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
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);
}
});
}
}
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);
}
});
}
}
使用这个类:
public class ExpandCollapseExtention {
public static void expand(View view) {
view.setVisibility(View.VISIBLE);
final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
view.measure(widthSpec, heightSpec);
ValueAnimator mAnimator = slideAnimator(view, 0, view.getMeasuredHeight());
mAnimator.start();
}
public static void collapse(final View view) {
int finalHeight = view.getHeight();
ValueAnimator mAnimator = slideAnimator(view, finalHeight, 0);
mAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationEnd(Animator animator) {
view.setVisibility(View.GONE);
}
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
mAnimator.start();
}
private static ValueAnimator slideAnimator(final View v, int start, int end) {
ValueAnimator animator = ValueAnimator.ofInt(start, end);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int value = (Integer) valueAnimator.getAnimatedValue();
ViewGroup.LayoutParams layoutParams = v.getLayoutParams();
layoutParams.height = value;
v.setLayoutParams(layoutParams);
}
});
return animator;
}
}
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。
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
}
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)
}
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