activity切换时的overridePendingTransition动画效果 淡入淡出效果 overridePendingTransition(R.anim.fade, R.anim.hold); 放大淡出效果 overridePendingTransition(R.anim.my_scale_action,R.anim.my_alpha_action); 转动淡出效果 overridePendingTransition(R.anim.scale_rotate,R.anim.my_alpha_action); 转动淡出效果 overridePendingTransition(R.anim