我有两个活动。我有一个活动，我需要获取 facebook 朋友数据、他们的事件，并将所有这些数据保存到数据库中，然后显示一个包含特定信息的页面，但这一切都需要很多时间。所以在做这一切之前，我将一个意图转移到另一个活动中，所以活动#1 在后台创建解析器并将其保存在数据库中。但是现在我需要在所有计算完成后通知我的 Activity #2，以便我也可以启用一些 UI 按钮来显示现在存储在数据库中的数据。
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If you really need both of those Activities (because you don't need Activity#1 if it's only task is to download data), then AsyncTask will be no good, since it's designed to be attached to a specific Activity.
What you'd rather do is to start a Service (with AsyncTask in it or even better, an IntentService). When it finishes its job you could do something like this:
Intent finish = new Intent(com.mypackage.intent.ACTION_DOWNLOADCOMPLETE);
sendBroadcast(finish);
And in your Activity#2 listen to this broadcast with BroadcastReceiver.
于 2012-09-21T07:55:10.030 回答