1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.systemui.volume;
18 
19 import android.animation.Animator;
20 import android.animation.AnimatorListenerAdapter;
21 import android.content.Context;
22 import android.view.View;
23 import android.view.animation.AnimationUtils;
24 import android.view.animation.Interpolator;
25 
26 public class IconPulser {
27     private static final float PULSE_SCALE = 1.1f;
28 
29     private final Interpolator mFastOutSlowInInterpolator;
30 
IconPulser(Context context)31     public IconPulser(Context context) {
32         mFastOutSlowInInterpolator = AnimationUtils.loadInterpolator(context,
33                 android.R.interpolator.fast_out_slow_in);
34     }
35 
start(final View target)36     public void start(final View target) {
37         if (target == null || target.getScaleX() != 1) return;  // n/a, or already running
38         target.animate().cancel();
39         target.animate().scaleX(PULSE_SCALE).scaleY(PULSE_SCALE)
40                 .setInterpolator(mFastOutSlowInInterpolator)
41                 .setListener(new AnimatorListenerAdapter() {
42                     @Override
43                     public void onAnimationEnd(Animator animation) {
44                         target.animate().scaleX(1).scaleY(1).setListener(null);
45                     }
46                 });
47     }
48 }
49