朋友们，我已经将我的sqlite db文件从我的应用程序上传到谷歌驱动器，但文件大小显示0字节为什么？如何解决它以及如何上传实际原始文件（大小为108 kb）到谷歌驱动器。有没有其他解决方案，请任何人帮助我这是我的代码
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.IntentSender;
import android.os.Bundle;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.drive.Drive;
import com.google.android.gms.drive.DriveApi;
import com.google.android.gms.drive.DriveContents;
import com.google.android.gms.drive.DriveFolder;
import com.google.android.gms.drive.Metadata;
import com.google.android.gms.drive.MetadataChangeSet;
import com.google.android.gms.drive.query.Filters;
import com.google.android.gms.drive.query.Query;
import com.google.android.gms.drive.query.SearchableField;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
public class MainActivitySample extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private Button button_create_file;
private Button button_upload_to_google_drive;
private GoogleApiClient mGoogleApiClient;
private static final String TAG = "<< DRIVE >>";
protected static final int REQUEST_CODE_RESOLUTION = 1337;
private String FOLDER_NAME = "New Folder";
com.google.android.gms.common.api.GoogleApiClient GAC;
Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_sample);
button_create_file = (Button) findViewById(R.id.button_create_file);
button_upload_to_google_drive = (Button) findViewById(R.id.button_upload_to_google_drive);
button_create_file.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//WRITE A SIMPLE TEXT FILE IN SDCARD. BE CAREFUL TO GRANT PERMISSION IN ANDROID 6+
//writeToFile("tehfile", " I nenu");
}
});
button_upload_to_google_drive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mGoogleApiClient != null) {
upload_to_drive();
} else {
Log.e(TAG, "Could not fucking connect to google drive manager");
}
}
});
}
private void upload_to_drive() {
//async check if folder exists... if not, create it. continue after with create_file_in_folder(driveId);
check_folder_exists();
}
private void check_folder_exists() {
Query query =
new Query.Builder().addFilter(Filters.and(Filters.eq(SearchableField.TITLE, FOLDER_NAME), Filters.eq(SearchableField.TRASHED, false)))
.build();
Drive.DriveApi.query(mGoogleApiClient, query).setResultCallback(new ResultCallback<DriveApi.MetadataBufferResult>() {
@Override
public void onResult(DriveApi.MetadataBufferResult result) {
if (!result.getStatus().isSuccess()) {
Log.e(TAG, "Cannot create folder in the root.");
} else {
boolean isFound = false;
for (Metadata m : result.getMetadataBuffer()) {
if (m.getTitle().equals(FOLDER_NAME)) {
Log.e(TAG, "Folder exists");
isFound = true;
DriveId driveId = m.getDriveId();
create_file_in_folder(driveId);
break;
}
}
if (!isFound) {
Log.i(TAG, "Folder not found; creating it.");
MetadataChangeSet changeSet = new MetadataChangeSet.Builder().setTitle(FOLDER_NAME).build();
Drive.DriveApi.getRootFolder(mGoogleApiClient)
.createFolder(mGoogleApiClient, changeSet)
.setResultCallback(new ResultCallback<DriveFolder.DriveFolderResult>() {
@Override
public void onResult(DriveFolder.DriveFolderResult result) {
if (!result.getStatus().isSuccess()) {
Log.e(TAG, "U AR A MORON! Error while trying to create the folder");
} else {
Log.i(TAG, "Created a folder");
DriveId driveId = result.getDriveFolder().getDriveId();
create_file_in_folder(driveId);
}
}
});
}
}
}
});
}
private void create_file_in_folder(final DriveId driveId) {
Drive.DriveApi.newDriveContents(mGoogleApiClient).setResultCallback(new ResultCallback<DriveApi.DriveContentsResult>() {
@Override
public void onResult(@NonNull DriveApi.DriveContentsResult driveContentsResult) {
if (!driveContentsResult.getStatus().isSuccess()) {
Log.e(TAG, "U AR A MORON! Error while trying to create new file contents");
return;
}
OutputStream outputStream = driveContentsResult.getDriveContents().getOutputStream();
//------ THIS IS AN EXAMPLE FOR FILE --------
Toast.makeText(MainActivitySample.this, "Uploading to drive...", Toast.LENGTH_LONG).show();
final File theFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Hello/IKONNECTRETAIL.db"); //>>>>>> WHAT FILE ?
