我一直在开发 Android Native App，我想做的是:

I been working on Android Native App , What i was trying to do is :

Activities - A -> B -> C  Then  A-> B -> C -> C  . 

如果 C Activity 再次指向 C，那么我想手动从堆栈中删除 C、B.在我的背上，它应该只移动到 A .

From C Activity if it again point to C then i want to remove C , B from stack manually . On my back it should move only to A .

我试过finish()，但问题是:

I tried finish() but problem is :

Activities - A -> B ->  C  Then  A-> B -> C -> C  on finish A -> B -> C  required state A-> C .

有谁知道如何捕获堆栈中的所有活动并从堆栈中删除特定活动??

Is anyone know how to catch all activities in stack and remove specific activities from stack ??

推荐答案

在 Activity C 中，重写 onBackPressed 并添加如下内容:

In Activity C, override onBackPressed and add in something like:

@Override
public void onBackPressed() {
    if (shouldGoBackToA) {  // There are various ways this could be set
        Intent intent = new Intent(this, AActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
    } else {
        finish();
    }
}

FLAG_ACTIVITY_CLEAR_TOP 将导致它沿堆栈向下移动到 A Activity 的现有副本，而不是启动一个新副本.来自文档:

FLAG_ACTIVITY_CLEAR_TOP will cause it to go down the stack to the existing copy of A Activity instead of starting a new one. From the docs:

public static final int FLAG_ACTIVITY_CLEAR_TOP如果设置，并且正在启动的活动已经在当前任务中运行，那么不会启动该活动的新实例，而是关闭它上面的所有其他活动，并且此 Intent 将被传递到(现在顶部)作为新意图的旧活动.

public static final int FLAG_ACTIVITY_CLEAR_TOP If set, and the activity being launched is already running in the current task, then instead of launching a new instance of that activity, all of the other activities on top of it will be closed and this Intent will be delivered to the (now on top) old activity as a new Intent.