过渡没有动画

Question

我有一个以ImageView为中心的RelativeLayout：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/splashActivity_root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.yarkoni.anybody.activities.SplashScreenActivity">

    <ImageView
        android:id="@+id/splashActivity_logo"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_gravity="top"
        android:layout_margin="@dimen/spacing_medium"
        android:layout_centerInParent="true"
        android:background="@color/colorAccent" />

</RelativeLayout>

我正在尝试将视图设置为底部：

TransitionManager.beginDelayedTransition(mRoot, new ChangeBounds().addTarget(mLogoIV).setStartDelay(1000).setInterpolator(new AccelerateDecelerateInterpolator()).setDuration(5000));
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) mLogoIV.getLayoutParams();
params.removeRule(RelativeLayout.CENTER_IN_PARENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
mLogoIV.setLayoutParams(params);

没有过渡布局，如下所示：

通过转换，布局如下所示：

问题在于动画并没有实际发生，而ImageView只是立即出现在底部。

编辑1：

以下解决了问题：

mRoot.post(new Runnable() {
    @Override
    public void run() {

        TransitionManager.beginDelayedTransition(mRoot, new ChangeBounds().addTarget(mLogoIV).setStartDelay(1000).setInterpolator(new AccelerateDecelerateInterpolator()).setDuration(5000));
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) mLogoIV.getLayoutParams();
        params.removeRule(RelativeLayout.CENTER_IN_PARENT);
        params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        params.addRule(RelativeLayout.CENTER_HORIZONTAL);
        mLogoIV.setLayoutParams(params);

    }
});

但现在我的问题是为什么当使用处理程序时它仍然不起作用：

new Handler().post(new Runnable() {
    @Override
    public void run() {

        TransitionManager.beginDelayedTransition(mRoot, new ChangeBounds().addTarget(mLogoIV).setStartDelay(1000).setInterpolator(new AccelerateDecelerateInterpolator()).setDuration(5000));
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) mLogoIV.getLayoutParams();
        params.removeRule(RelativeLayout.CENTER_IN_PARENT);
        params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        params.addRule(RelativeLayout.CENTER_HORIZONTAL);
        mLogoIV.setLayoutParams(params);

    }
});