如何从 singleInstance 活动启动活动？
我有一个小部件，单击时可以弹出小对话框。这些对话框由名为 RemoteActivity 的活动以 singleInstance launchMode 显示。在其中一个对话框中，有一个按钮用于启动主应用程序 MainActivity，它具有标准的 launchMode。
但是，当单击此按钮并调用 startActivity() 时，尽管我可以在 logcat 中看到相应的“正在启动活动：Intent { ... }”，但 MainActivity 并未启动。
如果我将 RemoteActivity 的 launchMode 设置为标准，那么 MainActivity 就会启动，但这不是我想要的，RemoteActivity 只是小部件的扩展，我不希望它与任何其他活动堆栈。
我也尝试过 FLAG_ACTIVITY_NEW_TASK 但它没有帮助，而且无论如何也没有必要 根据文档：
“singleInstance”活动，在 另一方面，不允许其他 活动作为其任务的一部分。 这是任务中唯一的活动。如果 它开始另一个活动，即 活动被分配给不同的 任务 — 就像 FLAG_ACTIVITY_NEW_TASK 是在意图中。
我如何启动我的主要活动？
更新/勘误：
MainActivity 实际上已启动，但前提是它还不是任务的一部分。如果我通过启动器正常启动 MainActivity，然后按“返回”退出，则 RemoteActivity 会启动 MainActivity。
但是，如果我不按 Back，而是按 Home 离开 MainActivity，则 RemoteActivity 无法启动 MainActivity，尽管意图出现在 logcat 中。
我正在 Froyo 上测试这个。
知道发生了什么吗？
I have a widget which can pop up small dialogs when clicked. These dialogs are displayed by an activity called RemoteActivity in singleInstance launchMode. In one of these dialogs, there is a button to launch the main app MainActivity, which has the standard launchMode.
However, when this button is clicked, and startActivity() called, MainActivity isn't launched, although I can see the corresponding "Starting activity: Intent { ... }" in logcat.
If I set the launchMode of RemoteActivity to standard then MainActivity gets launched, but this isn't what I want, RemoteActivity is merely an extension of the widget, I don't want it to stack with any other activity.
I also tried with FLAG_ACTIVITY_NEW_TASK but it didn't help, and it shouldn't be necessary anyway according to the docs:
A "singleInstance" activity, on the
other hand, permits no other
activities to be part of its task.
It's the only activity in the task. If
it starts another activity, that
activity is assigned to a different
task — as if FLAG_ACTIVITY_NEW_TASK
was in the intent.
How can I launch my main activity?
UPDATE / ERRATA:
The MainActivity is actually launched but only if it isn't already part of a task. If I launch MainActivity normally through the launcher, and press Back to exit, then RemoteActivity does launch MainActivity.
But if, instead of pressing Back, I press Home to leave MainActivity, then RemoteActivity can't launch MainActivity, although the intent appears in logcat.
I'm testing this on Froyo.
Any idea of what's happening?
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也许 noHistory 标志 适合您正在寻找的内容为了？
Maybe the noHistory flag will work for what you are looking for?
我发现问题：只有在 RemoteActivity 中的 startActivity() 之前调用 finish() 时，才会出现此行为。如果我在 finish() 之前调用 startActivity() ，那么无论 MainActivity 是否已经是现有任务的一部分，它都可以正常工作。
去算算...
I found the problem: this behavior only occurs when calling finish() before startActivity() in RemoteActivity. If I call startActivity() before finish() then it works fine whether MainActivity is already part of an existing task or not.
Go figure...