如何清除活动堆栈并只启动一个活动？

Question

我使用这些标志启动了下一个活动，以清除后台堆栈。

addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)

并且还尝试使用

addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)

我也添加了这个。

addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)

但是所有的结果都是这样的。

D/activity-stack: idx: 0
     num: 1, base-name: com.example.ui.result.ResultActivity, top-name: com.example.ui.result.ResultActivity
D/activity-stack: idx: 1
     num: 1, base-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity, top-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity
D/activity-stack: idx: 0
     num: 1, base-name: com.example.ui.result.OrderActivity, top-name: com.example.ui.result.OrderActivity
D/activity-stack: idx: 1
     num: 1, base-name: com.example.ui.result.ResultActivity, top-name: com.example.ui.result.ResultActivity
D/activity-stack: idx: 2
     num: 1, base-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity, top-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity
D/activity-stack: idx: 0
     num: 1, base-name: com.example.ui.result.PaymentActivity, top-name: com.example.ui.result.PaymentActivity
D/activity-stack: idx: 1
     num: 1, base-name: com.example.ui.result.OrderActivity, top-name: com.example.ui.result.OrderActivity
D/activity-stack: idx: 2
     num: 1, base-name: com.example.ui.result.ResultActivity, top-name: com.example.ui.result.ResultActivity
D/activity-stack: idx: 3
     num: 1, base-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity, top-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity
D/activity-stack: idx: 0
     num: 1, base-name: com.example.ui.result.CompleteActivity, top-name: com.example.ui.result.CompleteActivity
D/activity-stack: idx: 1
     num: 1, base-name: com.example.ui.result.OrderActivity, top-name: com.example.ui.result.OrderActivity
D/activity-stack: idx: 2
     num: 1, base-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity, top-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity

如你所见，它只清除了最旧的一个。如何才能清楚地清除后台堆栈？

我期望的是：

D/activity-stack: idx: 0
     num: 1, base-name: com.example.ui.result.Completectivity, top-name: com.example.ui.result.CompleteActivity
D/activity-stack: idx: 1
     num: 1, base-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity, top-name: com.google.android.apps.nexuslauncher.NexusLauncherActivity

Answer 1

实际上，我的代码没有任何错误。但我将singleInstance设置为该活动，因此它不起作用。

因为singleInstance似乎具有更高的优先级，所以它不会被singleTask(NEW_TASK+CLEAR_TASK或CLEAR_TOP)覆盖