Question

我正在尝试在Google云端硬盘的Appdata文件夹中为我的应用程序创建电子表格文件，以将其用作远程数据库。

刚刚开始，我已经被卡住了。文件是正确创建的（？），但过了一会儿它们似乎消失了。

我这样做：

首先，在onCreate方法中，我登录我的Google帐户：

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
        .requestScopes(Drive.SCOPE_APPFOLDER)
        .requestEmail()
        .build();
mGoogleApiClient = new GoogleApiClient.Builder(this)
        .enableAutoManage(this, this)
        .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
        .addApi(Drive.API)
        .addConnectionCallbacks(this)
        .build();

signIn();

private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}

onActivityResult处理更新UI（显示用户的姓名和个人资料照片，在登录/退出方面都很棒）

然后，在onConnected（Bundle bundle）方法中，我试着找出用户是否已经在AppFolder中有现有数据库，如果没有，我要求他创建一个。

@Override
public void onConnected(Bundle bundle) {
queryDrive();
}

public void queryDrive() {
Query query = new Query.Builder().addFilter(Filters.eq(SearchableField.TITLE, DreamDbSchema.NAME_REMOTE)).build();

Drive.DriveApi.query(mGoogleApiClient, query).setResultCallback(new ResultCallback<DriveApi.MetadataBufferResult>() {
    @Override
    public void onResult(DriveApi.MetadataBufferResult metadataBufferResult) {
        MetadataBuffer buffer = metadataBufferResult.getMetadataBuffer();

        if (buffer != null) {
            if (buffer.getCount() == 0) {
                new AlertDialog.Builder(ListActivity.this).setTitle(R.string.no_database_on_gdrive)
                        .setMessage(R.string.no_database_on_gdrive_message)
                        .setCancelable(false)
                        .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                            }
                        })
                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Drive.DriveApi.newDriveContents(mGoogleApiClient).setResultCallback(driveContentsCallback);
                            }
                        })
                        .setNeutralButton(R.string.cancel_and_disconnect, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                signOut();
                            }
                        })
                        .show();
            } else {
                for (int i = 0; i < buffer.getCount(); i++) {
                    Log.d("DRIVE_FILES: ", buffer.get(i).getTitle());
                }
            }
        } else {
            Log.d("DRIVE_BUFFER: ", "null");
        }
    }
});
}

final private ResultCallback<DriveApi.DriveContentsResult> driveContentsCallback =
    new ResultCallback<DriveApi.DriveContentsResult>() {
        @Override
        public void onResult(DriveApi.DriveContentsResult result) {
            if (!result.getStatus().isSuccess()) {
                Toast.makeText(ListActivity.this, R.string.error_while_creating_GDrive_file, Toast.LENGTH_SHORT).show();
                return;
            }

            MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
                    .setTitle(DreamDbSchema.NAME_REMOTE)
                    .setMimeType("vnd.google-apps.spreadsheet")
                    .build();
            Drive.DriveApi.getAppFolder(mGoogleApiClient)
                    .createFile(mGoogleApiClient, changeSet, result.getDriveContents())
                    .setResultCallback(fileCallback);
        }
    };


final private ResultCallback<DriveFolder.DriveFileResult> fileCallback = new
    ResultCallback<DriveFolder.DriveFileResult>() {
        @Override
        public void onResult(DriveFolder.DriveFileResult result) {
            if (!result.getStatus().isSuccess()) {
                Toast.makeText(ListActivity.this, R.string.error_while_creating_GDrive_file, Toast.LENGTH_SHORT).show();
                return;
            }
            Toast.makeText(ListActivity.this, getString(R.string.database_created_GD), Toast.LENGTH_SHORT).show();
        }
    };

一切似乎都运转了大约10分钟。在另一个活动中，我可以成功删除此文件：

    @Override
    public void onClick(View v) {
        if (!mGoogleApiClient.isConnected()) {
            Toast.makeText(SettingsActivity.this, R.string.not_loged_in, Toast.LENGTH_SHORT).show();
        } else {
            Drive.DriveApi.getAppFolder(mGoogleApiClient).listChildren(mGoogleApiClient).setResultCallback(new ResultCallback<DriveApi.MetadataBufferResult>() {
                @Override
                public void onResult(final DriveApi.MetadataBufferResult metadataBufferResult) {
                        Log.d("DRIVE_FILES: ", String.valueOf(metadataBufferResult.getMetadataBuffer().getCount()));
                    for (int i = 0; i < metadataBufferResult.getMetadataBuffer().getCount(); i++) {
                        final int j = i;
                        DriveId fileId = metadataBufferResult.getMetadataBuffer().get(i).getDriveId();
                        Drive.DriveApi.getFile(mGoogleApiClient, fileId).delete(mGoogleApiClient).setResultCallback(new ResultCallback<Status>() {
                            @Override
                            public void onResult(Status status) {
                                if (status.isSuccess()) {
                                    Toast.makeText(SettingsActivity.this, R.string.database_removed_GD, Toast.LENGTH_SHORT).show();
                                }
                            }
                        });
                    }
                }
            });
        }
    }

它还会在日志“1”中打印一段时间。但是给它一个十分钟左右，我再次提示创建数据库，因为它发现Appdata文件夹为空。

Google云端硬盘Appdata文件夹中的数据正在消失

0 个答案: