假设我有一个垂直线性布局:
[v1]
[v2]
默认情况下，v1已经可见= GONE。我想用一个展开动画显示v1，同时下推v2。
我是这样做的:
Animation a = new Animation()
{
int initialHeight;
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
final int newHeight = (int)(initialHeight * interpolatedTime);
v.getLayoutParams().height = newHeight;
v.requestLayout();
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
initialHeight = height;
}
@Override
public boolean willChangeBounds() {
return true;
}
};
但是用这个解决方案，当动画开始时我有一个眨眼。我认为这是由于v1在应用动画之前显示全尺寸。
用javascript，这是一行jQuery!android有什么简单的方法吗?
/**
* Animation that either expands or collapses a view by sliding it down to make
* it visible. Or by sliding it up so it will hide. It will look like it slides
* behind the view above.
*
*/
public class FinalExpandCollapseAnimation extends Animation
{
private View mAnimatedView;
private int mEndHeight;
private int mType;
public final static int COLLAPSE = 1;
public final static int EXPAND = 0;
private LinearLayout.LayoutParams mLayoutParams;
private RelativeLayout.LayoutParams mLayoutParamsRel;
private String layout;
private Context context;
/**
* Initializes expand collapse animation, has two types, collapse (1) and
* expand (0).
*
* @param view
* The view to animate
* @param type
* The type of animation: 0 will expand from gone and 0 size to
* visible and layout size defined in xml. 1 will collapse view
* and set to gone
*/
public FinalExpandCollapseAnimation(View view, int type, int height, String layout, Context context)
{
this.layout = layout;
this.context = context;
mAnimatedView = view;
mEndHeight = mAnimatedView.getMeasuredHeight();
if (layout.equalsIgnoreCase("linear"))
mLayoutParams = ((LinearLayout.LayoutParams) view.getLayoutParams());
else
mLayoutParamsRel = ((RelativeLayout.LayoutParams) view.getLayoutParams());
mType = type;
if (mType == EXPAND)
{
AppConstant.ANIMATED_VIEW_HEIGHT = height;
}
else
{
if (layout.equalsIgnoreCase("linear"))
mLayoutParams.topMargin = 0;
else
mLayoutParamsRel.topMargin = convertPixelsIntoDensityPixels(36);
}
setDuration(600);
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t)
{
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f)
{
if (mType == EXPAND)
{
if (layout.equalsIgnoreCase("linear"))
{
mLayoutParams.height = AppConstant.ANIMATED_VIEW_HEIGHT
+ (-AppConstant.ANIMATED_VIEW_HEIGHT + (int) (AppConstant.ANIMATED_VIEW_HEIGHT * interpolatedTime));
}
else
{
mLayoutParamsRel.height = AppConstant.ANIMATED_VIEW_HEIGHT
+ (-AppConstant.ANIMATED_VIEW_HEIGHT + (int) (AppConstant.ANIMATED_VIEW_HEIGHT * interpolatedTime));
}
mAnimatedView.setVisibility(View.VISIBLE);
}
else
{
if (layout.equalsIgnoreCase("linear"))
mLayoutParams.height = mEndHeight - (int) (mEndHeight * interpolatedTime);
else
mLayoutParamsRel.height = mEndHeight - (int) (mEndHeight * interpolatedTime);
}
mAnimatedView.requestLayout();
}
else
{
if (mType == EXPAND)
{
if (layout.equalsIgnoreCase("linear"))
{
mLayoutParams.height = AppConstant.ANIMATED_VIEW_HEIGHT;
mLayoutParams.topMargin = 0;
}
else
{
mLayoutParamsRel.height = AppConstant.ANIMATED_VIEW_HEIGHT;
mLayoutParamsRel.topMargin = convertPixelsIntoDensityPixels(36);
}
mAnimatedView.setVisibility(View.VISIBLE);
mAnimatedView.requestLayout();
}
else
{
if (layout.equalsIgnoreCase("linear"))
mLayoutParams.height = 0;
else
mLayoutParamsRel.height = 0;
mAnimatedView.setVisibility(View.GONE);
mAnimatedView.requestLayout();
}
}
}
private int convertPixelsIntoDensityPixels(int pixels)
{
DisplayMetrics metrics = context.getResources().getDisplayMetrics();
return (int) metrics.density * pixels;
}
}
该类可以通过以下方式调用
if (findViewById(R.id.ll_specailoffer_show_hide).getVisibility() == View.VISIBLE) {
((ImageView) findViewById(R.id.iv_specialhour_seemore)).setImageResource(R.drawable.white_dropdown_up);
FinalExpandCollapseAnimation finalExpandCollapseAnimation = new FinalExpandCollapseAnimation(