try {
FileInputStream fileInputStream = new FileInputStream(theFile);
byte[] buffer = new byte[1024];
//long size = theFile.length();
int bytesRead;
while ((bytesRead = fileInputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
} catch (IOException e1) {
Log.i(TAG, "U AR A MORON! Unable to write file contents.");
}
String mimeType = MimeTypeMap.getSingleton().getExtensionFromMimeType("db");
MetadataChangeSet changeSet = new MetadataChangeSet.Builder().setTitle(theFile.getName()).setMimeType(mimeType).setStarred(false).build();
DriveFolder folder = driveId.asDriveFolder();
folder.createFile(mGoogleApiClient, changeSet, driveContentsResult.getDriveContents())
.setResultCallback(new ResultCallback<DriveFolder.DriveFileResult>() {
@Override
public void onResult(@NonNull DriveFolder.DriveFileResult driveFileResult) {
if (!driveFileResult.getStatus().isSuccess()) {
Log.e(TAG, "U AR A MORON! Error while trying to create the file");
return;
}
Log.v(TAG, "Created a file: " + driveFileResult.getDriveFile().getDriveId());
}
});
}
});
}
@Override
protected void onResume() {
super.onResume();
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this).addApi(Drive.API)
.addScope(Drive.SCOPE_FILE)
.addScope(Drive.SCOPE_APPFOLDER) // required for App Folder sample
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
}
mGoogleApiClient.connect();
}
public void writeToFile(String fileName, String body) {
FileOutputStream fos = null;
try {
final File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/xtests/");
if (!dir.exists()) {
if (!dir.mkdirs()) {
Log.e("ALERT", "U AR A MORON! could not create the directories. CHECK THE FUCKING PERMISSIONS SON!");
}
}
final File myFile = new File(dir, fileName + "_" + String.valueOf(System.currentTimeMillis()) + ".txt");
if (!myFile.exists()) {
myFile.createNewFile();
}
fos = new FileOutputStream(myFile);
fos.write(body.getBytes());
fos.close();
Toast.makeText(MainActivitySample.this, "File created ok! Let me give you a fucking congratulations!", Toast.LENGTH_LONG).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
Log.v(TAG, "+++++++++++++++++++ onConnected +++++++++++++++++++");
}
@Override
public void onConnectionSuspended(int i) {
Log.e(TAG, "onConnectionSuspended [" + String.valueOf(i) + "]");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult result) {
Log.i(TAG, "GoogleApiClient connection failed: " + result.toString());
if (!result.hasResolution()) {
// show the localized error dialog.
GoogleApiAvailability.getInstance().getErrorDialog(this, result.getErrorCode(), 0).show();
return;
}
try {
result.startResolutionForResult(this, REQUEST_CODE_RESOLUTION);
} catch (IntentSender.SendIntentException e) {
Log.e(TAG, "U AR A MORON! Exception while starting resolution activity", e);
}
}
@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();
}
}
@Override
protected void onPause() {
if (mGoogleApiClient != null) {
mGoogleApiClient.disconnect();
}
super.onPause();
}
}
这是驱动器图片 enter image description here
请帮我谢谢你
答案 0 :(得分：0)
我的代码中没有找到任何 .commit（）。 文件操作后，您必须调用
contentsResult.getDriveContents().commit(mGoogleApiClient, null)
或 .discard（GoogleApiClient mGoogleApiClient）
下的更多信息创建文件后，只需执行
DriveFile file = driveFileResult.getDriveFile();
file.open(getGoogleApiClient(), DriveFile.MODE_READ_ONLY, null).setResultCallback(new ResultCallback<DriveApi.DriveContentsResult>() {
@Override
public void onResult(@NonNull DriveApi.DriveContentsResult driveContentsResult) {
OutputStream outputStream = contentsResult.getDriveContents().getOutputStream();
//your code here to write into output stream
outputStream.close();
contentsResult.getDriveContents().commit(mGoogleApiClient, null);
}