Question

I have application with main activity and some more. On each other activity there is the logo of the application. When user presses the logo button, I want to get back to the main activity.

我不想创造新的意图,因为活动已经进入活动堆放。

How can I get it - use the one on the stack? How can I clear the whole activity stack, so back button will actually exit from the application instead of getting back to the previous activity?

约亚

Answer 1

我不想创造新的意图,因为活动已经进入活动堆放。

如果您启动一项活动( 通过意图或其他方式), 并且该活动已经启动, 并且正在堆叠中。然后, Android 将同样的活动实例放入堆叠的顶端。新的实例不会创建。当然, 如果您没有手动杀死该活动( 在堆叠中呼叫 < code> finish () ) ), 就会发生这种情况。

我怎样才能清除整个活动堆叠, 所以后按钮实际上会退出应用程序, 而不是回到上一个活动?

Its not recommended to override the back button to quit the application in every activity(Unless your app has strong reasons to do so). generally the app should let the user go back to the previous activity when he presses the back button (which is what a user might be expecting).
If you still would like to quit with the back button then you can override the back button function and launch the intent that leads to the home screen:

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

Answer 2

我面临一个类似的问题。

> 清点活动堆叠,只有一个报刊

Answer 3

Its very simple. Don t call finish() on Home/Main activity. For Ex: Say you have 4 activities.. If your requirement is like this .. Act1-->Act2-->Act3-->Act4-->Act1 . So, don t call finish() on Act1. But call finish() on Act2, Act3 while you are going to other activity. So when you click on logo in Act4, just call finish(). So, automatically you will come back to Act1 which is your Main activity.
If you have logo in Act2, Act3 also then call finish() on click of logo to go back to Main. But remember to call finish() on Act2 while you are going from Act2 to Act3

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