onPerformSync
时间: 2023-10-09 07:12:18 浏览: 40
'onPerformSync' 是一个 Android 中的方法,用于执行同步操作。当调用此方法时,Android 系统会触发一个同步请求,然后应用程序可以执行所需的同步操作。通常情况下,这个方法会被用于与远程服务器同步数据或执行其他后台任务。
在使用 'onPerformSync' 方法时,你需要创建一个继承自 `AbstractThreadedSyncAdapter` 的类,并重写其中的 `onPerformSync` 方法。在这个方法中,你可以根据自己的需求执行网络请求、数据库操作或其他需要在后台进行的任务。这样可以确保应用程序的数据与服务器保持同步,并提供最新的信息给用户。
请注意,'onPerformSync' 方法在主线程之外执行,因此可以执行一些耗时的操作,但不应该执行任何可能导致阻塞的操作,以免影响应用程序的性能和响应速度。
相关问题
Android钉钉服务器CalDAV开发Demo
钉钉的CalDAV服务器是一个标准的CalDAV服务器,因此你可以使用任何支持CalDAV协议的第三方库来访问它。下面是一个使用Android系统自带的SyncAdapter框架实现的CalDAV同步Demo。
1. 添加依赖
在build.gradle文件中添加以下依赖:
```
dependencies {
implementation "com.github.aflx:sardine-android:5.7.0"
}
```
这里使用了Sardine-Android库,它是一个支持WebDAV和CalDAV协议的Android库,可以方便地与钉钉的CalDAV服务器进行交互。
2. 创建SyncAdapter
创建一个继承自AbstractThreadedSyncAdapter的SyncAdapter类,并实现其中的onPerformSync()方法,用于执行CalDAV同步任务。
```java
public class CalDAVSyncAdapter extends AbstractThreadedSyncAdapter {
private static final String TAG = "CalDAVSyncAdapter";
private final Sardine mSardine;
public CalDAVSyncAdapter(Context context, boolean autoInitialize) {
super(context, autoInitialize);
mSardine = new OkHttpSardine();
}
@Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
try {
// TODO: 执行CalDAV同步任务
} catch (Exception e) {
Log.e(TAG, "CalDAV sync failed", e);
syncResult.stats.numIoExceptions++;
}
}
}
```
3. 注册SyncAdapter
在AndroidManifest.xml文件中注册SyncAdapter,并指定对应的账户类型和CalDAV服务器地址。
```xml
<application>
<provider
android:name="android.content.ContentProvider"
android:authorities="com.android.calendar"
android:exported="false"
android:syncable="true" />
<service
android:name=".CalDAVSyncAdapterService"
android:exported="true">
<intent-filter>
<action android:name="android.content.SyncAdapter" />
</intent-filter>
<meta-data
android:name="android.content.SyncAdapter"
android:resource="@xml/caldav_sync_adapter" />
<meta-data
android:name="android.provider.CONTACTS_STRUCTURE"
android:resource="@xml/contacts" />
</service>
</application>
<uses-permission android:name="android.permission.READ_CALENDAR" />
<uses-permission android:name="android.permission.WRITE_CALENDAR" />
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="com.android.exchange"
android:icon="@drawable/icon_exchange"
android:smallIcon="@drawable/icon_exchange"
android:label="@string/app_name" />
<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
android:contentAuthority="com.android.calendar"
android:accountType="com.android.exchange"
android:userVisible="false"
android:supportsUploading="true"
android:allowParallelSyncs="false"
android:isAlwaysSyncable="true" />
```
在res/xml目录下创建caldav_sync_adapter.xml文件,指定SyncAdapter的参数。
```xml
<sync-adapter
xmlns:android="http://schemas.android.com/apk/res/android"
android:contentAuthority="com.android.calendar"
android:accountType="com.android.exchange"
android:userVisible="false"
android:supportsUploading="true"
android:allowParallelSyncs="false"
android:isAlwaysSyncable="true" />
```
4. 执行CalDAV同步任务
在SyncAdapter的onPerformSync()方法中,使用Sardine库实现CalDAV同步任务。以下是一个简单的例子,可以获取钉钉CalDAV服务器上的所有日历事件。
```java
@Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
try {
// 创建Sardine对象
mSardine.setCredentials("username", "password");
// 获取所有日历事件
List<DavResource> resources = mSardine.getResources("https://calendar.dingtalk.com/caldav/username/events/");
// 解析日历事件
for (DavResource resource : resources) {
CalendarBuilder builder = new CalendarBuilder();
Calendar calendar = builder.build(resource.getInputStream());
Log.d(TAG, "Event: " + calendar.toString());
}
} catch (Exception e) {
Log.e(TAG, "CalDAV sync failed", e);
syncResult.stats.numIoExceptions++;
}
}
```
注意:在使用Sardine库访问CalDAV服务器时,需要使用完整的CalDAV资源地址,例如"https://calendar.dingtalk.com/caldav/username/events/",其中username为钉钉账号的用户名。另外,钉钉的CalDAV服务器使用的是HTTPS协议,需要添加相应的证书验证。
Android CalDAV Demo
可以使用Android中提供的SyncAdapter框架来实现CalDAV同步,以下是一个简单的CalDAV Demo:
1. 创建SyncAdapter
```java
public class CalDavSyncAdapter extends AbstractThreadedSyncAdapter {
private final AccountManager mAccountManager;
public CalDavSyncAdapter(Context context, boolean autoInitialize) {
super(context, autoInitialize);
mAccountManager = AccountManager.get(context);
}
@Override
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
//TODO: 实现CalDAV同步逻辑
}
}
```
2. 在AndroidManifest.xml中注册SyncAdapter
```xml
<service android:name=".CalDavSyncAdapter"
android:exported="true"
android:process=":sync">
<intent-filter>
<action android:name="android.content.SyncAdapter" />
</intent-filter>
<meta-data android:name="android.content.SyncAdapter"
android:resource="@xml/syncadapter" />
</service>
```
