Android RelativeLayout 高度动画

Question

我正在寻找RelativeLayout 的高度动画。通常它应该从基值开始到布局的高度。我试图用EasyAndroidAnimation 库写。但未能成功。下面附上代码。它正在从基地弹起。我需要一些光滑的东西。

new BounceAnimation(this.LayoutGraph)       
    .setBounceDistance(50)
    .setNumOfBounces(5)
    .setDuration(500)
    .animate();

我也在寻找像这样简单的东西，因为我必须将这种方法用于许多布局：

layout.startfrom(basevalue)
layout.to(height of the layout)
layout.animate()

任何帮助将不胜感激。

代码添加*

根据要求，请找到我正在尝试的以下代码。

我通过调用下面的代码来调用动画。

  expand(this.mFirstGraph);

展开方法

   public void expand(final View v) {

            v.measure(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

            int i = (int)(0.075F * this.mWidthScreen);
            //this.mFirstGraph.getLayoutParams().height = i;
            int length=(int)(0.425F * this.mWidthScreen * (this.maxTemp - this.mWeatherModel.mWeekHighTemperatures[0]) / this.ratioTemp);
            final int targetHeight = i+ length;

            Log.e("BASIC5", "targetHeight: "+targetHeight);

            // 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
                            ? LinearLayout.LayoutParams.WRAP_CONTENT
                            : (int)(targetHeight * interpolatedTime);
                    v.requestLayout();
                }

                @Override
                public boolean willChangeBounds() {
                    return true;
                }

                public void animate() {
                    // TODO Auto-generated method stub

                }
            };

            // 1dp/ms
            //a.setDuration((int) (targetHeight / v.getContext().getResources().getDisplayMetrics().density));
            a.setDuration(2000);
            Log.e("BASIC5", "Duration value: "+ (int) (targetHeight / v.getContext().getResources().getDisplayMetrics().density));
            a.setInterpolator(new AccelerateInterpolator(3));
            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;
                }



                public void animate() {
                    // TODO Auto-generated method stub

                }
            };


            // 1dp/ms
             //a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));
            a.setDuration(200);
            //a.setInterpolator(new DecelerateInterpolator());

            v.startAnimation(a);
        }

目前发现的问题

1. 动画不流畅。
2. 高度不合适。我目前正在研究它。

Answer 1

也许这个基本示例可以帮助你：

   public void expand(final View v) {

    v.measure(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    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
                    ? LinearLayout.LayoutParams.WRAP_CONTENT
                    : (int)(targetHeight * interpolatedTime);
            v.requestLayout();
        }

        @Override
        public boolean willChangeBounds() {
            return true;
        }
    };

    // 1dp/ms
    a.setDuration((int) (targetHeight / v.getContext().getResources().getDisplayMetrics().density));
    //a.setInterpolator(new AccelerateInterpolator(3));
    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((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));
    //a.setInterpolator(new DecelerateInterpolator());
    v.startAnimation(a);
}