Android：清除后台堆栈

本文翻译自：Android: Clear the back stack

In Android I have some activities, let's say A, B, C. 在Android中我有一些活动，比方说A，B，C。

In A, I use this code to open B: 在A中，我使用此代码打开B：

Intent intent = new Intent(this, B.class); startActivity(intent);

In B, I use this code to open C: 在B中，我使用此代码打开C：

Intent intent = new Intent(this, C.class); startActivity(intent);

When the user taps a button in C, I want to go back to A and clear the back stack (close both B and C). 当用户点击C中的按钮时，我想返回A并清除后栈（关闭B和C）。 So when the user use the back button B and C will not show up, I've been trying the following: 因此，当用户使用后退按钮B和C不会出现时，我一直在尝试以下方法：

Intent intent = new Intent(this, A.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent);

But B and C are still showing up if I use the back button when I'm back in activity A. How can I avoid this? 但是当我回到活动A时，如果我使用后退按钮，B和C仍然会出现。我怎么能避免这种情况？

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#1楼

参考：https://stackoom.com/question/OJPm/Android-清除后台堆栈

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#2楼

As per Wakka in Removing an activity from the history stack ... 根据Wakka 从历史堆栈中删除活动 ...

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Add android:noHistory="true" attribute to your <activity> in the AndroidManifest.xml like this: 将android:noHistory="true"属性添加到AndroidManifest.xml中的<activity> ，如下所示：

<activity android:name=".MyActivity" android:noHistory="true"> </activity>

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#3楼

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); startActivity(intent);

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#4楼

The given code works correctly. 给定的代码正常工作。 I have tried in the Application Life Cycle sample. 我已尝试过Application Life Cycle样本。

I haven't got B and C in the back stack after starting activity A with flag, FLAG_ACTIVITY_CLEAR_TOP 在使用flag，FLAG_ACTIVITY_CLEAR_TOP启动活动A之后，我没有在后台堆栈中获得B和C.

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#5楼

Try using 尝试使用

intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

and not 并不是

intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

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#6楼

Starting in API 16 (Jelly Bean), you can just call finishAffinity() . 从API 16（Jelly Bean）开始，您可以调用finishAffinity() 。

Now you can also call ActivityCompat.finishAffinity(Activity activity) with the compatibility library. 现在，您还可以使用兼容性库调用ActivityCompat.finishAffinity(Activity activity) 。

Be sure to set taskAffinity in the manifest to a package name unique to that group of activities. 确保将清单中的taskAffinity设置为该组活动所特有的包名称。

See for more info: 查看更多信息： http://developer.android.com/reference/android/support/v4/app/ActivityCompat.html#finishAffinity(android.app.Activity) http://developer.android.com/reference/android/support/v4/app/ActivityCompat.html#finishAffinity(android.app.Activity)