我有一个线性布局,我想显示或隐藏与动画,推动布局向上或向下每当我改变其可见性。

我在那里看过一些样品,但没有一个适合我的需要。

我已经为动画创建了两个xml文件,但我不知道当我改变线性布局的可见性时如何启动它们。


当前回答

你可以使用简单的三行代码来显示动画…

//getting the hiding view by animation

 mbinding.butn.setOnClickListener {

                val SlideOutLeft = AnimationUtils.loadAnimation(this, R.anim.slide_out_left)
                simplelayout.visibility = View.INVISIBLE
                simplelayout.startAnimation(SlideOutLeft)


                val SlideInRight = AnimationUtils.loadAnimation(applicationContext, R.anim.slide_in_right)
                animation1.visibility = View.VISIBLE
                animation1.startAnimation(SlideInRight)

            }
            //again unhide the view animation
            mbinding.buttn.setOnClickListener {


               val SlideInLeft=AnimationUtils.loadAnimation(this,R.anim.slide_in_left)
                //set the layout
               simplelayout.visibility=View.VISIBLE
               simplelayout.startAnimation(SlideInLeft)

               val SlideOutRight=AnimationUtils.loadAnimation(this,R.anim.slide_out_right)
               animation1.visibility=View.INVISIBLE
               animation1.startAnimation(SlideOutRight)

            }

其他回答

当LinearLayout的可见性改变时,你可以通过创建LinearLayout的一个新的子类并覆盖setVisibility()来启动动画来启动正确的动画。考虑一下这样的事情:

public class SimpleViewAnimator extends LinearLayout
{
    private Animation inAnimation;
    private Animation outAnimation;

    public SimpleViewAnimator(Context context)
    {
        super(context);
    }

    public void setInAnimation(Animation inAnimation)
    {
        this.inAnimation = inAnimation;
    }

    public void setOutAnimation(Animation outAnimation)
    {
        this.outAnimation = outAnimation;
    }

    @Override
    public void setVisibility(int visibility)
    {
        if (getVisibility() != visibility)
        {
            if (visibility == VISIBLE)
            {
                if (inAnimation != null) startAnimation(inAnimation);
            }
            else if ((visibility == INVISIBLE) || (visibility == GONE))
            {
                if (outAnimation != null) startAnimation(outAnimation);
            }
        }

        super.setVisibility(visibility);
    }
}

从ashakirov的回答为Kotlin用户

 val transition: Transition = Slide(Gravity.BOTTOM)
                transition.duration = 600
                transition.addTarget(you_parent_layout_id)
TransitionManager.beginDelayedTransition(rootLayoutId, transition)
                yourViewIdToHide.visibility = if (yourViewIdToHide.isShown) View.GONE else View.VISIBLE

随着Android 3.0 (Honeycomb)引入的新动画API,创建这样的动画非常简单。

将视图向下滑动一段距离:

view.animate().translationY(distance);

你可以稍后将视图滑回原来的位置,如下所示:

view.animate().translationY(0);

您还可以轻松地组合多个动画。下面的动画会将一个视图按高度向下滑动,同时淡入:

// Prepare the View for the animation
view.setVisibility(View.VISIBLE);
view.setAlpha(0.0f);

// Start the animation
view.animate()
    .translationY(view.getHeight())
    .alpha(1.0f)
    .setListener(null);

然后,您可以将视图淡出,并将其滑回原始位置。我们还设置了一个AnimatorListener,这样我们可以在动画完成后将视图的可见性设置为GONE:

view.animate()
    .translationY(0)
    .alpha(0.0f)
    .setListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            super.onAnimationEnd(animation);
            view.setVisibility(View.GONE);
        }
    });

如果你想同时显示/隐藏多个视图,你可以使用TransitionSet(因为你不能同时播放2个“单个”过渡)

fun slideTopBottomVisibility(topLayout: View, bottomLayout: View, show: Boolean) {
    val topTransition: Transition = Slide(Gravity.TOP)
    topTransition.duration = 600
    topTransition.addTarget(topLayout)

    val bottomTransition: Transition = Slide(Gravity.BOTTOM)
    bottomTransition.duration = 600
    bottomTransition.addTarget(bottomLayout)

    val transitionSet = TransitionSet()
    transitionSet.addTransition(topTransition)
    transitionSet.addTransition(bottomTransition)

    TransitionManager.beginDelayedTransition(topLayout.parent as ViewGroup, transitionSet)
    topLayout.visibility = if (show) View.VISIBLE else View.GONE
    bottomLayout.visibility = if (show) View.VISIBLE else View.GONE
}

最简单的解决方案:在持有视图的容器上设置android:animateLayoutChanges="true"。

如果你有一个如下所示的布局,这个容器中所有视图的可见性变化都将自动动画化。

<LinearLayout android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:animateLayoutChanges="true"
    >

    <Views_which_change_visibility>

</LinearLayout>

你可以在动画布局变化- Android开发者上找到更多细节