我在Google云端硬盘API方面取得了一些进展，可以创建文件和文件夹。但是，我似乎无法弄清楚如何将文件夹从设备存储上传到Google Drive，或者如何在Drive Folders中创建文件夹或文件。 我也想知道如何在任何给定的驱动器文件夹中检索文件。 我将不胜感激，提供了带有示例的详细说明，而不提供指向官方文档的链接，因为我已经为之奋斗了好几天（而且我知道我不是唯一的一个）。
这是到目前为止我得到的代码。
public abstract class DriveActivity extends UtilsActivity {
private static final int REQUEST_CODE_SIGN_IN = 77;
public static final String PIONEER_DRIVE_ROOT_FOLDER = "Pioneer Backups ID_77";
public FileManagerHelper mFileManagerHelper;
private GoogleSignInClient mGoogleSignInClient;
private DriveClient mDriveClient;
public OptionsClass mOptionsClass;
/**
* Inits file manager and Google Sign In Client
*/
protected void Init() {
mFileManagerHelper = new FileManagerHelper(this);
mOptionsClass = new OptionsClass(getApplicationContext());
mGoogleSignInClient = buildSignInOptions();
if (loggedIntoGoogleDrive() && mOptionsClass.getEnableDrive()) {
/*
Create the main pioneer folder, where all the backups will be stored.
*/
//TODO heck if the folder already exists
// createFolder(getRootFolderTask(),
// new MetadataChangeSet.Builder()
// .setTitle(PIONEER_DRIVE_ROOT_FOLDER)
// .setDescription("Root Folder For All Pioneer Backups")
// .build(), false);
}
}
/**
* Sign user out of google account
*/
public void signOutOfGoogleDrive() {
onProcessStart(PROCESS_KEY_ACCOUNT_RELATED);
mGoogleSignInClient
.signOut()
/*
Success
*/
.addOnSuccessListener(aVoid -> {
onProcessEnd(PROCESS_KEY_ACCOUNT_RELATED);
Toast.makeText(DriveActivity.this, "Signed Out", Toast.LENGTH_SHORT).show();
})
/*
Failure
*/
.addOnFailureListener(e -> {
onProcessEnd(PROCESS_KEY_ACCOUNT_RELATED);
e.printStackTrace();
Toast.makeText(DriveActivity.this, "Failure " + e.getMessage(), Toast.LENGTH_SHORT).show();
})
/*
Completion
*/
.addOnCompleteListener(task -> {
onProcessEnd(PROCESS_KEY_ACCOUNT_RELATED);
Toast.makeText(DriveActivity.this, "Done", Toast.LENGTH_SHORT).show();
});
}
/**
* Get user data, to enable Google Drive
*
* @return ResourceClient
*/
public DriveResourceClient getDriveResourceClient() {
return Drive.getDriveResourceClient(getApplicationContext(), getGoogleAccount());
}
public boolean loggedIntoGoogleDrive() {
return getGoogleAccount() != null;
}
/**
* @return the las logged in account
*/
public GoogleSignInAccount getGoogleAccount() {
return GoogleSignIn.getLastSignedInAccount(this);
}
/**
* @return the scopes the user needs to grant to the app
*/
private Set<Scope> getRequiredScopes() {
Set<Scope> requiredScopes = new HashSet<>(2);
requiredScopes.add(Drive.SCOPE_FILE);
requiredScopes.add(Drive.SCOPE_APPFOLDER);
return requiredScopes;
}
/**
* Start sign in activity.
*/
public void signInToGoogleDrive() {
onProcessStart(PROCESS_KEY_ACCOUNT_RELATED);
/*
Check if we have all the required scopes and if the user if logged in
*/
if (loggedIntoGoogleDrive() && getGoogleAccount().getGrantedScopes().containsAll(getRequiredScopes())) {
initializeDriveClient(getGoogleAccount());
onProcessEnd(PROCESS_KEY_ACCOUNT_RELATED);
} else {
GoogleSignInOptions signInOptions =
new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestScopes(Drive.SCOPE_FILE)
.requestScopes(Drive.SCOPE_APPFOLDER)
.build();
GoogleSignInClient googleSignInClient = GoogleSignIn.getClient(this, signInOptions);
startActivityForResult(googleSignInClient.getSignInIntent(), REQUEST_CODE_SIGN_IN);
}
startActivityForResult(mGoogleSignInClient.getSignInIntent(), REQUEST_CODE_SIGN_IN);
}
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == REQUEST_CODE_SIGN_IN) {
onProcessEnd(PROCESS_KEY_ACCOUNT_RELATED);
}
}
public void initializeDriveClient(GoogleSignInAccount signInAccount) {
mDriveClient = Drive.getDriveClient(getApplicationContext(), signInAccount);
mDriveClient.getUploadPreferences().addOnSuccessListener(transferPreferences -> {
});
}
/**
* Build a Google SignIn client.
