扩大与动画ListView项 [英] Expand ListView item with animation

问题描述

我有一个的ListView 。最初，的ListView 包含了一些数据。当用户点击在项目上，另一布局将被动态地添加到该项目，所以它的高度会增加。

I have a ListView. Initially, the ListView contains some data. When the user clicks on an item, another layout will be dynamically added to that item so it's height will be increased.

目前，在该项目的高度增加，这显示了修改后的项目迅速。然而，我想要的是这是动画所以它逐渐增加项目的高度。

Right now, when the item's height is increased, it shows the modified item instantly. However, what I want is for this to be animated so it increases the item's height gradually.

推荐答案

我觉得我一直在寻找一样被问，我一直在寻找一种方式来制作动画列表视图项目的不断扩大，但一些新的内容显示（我只是改变从去VISABLE）的一些看法的知名度。我曾用mirroredAbstraction的答案，帮我申请一个翻译的动画（我不想一个旋转的动画）：

I think I was looking for the same as was asked, I was looking for a way to animate the expanding of the listview item as some new content is shown (I was just changing the visibility on some views from GONE to VISABLE). I had used the answer by mirroredAbstraction to help me apply a translate animation (I didn't want a rotate animation):

<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator"
android:fromYDelta="0"
android:toYDelta="-100%p"
android:duration="500"   

/>

到每个意见。它创建一个很好的效果，但密切关注，该ListView项实际上是突然扩大到将需要整个大小，那么动画下降的看法到位。但我想要的是列表视图项的影响日益下降的观点进入的知名度。

to each of the views. It create a nice effect, but looking closely, the listview item was actually suddenly expanding to the entire size that would be needed, then the animation dropped the views into place. But what I wanted was the effect of the listview item growing down as the views come into visibility.

我发现正是我一直在寻找在这里： <一href="http://udinic.word$p$pss.com/2011/09/03/expanding-listview-items/">expanding-listview-items

I found exactly what I was looking for here: expanding-listview-items

该博客有一个链接到自己的github上的样品，在这里： <一href="https://github.com/Udinic/SmallExamples/tree/master/ExpandAnimationExample">ExpandAnimationExample

The blogger has a link to his github sample, here: ExpandAnimationExample

如果你发现这些网站消失了，请告诉我，我会让我的副本可用。

If you find these sites gone, please inform me and I will make my copy available.

他把阴性切缘上的内容接触到的知名度，并设置能见度GONE：

he put a negative margin on the content to come into visibility as well as setting visibility to GONE:

android:layout_marginBottom="-50dip"

和写了动画操作下边距：

and wrote an animation manipulating the bottom margin:

public class ExpandAnimation extends Animation {
...
    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        super.applyTransformation(interpolatedTime, t);

        if (interpolatedTime < 1.0f) {

            // Calculating the new bottom margin, and setting it
            mViewLayoutParams.bottomMargin = mMarginStart
                    + (int) ((mMarginEnd - mMarginStart) * interpolatedTime);

            // Invalidating the layout, making us seeing the changes we made
            mAnimatedView.requestLayout();
        }
        ...
    }
}

和它看起来非常漂亮。我发现他的回答此等问题（可能重复）：

and it looks very nice. I found his answer to this SO (possible duplicate?) question:

<一个href="http://stackoverflow.com/questions/3851420/adding-animation-to-a-listview-in-order-to-expand-collapse-content">Adding动画到ListView以展开/折叠内容

此外，请让我知道如果你知道另一种方式做同样的事情。

Also, please let me know if you know another way to do the same thing.

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