Essential Android Animators edit forum

Expand and Collapse animation of View

public class ViewAnimationUtils {
        
        public static void expand(final View v) {
            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;
                }
            };
    
            a.setDuration((int)(targtetHeight / 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;
                }
            };
    
            a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));
            v.startAnimation(a);
        }
    }

Table Of Contents
39 ACRA
56 Animators
64 Menu
112 Loader
119 Xposed
132 Colors
135 Fresco
140 AdMob
147 Button
156 Vk SDK
170 XMPP
176 OpenCV
200 FileIO
203 Moshi
217 Paint
231 AIDL
241 JCodec
243 Okio
255 Looper
  ↑ ↓ to navigate     ↵ to select     Esc to close