尝试将所有文件放在文件夹中但获取result.getDriveFolder（）。getDriveId（）。getResourceId（）始终为null。我搜索并找到了一些链接，我尝试使用此链接enter link description here
中提到的步骤这是我的代码： -
public class MainActivity extends Activity implements ConnectionCallbacks,
OnConnectionFailedListener {
public ArrayList songsList = new ArrayList();
private static final String TAG = "drive-quickstart";
private GoogleApiClient mGoogleApiClient;
public static ArrayList<File> listAllMusicFiles = new ArrayList<File>();
protected static final int REQUEST_CODE_RESOLUTION = 1;
protected static final int NEXT_AVAILABLE_REQUEST_CODE = 2;
private DriveId mFolderDriveId;
public static final String EXISTING_FOLDER_ID = "0B2EEtIjPUdX6MERsWlYxN3J6RU0";
public static final String EXISTING_FILE_ID = "0ByfSjdPVs9MZTHBmMVdSeWxaNTg";
/**
* Extra for account name.
*/
protected static final String EXTRA_ACCOUNT_NAME = "account_name";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final File mainDir = new File(Environment.getExternalStorageDirectory()
.getPath());
loadSdcardfiles(mainDir);
}
/**
* Create a new file and save it to Drive.
*/
private void saveFileToDrive(final File file) {
Log.i(TAG, "Creating new contents.");
Drive.DriveApi.newDriveContents(mGoogleApiClient).setResultCallback(
new ResultCallback<DriveApi.DriveContentsResult>() {
@Override
public void onResult(DriveApi.DriveContentsResult result) {
if (!result.getStatus().isSuccess()) {
Log.i(TAG, "Failed to create new contents.");
return;
}
final DriveContents driveContents = result
.getDriveContents();
Log.i(TAG, "New contents created.");
OutputStream outputStream = result.getDriveContents()
.getOutputStream();
try {
@SuppressWarnings("resource")
FileInputStream fileInputStream = new FileInputStream(
file);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = fileInputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
} catch (IOException e1) {
Log.i(TAG, "Unable to write file contents.");
}
DriveFolder folder = mFolderDriveId.asDriveFolder();
MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
.setTitle(file.getName()).setStarred(true)
.build();
// create a file on root folder
folder.createFile(mGoogleApiClient, metadataChangeSet,
driveContents).setResultCallback(fileCallback);
// Drive.DriveApi
// .getRootFolder(mGoogleApiClient)
// .createFile(mGoogleApiClient,
// metadataChangeSet, driveContents)
// .setResultCallback(fileCallback);
try {
} catch (Exception e) {
}
}
});
}
private void loadSdcardfiles(File aFile) {
if (aFile.isFile()) {
if (aFile.getAbsolutePath().endsWith(".mp3")) {
listAllMusicFiles.add(aFile);
}
} else if (aFile.isDirectory()) {
File[] listOfFiles = aFile.listFiles();
if (listOfFiles != null) {
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
loadSdcardfiles(listOfFiles[i]);
}
}
} else {
}
}
}
@Override
protected void onResume() {
super.onResume();
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API).addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
}
mGoogleApiClient.connect();
}
@Override
protected void onPause() {
if (mGoogleApiClient != null) {
mGoogleApiClient.disconnect();
}
super.onPause();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE_RESOLUTION && resultCode == RESULT_OK) {
mGoogleApiClient.connect();
}
}
public void showMessage(String message) {
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i(TAG, "GoogleApiClient connection failed: " + result.toString());
if (!result.hasResolution()) {
GoogleApiAvailability.getInstance()
.getErrorDialog(this, result.getErrorCode(), 0).show();
return;
}
try {
result.startResolutionForResult(this, REQUEST_CODE_RESOLUTION);
} catch (SendIntentException e) {
Log.e(TAG, "Exception while starting resolution activity", e);
}
}
@Override
public void onConnected(Bundle connectionHint) {
Toast.makeText(this, "API client connected" + listAllMusicFiles.get(0),
1000).show();
if (listAllMusicFiles.size() == 0) {
return;
} else {
MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
.setTitle("Siddharth").build();
Drive.DriveApi.getRootFolder(mGoogleApiClient)
.createFolder(mGoogleApiClient, changeSet)
.setResultCallback(callback);
}
}
@Override
