android - Android: Animation of slide up to below of another view.

Question

Is there any idea or how can i achieve this Animation like following picture? because i tried to give a animation on Linearlayout B when i pressed a cancel button, the linearlayout B will slide out from left to right but once LinearLayout B fully Gone, the LinearLayout C directly step to below of LinearLayout A rather than slide slowly to below of LinearLayout A. please help...

Answer 1

设置android:animateLayoutChanges="true"为线性布局，您将自动实现这一点。

Answer 2

首先在视图 C 中添加一个 ViewTreeObserver.OnPreDraw 监听器：

int bHeight = viewB.getHeight();
viewC.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    public boolean onPreDraw() {
        viewC.startAnimation(new TranslateAnimation(0, 0, bHeight, 0));
        viewC.getViewTreeObserver().removeOnPreDrawListener(this);
        return false;
    }
});

然后将 B 的可见性设置为消失。

viewB.setVisibility(View.GONE);

这样做是隐藏视图 B，导致视图 C 向上移动。然而，在 C 被绘制到它的新位置之前，我们将它从过去的位置动画到现在的位置。