findViewById(R.id.ll_specailoffer_show_hide),
FinalExpandCollapseAnimation.COLLAPSE,
SpecialOfferHeight, "linear", this);
findViewById(R.id.ll_specailoffer_show_hide)
.startAnimation(finalExpandCollapseAnimation);
((View) findViewById(R.id.ll_specailoffer_show_hide).getParent()).invalidate();
} else {
((ImageView) findViewById(R.id.iv_specialhour_seemore)).setImageResource(R.drawable.white_dropdown);
FinalExpandCollapseAnimation finalExpandCollapseAnimation = new FinalExpandCollapseAnimation(
findViewById(R.id.ll_specailoffer_show_hide),
FinalExpandCollapseAnimation.EXPAND,
SpecialOfferHeight, "linear", this);
findViewById(R.id.ll_specailoffer_show_hide)
.startAnimation(finalExpandCollapseAnimation);
((View) findViewById(R.id.ll_specailoffer_show_hide).getParent()).invalidate();
}
这是一个合适的工作解决方案，我已经测试过了:
例如：
private void expand(View v) {
v.setVisibility(View.VISIBLE);
v.measure(View.MeasureSpec.makeMeasureSpec(PARENT_VIEW.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
final int targetHeight = v.getMeasuredHeight();
mAnimator = slideAnimator(0, targetHeight);
mAnimator.setDuration(800);
mAnimator.start();
}
崩溃:
private void collapse(View v) {
int finalHeight = v.getHeight();
mAnimator = slideAnimator(finalHeight, 0);
mAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
//Height=0, but it set visibility to GONE
llDescp.setVisibility(View.GONE);
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
mAnimator.start();
}
动画师的值:
private ValueAnimator slideAnimator(int start, int end) {
ValueAnimator mAnimator = ValueAnimator.ofInt(start, end);
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
//Update Height
int value = (Integer) valueAnimator.getAnimatedValue();
ViewGroup.LayoutParams layoutParams = llDescp.getLayoutParams();
layoutParams.height = value;
v.setLayoutParams(layoutParams);
}
});
return mAnimator;
}
视图v是要被动画的视图，PARENT_VIEW是包含该视图的容器视图。
这是我的解决方案，我的ImageView从100%增长到200%，并返回到原来的大小，使用res/anim/文件夹中的两个动画文件
anim_grow.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator">
<scale
android:fromXScale="1.0"
android:toXScale="2.0"
android:fromYScale="1.0"
android:toYScale="2.0"
android:duration="3000"
android:pivotX="50%"
android:pivotY="50%"
android:startOffset="2000" />
</set>
anim_shrink.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator">
<scale
android:fromXScale="2.0"
android:toXScale="1.0"
android:fromYScale="2.0"
android:toYScale="1.0"
android:duration="3000"
android:pivotX="50%"
android:pivotY="50%"
android:startOffset="2000" />
</set>
发送一个ImageView到setAnimationGrowShrink()方法
ImageView img1 = (ImageView)findViewById(R.id.image1);
setAnimationGrowShrink(img1);
setAnimationGrowShrink()方法:
private void setAnimationGrowShrink(final ImageView imgV){
final Animation animationEnlarge = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.anim_grow);
final Animation animationShrink = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.anim_shrink);
imgV.startAnimation(animationEnlarge);
animationEnlarge.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {}
@Override
public void onAnimationRepeat(Animation animation) {}
@Override
public void onAnimationEnd(Animation animation) {
imgV.startAnimation(animationShrink);
}
});
animationShrink.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {}
@Override
public void onAnimationRepeat(Animation animation) {}
@Override
public void onAnimationEnd(Animation animation) {
imgV.startAnimation(animationEnlarge);
}
});
}
加上Tom Esterez的精彩回答和Erik B的精彩更新，我想我应该发布我自己的观点，将扩展和收缩方法压缩为一个。通过这种方式，你可以有这样一个动作……
button.setOnClickListener(v -> expandCollapse(view));
．.． 它调用下面的方法，并让它在每次onClick()之后弄清楚要做什么…
public static void expandCollapse(View view) {
boolean expand = view.getVisibility() == View.GONE;
Interpolator easeInOutQuart = PathInterpolatorCompat.create(0.77f, 0f, 0.175f, 1f);
