转载：原文地址：
http://www.cnblogs.com/mudoot/archive/2012/01/19/path_composer_menu.html
实现Path2.0中绚丽的的旋转菜单
2012-01-19 05:30 by MudooT, 3548 阅读, 13 评论, 收藏, 编辑
最近真的是忙死了，做了很久的这个菜单动画特效，都没有时间写博客，今天在机场等飞机终于有了空闲时间。
上图先：
那么下面开始吧~
首先，将整个菜单动画分解开来。
1. 一级菜单按钮的旋转动画2个，十字和叉叉状态的转换。
2. 二级菜单按钮的平移动画2个，弹簧效果的in和out
3. 二级菜单按钮的点击效果，放大消失，其他未点击按钮缩小消失。
4. 一级菜单按钮的恢复效果，放大出现
好的 逐一去实现：
首先是一级菜单按钮的旋转动画，这2个动画可以直接在xml中定义，然后load到代码中来，具体代码如下：
rotate_story_add_button_in.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <rotate
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:interpolator="@android:anim/linear_interpolator"
5 android:duration="150"
6 android:fromDegrees="0.0"
7 android:toDegrees="-225.0"
8 android:pivotX="50.0%"
9 android:pivotY="50.0%"
10 android:fillAfter="true"
11 android:fillEnabled="true"
12 />
2 <rotate
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:interpolator="@android:anim/linear_interpolator"
5 android:duration="150"
6 android:fromDegrees="0.0"
7 android:toDegrees="-225.0"
8 android:pivotX="50.0%"
9 android:pivotY="50.0%"
10 android:fillAfter="true"
11 android:fillEnabled="true"
12 />
rotate_story_add_button_out.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <rotate
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:interpolator="@android:anim/linear_interpolator"
5 android:duration="150"
6 android:fromDegrees="-225.0"
7 android:toDegrees="0.0"
8 android:pivotX="50.0%"
9 android:pivotY="50.0%"
10 android:fillAfter="true"
11 android:fillEnabled="true"
12 />
2 <rotate
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:interpolator="@android:anim/linear_interpolator"
5 android:duration="150"
6 android:fromDegrees="-225.0"
7 android:toDegrees="0.0"
8 android:pivotX="50.0%"
9 android:pivotY="50.0%"
10 android:fillAfter="true"
11 android:fillEnabled="true"
12 />
这2段没什么好说的，定义好角度即可。
接下来是需要我们在代码中定义的动画部分，这几个动画的部分需要定义一个基类，作为统一的调用接口，这个基类被称作InOutAnimation,继承自AnimationSet，这个基类的主要工作是为view提供in和out两种不同的状态时的动画效果。其子类需要实现2个方法：
1 protected abstract void addInAnimation(View aview[]);
2 protected abstract void addOutAnimation(View aview[]);
2 protected abstract void addOutAnimation(View aview[]);
从而进行view的入场和离场动画。
下面是InOutAnimation的代码部分：
1 public abstract class InOutAnimation extends AnimationSet {
2
3 public Direction direction;
4
5 public enum Direction {
6 IN, OUT;
7 }
8
9 public InOutAnimation(Direction direction, long l, View[] aview) {
10 super(true);
11 this.direction = direction;
12 switch (this.direction) {
13 case IN:
14 addInAnimation(aview);
15 break;
16 case OUT:
17 addOutAnimation(aview);
18
19 break;
20 }
21 setDuration(l);
22 }
23
24 protected abstract void addInAnimation(View aview[]);
25
26 protected abstract void addOutAnimation(View aview[]);
27
28 }
2
3 public Direction direction;
4
5 public enum Direction {
6 IN, OUT;
7 }
8
9 public InOutAnimation(Direction direction, long l, View[] aview) {
10 super(true);
11 this.direction = direction;
12 switch (this.direction) {
13 case IN:
14 addInAnimation(aview);
15 break;
16 case OUT:
17 addOutAnimation(aview);
18
19 break;
20 }
21 setDuration(l);
22 }
23
24 protected abstract void addInAnimation(View aview[]);
25
26 protected abstract void addOutAnimation(View aview[]);
27
28 }
接下来就是重头戏啦，二级菜单按钮的平移动画。
