我正在构建应用程序以在Google日历中插入事件，但它在event.getHtmlLink（）中返回Null。这意味着它无法插入事件。怎么做？
插入代码取自： - https://developers.google.com/google-apps/calendar/v3/reference/events/insert 和 实际快速启动代码来自： - https://developers.google.com/google-apps/calendar/quickstart/android
package com.example.joshiyogesh.eventreminderbear;
import android.Manifest;
import android.accounts.AccountManager;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.api.client.extensions.android.http.AndroidHttp;
import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential;
import com.google.api.client.googleapis.extensions.android.gms.auth.GooglePlayServicesAvailabilityIOException;
import com.google.api.client.googleapis.extensions.android.gms.auth.UserRecoverableAuthIOException;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.DateTime;
import com.google.api.client.util.ExponentialBackOff;
import com.google.api.services.calendar.CalendarScopes;
import com.google.api.services.calendar.model.Event;
import com.google.api.services.calendar.model.EventAttendee;
import com.google.api.services.calendar.model.EventDateTime;
import com.google.api.services.calendar.model.EventReminder;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import pub.devrel.easypermissions.AfterPermissionGranted;
import pub.devrel.easypermissions.EasyPermissions;
/**
* MainActivity used for Google Api. It demonstrates how to use authorization to
*add event in Google Calender
* */
public class MainActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks{
static final int REQUEST_ACCOUNT_PICKER = 1000;
static final int REQUEST_AUTHORIZATION = 1001;
static final int REQUEST_GOOGLE_PLAY_SERVICE = 1002;
static final int REQUEST_PERMISSION_GET_ACCOUNT = 1003;
private static final String PREF_ACCOUNT_NAME = "accountName";
GoogleAccountCredential googleAccountCredential;
private static final String[] scopes = {CalendarScopes.CALENDAR};
ProgressDialog progressDialog;
/**
* Create the main Activity.
* @param savedInstanceState previously saved instance state
* */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize credentials and service object
googleAccountCredential = GoogleAccountCredential.usingOAuth2(getApplicationContext(), Arrays.asList(scopes)).
setBackOff(new ExponentialBackOff());
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Calling Google Calendar API ...");
sendResultToApi();
}
/**
* Attempt to call the API, after verifying that all the preconditions are
* satisfied. The preconditions are: Google Play Services installed, an
* account was selected and the device currently has online access. If any
* of the preconditions are not satisfied, the app will prompt the user as
* appropriate.
*/
private void sendResultToApi(){
if(! isGooglePlayServiceAvailable()){
acquireGooglePlayService();
}
else if (googleAccountCredential.getSelectedAccountName() == null){
chooseAccount();
}
else if (! isDeviceOnline()){
Toast.makeText(MainActivity.this,"Check Your Network Connection",Toast.LENGTH_LONG).show();
}
else{
new MakeRequestTask(googleAccountCredential).execute();
}
}
/**
* Check that Google Play services APK is installed and up to date.
* @return true if Google Play Services is available and up to
* date on this device; false otherwise.
*/
private boolean isGooglePlayServiceAvailable(){
GoogleApiAvailability googleApiAvailability = GoogleApiAvailability.getInstance();
final int connectionStatusCode = googleApiAvailability.isGooglePlayServicesAvailable(this);
return connectionStatusCode == ConnectionResult.SUCCESS;
}
/**
* Checks whether Device has Active Network Connection or not.
* @return true if Network (Internet) is available ;
* false otherwise
*/
private boolean isDeviceOnline(){
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
return (networkInfo != null && networkInfo.isConnected());
}
/**
* Attempt to resolve a missing, out-of-date, invalid or disabled Google
* Play Services installation via a user dialog, if possible.
*/
private void acquireGooglePlayService(){
GoogleApiAvailability googleApiAvailability = GoogleApiAvailability.getInstance();
final int connectionStatusCode = googleApiAvailability.isGooglePlayServicesAvailable(this);
if (googleApiAvailability.isUserResolvableError(connectionStatusCode)){
showGooglePlayServiceAvailabilityErrorDialog(connectionStatusCode);
}
}
/**
*Display an Dialog showing Google Play Service is missing or Out of date
* @paramConnectionStatusCode code describing the prescence or Lack :: Goggle Play service on Device
*/
void showGooglePlayServiceAvailabilityErrorDialog(int connectionStatuscode){
GoogleApiAvailability googleApiAvailability = GoogleApiAvailability.getInstance();
Dialog dialog = googleApiAvailability.getErrorDialog(MainActivity.this,connectionStatuscode,REQUEST_GOOGLE_PLAY_SERVICE);
dialog.show();
}
/**
* Display currently LogIn Account on Device for selecting Account ,
*so that CalendarId can be get For That Account..
