如何在其他所有活动之上发起活动？

Question

I am trying to create an application that defines two activites. The first activity pretty much runs all of the time. The second activity requires the user to authenticate to use the device.

Most of the time this application works fine. However, I am having problems figuring out how to force the second activity to the top of the window stack. The code calls startActivity passing in an intent to start the second activity. The problem is that when another application is running (eg a web browser), the second activity is not on top. When the other application exits, the second activity is visible to take input from the user.

Here is the activity definition for the second activity that I want to have always on top when started:

    <activity android:name=".Authenticate"
              android:launchMode="singleTop"
              android:configChanges="orientation|keyboardHidden">
    </activity>

It is my understanding that when start activity is called, it will put the new activity on top. Is there something that I am missing? How can I make the authentication activity come to the top when it is started?

Answer 1

Well AFAIK, you cannot force your Activity to stay on top all the time. If some other process (say Web Browser) creates an Activity after you have created yours, then that processes Activity will have focus and not yours.

Answer 2

每当一个新的活动开始时，它就位于堆栈的顶部，并且如果另一个应用程序正在运行，则它将位于堆栈的顶部，如果您希望活动位于堆栈的顶部，则应该停止启动其他应用程序...是否有我想念的东西，然后让我知道。