我在 Google Drive Android 应用程序上遇到了“java.lang.IllegalArgumentException：名称不能为空：null”异常。
我已经谷歌搜索好几天了，没有任何线索。
这是我的代码（一个简单的例子），用于获取 Google Drive 上的文件列表：
（它是从这里获取的：Google 云端硬盘 SDK 异常 https://stackoverflow.com/questions/13462952/google-drive-sdk-exception)
import java.io.IOException;
import java.util.ArrayList;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import com.google.android.gms.auth.GoogleAuthException;
import com.google.android.gms.auth.GoogleAuthUtil;
import com.google.android.gms.auth.UserRecoverableAuthException;
import com.google.android.gms.common.AccountPicker;
import com.google.api.client.auth.oauth2.BearerToken;
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.android.http.AndroidHttp;
import com.google.api.client.googleapis.extensions.android.accounts.GoogleAccountManager;
import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential;
import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.json.JsonHttpRequest;
import com.google.api.client.http.json.JsonHttpRequestInitializer;
import com.google.api.client.json.jackson.JacksonFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.Drive.Files;
import com.google.api.services.drive.DriveRequest;
import com.google.api.services.drive.DriveScopes;
import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;
import com.maiko.xscanpet.R;
import com.maiko.xscanpet.cloud.GDriveHelper;
public class Fool_5 extends Activity {
private static final int CHOOSE_ACCOUNT=0;
private static String accountName;
private static int REQUEST_TOKEN=0;
private Button btn_drive;
private Context ctx = this;
private Activity a = this;
GoogleAccountCredential mCredential= null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set up the GUI layout
setContentView(R.layout.fool_5);
// set the variables to access the GUI controls
btn_drive = (Button) findViewById(R.id.btn_drive);
btn_drive.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
chooseAccount();
}
});
}
public void chooseAccount() {
Intent intent = AccountPicker.newChooseAccountIntent(null, null, new String[]{"com.google"}, false, null, null, null, null);
startActivityForResult(intent, CHOOSE_ACCOUNT);
}
// Fetch the access token asynchronously.
void getAndUseAuthTokenInAsyncTask(Account account) {
AsyncTask<Account, String, String> task = new AsyncTask<Account, String, String>() {
ProgressDialog progressDlg;
AsyncTask<Account, String, String> me = this;
@Override
protected void onPreExecute() {
progressDlg = new ProgressDialog(ctx, ProgressDialog.STYLE_SPINNER);
progressDlg.setMax(100);
progressDlg.setTitle("Validating...");
progressDlg.setMessage("Verifying the login data you entered...\n\nThis action will time out after 10 seconds.");
progressDlg.setCancelable(false);
progressDlg.setIndeterminate(false);
progressDlg.setOnCancelListener(new android.content.DialogInterface.OnCancelListener() {
public void onCancel(DialogInterface d) {
progressDlg.dismiss();
me.cancel(true);
}
});
progressDlg.show();
}
@Override
protected String doInBackground(Account... params) {
return getAccessToken(params[0]);
}
@Override
protected void onPostExecute(String s) {
if (s == null) {
// Wait for the extra intent
} else {
accountName = s;
getDriveFiles();
}
progressDlg.dismiss();
}
};
task.execute(account);
}
/**
* Fetches the token from a particular Google account chosen by the user. DO NOT RUN THIS DIRECTLY. It must be run asynchronously inside an AsyncTask.
* @param activity
* @param account
* @return
*/
private String getAccessToken(Account account) {
try {
return GoogleAuthUtil.getToken(ctx, account.name, "oauth2:" + DriveScopes.DRIVE); // IMPORTANT: DriveScopes must be changed depending on what level of access you want
} catch (UserRecoverableAuthException e) {
// Start the Approval Screen intent, if not run from an Activity, add the Intent.FLAG_ACTIVITY_NEW_TASK flag.
a.startActivityForResult(e.getIntent(), REQUEST_TOKEN);
e.printStackTrace();
return null;
} catch (GoogleAuthException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
private Drive getDriveService() {
mCredential = GoogleAccountCredential.usingOAuth2(this, DriveScopes.DRIVE);
mCredential.setSelectedAccountName(accountName);
return GDriveHelper.getDriveService(mCredential,getResources().getString(R.string.app_name));
}
/**
* Obtains a list of all files on the signed-in user's Google Drive account.
*/
private void getDriveFiles() {
Thread t = new Thread(new Runnable() {
@Override
public void run() {
Drive service = getDriveService();
Log.d("SiteTrack", "FUNCTION getDriveFiles()");
Files.List request;
try {
request = service.files().list(); // .setQ("mimeType=\"text/plain\"");
} catch (IOException e) {
e.printStackTrace();
return;
}
do {
FileList files;
try {
System.out.println("got here");
Log.d("SiteTrack", request.toString());
//mCredential.setSelectedAccountName(accountName);
files = request.execute();
} catch (IOException e) {
e.printStackTrace();
Log.d("SiteTrack", "Exception");
return;
}
ArrayList<File> fileList = (ArrayList<File>) files.getItems();
Log.d("SiteTrack", "Files found: " + files.getItems().size());
for (File f : fileList) {
String fileId = f.getId();
String title = f.getTitle();
Log.d("SiteTrack", "File " + fileId + ": " + title);
}
request.setPageToken(files.getNextPageToken());
} while (request.getPageToken() != null && request.getPageToken().length() >= 0);
}
});
t.start();
}
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
if (requestCode == CHOOSE_ACCOUNT && resultCode == RESULT_OK) {
accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
GoogleAccountManager gam = new GoogleAccountManager(this);
getAndUseAuthTokenInAsyncTask(gam.getAccountByName(accountName));
Log.d("SiteTrack", "CHOOSE_ACCOUNT");
} else if (requestCode == REQUEST_TOKEN && resultCode == RESULT_OK) {
accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
Log.d("SiteTrack", "REQUEST_TOKEN");
}
}
}
这会在 files = request.execute(); 上生成此跟踪；或任何 request.execute():
04-20 01:40:26.105: E/AndroidRuntime(27203): FATAL EXCEPTION: Thread-39033
04-20 01:40:26.105: E/AndroidRuntime(27203): java.lang.IllegalArgumentException: the name must not be empty: null
04-20 01:40:26.105: E/AndroidRuntime(27203): at android.os.Parcel.readException(Parcel.java:1429)
04-20 01:40:26.105: E/AndroidRuntime(27203): at android.os.Parcel.readException(Parcel.java:1379)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.android.gms.internal.x$a$a.a(Unknown Source)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential.getToken(GoogleAccountCredential.java:192)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential$RequestHandler.intercept(GoogleAccountCredential.java:217)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:888)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:407)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:340)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:458)
04-20 01:40:26.105: E/AndroidRuntime(27203): at com.maiko.fool.Fool_5$3.run(Fool_5.java:184)
04-20 01:40:26.105: E/AndroidRuntime(27203): at java.lang.Thread.run(Thread.java:856)
我对此感到迷失，不知道可能出了什么问题。我已经遵循了有关配置 Google API 服务的教程：https://plus.google.com/u/0/114042449736049687152/posts/CD3L8zcJg5Z https://plus.google.com/u/0/114042449736049687152/posts/CD3L8zcJg5Z
感谢您的帮助。