* Attempts to set the account used with the API credentials. If an account
* name was previously saved it will use that one; otherwise an account
* picker dialog will be shown to the user. The setting the
* account to use with the credentials object requires the app to have the
* GET_ACCOUNTS permission, which is requested here if it is not already
* present. The AfterPermissionGranted annotation indicates that this
* function will be rerun automatically whenever the GET_ACCOUNTS permission
* is granted.
* */
@AfterPermissionGranted(REQUEST_PERMISSION_GET_ACCOUNT)
private void chooseAccount(){
if (EasyPermissions.hasPermissions(this, android.Manifest.permission.GET_ACCOUNTS)){
String accountName = getPreferences(Context.MODE_PRIVATE).getString(PREF_ACCOUNT_NAME,null);
if (accountName != null){
googleAccountCredential.setSelectedAccountName(accountName);
sendResultToApi();
}
else {
//start a dialog so that user can select Acount Name
startActivityForResult(googleAccountCredential.newChooseAccountIntent(),REQUEST_ACCOUNT_PICKER);
}
}else {
// Request the GET_ACCOUNTS permission via a user dialog
EasyPermissions.requestPermissions(
this,
"This app needs to access your Google account (via Contacts).",
REQUEST_PERMISSION_GET_ACCOUNT,
Manifest.permission.GET_ACCOUNTS);
}
}
/**
* Called when an activity launched here (specifically, AccountPicker
* and authorization) exits, giving you the requestCode you started it with,
* the resultCode it returned, and any additional data from it.
* @paramrequestCode code indicating which activity result is incoming.
* @paramresultCode code indicating the result of the incoming
* activity result.
* @paramdata Intent (containing result data) returned by incoming
* activity result.
*/
@Override
protected void onActivityResult(int requestCode , int resultCode , Intent data){
super.onActivityResult(requestCode,resultCode,data);
switch (requestCode){
case REQUEST_GOOGLE_PLAY_SERVICE:
if (resultCode != RESULT_OK){
Toast.makeText(MainActivity.this,"This App Requires Google Play Service ! Please Install it and Try Again Later",Toast.LENGTH_LONG).show();
}else {
sendResultToApi();
}
break;
case REQUEST_ACCOUNT_PICKER:
if (resultCode == RESULT_OK && data != null &&
data.getExtras() != null) {
String accountName =
data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
if (accountName != null) {
SharedPreferences settings =
getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString(PREF_ACCOUNT_NAME, accountName);
editor.apply();
googleAccountCredential.setSelectedAccountName(accountName);
sendResultToApi();
}
}
break;
case REQUEST_AUTHORIZATION:
if (resultCode == RESULT_OK) {
sendResultToApi();
}
break;
}
}
/**
* Respond to requests for permissions at runtime for API 23 and above.
* @param requestCode The request code passed in
* requestPermissions(android.app.Activity, String, int, String[])
* @param permissions The requested permissions. Never null.
* @param grantResults The grant results for the corresponding permissions
* which is either PERMISSION_GRANTED or PERMISSION_DENIED. Never null.
*/
@Override
public void onRequestPermissionsResult(int requestCode,
@NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
EasyPermissions.onRequestPermissionsResult(
requestCode, permissions, grantResults, this);
}
/**---------methods implemented from EasyPermissions.PermissionCallbacks---------*/
@Override
public void onPermissionsGranted(int requestCode, List<String> perms) {
//Do nothing
}
@Override
public void onPermissionsDenied(int requestCode, List<String> perms) {
//Do nothing
}
/**------------------------------------------------------------------------------*/
/**
* An asynchronous task that handles the Google Calendar API call.
* Placing the API calls in their own task ensures the UI stays responsive.
