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?
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。
/**
* 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();
}
我今天也遇到了同样的问题，我想这个问题的真正解决方案是这样的
<LinearLayout android:id="@+id/container"
android:animateLayoutChanges="true"
...
/>
您必须为所有涉及移位的最顶层布局设置此属性。如果你现在将一个布局的可见性设置为GONE，另一个将在消失的布局释放它时占据空间。会有一个默认的动画，这是某种“淡出”，但我认为你可以改变这个-但最后一个我没有测试，现在。
如果在RecyclerView项目中使用这个，在onBindViewHolder中设置视图的可见性来展开/折叠，并调用notifyItemChanged(position)来触发转换。
override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
...
holder.list.visibility = data[position].listVisibility
holder.expandCollapse.setOnClickListener {
data[position].listVisibility = if (data[position].listVisibility == View.GONE) View.VISIBLE else View.GONE
notifyItemChanged(position)
}
}
如果你在onBindViewHolder中执行昂贵的操作，你可以使用notifyItemChanged(位置，有效载荷)优化部分更改
private const val UPDATE_LIST_VISIBILITY = 1
override fun onBindViewHolder(holder: ItemViewHolder, position: Int, payloads: MutableList<Any>) {
if (payloads.contains(UPDATE_LIST_VISIBILITY)) {
holder.list.visibility = data[position].listVisibility
} else {
onBindViewHolder(holder, position)
}
}
override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
...
holder.list.visibility = data[position].listVisibility
holder.expandCollapse.setOnClickListener {
data[position].listVisibility = if (data[position].listVisibility == View.GONE) View.VISIBLE else View.GONE
notifyItemChanged(position, UPDATE_LIST_VISIBILITY)
}
}
好吧，我刚刚发现了一个非常丑陋的解决方案:
public static Animation expand(final View v, Runnable onEnd) {
try {
Method m = v.getClass().getDeclaredMethod("onMeasure", int.class, int.class);
m.setAccessible(true);
m.invoke(
v,
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(((View)v.getParent()).getMeasuredHeight(), MeasureSpec.AT_MOST)
);
} catch (Exception e){
Log.e("test", "", e);
}
final int initialHeight = v.getMeasuredHeight();
Log.d("test", "initialHeight="+initialHeight);
v.getLayoutParams().height = 0;
v.setVisibility(View.VISIBLE);
Animation a = new Animation()
{
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
final int newHeight = (int)(initialHeight * interpolatedTime);
v.getLayoutParams().height = newHeight;
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
a.setDuration(5000);
v.startAnimation(a);
return a;
}
请随意提出一个更好的解决方案!
我试图做一个我认为非常相似的动画，并找到了一个优雅的解决方案。这段代码假设你总是从0->h或h->0 (h是最大高度)。三个构造函数参数是view =要动画的视图(在我的例子中是webview)， targetHeight =视图的最大高度，以及down =一个布尔值，用于指定方向(true =展开，false =折叠)。
public class DropDownAnim extends Animation {
private final int targetHeight;
private final View view;
private final boolean down;
public DropDownAnim(View view, int targetHeight, boolean down) {
this.view = view;
this.targetHeight = targetHeight;
this.down = down;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
int newHeight;
if (down) {
newHeight = (int) (targetHeight * interpolatedTime);
} else {
newHeight = (int) (targetHeight * (1 - interpolatedTime));
}
view.getLayoutParams().height = newHeight;
view.requestLayout();
}
@Override
public void initialize(int width, int height, int parentWidth,
int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
}
@Override
public boolean willChangeBounds() {
return true;
}
}
