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
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=)
其他回答
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);
}
});
}
}
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);
}
});
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;
}
}
这里有另一种方法来处理多个按钮(在这个例子中是ImageView)
MainActivity.java
findViewById(R.id.arrowIV).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (strokeWidthIV.getAlpha() == 0f) {
findViewById(R.id.arrowIV).animate().rotationBy(180);
strokeWidthIV.animate().translationXBy(-120 * 4).alpha(1f);
findViewById(R.id.colorChooseIV).animate().translationXBy(-120 * 3).alpha(1f);
findViewById(R.id.saveIV).animate().translationXBy(-120 * 2).alpha(1f);
findViewById(R.id.clearAllIV).animate().translationXBy(-120).alpha(1f);
} else {
findViewById(R.id.arrowIV).animate().rotationBy(180);
strokeWidthIV.animate().translationXBy(120 * 4).alpha(0f);
findViewById(R.id.colorChooseIV).animate().translationXBy(120 * 3).alpha(0f);
findViewById(R.id.saveIV).animate().translationXBy(120 * 2).alpha(0f);
findViewById(R.id.clearAllIV).animate().translationXBy(120).alpha(0f);
}
}
});
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.MainActivity">
<ImageView
android:id="@+id/strokeWidthIV"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_margin="8dp"
android:alpha="0"
android:contentDescription="Clear All"
android:padding="4dp"
android:scaleType="fitXY"
android:src="@drawable/ic_edit"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText" />
<ImageView
android:id="@+id/colorChooseIV"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_margin="8dp"
android:alpha="0"
android:contentDescription="Clear All"
android:padding="4dp"
android:scaleType="fitXY"
android:src="@drawable/ic_palette"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText" />
<ImageView
android:id="@+id/saveIV"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_margin="8dp"
android:alpha="0"
android:contentDescription="Clear All"
android:padding="4dp"
android:scaleType="fitXY"
android:src="@drawable/ic_save"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText" />
<ImageView
android:id="@+id/clearAllIV"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_margin="8dp"
android:alpha="0"
android:contentDescription="Clear All"
android:padding="4dp"
android:scaleType="fitXY"
android:src="@drawable/ic_clear_all"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText" />
<ImageView
android:id="@+id/arrowIV"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_margin="8dp"
android:contentDescription="Arrow"
android:padding="4dp"
android:scaleType="fitXY"
android:src="@drawable/ic_arrow"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="HardcodedText" />
</androidx.constraintlayout.widget.ConstraintLayout>
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