Android-动画化以编程方式添加到布局的视图

Question

I am creating a couple of TextViews programmatically and adding to a Linear Layout.Everything works fine.

Now I want to add some animations on the TextViews. After adding the textviews I am trying to add animations on them using the ViewPropertyAnimator. But I don't see any animations. If I add them in the xml for testing, it works fine.

I found some thing like we need to add an event for when the textview is attached to the screen and code the animation here. But I have a set of animations to be run on each TextView and after it is done I need to start animations on the other.

Any ideas or pointers how I can achieve this?

My code is some thing like,

-- Create the TextViews(invisible) in a loop and add them to the layout.
-- After the above step trying to animate like below each of the text views one by one. I need to chain as I need to fade in one by one.

        tv1.setVisibility(View.VISIBLE);
        tv1.animate().alpha(1).setDuration(500);

But the animations are not working.

Thanks for any help.

Answer 1

The ViewPropertyAnimator animates properties from their current value to a specified value. Since the alpha of newly instantiated Views is 1, your animation will animate alpha from 1 to 1. You should first set the alpha to 0 rather than setting the visibility:

tv1.setAlpha(0);
tv1.animate().alpha(1).setDuration(500);

Answer 2

将此添加到您包含的视图组android:animateLayoutChanges="true"并在此处http://developer.android.com/reference/android/animation/LayoutTransition.html上查看LayoutTransition类