Android SyncAdapter 陷入无限同步循环

Question

我正在编写一个 Android 同步适配器，基本上在无限循环中同步时遇到问题。同步完成后，一切都会重新开始。

谢谢你，

问候，

阿克谢

@Override
    public void onPerformSync(final Account account, final Bundle extras, final String authority, final ContentProviderClient provider, final SyncResult syncResult) {
        Log.i("Sync result full sync = " + syncResult.fullSyncRequested);
        Log.i("Sync result " + syncResult.toDebugString());
        Log.i("Bundle " + extras.toString());

        final CountDownLatch latch = new CountDownLatch(3);


        final CachedDataReceiver globalStreamRefreshReciever = new CachedDataReceiver(null) {
            @Override
            protected void onComplete(int resultCode) {latch.countDown();}
            @Override
            protected void onError() {latch.countDown();}
        };

        final CachedDataReceiver newMessagesReciever = new CachedDataReceiver(null) {
            @Override
            protected void onComplete(int resultCode) {latch.countDown();}
            @Override
            protected void onError() {latch.countDown();}
        };

        final CachedDataReceiver getViewedMessagesReciever = new CachedDataReceiver(null) {
            @Override
            protected void onComplete(int resultCode) {latch.countDown();showAnyNewInboxItemAlerts(getApplicationContext());}
            @Override
            protected void onError() {latch.countDown();}
        };


        /*long currentTime = System.currentTimeMillis();
        long netTime = currentTime-getLastSyncTimeStamp();
        boolean shouldSync = (netTime - getSyncInterval()) >=0;
        if (!shouldSync && getSyncInterval()!=Constants.INVALID_ITEM){
            Log.i("Current time = " + currentTime + " last sync = " + getLastSyncTimeStamp() + " sync interval = " + getSyncInterval());
            Log.i("Difference = " + (netTime - getSyncInterval()));
            return;
        }*/



        if (user.isUserLoggedIn() && (!TextUtils.isEmpty(user.peekLoggedInUserAccountToken(null)))){ 
            startService(api.getGlobalStream(0,10,globalStreamRefreshReciever));
            startService(api.getNewMessagesInbox(newMessagesReciever));
            startService(api.getViewedMessagesInbox(false, getViewedMessagesReciever));
            addTimeStamp(); 
            Log.i("in sync");
            try {
                latch.await(1, TimeUnit.MINUTES);
            } catch (InterruptedException interruptedException) {
                interruptedException.printStackTrace();
                Log.e("Error in latch while sync ");
            }

        }
    }

Answer 1

你在那里丢失了很多代码，当你不告诉我们你在做什么时很难找到你的问题。

大胆猜测您的问题...

addTimeStamp() 或您创建的各种服务是否会修改 ContentProvider 中存储的数据？

如果是这样，您的 ContentProvider 是否调用 ContentResolver.notifyChange(uri, null)？

如果是这样，您的 ContentProvider 会通知 Android 它已更改并需要同步，从而驱动循环。

API 是 notifyChange (Uri uri, ContentObserverobserver, booleansyncToNetwork)。您需要使用 notifyChange(uri, null, false); 进行调用 - 这表明您已从网络中提取更改，并且不应将其推回网络，从而破坏环形。

Answer 2

当我们注册了ContentObserver时，即使将syncToNetwork设置为false，同步适配器也会进入循环。

notifyChange(uri, null, false);