已编辑：我已将文字设置为字符串，如下所示：
String text =（“Hello！”）;
我想将其转换为纯文本文件，然后上传到Google云端硬盘文件夹。我已经尝试了下面的代码，但它没有完整，所以我不能说出现了什么错误。
我正在使用Google云端硬盘“快速启动”演示，并尝试根据我的需要定制它。链接：https://github.com/googledrive/android-quickstart
DriverClass：
public class UploadDrive extends Activity implements ConnectionCallbacks,OnConnectionFailedListener {
private static final String TAG = "androiddrivequickstart";
private static final int REQUEST_CODE_CAPTURE_IMAGE = 1;
private static final int REQUEST_CODE_CREATOR = 2;
private static final int REQUEST_CODE_RESOLUTION = 3;
private GoogleApiClient mGoogleApiClient;
private Bitmap mBitmapToSave;
private void saveFileToDrive() {
// Start by creating a new contents, and setting a callback.
Log.i(TAG, "Creating new contents.");
//How to call? Can i use File from java.io?
final Bitmap image = mBitmapToSave;
Drive.DriveApi.newDriveContents(mGoogleApiClient).setResultCallback(new ResultCallback<DriveContentsResult>() {
@Override
public void onResult(DriveContentsResult result) {
// If the operation was not successful, we cannot do anything
// and must
// fail.
if (!result.getStatus().isSuccess()) {
Log.i(TAG, "Failed to create new contents.");
return;
}
// Otherwise, we can write our data to the new contents.
Log.i(TAG, "New contents created.");
// Get an output stream for the contents.
OutputStream outputStream = result.getDriveContents().getOutputStream();
// Write the bitmap data from it.
ByteArrayOutputStream textFile = new ByteArrayOutputStream();
//image.compress(Bitmap.CompressFormat.PNG, 100, textFile);
try {
outputStream.write(textFile.toByteArray());
} catch (IOException e1) {
Log.i(TAG, "Unable to write file contents.");
}
// Create the initial metadata - MIME type and title.
// Note that the user will be able to change the title later.
MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
.setMimeType("text/plain").setTitle("Log: test.txt").build();
// Create an intent for the file chooser, and start it.
IntentSender intentSender = Drive.DriveApi
.newCreateFileActivityBuilder()
.setInitialMetadata(metadataChangeSet)
.setInitialDriveContents(result.getDriveContents())
.build(mGoogleApiClient);
try {
startIntentSenderForResult(
intentSender, REQUEST_CODE_CREATOR, null, 0, 0, 0);
} catch (SendIntentException e) {
Log.i(TAG, "Failed to launch file chooser.");
}
}
});
}
@Override
protected void onResume() {
super.onResume();
if (mGoogleApiClient == null) {
// Create the API client and bind it to an instance variable.
// We use this instance as the callback for connection and connection
// failures.
// Since no account name is passed, the user is prompted to choose.
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
// Connect the client. Once connected, the camera is launched.
mGoogleApiClient.connect();
}
@Override
protected void onPause() {
if (mGoogleApiClient != null) {
mGoogleApiClient.disconnect();
}
super.onPause();
}
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
switch (requestCode) {
case REQUEST_CODE_CAPTURE_IMAGE:
// Called after a photo has been taken.
if (resultCode == Activity.RESULT_OK) {
// Store the image data as a bitmap for writing later.
mBitmapToSave = (Bitmap) data.getExtras().get("data");
}
break;
case REQUEST_CODE_CREATOR:
// Called after a file is saved to Drive.
if (resultCode == RESULT_OK) {
Log.i(TAG, "Image successfully saved.");
mBitmapToSave = null;
// Just start the camera again for another photo.
startActivityForResult(new Intent(MediaStore.ACTION_IMAGE_CAPTURE),REQUEST_CODE_CAPTURE_IMAGE);
}
break;
}
}
@Override
public void onConnectionFailed(ConnectionResult result) {
// Called whenever the API client fails to connect.
Log.i(TAG, "GoogleApiClient connection failed: " + result.toString());
if (!result.hasResolution()) {
// show the localized error dialog.
GooglePlayServicesUtil.getErrorDialog(result.getErrorCode(), this, 0).show();
return;
}
// The failure has a resolution. Resolve it.
// Called typically when the app is not yet authorized, and an
// authorization
// dialog is displayed to the user.
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) {
Log.i(TAG, "API client connected.");
if (mBitmapToSave == null) {
// This activity has no UI of its own. Just start the camera.
startActivityForResult(new Intent(MediaStore.ACTION_IMAGE_CAPTURE),
REQUEST_CODE_CAPTURE_IMAGE);
return;
}
saveFileToDrive();
}
@Override
public void onConnectionSuspended(int cause) {
Log.i(TAG, "GoogleApiClient connection suspended");
}
}
如何调用另一个名为MainActivity的类中的finalResultText，以便将其转换为纯文本文件以上传到Google云端硬盘文件夹？
答案 0 :(得分：6)
假设您提问：'我如何将文本文件上传到Google云端硬盘？'，以下是快速概述：
1 /通过developers console授权您的应用，请参阅this。基本上，告诉Google您的SHA1 /'package-name'代表的应用需要访问Drive API（请勿在同意屏幕上忘记您的电子邮件地址）。此授权适用于REST和GDAA API。
2 /决定是否要使用REST或GDAA API来访问云端硬盘。每个都有advantages/disadvantages（但这是一个很长的故事）。
3 /看一下REST/GDAA wrapper demo here，它在MainActivity类中有app授权过程（参见onConnFail（）方法），以及REST和{{3}的基本CRUD方法在他们各自的班级。
祝你好运
<强>更新
根据您在下面的评论，我假设您想强制QuickStart演示适合您。请记住，GDAA（或REST）不关心内容是什么它只是一堆字节。因此，当QuickStart将Bitmap转换为PNG并将输出流与其字节一起提供时，您必须使用一堆字节来完成。我快速将下面的两个原语拼凑在一起，这将为DriveContents的输出流提供文件或字节数组（你可以将你所拥有的任何内容转换成文件或字节[]）。
DriveContents file2Cont(DriveContents driveContents, java.io.File file) {
OutputStream oos = driveContents.getOutputStream();
if (oos != null) try {
InputStream is = new FileInputStream(file);
byte[] buf = new byte[8192];
int c = 0;
while ((c = is.read(buf, 0, buf.length)) > 0) {
oos.write(buf, 0, c);
oos.flush();
}
} catch (Exception e) {/*handle errors*/}
finally {
try {
oos.close();
} catch (Exception ignore) { }
}
return driveContents;
}
DriveContents bytes2Cont(DriveContents driveContents, byte[] buf) {
OutputStream os = driveContents.getOutputStream();
try { os.write(buf);
} catch (IOException e) {/*handle errors*/}
finally {
try { os.close();
} catch (Exception e) {/*handle errors*/}
}
return driveContents;
}