我正在尝试设置水平列表项目的动画 alpha动画有效,layoutparam值也会随着时间的推移而减少 但由于某种原因,这不会改变列表项的实际高度。
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
final int initialHeight = view.getMeasuredHeight();
if(interpolatedTime == 1){
imageAdapter.remove(view, position);
}else{
view.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);
view.setAlpha(1 - interpolatedTime);
System.out.println(" v height = " + view.getHeight());
System.out.println(" v layoutparams = " + view.getLayoutParams().height);
view.forceLayout();
view.invalidate();
view.requestLayout();
}
}
这是在imadeAdapter的getView方法中 和binBtn是您触摸以删除列表项的按钮
binBtn.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if (event.getAction() == MotionEvent.ACTION_UP)
{
View vp = (View) v.getParent();
SqueezeAnimation ani = new SqueezeAnimation(this,vp,position);
ani.setDuration(1000);
v.startAnimation(ani);
在Tanis回答之后更改为此代码,但仍然是同样的问题, getHeight()打印674和getLayoutParams()。高度打印100
else{
RelativeLayout.LayoutParams lps = new RelativeLayout.LayoutParams(100, 100);
view.setLayoutParams(lps);
view.requestLayout();
System.out.println(" v height = " + view.getHeight());
System.out.println(" v layoutparams = " + view.getLayoutParams().height);
作为旁注,这是在imageadapter的getView方法中,它改变了该视图的高度,并且我已经尝试将backgroundfillIV传递给动画,但仍然无法正常工作
View backgroundfillIV = gridView.findViewById(R.id.backroundfillbar);
double mult = products.get(position).value/ products.get(0).value;
backgroundfillIV.getLayoutParams().height = (int) ( (((bottleheight+20)*0.95)/mult));
答案 0 :(得分:6)
您需要在某个时候致电setLayoutParams()
以将更改保存到LayoutParams。
例如:
LayoutParams lps = view.getLayoutParams();
lps.height = initialHeight - (int)(initialHeight * interpolatedTime);
view.setAlpha(1 - interpolatedTime);
view.setLayoutParams(lps);
这是因为getLayoutParams()
方法只返回LayoutParams引用的副本,而不是对LayoutParams本身的引用。在Does Java return by reference or value进行了更深入的讨论。
答案 1 :(得分:0)
不是真正的解决方案,但问题在于我找到的HorizontalListView,因为它适用于普通的列表视图