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.tv.settings.util;
18 
19 import android.animation.ObjectAnimator;
20 import android.content.res.Resources;
21 import android.util.TypedValue;
22 
23 import com.android.tv.settings.R;
24 
25 /**
26  * Utility class for handling transition animations.
27  */
28 public class TransitionUtils {
29 
30     /**
31      * Creates an object animator that use implements the alpha fade-in for an
32      * Activity's background.
33      */
createActivityFadeInAnimator(Resources res, boolean useFloats)34     public static ObjectAnimator createActivityFadeInAnimator(Resources res, boolean useFloats) {
35         TypedValue startAlpha = new TypedValue();
36         res.getValue(R.dimen.alpha_activity_in_bkg_start, startAlpha, true);
37 
38         TypedValue endAlpha = new TypedValue();
39         res.getValue(R.dimen.alpha_activity_in_bkg_end, endAlpha, true);
40 
41         ObjectAnimator animator = new ObjectAnimator();
42         animator.setPropertyName("alpha");
43         if (useFloats) {
44             animator.setFloatValues(startAlpha.getFloat(), endAlpha.getFloat());
45         } else {
46             animator.setIntValues(Float.valueOf(startAlpha.getFloat() * 255).intValue(),
47                     Float.valueOf(endAlpha.getFloat() * 255).intValue());
48         }
49         animator.setDuration(res.getInteger(R.integer.alpha_activity_in_bkg_duration));
50         animator.setStartDelay(res.getInteger(R.integer.alpha_activity_in_bkg_delay));
51         return animator;
52     }
53 
createActivityFadeOutAnimator(Resources res, boolean useFloats)54     public static ObjectAnimator createActivityFadeOutAnimator(Resources res, boolean useFloats) {
55         TypedValue startAlpha = new TypedValue();
56         res.getValue(R.dimen.alpha_activity_out_bkg_start, startAlpha, true);
57 
58         TypedValue endAlpha = new TypedValue();
59         res.getValue(R.dimen.alpha_activity_out_bkg_end, endAlpha, true);
60 
61         ObjectAnimator animator = new ObjectAnimator();
62         animator.setPropertyName("alpha");
63         if (useFloats) {
64             animator.setFloatValues(startAlpha.getFloat(), endAlpha.getFloat());
65         } else {
66             animator.setIntValues(Float.valueOf(startAlpha.getFloat() * 255).intValue(),
67                     Float.valueOf(endAlpha.getFloat() * 255).intValue());
68         }
69         animator.setDuration(res.getInteger(R.integer.alpha_activity_out_bkg_duration));
70         animator.setStartDelay(res.getInteger(R.integer.alpha_activity_out_bkg_delay));
71         return animator;
72     }
73 }
74