这部分动画看起来可能会比较复杂和神秘，其实不然，当把整个动画过程分解开来的时候，都是最最简单的平移而已，我们要做的只是定义一下平移的起点和终点、开始动画的顺序以及插值（Interpolator），让整个过程看起来很炫。
先说动画的起点和终点吧，起点很简单，就是整个view的左下角，即0,0点，为了效果漂亮一些，我们稍微的将左下角位置定义的有一些偏移，经验上的值是16，-13，这个点的位置看你心情而定咯~ 好 终点就是你想让他在的点上就好了，终点我们将定义到layout中去，为这个2级菜单指定一个margin的值就好。
还是上代码比较直观：
动画如下：
1 收缩部分：TranslateAnimation(xOffset + -mlp.leftMargin, 0F,yOffset + mlp.bottomMargin, 0F)
2 扩张部分：TranslateAnimation(0F, xOffset + -mlp.leftMargin, 0F,yOffset + mlp.bottomMargin)
2 扩张部分：TranslateAnimation(0F, xOffset + -mlp.leftMargin, 0F,yOffset + mlp.bottomMargin)
位置定义部分：
例如：
android:layout_marginBottom="142dp" android:layout_marginLeft="10.667dp"
这个位置大家可以直观的在布局文件中看到，详细的布局文件也将在下面展示。
以上是单独的每一个二级按钮的动画，而组合的动画就是指定了一下开始的时间差以及插值：
这个就是奥妙所在了，OvershootInterpolator AnticipateInterpolator 这2个插值器提供了弹力效果。
整段的代码如下：
ComposerButtonAnimation.java
1 public class ComposerButtonAnimation extends InOutAnimation {
2
3 public static final int DURATION = 500;
4 private static final int xOffset = 16;
5 private static final int yOffset = -13;
6
7 public ComposerButtonAnimation(Direction direction, long l, View view) {
8 super(direction, l, new View[] { view });
9 }
10
11 public static void startAnimations(ViewGroup viewgroup,
12 InOutAnimation.Direction direction) {
13 switch (direction) {
14 case IN:
15 startAnimationsIn(viewgroup);
16 break;
17 case OUT:
18 startAnimationsOut(viewgroup);
19 break;
20 }
21 }
22
23 private static void startAnimationsIn(ViewGroup viewgroup) {
24 for (int i = 0; i < viewgroup.getChildCount(); i++) {
25 if (viewgroup.getChildAt(i) instanceof InOutImageButton) {
26 InOutImageButton inoutimagebutton = (InOutImageButton) viewgroup
27 .getChildAt(i);
28 ComposerButtonAnimation animation = new ComposerButtonAnimation(
29 InOutAnimation.Direction.IN, DURATION, inoutimagebutton);
30 animation.setStartOffset((i * 100)
31 / (-1 + viewgroup.getChildCount()));
32 animation.setInterpolator(new OvershootInterpolator(2F));
33 inoutimagebutton.startAnimation(animation);
34 }
35 }
36 }
37
38 private static void startAnimationsOut(ViewGroup viewgroup) {
39 for (int i = 0; i < viewgroup.getChildCount(); i++) {
40 if (viewgroup.getChildAt(i) instanceof InOutImageButton) {
41 InOutImageButton inoutimagebutton = (InOutImageButton) viewgroup
42 .getChildAt(i);
43 ComposerButtonAnimation animation = new ComposerButtonAnimation(
44 InOutAnimation.Direction.OUT, DURATION,
45 inoutimagebutton);
46 animation.setStartOffset((100 * ((-1 + viewgroup
47 .getChildCount()) - i))
48 / (-1 + viewgroup.getChildCount()));
49 animation.setInterpolator(new AnticipateInterpolator(2F));
50 inoutimagebutton.startAnimation(animation);
51 }
52 }
53 }
54
55 @Override
56 protected void addInAnimation(View[] aview) {
57 MarginLayoutParams mlp = (MarginLayoutParams) aview[0]
58 .getLayoutParams();
59 addAnimation(new TranslateAnimation(xOffset + -mlp.leftMargin, 0F,
60 yOffset + mlp.bottomMargin, 0F));
61 }
62
63 @Override
64 protected void addOutAnimation(View[] aview) {
65 MarginLayoutParams mlp = (MarginLayoutParams) aview[0]
66 .getLayoutParams();
67 addAnimation(new TranslateAnimation(0F, xOffset + -mlp.leftMargin, 0F,
68 yOffset + mlp.bottomMargin));
69 }
70 }
2
3 public static final int DURATION = 500;
4 private static final int xOffset = 16;
5 private static final int yOffset = -13;
6
7 public ComposerButtonAnimation(Direction direction, long l, View view) {
8 super(direction, l, new View[] { view });
9 }
10
11 public static void startAnimations(ViewGroup viewgroup,
12 InOutAnimation.Direction direction) {
13 switch (direction) {
14 case IN:
15 startAnimationsIn(viewgroup);
16 break;
17 case OUT:
18 startAnimationsOut(viewgroup);
19 break;
20 }
21 }
22
23 private static void startAnimationsIn(ViewGroup viewgroup) {
24 for (int i = 0; i < viewgroup.getChildCount(); i++) {
25 if (viewgroup.getChildAt(i) instanceof InOutImageButton) {
26 InOutImageButton inoutimagebutton = (InOutImageButton) viewgroup
27 .getChildAt(i);
28 ComposerButtonAnimation animation = new ComposerButtonAnimation(
29 InOutAnimation.Direction.IN, DURATION, inoutimagebutton);
30 animation.setStartOffset((i * 100)
31 / (-1 + viewgroup.getChildCount()));
32 animation.setInterpolator(new OvershootInterpolator(2F));
33 inoutimagebutton.startAnimation(animation);
34 }
35 }
36 }
37
38 private static void startAnimationsOut(ViewGroup viewgroup) {
39 for (int i = 0; i < viewgroup.getChildCount(); i++) {
40 if (viewgroup.getChildAt(i) instanceof InOutImageButton) {
41 InOutImageButton inoutimagebutton = (InOutImageButton) viewgroup
42 .getChildAt(i);
43 ComposerButtonAnimation animation = new ComposerButtonAnimation(
44 InOutAnimation.Direction.OUT, DURATION,
45 inoutimagebutton);
46 animation.setStartOffset((100 * ((-1 + viewgroup
47 .getChildCount()) - i))
48 / (-1 + viewgroup.getChildCount()));
49 animation.setInterpolator(new AnticipateInterpolator(2F));
50 inoutimagebutton.startAnimation(animation);
51 }
52 }
53 }
54
55 @Override
56 protected void addInAnimation(View[] aview) {
57 MarginLayoutParams mlp = (MarginLayoutParams) aview[0]
58 .getLayoutParams();
59 addAnimation(new TranslateAnimation(xOffset + -mlp.leftMargin, 0F,
60 yOffset + mlp.bottomMargin, 0F));
61 }
62
63 @Override
64 protected void addOutAnimation(View[] aview) {
65 MarginLayoutParams mlp = (MarginLayoutParams) aview[0]
66 .getLayoutParams();
67 addAnimation(new TranslateAnimation(0F, xOffset + -mlp.leftMargin, 0F,
68 yOffset + mlp.bottomMargin));
69 }
70 }
剩下的增大出现、增大消失及缩小消失都是scale和alpha的组合动画
例如增大出现为：
1 addAnimation(new ScaleAnimation(0F, 1F, 0F, 1F, 1, 0.5F, 1, 0.5F));
2 addAnimation(new AlphaAnimation(0F, 1F));
2 addAnimation(new AlphaAnimation(0F, 1F));
整段的代码如下：
1 public class ComposerButtonGrowAnimationIn extends InOutAnimation {
2
3 public ComposerButtonGrowAnimationIn(int i) {
4 super(InOutAnimation.Direction.IN, i, new View[0]);
5 }
6
7 @Override
8 protected void addInAnimation(View[] aview) {
9 addAnimation(new ScaleAnimation(0F, 1F, 0F, 1F, 1, 0.5F, 1, 0.5F));
10 addAnimation(new AlphaAnimation(0F, 1F));
11
12 }
13
14 @Override
15 protected void addOutAnimation(View[] aview) {}
16
17 }
18
19 public class ComposerButtonGrowAnimationOut extends InOutAnimation {
20
21 public ComposerButtonGrowAnimationOut(int i) {
22 super(InOutAnimation.Direction.OUT, i, new View[0]);
23 }
24
25 @Override
26 protected void addInAnimation(View[] aview) {}
27
28 @Override
29 protected void addOutAnimation(View[] aview) {
30 addAnimation(new ScaleAnimation(1F, 5F, 1F, 5F, 1, 0.5F, 1, 0.5F));
31 addAnimation(new AlphaAnimation(1F, 0F));
32 }
33
