overridePendingTransition和FLAG_ACTIVITY_REORDER_TO_FRONT同时使用时，没有Activity启动动画

转自： http://stackoverflow.com/questions/4633543/overridependingtransition-does-not-work-when-flag-activity-reorder-to-front-is-u

I have two activities in the stack, in order to show them I use FLAG_ACTIVITY_REORDER_TO_FRONT. So far so good, the problem comes when I want to bring the activity with an animation using overridePendingTransition.

Intent i = new Intent(ActivityA.this, ActivityB.class);i.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); ActivityA.this.startActivity(i);overridePendingTransition(R.anim.transition_to_right, R.anim.transition_to_left);

The transition is not shown, however, if the flag is not added to the intent (removing line 2) then there is no problem.

Is it possible to bring an activity to front with an animation?

*******************解决方案一******************

I ran into this same problem. The trick is to override the transition in the onResume() callback. 

@Overridepublic void onResume() {    super.onResume();    overridePendingTransition(R.anim.transition_to_right, R.anim.transition_to_left);}

*******************解决方案二 ******************

Actually the right solution when using REORDER_TO_FRONT is to call overridePendingTransition in the method onNewIntent() of the activity you are going to open.

@Overrideprotected void onNewIntent(Intent intent) {    super.onNewIntent(intent);    overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);}

replace with your transitions.

If you need to selectively replace the transition you can add an extra in your intent and check it in the onNewIntent() to decide what to do.

This is not suitable if you don't know the transition that will be opened (if you don't specify it explicitly for example) but otherwise is the right solution.