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

Suragch用科特林语回答。这对我很管用。

class MainActivity : AppCompatActivity() {

var isUp: Boolean = false

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    var myView: View = findViewById(R.id.my_view)
    var myButton: Button = findViewById(R.id.my_button)

    //Initialize as invisible
    myView.visibility = View.INVISIBLE
    myButton.setText("Slide up")

    isUp = false

}


fun View.slideUp(duration: Int = 500){
    visibility = View.VISIBLE
    val animate = TranslateAnimation(0f, 0f, this.height.toFloat(), 0f)
    animate.duration = duration.toLong()
    animate.fillAfter = true
    this.startAnimation(animate)
}

fun View.slideDown(duration: Int = 500) {
    visibility = View.VISIBLE
    val animate = TranslateAnimation(0f, 0f, 0f, this.height.toFloat())
    animate.duration = duration.toLong()
    animate.fillAfter = true
    this.startAnimation(animate)
}

fun onSlideViewButtonClick(view: View){
    if(isUp){
        my_view.slideDown()
        my_button.setText("Slide Up")

    }
    else{
        my_view.slideUp()
        my_button.setText("Slide Down")
    }
    isUp = !isUp
}

}

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

其中一个简单的方法是:

containerView.setLayoutTransition(LayoutTransition())
containerView.layoutTransition.enableTransitionType(LayoutTransition.CHANGING)

一个完整的答案,在onClick中切换视图可见性,也翻转箭头,并在隐藏组件时平滑地向上移动其他视图。

private fun toggleRecyclerViewVisibility(
    recyclerView: RecyclerView,
    container: FrameLayout,
    arrow: ImageView
) {
    //toggle arrow direction, also block user clicks until animation finishes.
    arrow
        .animate()
        .rotation(
            if (arrow.rotation == 0F)
                180F
            else 0F
        )
        .withStartAction { container.isClickable = false }
        .withEndAction { container.isClickable = true }
        .start()

    //toggle recyclerview visibility with animation.
    with(recyclerView) {
        var cof = -1
        var vis = View.GONE
        var alph = 0F

        if (visibility == View.GONE) {
            cof = 0
            vis = View.VISIBLE
            alph = 1F
        }
        animate()
            .translationY(height.toFloat() * cof)
            .alpha(alph)
            .withStartAction {//in case showing the recyclerview show it at the beginning.
                if (vis == View.VISIBLE)
                    visibility = View.VISIBLE
            }
            .withEndAction {//in case hiding the recyclerview hide it at the end.
                if (vis == View.GONE)
                    visibility = View.GONE
            }
            .start()
    }
}

视图是这样的

        <LinearLayout
            android:id="@+id/subRootLinearView"
            android:animateLayoutChanges="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <!--other views-->
            <LinearLayout
                android:id="@+id/Container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <FrameLayout
                    android:id="@+id/header"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/backgroundGray"
                    android:padding="16dp">

                    <TextView
                        android:id="@+id/text_view"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/awaitingConfirmation"
                        android:textColor="@color/colorText"
                        android:textSize="16sp" />

                    <ImageView
                        android:id="@+id/arrow_image_view"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="end|center"
                        android:src="@drawable/ic_arrow" />
                </FrameLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <androidx.recyclerview.widget.RecyclerView
                        android:id="@+id/recycler"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
                </LinearLayout>
            </LinearLayout>

            <!--other views-->
            </LinearLayout>

然后在代码中首先添加这一行,这解决了animateLayoutChanges在大嵌套视图中不工作的问题,这基本上使其他视图在隐藏recyclerview时平滑地向上移动

subRootLinearView.layoutTransition.enableTransitionType(LayoutTransition.CHANGING)

你的父线性布局也应该包含这个属性

android:animateLayoutChanges="true"

然后用视图调用该方法

 toggleRecyclerViewVisibility(
                    recycler,
                    header,
                    arrowImageView
                )

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
}