Question

我的问题是假设我们有4个活动。

A-＆GT; B-＆GT; C-＆GT; d

。在Activity C中，我传递了一个意图转到D，然后从D再次回到C.在从C中获取D所需的结果后，我运行异步任务，之后我必须回到B.Now我BackPress在B而不是A，活动变为

B-＆GT; C-＆GT; B-＆GT; A

这肯定是一个重复的问题，但我没有得到我的问题的正确答案。

Answer 1

Store this context of activities B,C,D in a static variable like this

Activity C

private static C cContext; 
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_c);
        cContext=this;
}

Do same thing on Activity D also and in Activity B

private static B bContext; 
     @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_b);
            clearAllTasks();
            bContext=this;
    }
 private void clearAllTasks() {
        if(D.dContext!=null)
            D.dContext.finish();
        if(C.cContext!=null)
            C.cContext.finish();
        if(B.bContext!=null)
            B.bContext.finish();
    }

Like this you can clear your backstack.From Activity B it will finish all other activies.

If you are coming to Activity B without calling intent from Activity C or D you can call clearAllTasks(); in onResume().

维护活动之间的后台堆栈

1 个答案: