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android - 如何清除活动堆栈并仅启动一项活动？

问题描述

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)

并尝试过

addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)

这个我也加了。

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

如您所见，它只清除了最旧的一个。我怎样才能清楚地清除backstack？

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

标签： androidandroid-intentandroid-activitymanager

解决方案

实际上，我的代码没有任何问题。但是我设置singleInstance了那个活动，所以它没有用。

因为 singleInstance 似乎优先级更高，所以它不会被 singleTask(NEW_TASK+CLEAR_TASK or CLEAR_TOP) 覆盖

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