*/
private class MakeRequestTask extends AsyncTask<Void,Void,Void>{
private com.google.api.services.calendar.Calendar mService = null;
private Exception mLastError = null;
Event event;
MakeRequestTask(GoogleAccountCredential credential) {
HttpTransport transport = AndroidHttp.newCompatibleTransport();
JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
mService = new com.google.api.services.calendar.Calendar.Builder(
transport, jsonFactory, credential)
.setApplicationName("Google Calendar API Android Quickstart")
.build();
}
@Override
protected void onPreExecute(){
progressDialog.show();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
progressDialog.hide();
Toast.makeText(MainActivity.this, "Your Event Has been Successfully added "+event.getHtmlLink(), Toast.LENGTH_LONG).show();
}
@Override
protected void onCancelled() {
super.onCancelled();
if (mLastError != null) {
if (mLastError instanceof GooglePlayServicesAvailabilityIOException) {
showGooglePlayServiceAvailabilityErrorDialog(
((GooglePlayServicesAvailabilityIOException) mLastError)
.getConnectionStatusCode());
} else if (mLastError instanceof UserRecoverableAuthIOException) {
startActivityForResult(
((UserRecoverableAuthIOException) mLastError).getIntent(),
MainActivity.REQUEST_AUTHORIZATION);
} else {
Toast.makeText(MainActivity.this,"The following error occurred:\n"+mLastError.getMessage(),Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(MainActivity.this,"Request Cancelled",Toast.LENGTH_LONG).show();
}
}
@Override
protected Void doInBackground(Void... params) {
createEvent();
return null;
}
/**
* createEvent() method help in adding Event in google play service Calendar
* */
private void createEvent(){
event = new Event()
.setSummary("There is Placement Drive")
.setLocation("Jalandhar")
.setDescription("Elite SmartCare Solutions is going to visit");
DateTime date = new DateTime("2017-04-11T09:00:00-05:30");
EventDateTime start = new EventDateTime()
.setDateTime(date)
.setTimeZone("Asia/Calcutta");
event.setStart(start);
DateTime endDateTime = new DateTime("2017-04-12T09:00:00-05:30");
EventDateTime end = new EventDateTime()
.setDateTime(endDateTime)
.setTimeZone("Asia/Calcutta");
event.setEnd(end);
String[] recurrence = new String[] {"RRULE:FREQ=DAILY;COUNT=2"};
event.setRecurrence(Arrays.asList(recurrence));
EventAttendee[] attendees = new EventAttendee[] {
new EventAttendee().setEmail("abc@nitj.ac.in"),
new EventAttendee().setEmail("xyz@gmail.com"),
};
event.setAttendees(Arrays.asList(attendees));
EventReminder[] reminderOverrides = new EventReminder[] {
new EventReminder().setMethod("email").setMinutes(24 * 60),
new EventReminder().setMethod("popup").setMinutes(10),
};
Event.Reminders reminders = new Event.Reminders()
.setUseDefault(false)
.setOverrides(Arrays.asList(reminderOverrides));
event.setReminders(reminders);
String calendarId = "primary";
try {
event = mService.events().insert(calendarId, event).execute();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
如何修复此代码，以便可以在Google日历中插入事件？
更新：1 Android Moniter的Logcat
04-09 17:41:54.362 3954-4015/com.example.joshiyogesh.eventreminderbear I/OpenGLRenderer: Initialized EGL, version 1.4
04-09 17:41:54.482 3954-4015/com.example.joshiyogesh.eventreminderbear D/OpenGLRenderer: Enabling debug mode 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: PartialUpdate status: Disabled
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Left Align: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Width Align: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Top Align: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Height Align: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Min ROI Width: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Min ROI Height: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Needs ROI Merge: 0
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Dynamic Fps: Enabled
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Min Panel fps: 45
04-09 17:41:54.542 3954-4015/com.example.joshiyogesh.eventreminderbear I/qdutils: Max Panel fps: 60
04-09 17:41:54.682 3954-3968/com.example.joshiyogesh.eventreminderbear W/art: Suspending all threads took: 7.777ms
04-09 17:41:56.732 3954-3968/com.example.joshiyogesh.eventreminderbear W/art: Suspending all threads took: 51.622ms
04-09 17:41:56.892 3954-4016/com.example.joshiyogesh.eventreminderbear W/Auth: [GoogleAuthUtil] GoogleAuthUtil
04-09 17:41:56.952 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: com.google.api.client.googleapis.extensions.android.gms.auth.UserRecoverableAuthIOException
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential$RequestHandler.intercept(GoogleAccountCredential.java:299)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:868)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.example.joshiyogesh.eventreminderbear.MainActivity$MakeRequestTask.createEvent(MainActivity.java:363)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.example.joshiyogesh.eventreminderbear.MainActivity$MakeRequestTask.doInBackground(MainActivity.java:320)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.example.joshiyogesh.eventreminderbear.MainActivity$MakeRequestTask.doInBackground(MainActivity.java:272)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at java.lang.Thread.run(Thread.java:818)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: Caused by: com.google.android.gms.auth.UserRecoverableAuthException: NeedPermission
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze$1.zzat(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze$1.zzau(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze.zza(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze.zzc(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze.getToken(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze.getToken(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.zze.getToken(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential.getToken(GoogleAccountCredential.java:269)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential$RequestHandler.intercept(GoogleAccountCredential.java:294)
04-09 17:41:56.972 3954-4016/com.example.joshiyogesh.eventreminderbear W/System.err: ... 13 more
04-09 17:41:57.282 3954-4015/com.example.joshiyogesh.eventreminderbear V/RenderScript: Application requested CPU execution
04-09 17:41:57.312 3954-4015/com.example.joshiyogesh.eventreminderbear V/RenderScript: 0x55ab5f3610 Launching thread(s), CPUs 8
04-09 17:41:57.352 3954-3954/com.example.joshiyogesh.eventreminderbear I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@3d3b858f time:55536505