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      1 package com.example.android.xyztouristattractions.ui;
      2 
      3 import android.animation.Animator;
      4 import android.animation.ObjectAnimator;
      5 import android.animation.PropertyValuesHolder;
      6 import android.annotation.TargetApi;
      7 import android.content.Context;
      8 import android.os.Build;
      9 import android.transition.TransitionValues;
     10 import android.transition.Visibility;
     11 import android.util.AttributeSet;
     12 import android.view.View;
     13 import android.view.ViewGroup;
     14 
     15 /**
     16  * A simple scale transition class to allow an element to scale in or out.
     17  * This is used by the floating action button on the attraction detail screen
     18  * when it appears and disappears during the Activity transitions.
     19  */
     20 @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     21 public class ScaleTransition extends Visibility {
     22 
     23     public ScaleTransition(Context context, AttributeSet attrs) {
     24         super(context, attrs);
     25     }
     26 
     27     public Animator createAnimation(View view, float startScale, float endScale) {
     28         view.setScaleX(startScale);
     29         view.setScaleY(startScale);
     30         PropertyValuesHolder holderX = PropertyValuesHolder.ofFloat("scaleX", startScale, endScale);
     31         PropertyValuesHolder holderY = PropertyValuesHolder.ofFloat("scaleY", startScale, endScale);
     32         return ObjectAnimator.ofPropertyValuesHolder(view, holderX, holderY);
     33     }
     34 
     35     @Override
     36     public Animator onAppear(ViewGroup sceneRoot, View view, TransitionValues startValues,
     37                              TransitionValues endValues) {
     38         return createAnimation(view, 0, 1);
     39     }
     40 
     41     @Override
     42     public Animator onDisappear(ViewGroup sceneRoot, View view, TransitionValues startValues,
     43                                 TransitionValues endValues) {
     44         return createAnimation(view, 1, 0);
     45     }
     46 }