*/
private GoogleSignInClient buildSignInOptions() {
GoogleSignInOptions signInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestScopes(Drive.SCOPE_FILE)
.requestScopes(Drive.SCOPE_APPFOLDER)
.build();
return GoogleSignIn.getClient(this, signInOptions);
}
/**
* Uploads a file to drive
*
* @param file to upload
*/
public void uploadFileToDrive(File file, String des) {
if (!loggedIntoGoogleDrive()) {
signInToGoogleDrive();
return;
} else if (!mOptionsClass.getEnableDrive()) {
makeText("Enable Drive Backup First");
}
// getRootFolderTask()
// .continueWithTask(task -> {
//
// DriveFolder parentFolder = task.getResult();
//
// String fileName = file.getName();
//
// String from = file.getAbsolutePath();
//
// String fileDes =
// "Pioneer Backup File. Uploaded: " + CalendarHelper.getSimpleFormattedDateAndTime(true);
//
// MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
// .setTitle(fileName)
// .setMimeType("text/plain")
// .setDescription(fileDes + "_" + from)
// .setStarred(true)
// .build();
//
// return getDriveResourceClient().createFile(parentFolder, changeSet, null);
// })
// .addOnSuccessListener(this,
// driveFile -> {
// Toast.makeText(this, "Success", Toast.LENGTH_SHORT).show();
// })
// .addOnFailureListener(this, e -> {
// Toast.makeText(this, "Error " + e.getMessage(), Toast.LENGTH_SHORT).show();
// });
}
private Task<DriveFolder> getRootFolderTask() {
return getDriveResourceClient().getRootFolder();
}
/**
* Creates a file inside a folder
*/
private void createFile(@NonNull Task<DriveFolder> folderToGoIn, String name) {
addTaskListenerToDriveFolder(folderToGoIn.continueWithTask(task -> {
if (task.getResult() != null) {
DriveFolder parentFolder = task.getResult();
MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
.setTitle(name)
.setMimeType("text/plain")
.setStarred(true)
.build();
return getDriveResourceClient().createFolder(parentFolder, changeSet);
} else {
makeText("Error");
return null;
}
}), false);
}
private void createFolder(@NonNull Task<DriveFolder> folderToGoIn, MetadataChangeSet folderMetadata, boolean notify) {
addTaskListenerToDriveFolder(folderToGoIn
.continueWithTask(task -> {
if (task.getResult() != null) {
DriveFolder parentFolder = task.getResult();
return getDriveResourceClient().createFolder(parentFolder, folderMetadata);
} else {
makeText("Error");
return null;
}
}), notify);
}
private Task<DriveContents> readFile(DriveFile file) {
return getDriveResourceClient().openFile(file, DriveFile.MODE_READ_ONLY);
}
private Task<MetadataBuffer> getFoldersIn(DriveFolder driveFolder) {
Query query = new Query.Builder()
.addFilter(Filters.eq(SearchableField.MIME_TYPE, DriveFolder.MIME_TYPE))
.build();
return getDriveResourceClient().queryChildren(driveFolder, query);
}
public List<File> getDriveBackups() {
//TODO get actual files inside the backup folder
return getLocalBackups();
}
public void viewDriveBackups() {
/*
Open the Google Drive app to view the backups folder
*/
}
/**
* Adds task failure, success, complete and cancelled listeners.
* Automatically notifies the user of state
*
* @param task to add listeners
*/
private void addTaskListenerToDriveFolder(Task<DriveFolder> task, boolean notify) {
onProcessStart(PROCESS_KEY_BACKUP_RELATED);
task
.addOnCanceledListener(() -> {
onProcessEnd(PROCESS_KEY_BACKUP_RELATED);
if (notify)
makeText("Cancelled");
})
.addOnCompleteListener(task1 -> {
onProcessEnd(PROCESS_KEY_BACKUP_RELATED);
if (notify)
makeText("Completed");
})
.addOnSuccessListener(driveFolder -> {
onProcessEnd(PROCESS_KEY_BACKUP_RELATED);
if (notify)
makeText("Success");
})
.addOnFailureListener(this, e -> {
onProcessEnd(PROCESS_KEY_BACKUP_RELATED);
if (notify)
makeText("Error " + e.getMessage());
});
}
}