Android：清除後臺堆棧

本文翻譯自：Android: Clear the back stack

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

In A, I use this code to open B: 在A中，我使用此代碼打開B：

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

In B, I use this code to open C: 在B中，我使用此代碼打開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). 當用戶點擊C中的按鈕時，我想返回A並清除後棧（關閉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，當用戶使用後退按鈕B和C不會出現時，我一直在嘗試以下方法：

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? 但是當我回到活動A時，如果我使用後退按鈕，B和C仍然會出現。我怎麼能避免這種情況？

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#1樓

參考：https://stackoom.com/question/OJPm/Android-清除後臺堆棧

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#2樓

As per Wakka in Removing an activity from the history stack ... 根據Wakka 從歷史堆棧中刪除活動 ...

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

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

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#3樓

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

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#4樓

The given code works correctly. 給定的代碼正常工作。 I have tried in the Application Life Cycle sample. 我已嘗試過Application Life Cycle樣本。

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啓動活動A之後，我沒有在後臺堆棧中獲得B和C.

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#5樓

Try using 嘗試使用

intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

and not 並不是

intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

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#6樓

Starting in API 16 (Jelly Bean), you can just call finishAffinity() . 從API 16（Jelly Bean）開始，您可以調用finishAffinity() 。

Now you can also call ActivityCompat.finishAffinity(Activity activity) with the compatibility library. 現在，您還可以使用兼容性庫調用ActivityCompat.finishAffinity(Activity activity) 。

Be sure to set taskAffinity in the manifest to a package name unique to that group of activities. 確保將清單中的taskAffinity設置爲該組活動所特有的包名稱。

See for more info: 查看更多信息：
http://developer.android.com/reference/android/support/v4/app/ActivityCompat.html#finishAffinity%28android.app.Activity%29 http://developer.android.com/reference/android/support/v4/app/ActivityCompat.html#finishAffinity%28android.app.Activity%29