public void onConnectionSuspended(int cause) {
Toast.makeText(this, "GoogleApiClient connection suspended", 1000)
.show();
}
final private ResultCallback<DriveIdResult> idCallback = new ResultCallback<DriveIdResult>() {
@Override
public void onResult(DriveIdResult result) {
if (!result.getStatus().isSuccess()) {
showMessage("Cannot find DriveId. Are you authorized to view this file?");
return;
}
mFolderDriveId = result.getDriveId();
for (int i = 0; i < listAllMusicFiles.size(); i++) {
saveFileToDrive(listAllMusicFiles.get(i));
}
}
};
final ResultCallback<DriveFolderResult> callback = new ResultCallback<DriveFolderResult>() {
@Override
public void onResult(final DriveFolderResult result) {
if (!result.getStatus().isSuccess()) {
showMessage("Error while trying to create the folder");
return;
}
showMessage("Created a folder: "
+ result.getDriveFolder().getDriveId());
mFolderDriveId = result.getDriveFolder().getDriveId();
DriveFolder folder = Drive.DriveApi.getFolder(mGoogleApiClient,
result.getDriveFolder().getDriveId());
folder.addChangeSubscription(mGoogleApiClient);
}
};
final private ResultCallback<DriveFileResult> fileCallback = new ResultCallback<DriveFileResult>() {
@Override
public void onResult(DriveFileResult result) {
if (!result.getStatus().isSuccess()) {
showMessage("Error while trying to create the file");
return;
}
showMessage("Created a file with content: "
+ result.getDriveFile().getDriveId());
}
};
public class MyDriveEventService extends DriveEventService {
@Override
public void onChange(ChangeEvent event) {
Log.d(TAG, event.toString());
Drive.DriveApi.fetchDriveId(mGoogleApiClient,
mFolderDriveId.getResourceId()).setResultCallback(
idCallback);
}
}
}
任何人都可以建议我如何做到这一点，在此先感谢
答案 0 :(得分：0)
最后是的，它在我提供的链接中...
这是我所做的改变
@Override
public void onConnected(Bundle connectionHint) {
Toast.makeText(this, "API client connected" + listAllMusicFiles.get(0),
1000).show();
if (listAllMusicFiles.size() == 0) {
return;
} else {
if (count == 0) {
count++;
mcreateFolder();
}
}
}
public void mcreateFolder() {
MetadataChangeSet changeSet = new MetadataChangeSet.Builder().setTitle(
"Siddharth").build();
Drive.DriveApi.getRootFolder(mGoogleApiClient)
.createFolder(mGoogleApiClient, changeSet)
.setResultCallback(callback);
}
final ResultCallback<DriveFolderResult> callback = new ResultCallback<DriveFolderResult>() {
@Override
public void onResult(final DriveFolderResult result) {
if (!result.getStatus().isSuccess()) {
showMessage("Error while trying to create the folder");
return;
}
showMessage("Created a folder: "
+ result.getDriveFolder().getDriveId());
mFolderDriveId = result.getDriveFolder().getDriveId();
Drive.DriveApi.getFolder(mGoogleApiClient, mFolderDriveId)
.addChangeListener(mGoogleApiClient, mChgeLstnr);
mCnt = 0;
mPoker = new Handler();
mPoker.postDelayed(mPoke, mWait);
}
};
final private ChangeListener mChgeLstnr = new ChangeListener() {
@Override
public void onChange(ChangeEvent event) {
// showMessage("event: " + event + " resId: "
// + event.getDriveId().getResourceId());
}
};
private final Runnable mPoke = new Runnable() {
public void run() {
if (mPoker != null && mFolderDriveId != null
&& mFolderDriveId.getResourceId() == null
&& (mCnt++ < ENOUGH)) {
MetadataChangeSet meta = new MetadataChangeSet.Builder()
.build();
Drive.DriveApi
.getFolder(mGoogleApiClient, mFolderDriveId)
.updateMetadata(mGoogleApiClient, meta)
.setResultCallback(
new ResultCallback<DriveResource.MetadataResult>() {
@Override
public void onResult(
DriveResource.MetadataResult result) {
if (result.getStatus().isSuccess()
&& result.getMetadata()
.getDriveId()
.getResourceId() != null) {
showMessage("resId COOL "
+ result.getMetadata()
.getDriveId()
.getResourceId());
mPoker.removeCallbacksAndMessages(mPoke);
Drive.DriveApi.fetchDriveId(
mGoogleApiClient,
result.getMetadata()
.getDriveId()
.getResourceId())
.setResultCallback(
idCallback);
} else {
mPoker.postDelayed(mPoke,
mWait *= 2);
}
}
});
} else {
mPoker = null;
}
}
};
非常感谢@seanpj的精彩阐述。
cannot get folderId that i just created on google drive
Unpredictable result of DriveId.getResourceId() in Google Drive Android API
我非常感谢你的努力。