view.measure(
View.MeasureSpec.makeMeasureSpec(((View) view.getParent()).getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
);
int height = view.getMeasuredHeight();
int duration = (int) (height/view.getContext().getResources().getDisplayMetrics().density);
Animation animation = new Animation() {
@Override protected void applyTransformation(float interpolatedTime, Transformation t) {
if (expand) {
view.getLayoutParams().height = 1;
view.setVisibility(View.VISIBLE);
if (interpolatedTime == 1) {
view.getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
} else {
view.getLayoutParams().height = (int) (height * interpolatedTime);
}
view.requestLayout();
} else {
if (interpolatedTime == 1) {
view.setVisibility(View.GONE);
} else {
view.getLayoutParams().height = height - (int) (height * interpolatedTime);
view.requestLayout();
}
}
}
@Override public boolean willChangeBounds() {
return true;
}
};
animation.setInterpolator(easeInOutQuart);
animation.setDuration(duration);
view.startAnimation(animation);
}
我采用了@LenaYan的解决方案，但它并没有正常工作
对我来说(因为它在折叠和/或扩展之前将视图转换为0高度视图)并做了一些更改。
现在它工作得很好，通过获取视图之前的高度并开始扩展这个大小。坍缩也是一样的。
你可以简单地复制和粘贴下面的代码:
public static void expand(final View v, int duration, int targetHeight) {
int prevHeight = v.getHeight();
v.setVisibility(View.VISIBLE);
ValueAnimator valueAnimator = ValueAnimator.ofInt(prevHeight, targetHeight);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
v.getLayoutParams().height = (int) animation.getAnimatedValue();
v.requestLayout();
}
});
valueAnimator.setInterpolator(new DecelerateInterpolator());
valueAnimator.setDuration(duration);
valueAnimator.start();
}
public static void collapse(final View v, int duration, int targetHeight) {
int prevHeight = v.getHeight();
ValueAnimator valueAnimator = ValueAnimator.ofInt(prevHeight, targetHeight);
valueAnimator.setInterpolator(new DecelerateInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
v.getLayoutParams().height = (int) animation.getAnimatedValue();
v.requestLayout();
}
});
valueAnimator.setInterpolator(new DecelerateInterpolator());
valueAnimator.setDuration(duration);
valueAnimator.start();
}
用法:
//Expanding the View
expand(yourView, 2000, 200);
// Collapsing the View
collapse(yourView, 2000, 100);
很容易!
感谢LenaYan提供的初始代码!
我看到这个问题很受欢迎，所以我发布了我的实际解决方案。主要的优点是你不需要知道扩展的高度来应用动画，一旦视图被扩展，它会在内容改变时适应高度。这对我来说很有效。
public static void expand(final View v) {
int matchParentMeasureSpec = View.MeasureSpec.makeMeasureSpec(((View) v.getParent()).getWidth(), View.MeasureSpec.EXACTLY);
int wrapContentMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
v.measure(matchParentMeasureSpec, wrapContentMeasureSpec);
final int targetHeight = v.getMeasuredHeight();
// Older versions of android (pre API 21) cancel animations for views with a height of 0.
v.getLayoutParams().height = 1;
v.setVisibility(View.VISIBLE);
Animation a = new Animation()
{
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
v.getLayoutParams().height = interpolatedTime == 1
? LayoutParams.WRAP_CONTENT
: (int)(targetHeight * interpolatedTime);
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
// Expansion speed of 1dp/ms
a.setDuration((int)(targetHeight / v.getContext().getResources().getDisplayMetrics().density));
v.startAnimation(a);
}
public static void collapse(final View v) {
final int initialHeight = v.getMeasuredHeight();
Animation a = new Animation()
{
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
if(interpolatedTime == 1){
v.setVisibility(View.GONE);
}else{
v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);
v.requestLayout();
}
}
@Override
public boolean willChangeBounds() {
return true;
}
};
// Collapse speed of 1dp/ms
a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));
v.startAnimation(a);
}
正如@Jefferson在评论中提到的，你可以通过改变动画的持续时间(以及速度)来获得更流畅的动画。目前，它已设置为1dp/ms的速度