3. 在res/xml目录下创建syncadapter.xml文件,指定SyncAdapter的属性
```xml
<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="com.example.caldav"
android:userVisible="true"
android:supportsUploading="true"
android:allowParallelSyncs="false"
android:isAlwaysSyncable="true" />
```
4. 在MainActivity中创建账户并启动同步
```java
public class MainActivity extends AppCompatActivity {
private Account mAccount;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAccount = new Account("username", "com.example.caldav");
AccountManager accountManager = AccountManager.get(this);
accountManager.addAccountExplicitly(mAccount, null, null);
ContentResolver.setIsSyncable(mAccount, "com.android.calendar", 1);
ContentResolver.setSyncAutomatically(mAccount, "com.android.calendar", true);
ContentResolver.addPeriodicSync(mAccount, "com.android.calendar", new Bundle(), 60);
}
}
```
5. 实现CalDAV同步逻辑
```java
private void syncCalendars(Account account) {
CalDavAccount calDavAccount = getCalDavAccount(account);
List<CalDavCalendar> remoteCalendars = getRemoteCalendars(calDavAccount);
List<CalDavCalendar> localCalendars = getLocalCalendars(account);
for (CalDavCalendar remoteCalendar : remoteCalendars) {
if (!localCalendars.contains(remoteCalendar)) {
createLocalCalendar(account, remoteCalendar);
} else {
updateLocalCalendar(account, remoteCalendar);
}
}
for (CalDavCalendar localCalendar : localCalendars) {
if (!remoteCalendars.contains(localCalendar)) {
deleteLocalCalendar(account, localCalendar);
}
}
}
private CalDavAccount getCalDavAccount(Account account) {
String username = account.name;
String password = AccountManager.get(this).getPassword(account);
//TODO: 创建CalDavAccount对象
}
private List<CalDavCalendar> getRemoteCalendars(CalDavAccount calDavAccount) {
//TODO: 获取远程CalDAV服务器上的日历列表
}
private List<CalDavCalendar> getLocalCalendars(Account account) {
List<CalDavCalendar> localCalendars = new ArrayList<>();
Cursor cursor = getContentResolver().query(Calendars.CONTENT_URI, null,
Calendars.ACCOUNT_NAME + " = ? AND " + Calendars.ACCOUNT_TYPE + " = ?",
new String[]{account.name, account.type}, null);
while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex(Calendars.NAME));
String displayName = cursor.getString(cursor.getColumnIndex(Calendars.CALENDAR_DISPLAY_NAME));
String description = cursor.getString(cursor.getColumnIndex(Calendars.CALENDAR_DESCRIPTION));
String timeZone = cursor.getString(cursor.getColumnIndex(Calendars.CALENDAR_TIME_ZONE));
int color = cursor.getInt(cursor.getColumnIndex(Calendars.CALENDAR_COLOR));
int accessLevel = cursor.getInt(cursor.getColumnIndex(Calendars.CALENDAR_ACCESS_LEVEL));
boolean syncEvents = cursor.getInt(cursor.getColumnIndex(Calendars.SYNC_EVENTS)) == 1;
//TODO: 创建CalDavCalendar对象并添加到localCalendars列表中
}
cursor.close();
return localCalendars;
}
private void createLocalCalendar(Account account, CalDavCalendar remoteCalendar) {
ContentValues values = new ContentValues();
values.put(Calendars.ACCOUNT_NAME, account.name);
values.put(Calendars.ACCOUNT_TYPE, account.type);
values.put(Calendars.NAME, remoteCalendar.getName());
values.put(Calendars.CALENDAR_DISPLAY_NAME, remoteCalendar.getDisplayName());
values.put(Calendars.CALENDAR_DESCRIPTION, remoteCalendar.getDescription());
values.put(Calendars.CALENDAR_TIME_ZONE, remoteCalendar.getTimeZone());
values.put(Calendars.CALENDAR_COLOR, remoteCalendar.getColor());
values.put(Calendars.CALENDAR_ACCESS_LEVEL, remoteCalendar.getAccessLevel());
values.put(Calendars.SYNC_EVENTS, 1);
getContentResolver().insert(Calendars.CONTENT_URI, values);
}
private void updateLocalCalendar(Account account, CalDavCalendar remoteCalendar) {
ContentValues values = new ContentValues();
values.put(Calendars.NAME, remoteCalendar.getName());
values.put(Calendars.CALENDAR_DISPLAY_NAME, remoteCalendar.getDisplayName());
values.put(Calendars.CALENDAR_DESCRIPTION, remoteCalendar.getDescription());
values.put(Calendars.CALENDAR_TIME_ZONE, remoteCalendar.getTimeZone());
values.put(Calendars.CALENDAR_COLOR, remoteCalendar.getColor());
values.put(Calendars.CALENDAR_ACCESS_LEVEL, remoteCalendar.getAccessLevel());
getContentResolver().update(Calendars.CONTENT_URI, values,
Calendars.ACCOUNT_NAME + " = ? AND " + Calendars.ACCOUNT_TYPE + " = ?" +
" AND " + Calendars.NAME + " = ?",
new String[]{account.name, account.type, remoteCalendar.getName()});
}
private void deleteLocalCalendar(Account account, CalDavCalendar localCalendar) {
getContentResolver().delete(Calendars.CONTENT_URI,
Calendars.ACCOUNT_NAME + " = ? AND " + Calendars.ACCOUNT_TYPE + " = ?" +
" AND " + Calendars.NAME + " = ?",
new String[]{account.name, account.type, localCalendar.getName()});
}
```