Question

我可以从google驱动器获取文件的驱动器ID。通过以下代码。

import com.example.googledrivetest2.ProcessDownload.DownloadFileAsync;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Result;
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.DriveApi.DriveContentsResult;
import com.google.android.gms.drive.DriveApi.DriveIdResult;
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.DriveFileResult;
import com.google.android.gms.drive.DriveId;
import com.google.android.gms.drive.DriveResource;
import com.google.android.gms.drive.Metadata;
import com.google.android.gms.drive.MetadataChangeSet;
import com.google.android.gms.drive.OpenFileActivityBuilder;

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Log.i(TAG, "in onActivityResult() - triggered on pressing Select");

        switch (requestCode) {

            case REQUEST_CODE_SELECT:
                if (resultCode == RESULT_OK) {
                    /*get the selected item's ID*/
                    DriveId driveId = (DriveId) data.getParcelableExtra(
                            OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID);//this extra contains the drive id of the selected file
                    Log.i(TAG, "Selected folder's ID: " + driveId.encodeToString());
                    Log.i(TAG, "Selected folder's Resource ID: " + driveId.getResourceId());// this is the id of the actual file
                    Toast.makeText(getApplicationContext()," my id: "+driveId.getResourceId() , Toast.LENGTH_LONG).show();

                    DriveFile file = Drive.DriveApi.getFile(googleApiClient,driveId);
                   ....
                     }
                };

现在我想获取该文件的网址，以便我可以使用此LINK

传递要下载的网址

Answer 1

你尝试过这种方法吗？

DriveFile file = Drive.DriveApi.getFile(googleApiClient,driveId);
MetadataResult mdRslt = file.getMetadata(googleApiClient).await();
if (mdRslt != null && mdRslt.getStatus().isSuccess()) {
   String link = mdRslt.getMetadata().getWebContentLink();
   Log.d("LINK", link);
}

Answer 2

以下代码将为您获取网址。

String downloadUrl = file.getWebContentLink();

通过简单的Google搜索找到它：https://developers.google.com/drive/web/manage-downloads#downloading_files_in_a_browser

完整代码：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.i(TAG, "in onActivityResult() - triggered on pressing Select");

    switch (requestCode) {

        case REQUEST_CODE_SELECT:
            if (resultCode == RESULT_OK) {
                /*get the selected item's ID*/
                DriveId driveId = (DriveId) data.getParcelableExtra(
                        OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID);//this extra contains the drive id of the selected file
                Log.i(TAG, "Selected folder's ID: " + driveId.encodeToString());
                Log.i(TAG, "Selected folder's Resource ID: " + driveId.getResourceId());// this is the id of the actual file
                Toast.makeText(getApplicationContext(), " my id: " + driveId.getResourceId(), Toast.LENGTH_LONG).show();

                DriveFile file = Drive.DriveApi.getFile(googleApiClient, driveId);

                //get download url
                String downloadUrl = file.getWebContentLink();
                //do something with the url, for example:
                System.out.println("Download URL: " + downloadUrl);
                //more info here: https://developers.google.com/drive/web/manage-downloads#downloading_files_in_a_browser
            }
    }
}

示例：

import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;

import java.io.IOException;
import java.io.InputStream;

// ...

public class MyClass {

    // ...

    /**
     * Download a file's content.
     *
     * @param service Drive API service instance.
     * @param file Drive File instance.
     * @return InputStream containing the file's content if successful,
     *         {@code null} otherwise.
     */
    private static InputStream downloadFile(Drive service, File file) {
        if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
            try {
                // uses alt=media query parameter to request content
                return service.files().get(file.getId()).executeMediaAsInputStream();
            } catch (IOException e) {
                // An error occurred.
                e.printStackTrace();
                return null;
            }
        } else {
            // The file doesn't have any content stored on Drive.
            return null;
        }
    }

    // ...
}

Answer 3

您使用的是错误的库。

您目前正在使用Google Drive Android API。这只能访问存储在设备上的云端硬盘应用中的文件。它不允许您访问云中的Drive文件。这就是您看到classCastExceptions的原因。

首先删除所有导入语句，然后将其替换为Google Drive Java库中的等效语句。作为一个简单的线索，任何使用.gms的导入都是错误的。

Answer 4

如果主要目的是下载文件，您可以使用android-sdk中的示例。您将需要driveID，但如果您有，则可以使用该示例。你会在这里找到它： ./android-sdk/extras/google/google_play_services/drive/demo 查找名为：RetreiveContentsWithProgressDialog.java

的文件

该文件显示了如何使用进度条编写下载。

如何在Android中下载谷歌驱动器文件的URL

4 个答案: