1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.tv.ui;
import android.animation.Animator;
import android.animation.ValueAnimator;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* A class that includes convenience methods for view classes.
*/
public class ViewUtils {
private static final String TAG = "ViewUtils";
private ViewUtils() {
// Prevent instantiation.
}
public static void setTransitionAlpha(View v, float alpha) {
Method method;
try {
method = View.class.getDeclaredMethod("setTransitionAlpha", Float.TYPE);
method.invoke(v, alpha);
} catch (NoSuchMethodException|IllegalAccessException|IllegalArgumentException
|InvocationTargetException e) {
Log.e(TAG, "Fail to call View.setTransitionAlpha", e);
}
}
/**
* Creates an animator in view's height
* @param target the {@link view} animator performs on.
*/
public static Animator createHeightAnimator(
final View target, int initialHeight, int targetHeight) {
ValueAnimator animator = ValueAnimator.ofInt(initialHeight, targetHeight);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int value = (Integer) animation.getAnimatedValue();
if (value == 0) {
if (target.getVisibility() != View.GONE) {
target.setVisibility(View.GONE);
}
} else {
if (target.getVisibility() != View.VISIBLE) {
target.setVisibility(View.VISIBLE);
}
setLayoutHeight(target, value);
}
}
});
return animator;
}
/**
* Gets view's layout height.
*/
public static int getLayoutHeight(View view) {
LayoutParams layoutParams = view.getLayoutParams();
return layoutParams.height;
}
/**
* Sets view's layout height.
*/
public static void setLayoutHeight(View view, int height) {
LayoutParams layoutParams = view.getLayoutParams();
if (height != layoutParams.height) {
layoutParams.height = height;
view.setLayoutParams(layoutParams);
}
}
}
|