开始新活动时完成2个活动

Question

I have 4 activities: ABCD When starting the activity D from C, B and C should be removed from the stack. So, the sequence is like: A > B > C > D then D > A What I've tried doing when starting D from C is:

//create new Intent(C,D)
//setflags Intent.FLAG_ACTIVITY_CLEAR_TOP
//startActivity
//finish C

When onBackPressed is called in D, activity B is displayed. Seems like it didn't finish. And when checking the stack of activities in Layout Inspector I can see AB D. What do I do to remove B from stack upon calling D or upon onBackPressed of D? Note that I need B when C is started that's why I didn't try calling finish() when starting C. Thanks in advance

Answer 1

How about loading A Activity from D Activity.

Intent intent = new Intent(getBaseContext(), A.class);
startActivity(intent); 

Answer 2

One way to achieve this is when you press back on the activity D, you simply start your activity A with the flag FLAG_ACTIVITY_CLEAR_TOP . This will bring the already existing activity A to the front and clear all other activities.

@Override
void onBackPressed() {
     Intent intent = new Intent(this, A.class);
     intent.setFlags(FLAG_ACTIVITY_CLEAR_TOP);
     startActivity(intent);
}

Note: This will also clear the activity D from the stack so you won't be able to press back and go to the activity D.

Answer 3

只需使用：

startActivity(new Intent(this, A.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK));