我有在一个Android应用程序我工作的一个小问题：

I have got a small problem in an Android app I am working on :

有3项活动，即A，B，C和调用是按以下顺序： A - > B - > C。而在C，当我preSS BACK按钮，它应该回到A [对B，而不是默认。而pressing回来会退出程序。

There are 3 activities namely A , B , C and the invocation is in the following order : A -> B -> C. While in C, when I press BACK button, it should go back to A[Instead of the B by default]. And pressing BACK in A will exit the program.

我试图调用一个意图从C到A.但是，在这种情况下，呼叫调用进入一个循环： A - > B - >ç - >答：由于新的活动被压入堆栈的顶部。这样一来，当背部pssed，而不是退出[A是一开始]在A，$ P $，它会为C，然后B，然后回到A中不必要的圈子。

I tried to call an intent from C to A. But in this case the call invocation gets into a loop : A -> B -> C -> A since the new activity is pushed on top of the stack. As a result, when BACK is pressed at A, instead of exiting [A is the start], it goes to C and then B and then back to A in a needless circle.

这将是巨大的，如果有人能够给出一个更好的办法来解决这个糊涂的情况下！

It would be great if someone could give a better way to address this loopy scenario!

推荐答案

很简单！ 当你开始活动C，从B，使用B.finish（）。事情是这样的。

Very simple!! When you are starting the activity C, from B, use B.finish(). Something like this.

Intent i = new Intent(B.this, C.class);
B.this.finish();
startActivity(i);

这会从栈中删除乙！