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?
展开/折叠视图的最佳解决方案:
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
View view = buttonView.getId() == R.id.tb_search ? fSearch : layoutSettings;
transform(view, 200, isChecked
? ViewGroup.LayoutParams.WRAP_CONTENT
: 0);
}
public static void transform(final View v, int duration, int targetHeight) {
int prevHeight = v.getHeight();
v.setVisibility(View.VISIBLE);
ValueAnimator animator;
if (targetHeight == ViewGroup.LayoutParams.WRAP_CONTENT) {
v.measure(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
animator = ValueAnimator.ofInt(prevHeight, v.getMeasuredHeight());
} else {
animator = ValueAnimator.ofInt(prevHeight, targetHeight);
}
animator.addUpdateListener(animation -> {
v.getLayoutParams().height = (animation.getAnimatedFraction() == 1.0f)
? targetHeight
: (int) animation.getAnimatedValue();
v.requestLayout();
});
animator.setInterpolator(new LinearInterpolator());
animator.setDuration(duration);
animator.start();
}
/**
* 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();
}
来自@Tom Esterez和@Geraldo Neto的组合解决方案
public static void expandOrCollapseView(View v,boolean expand){
if(expand){
v.measure(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
final int targetHeight = v.getMeasuredHeight();
v.getLayoutParams().height = 0;
v.setVisibility(View.VISIBLE);
ValueAnimator valueAnimator = ValueAnimator.ofInt(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(500);
valueAnimator.start();
}
else
{
final int initialHeight = v.getMeasuredHeight();
ValueAnimator valueAnimator = ValueAnimator.ofInt(initialHeight,0);
valueAnimator.setInterpolator(new DecelerateInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
v.getLayoutParams().height = (int) animation.getAnimatedValue();
v.requestLayout();
if((int)animation.getAnimatedValue() == 0)
v.setVisibility(View.GONE);
}
});
valueAnimator.setInterpolator(new DecelerateInterpolator());
valueAnimator.setDuration(500);
valueAnimator.start();
}
}
//sample usage
expandOrCollapseView((Your ViewGroup),(Your ViewGroup).getVisibility()!=View.VISIBLE);
平滑动画请使用Handler运行方法.....享受展开/折叠动画
class AnimUtils{
public void expand(final View v) {
int ANIMATION_DURATION=500;//in milisecond
v.measure(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
final int targtetHeight = v.getMeasuredHeight();
v.getLayoutParams().height = 0;
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)(targtetHeight * interpolatedTime);
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
// 1dp/ms
a.setDuration(ANIMATION_DURATION);
// a.setDuration((int)(targtetHeight / v.getContext().getResources().getDisplayMetrics().density));
v.startAnimation(a);
}
public 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;
}
};
// 1dp/ms
a.setDuration(ANIMATION_DURATION);
// a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));
v.startAnimation(a);
}
}
使用下面的代码调用:
private void setAnimationOnView(final View inactive ) {
//I am applying expand and collapse on this TextView ...You can use your view
//for expand animation
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
new AnimationUtililty().expand(inactive);
}
}, 1000);
//For collapse
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
new AnimationUtililty().collapse(inactive);
//inactive.setVisibility(View.GONE);
}
}, 8000);
}
其他解决方案是:
public void expandOrCollapse(final View v,String exp_or_colpse) {
TranslateAnimation anim = null;
if(exp_or_colpse.equals("expand"))
{
anim = new TranslateAnimation(0.0f, 0.0f, -v.getHeight(), 0.0f);
v.setVisibility(View.VISIBLE);
}
else{
anim = new TranslateAnimation(0.0f, 0.0f, 0.0f, -v.getHeight());
AnimationListener collapselistener= new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
v.setVisibility(View.GONE);
}
};
anim.setAnimationListener(collapselistener);
}
// To Collapse
//
anim.setDuration(300);
anim.setInterpolator(new AccelerateInterpolator(0.5f));
v.startAnimation(anim);
}
