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      1 package com.android.car.media.widgets;
      2 
      3 import android.animation.Animator;
      4 import android.animation.AnimatorListenerAdapter;
      5 import android.annotation.NonNull;
      6 import android.view.View;
      7 
      8 /**
      9  * Utility methods to operate over views.
     10  */
     11 public class ViewUtils {
     12     /**
     13      * Hides a view using a fade-out animation
     14      *
     15      * @param view {@link View} to be hidden
     16      * @param duration animation duration in milliseconds.
     17      */
     18     public static void hideViewAnimated(@NonNull View view, int duration) {
     19         if (view.getVisibility() == View.GONE) {
     20             return;
     21         }
     22         if (!view.isLaidOut()) {
     23             // If the view hasn't been displayed yet, just adjust visibility without animation
     24             view.setVisibility(View.GONE);
     25             return;
     26         }
     27         view.animate()
     28                 .alpha(0f)
     29                 .setDuration(duration)
     30                 .setListener(new AnimatorListenerAdapter() {
     31                     @Override
     32                     public void onAnimationEnd(Animator animation) {
     33                         view.setVisibility(View.GONE);
     34                     }
     35                 });
     36     }
     37 
     38     /**
     39      * Shows a view using a fade-in animation
     40      *
     41      * @param view {@link View} to be shown
     42      * @param duration animation duration in milliseconds.
     43      */
     44     public static void showViewAnimated(@NonNull View view, int duration) {
     45         if (view.getVisibility() == View.VISIBLE) {
     46             return;
     47         }
     48         if (!view.isLaidOut()) {
     49             // If the view hasn't been displayed yet, just adjust visibility without animation
     50             view.setVisibility(View.VISIBLE);
     51             return;
     52         }
     53         view.animate()
     54                 .alpha(1f)
     55                 .setDuration(duration)
     56                 .setListener(new AnimatorListenerAdapter() {
     57                     @Override
     58                     public void onAnimationStart(Animator animation) {
     59                         view.setAlpha(0f);
     60                         view.setVisibility(View.VISIBLE);
     61                     }
     62                 });
     63     }
     64 }
     65