file_path);
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
DropboxFileInfo info = null;
try {
info = mDBApi.getFile("/my_file.txt", null, outputStream, null);
Log.i("DbExampleLog", "The file's rev is: "
+ info.getMetadata().rev);
} catch (DropboxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
if (mDBApi.getSession().authenticationSuccessful()) {
try {
// Required to complete auth, sets the access token on the
// session
mDBApi.getSession().finishAuthentication();
String accessToken = mDBApi.getSession().getOAuth2AccessToken();
/**
* You'll need this token again after your app closes, so it's
* important to save it for future access (though it's not shown
* here). If you don't, the user will have to re-authenticate
* every time they use your app. A common way to implement
* storing keys is through Android's SharedPreferences API.
*/
} catch (IllegalStateException e) {
Log.i("DbAuthLog", "Error authenticating", e);
}
}
}
- ＆gt;在子线程中调用uploadFile（）和downLoadFile（）方法，否则会给你异常
- ＆gt;为此使用AsyncTask并在doInBackground方法中调用上述方法。
希望这会有所帮助......谢谢
答案 2 :(得分：2)
此外，@ e-nature的答案会覆盖具有相同名称的文件，因此如果您不想要这种行为，只需使用.putFile代替.putFileOverwrite。 .putFile有一个额外的参数，你可以简单地将null添加到最后。 More info
答案 3 :(得分：2)
以下是另一个使用Dropbox v2 API但第三方SDK的示例。对于Google Drive，OneDrive和Box.com，它的工作方式完全相同。
// CloudStorage cs = new Box(context, "[clientIdentifier]", "[clientSecret]");
// CloudStorage cs = new OneDrive(context, "[clientIdentifier]", "[clientSecret]");
// CloudStorage cs = new GoogleDrive(context, "[clientIdentifier]", "[clientSecret]");
CloudStorage cs = new Dropbox(context, "[clientIdentifier]", "[clientSecret]");
new Thread() {
@Override
public void run() {
cs.createFolder("/TestFolder"); // <---
InputStream stream = null;
try {
AssetManager assetManager = getAssets();
stream = assetManager.open("UserData.csv");
long size = assetManager.openFd("UserData.csv").getLength();
cs.upload("/TestFolder/Data.csv", stream, size, false); // <---
} catch (Exception e) {
// TODO: handle error
} finally {
// TODO: close stream
}
}
}.start();
答案 4 :(得分：1)
根据Dropbox API V2的最新文档：
// Create Dropbox client
val config = DbxRequestConfig.newBuilder("dropbox/java-tutorial").build()
client = DbxClientV2(config, getString(R.string.token))
// Uploading file
FileInputStream(file).use { item ->
val metadata = client.files().uploadBuilder("/${file.absolutePath.substringAfterLast("/")}")
.uploadAndFinish(item)
}
如果要覆盖文件，则将其添加到客户端：
.withMode(WriteMode.OVERWRITE)
.uploadAndFinish(item)