我想将我的应用程序中的db文件上传到google驱动器。我能够在谷歌驱动器中创建一个文件夹，但我没有得到如何上传数据库文件。
这是我的代码。
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.MimeTypeMap;
import android.widget.Button;
import android.widget.Toast;
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.DriveFile;
import com.google.android.gms.drive.DriveFolder;
import com.google.android.gms.drive.DriveFolder.DriveFolderResult;
import com.google.android.gms.drive.DriveId;
import com.google.android.gms.drive.Metadata;
import com.google.android.gms.drive.MetadataChangeSet;
import com.google.android.gms.drive.DriveApi.DriveContentsResult;
import com.google.api.client.http.FileContent;
//import com.google.api.services.drive.Drive;
import com.google.api.services.drive.Drive.Files;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;
//import com.google.api.services.drive.Drive;
public class MainActivity extends BaseDemoActivity {
private final static String TAG = "MainActivity";
DriveId folderId;
private static Uri fileUri;
@Override
public void onConnected(Bundle connectionHint) {
super.onConnected(connectionHint);
MetadataChangeSet changeSet = new MetadataChangeSet.Builder().setTitle("New folder").build();
Drive.DriveApi.getRootFolder(getGoogleApiClient())
.createFolder(getGoogleApiClient(), changeSet)
.setResultCallback(folderCreatedCallback);
saveToDrive();
}
ResultCallback<DriveFolderResult> folderCreatedCallback = new ResultCallback<DriveFolderResult>() {
@Override
public void onResult(DriveFolderResult result) {
if (!result.getStatus().isSuccess()) {
showMessage("Error while trying to create the folder");
return;
}
folderId = result.getDriveFolder().getDriveId();
showMessage("Created a folder: " + result.getDriveFolder().getDriveId());
}
};
final ResultCallback<DriveFolder.DriveFileResult> fileCallBack = new ResultCallback<DriveFolder.DriveFileResult>() {
@Override
public void onResult(DriveFolder.DriveFileResult driveFileResult) {
if (!driveFileResult.getStatus().isSuccess()) {
Log.v(TAG, "Error while trying to create the file");
return;
}
//Initialize mFile to be processed in AsyncTask
DriveFile mfile = driveFileResult.getDriveFile();
new EditContentsAsyncTask(MainActivity.this).execute(mfile);
}
};
public void saveToDrive()
{
fileUri = Uri.fromFile(new java.io.File(Environment.getDataDirectory().getPath()
+ "/data/com.example.dbupload/databases/Student"));
java.io.File fileContent = new java.io.File(fileUri.getPath());
FileContent mediaContent = new FileContent(getMimeType("db"), fileContent);
File body = new com.google.api.services.drive.model.File();
body.setTitle(fileContent.getName());
body.setMimeType(getMimeType("db"));
// File file = service.files().insert(body, mediaContent).execute();
}
public class EditContentsAsyncTask extends ApiClientAsyncTask<DriveFile, Void, Boolean> {
public EditContentsAsyncTask(Context context) {
super(context);
}
@Override
protected Boolean doInBackgroundConnected(DriveFile... args) {
DriveFile file = args[0];
try {
DriveContentsResult driveContentsResult = file.open(
getGoogleApiClient(), DriveFile.MODE_WRITE_ONLY, null).await();
if (!driveContentsResult.getStatus().isSuccess()) {
return false;
}
DriveContents driveContents = driveContentsResult.getDriveContents();
//edit the outputStream
DatabaseHandler db = new DatabaseHandler(MainActivity.this);
String inFileName = getApplicationContext().getDatabasePath(db.getDatabaseName()).getPath();
//DATABASE PATH
FileInputStream is = new FileInputStream(inFileName);
BufferedInputStream in = new BufferedInputStream(is);
byte[] buffer = new byte[8 * 1024];
BufferedOutputStream out = new BufferedOutputStream(driveContents.getOutputStream());
int n = 0;
while ((n = in.read(buffer)) > 0) {
out.write(buffer, 0, n);
}
in.close();
com.google.android.gms.common.api.Status status =
driveContents.commit(getGoogleApiClient(), null).await();
return status.getStatus().isSuccess();
} catch (IOException e) {
Log.e(TAG, "IOException while appending to the output stream", e);
}
return false;
}
@Override
protected void onPostExecute(Boolean result) {
if (!result) {
showMessage("Error while editing contents");
return;
}
showMessage("Successfully edited contents");
}
}
private String getMimeType(String string) {
// TODO Auto-generated method stub
return null;
}
}
我可以在云端硬盘中创建一个文件夹。请问有什么我可以帮我上传一个db文件吗？
答案 0 :(得分：6)
首先，我看到了这些导入的事实：
import com.google.api.client.http.FileContent;
...
import com.google.api.services.drive.Drive;
表示您正在混合GDAA和REST Api。除非你想进入trouble，否则不要这样做。
因此，当您获得FolderId时，它就是您的“DB＆＃39;”的父母。文件，我推测（如果DB文件是SQLite类型，那么你的MIME类型应该是＆＃39; application / x-sqlite3＆＃39;）。
无论如何，在GDAA中，您首先必须将java.io.File（代表＆＃39; DB＆＃39;）转换为 内容 。你必须提供 元数据 （如文件标题，mime类型，标志......）。你得到了正确的元数据，这是你绊倒的内容。以下代码片段可以满足您的需求（不要让我负责，我会在5分钟内将其抨击 - 不进行测试）
/******************************************************************
* create file in GOODrive
* @param pFldr parent's ID
* @param titl file name
* @param mime file mime type (application/x-sqlite3)
* @param file file (with content) to create
*/
static void saveToDrive(final DriveFolder pFldr, final String titl,
final String mime, final java.io.File file) {
if (getGoogleApiClient() != null && pFldr != null && titl != null && mime != null && file != null) try {
// create content from file
Drive.DriveApi.newDriveContents(getGoogleApiClient()).setResultCallback(new ResultCallback<DriveContentsResult>() {
@Override
public void onResult(DriveContentsResult driveContentsResult) {
DriveContents cont = driveContentsResult != null && driveContentsResult.getStatus().isSuccess() ?
driveContentsResult.getDriveContents() : null;
// write file to content, chunk by chunk
if (cont != null) try {
OutputStream oos = cont.getOutputStream();
if (oos != null) try {
InputStream is = new FileInputStream(file);
byte[] buf = new byte[4096];
int c;
while ((c = is.read(buf, 0, buf.length)) > 0) {
oos.write(buf, 0, c);
oos.flush();
}
}
finally { oos.close();}
// content's COOL, create metadata
MetadataChangeSet meta = new Builder().setTitle(titl).setMimeType(mime).build();
// now create file on GooDrive
pFldr.createFile(getGoogleApiClient(), meta, cont).setResultCallback(new ResultCallback<DriveFileResult>() {
@Override
public void onResult(DriveFileResult driveFileResult) {
if (driveFileResult != null && driveFileResult.getStatus().isSuccess()) {
// BINGO
} else {
// report error
}
}
});
} catch (Exception e) { e.printStackTrace(); }
}
});
} catch (Exception e) { e.printStackTrace(); }
}
我注意到，你正在调整这位官员＆＃39;您的项目GDAA DEMO。如果它不够或压倒性，你也可以看看这个demo，它采用不同的方法解决同样的问题。
祝你好运