为什么CalendarProvider不允许写入ExtendedProperties？ [英] Why CalendarProvider doesn't allow writting ExtendedProperties?

问题描述

Google日历活动有扩展属性，可用于将名称/值对附加到事件。

Google calendar events have extended properties that can be used to attach name/value pairs to an event.

我们正在实施一个协作日历应用程序，使用这些扩展属性向事件附加额外信息。根据Google的建议，我们使用Android CalendarProvider读取和创建新活动。当我们创建一个新的事件，我们需要添加一些扩展属性，但我们只是意识到日历提供程序不允许写 CalendarContract.ExtendedProperties ，如果我们尝试我们得到以下错误：

We are implementing a collaborative calendar application that uses those extended properties to attach extra information to the event. As recommended by Google, we use the Android CalendarProvider to read and create new events. When we create a new event we need to add some extended properties to it but we just realised that the calendar provider doesn't allow writting CalendarContract.ExtendedProperties, if we try we get the following error:

只有同步适配器可以使用内容写入：//com.android.calendar/extendedproperties

这些属性在CalendarProvider中是只读的，这看起来有点奇怪，因为它违反了它们的整个目的，即能够为事件附加一些额外的元数据。

It seems a bit weird that these properties are read-only in the CalendarProvider because it defeats the whole purpose of them that is being able to attach some extra metadata to the event.

有没有人知道这种限制的解决方法？

Does anyone know a workaround for this limitation?

推荐答案

您必须按照以下步骤操作：

you have to proceed as below :

• 用于保存扩展属性事件的类应该
  扩展 AbstractThreadedSyncAdapter ，然后实现 onPerfomSync（...） / p>
  
  

• the class you use for saving events with extended propeties should extends AbstractThreadedSyncAdapter , then implements the method onPerfomSync(...)

public void onPerformSync(Account account, Bundle extras, String authority,
    ContentProviderClient provider, SyncResult syncResult) {
System.out.println("Sync......");
saveEvent();//your saving events method... 

}

在同一个类别中添加以下方法：

add the method below in the same class :

    static Uri asSyncAdapter(Uri uri, String account, String accountType) {
    return uri.buildUpon()
        .appendQueryParameter(android.provider.CalendarContract.CALLER_IS_SYNCADAPTER,"true")
        .appendQueryParameter(Calendars.ACCOUNT_NAME, account)
        .appendQueryParameter(Calendars.ACCOUNT_TYPE, accountType).build();
 }

创建一个扩展服务

public class SyncService extends Service {
private static final String TAG = "SyncService";

private static final Object sSyncAdapterLock = new Object();
private static EditEventHelper sSyncAdapter = null;

/**
 * Thread-safe constructor, creates static {@link SyncAdapter} instance.
 */
@Override
public void onCreate() {
    super.onCreate();
    Log.i(TAG, "Service created");
    synchronized (sSyncAdapterLock) {
        if (sSyncAdapter == null) {
            sSyncAdapter = new EditEventHelper(getApplicationContext());

        }
    }
}

@Override
/**
 * Logging-only destructor.
 */
public void onDestroy() {
    super.onDestroy();
    Log.i(TAG, "Service destroyed");
}

/**
 * Return Binder handle for IPC communication with {@link SyncAdapter}.
 *
 * <p>New sync requests will be sent directly to the SyncAdapter using this channel.
 *
 * @param intent Calling intent
 * @return Binder handle for {@link SyncAdapter}
 */
@Override
public IBinder onBind(Intent intent) {
    return sSyncAdapter.getSyncAdapterBinder();
}

}

在 res 路径中创建一个xml文件 syncadpater.xml ，内容如下：

In the res path create an xml file syncadpater.xml with the content :

<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
          android:contentAuthority="com.android.calendar"
          android:accountType="com.android.google"
          android:userVisible="true"
          android:supportsUploading="false"
          android:allowParallelSyncs="false"
          android:isAlwaysSyncable="false"
    />

用于向您的活动添加Extendedproperties的代码为：

The code for used for adding an Extendedproperties to you event, will be :

ContentValues customerContentValues_1 = new ContentValues(); 
        customerContentValues_1.put(ExtendedProperties.EVENT_ID, model.mId);
        customerContentValues_1.put(ExtendedProperties.NAME, "name");
        customerContentValues_1.put(ExtendedProperties.VALUE, value);
activity.getContentResolver().insert(asSyncAdapter(ExtendedProperties.CONTENT_URI, mOwnerAccount, ACCOUNT_TYPE), customerContentValues_1);

在 AndroidManifest.xml 文件中添加以下权限：

In the AndroidManifest.xml file add these permissions :

    <uses-permission android:name="android.permission.READ_SYNC_STATS" />
<!-- Required to enable our SyncAdapter after it's created. -->
<uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />
<!-- Required because we're manually creating a new account. -->
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />

然后将已创建的服务声明到与syncadapter.xml文件关联的清单文件中：

Then declare the Service that you've create into the manifest file associated to the syncadapter.xml file:

        <service
        android:name="com.android.calendar.iselection.event.SyncService"
        android:exported="true" >

        <!--
        This intent filter is required. It allows the system to launch our sync service
        as needed.
        -->
        <intent-filter>
            <action android:name="android.content.SyncAdapter" />
        </intent-filter>
        <!-- This points to a required XML file which describes our SyncAdapter. -->
        <meta-data
            android:name="android.content.SyncAdapter"
            android:resource="@xml/syncadapter" />
    </service>

祝你好运！

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