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
通过Kotlin扩展，你可以这样使用:
enum class SlideDirection{
UP,
DOWN,
LEFT,
RIGHT
}
enum class SlideType{
SHOW,
HIDE
}
fun View.slideAnimation(direction: SlideDirection, type: SlideType, duration: Long = 250){
val fromX: Float
val toX: Float
val fromY: Float
val toY: Float
val array = IntArray(2)
getLocationInWindow(array)
if((type == SlideType.HIDE && (direction == SlideDirection.RIGHT || direction == SlideDirection.DOWN)) ||
(type == SlideType.SHOW && (direction == SlideDirection.LEFT || direction == SlideDirection.UP)) ){
val displayMetrics = DisplayMetrics()
val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
windowManager.defaultDisplay.getMetrics(displayMetrics)
val deviceWidth = displayMetrics.widthPixels
val deviceHeight = displayMetrics.heightPixels
array[0] = deviceWidth
array[1] = deviceHeight
}
when (direction) {
SlideDirection.UP -> {
fromX = 0f
toX = 0f
fromY = if(type == SlideType.HIDE) 0f else (array[1] + height).toFloat()
toY = if(type == SlideType.HIDE) -1f * (array[1] + height) else 0f
}
SlideDirection.DOWN -> {
fromX = 0f
toX = 0f
fromY = if(type == SlideType.HIDE) 0f else -1f * (array[1] + height)
toY = if(type == SlideType.HIDE) 1f * (array[1] + height) else 0f
}
SlideDirection.LEFT -> {
fromX = if(type == SlideType.HIDE) 0f else 1f * (array[0] + width)
toX = if(type == SlideType.HIDE) -1f * (array[0] + width) else 0f
fromY = 0f
toY = 0f
}
SlideDirection.RIGHT -> {
fromX = if(type == SlideType.HIDE) 0f else -1f * (array[0] + width)
toX = if(type == SlideType.HIDE) 1f * (array[0] + width) else 0f
fromY = 0f
toY = 0f
}
}
val animate = TranslateAnimation(
fromX,
toX,
fromY,
toY
)
animate.duration = duration
animate.setAnimationListener(object: Animation.AnimationListener{
override fun onAnimationRepeat(animation: Animation?) {
}
override fun onAnimationEnd(animation: Animation?) {
if(type == SlideType.HIDE){
visibility = View.INVISIBLE
}
}
override fun onAnimationStart(animation: Animation?) {
visibility = View.VISIBLE
}
})
startAnimation(animate)
}
扩展示例:
view.slideAnimation(SlideDirection.UP, SlideType.HIDE)//to make it disappear through top of the screen
view.slideAnimation(SlideDirection.DOWN, SlideType.SHOW)//to make it reappear from top of the screen
view.slideAnimation(SlideDirection.DOWN, SlideType.HIDE)//to make it disappear through bottom of the screen
view.slideAnimation(SlideDirection.UP, SlideType.SHOW)//to make it reappear from bottom of the screen
其他回答
我有一个角落的情况，我的视图高度仍然是0所以。
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.view.View;
public final class AnimationUtils {
public static void slideDown(final View view) {
view.animate()
.translationY(view.getHeight())
.alpha(0.f)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
// superfluous restoration
view.setVisibility(View.GONE);
view.setAlpha(1.f);
view.setTranslationY(0.f);
}
});
}
public static void slideUp(final View view) {
view.setVisibility(View.VISIBLE);
view.setAlpha(0.f);
if (view.getHeight() > 0) {
slideUpNow(view);
} else {
// wait till height is measured
view.post(new Runnable() {
@Override
public void run() {
slideUpNow(view);
}
});
}
}
private static void slideUpNow(final View view) {
view.setTranslationY(view.getHeight());
view.animate()
.translationY(0)
.alpha(1.f)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
view.setVisibility(View.VISIBLE);
view.setAlpha(1.f);
}
});
}
}
这是我的解决方案。只需要获取视图的引用并调用这个方法:
public static void animateViewFromBottomToTop(final View view){
view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
final int TRANSLATION_Y = view.getHeight();
view.setTranslationY(TRANSLATION_Y);
view.setVisibility(View.GONE);
view.animate()
.translationYBy(-TRANSLATION_Y)
.setDuration(500)
.setStartDelay(200)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(final Animator animation) {
view.setVisibility(View.VISIBLE);
}
})
.start();
}
});
}
不需要做任何其他事情=)
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
)
现在可见性改变动画应该通过过渡API来完成，该API在支持(androidx)包中可用。只需调用TransitionManager。beginDelayedTransition方法使用Slide过渡，然后改变视图的可见性。
import androidx.transition.Slide;
import androidx.transition.Transition;
import androidx.transition.TransitionManager;
private void toggle(boolean show) {
View redLayout = findViewById(R.id.redLayout);
ViewGroup parent = findViewById(R.id.parent);
Transition transition = new Slide(Gravity.BOTTOM);
transition.setDuration(600);
transition.addTarget(R.id.redLayout);
TransitionManager.beginDelayedTransition(parent, transition);
redLayout.setVisibility(show ? View.VISIBLE : View.GONE);
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/parent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="play" />
<LinearLayout
android:id="@+id/redLayout"
android:layout_width="match_parent"
android:layout_height="400dp"
android:background="#5f00"
android:layout_alignParentBottom="true" />
</RelativeLayout>
用另一个默认和自定义转换示例检查这个答案。
我在理解和应用公认的答案时遇到了困难。我需要更多的背景知识。现在我已经搞清楚了，下面是一个完整的例子:
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button myButton;
View myView;
boolean isUp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myView = findViewById(R.id.my_view);
myButton = findViewById(R.id.my_button);
// initialize as invisible (could also do in xml)
myView.setVisibility(View.INVISIBLE);
myButton.setText("Slide up");
isUp = false;
}
// slide the view from below itself to the current position
public void slideUp(View view){
view.setVisibility(View.VISIBLE);
TranslateAnimation animate = new TranslateAnimation(
0, // fromXDelta
0, // toXDelta
view.getHeight(), // fromYDelta
0); // toYDelta
animate.setDuration(500);
animate.setFillAfter(true);
view.startAnimation(animate);
}
// slide the view from its current position to below itself
public void slideDown(View view){
TranslateAnimation animate = new TranslateAnimation(
0, // fromXDelta
0, // toXDelta
0, // fromYDelta
view.getHeight()); // toYDelta
animate.setDuration(500);
animate.setFillAfter(true);
view.startAnimation(animate);
}
public void onSlideViewButtonClick(View view) {
if (isUp) {
slideDown(myView);
myButton.setText("Slide up");
} else {
slideUp(myView);
myButton.setText("Slide down");
}
isUp = !isUp;
}
}
activity_mail.xml
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.slideview.MainActivity">
<Button
android:id="@+id/my_button"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dp"
android:onClick="onSlideViewButtonClick"
android:layout_width="150dp"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/my_view"
android:background="#a6e1aa"
android:orientation="vertical"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="200dp">
</LinearLayout>
</RelativeLayout>
笔记
感谢这篇文章为我指明了正确的方向。它比本页上的其他答案更有帮助。 如果你想从屏幕上的视图开始，那么不要将它初始化为INVISIBLE。 因为我们是完全在屏幕外制作动画，所以没有必要将它设置为INVISIBLE。如果你的动画不是完全脱离屏幕，那么你可以添加一个alpha动画，并使用AnimatorListenerAdapter设置可见性。 动画文档
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