如何知道什么时候同步完成？ [英] How to know when sync is finished?

问题描述

我实现了一个同步适配器，我想，当它完成我的活动来获得一个回调。我曾试过用<一个href="http://developer.android.com/reference/android/content/ContentResolver.html#addStatusChangeListener%28int,%20android.content.SyncStatusObserver%29"><$c$c>ContentResolver.addStatusChangeListener,但我只得到回调时同步挂起/主动。下面是我的活动有一定相关code：

I have implemented a sync adapter and I want to get a callback when it finishes in my activity. I have tried using ContentResolver.addStatusChangeListener, but I am only getting callbacks when the sync is pending / active. Here's some relevant code from my activity:

@Override
protected void onResume() {
    super.onResume();
    final int mask = ContentResolver.SYNC_OBSERVER_TYPE_ACTIVE | ContentResolver.SYNC_OBSERVER_TYPE_PENDING;
    syncObserverHandle = ContentResolver.addStatusChangeListener(mask, syncStatusObserver);
}

@Override
protected void onPause() {
    super.onPause();
    if (syncObserverHandle != null) {
        ContentResolver.removeStatusChangeListener(syncObserverHandle);
        syncObserverHandle = null;
    }
}

private SyncStatusObserver syncStatusObserver = new SyncStatusObserver() {

    @Override
    public void onStatusChanged(int which) {
        AccountManager am = AccountManager.get(TodosActivity.this);
        Account a = am.getAccountsByType(Const.ACCOUNT_TYPE)[0];

        Log.d(Const.TAG, "Sync status changed: " + which);

        if (!ContentResolver.isSyncActive(a, DataProvider.AUTHORITY) &&
                !ContentResolver.isSyncPending(a, DataProvider.AUTHORITY)) {
            Log.d(Const.TAG, "Sync finished, should refresh nao!!");
        }
    }
};

不过，如果在 onStatusChanged 的方法是永远有效的。我已经采取了这个例子从<一个href="http://$c$c.google.com/p/jumpnote/source/browse/trunk/JumpNoteAndroid/src/com/example/jumpnote/android/NotesList.java#266">JumpNote演示它的工作原理可能是因为它是手动 onResume（），因此它可能是从来没有所谓的由系统的时候也被称为同步完成。或者是它，我做错了什么？下面是我得到的logcat：

However, the if in the onStatusChanged method is never valid. I have taken this example from the JumpNote demo where it works probably because it is also called manually in onResume(), so it's probably never called by the system when the sync is finished. Or is it, and I'm doing something wrong? Here's what I get in logcat:

D/MYAPP (10903): Sync status changed: 2
D/MYAPP (10903): Sync status changed: 2
D/MYAPP (10903): Sync status changed: 4
D/MYAPP (10981): --> DataSyncAdapter.onPerformSync()
D/MYAPP (10981): <-- DataSyncAdapter.onPerformSync()
D/MYAPP (10903): Sync status changed: 4

所以，看来我的可以的依靠第二 SYNC_OBSERVER_TYPE_ACTIVE （4）状态改变刷新我的数据，但似乎<强>真的难看。任何想法？

So, it seems that I could rely on the second SYNC_OBSERVER_TYPE_ACTIVE (4) status change to refresh my data, but that seems really ugly. Any ideas?

推荐答案

我已经找到一种解决方案是沟 ContentResolver的完全，并实现自己的广播。基本上，在同步适配器添加此，在年底 onPerformSync ：

One solution that I have found is to ditch the ContentResolver completely, and implement my own broadcast. Basically, add this in the sync adapter, at the end of onPerformSync:

Intent i = new Intent(SYNC_FINISHED);
sendBroadcast(i);

这在活动：

@Override
protected void onResume() {
    super.onResume();
    registerReceiver(syncFinishedReceiver, new IntentFilter(DataSyncService.SYNC_FINISHED));
}

@Override
protected void onPause() {
    super.onPause();
    unregisterReceiver(syncFinishedReceiver);
}

private BroadcastReceiver syncFinishedReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(Const.TAG, "Sync finished, should refresh nao!!");
    }
};

这似乎工作得很好，但我希望能找到一些在SDK时，同步完成后直接通知我。

This seems to work just fine, however I was hoping to find something in the SDK that directly notify me when a sync is finished.

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