34 } public class ComposerButtonShrinkAnimationOut extends InOutAnimation {
35
36 public ComposerButtonShrinkAnimationOut(int i) {
37 super(InOutAnimation.Direction.OUT, i, new View[0]);
38 }
39
40 @Override
41 protected void addInAnimation(View[] aview) {
42
43 }
44
45 @Override
46 protected void addOutAnimation(View[] aview) {
47 addAnimation(new ScaleAnimation(1F, 0F, 1F, 0F, 1, 0.5F, 1, 0.5F));
48 addAnimation(new AlphaAnimation(1F, 0F));
49 }
50
51 }
2
3 public ComposerButtonGrowAnimationIn(int i) {
4 super(InOutAnimation.Direction.IN, i, new View[0]);
5 }
6
7 @Override
8 protected void addInAnimation(View[] aview) {
9 addAnimation(new ScaleAnimation(0F, 1F, 0F, 1F, 1, 0.5F, 1, 0.5F));
10 addAnimation(new AlphaAnimation(0F, 1F));
11
12 }
13
14 @Override
15 protected void addOutAnimation(View[] aview) {}
16
17 }
18
19 public class ComposerButtonGrowAnimationOut extends InOutAnimation {
20
21 public ComposerButtonGrowAnimationOut(int i) {
22 super(InOutAnimation.Direction.OUT, i, new View[0]);
23 }
24
25 @Override
26 protected void addInAnimation(View[] aview) {}
27
28 @Override
29 protected void addOutAnimation(View[] aview) {
30 addAnimation(new ScaleAnimation(1F, 5F, 1F, 5F, 1, 0.5F, 1, 0.5F));
31 addAnimation(new AlphaAnimation(1F, 0F));
32 }
33
34 } public class ComposerButtonShrinkAnimationOut extends InOutAnimation {
35
36 public ComposerButtonShrinkAnimationOut(int i) {
37 super(InOutAnimation.Direction.OUT, i, new View[0]);
38 }
39
40 @Override
41 protected void addInAnimation(View[] aview) {
42
43 }
44
45 @Override
46 protected void addOutAnimation(View[] aview) {
47 addAnimation(new ScaleAnimation(1F, 0F, 1F, 0F, 1, 0.5F, 1, 0.5F));
48 addAnimation(new AlphaAnimation(1F, 0F));
49 }
50
51 }
接下来我们需要为这些控件做一下扩展，以便其可以再动画完成后显示或消失。
很简单
1 public class InOutImageButton extends ImageButton {
2
3 private Animation animation;
4
5 public InOutImageButton(Context context, AttributeSet attrs, int defStyle) {
6 super(context, attrs, defStyle);
7 }
8
9 public InOutImageButton(Context context, AttributeSet attrs) {
10 super(context, attrs);
11 }
12
13 public InOutImageButton(Context context) {
14 super(context);
15 }
16
17 @Override
18 protected void onAnimationEnd() {
19 super.onAnimationEnd();
20 if ((this.animation instanceof InOutAnimation)) {
21 setVisibility(((InOutAnimation) this.animation).direction != InOutAnimation.Direction.OUT ? View.VISIBLE
22 : View.GONE);
23 }
24 }
25
26 @Override
27 protected void onAnimationStart() {
28 super.onAnimationStart();
29 if ((this.animation instanceof InOutAnimation))
30 setVisibility(View.VISIBLE);
31 }
32
33 @Override
34 public void startAnimation(Animation animation) {
35 super.startAnimation(animation);
36 this.animation = animation;
37 getRootView().postInvalidate();
38 }
39 }
2
3 private Animation animation;
4
5 public InOutImageButton(Context context, AttributeSet attrs, int defStyle) {
6 super(context, attrs, defStyle);
7 }
8
9 public InOutImageButton(Context context, AttributeSet attrs) {
10 super(context, attrs);
11 }
12
13 public InOutImageButton(Context context) {
14 super(context);
15 }
16
17 @Override
18 protected void onAnimationEnd() {
19 super.onAnimationEnd();
20 if ((this.animation instanceof InOutAnimation)) {
21 setVisibility(((InOutAnimation) this.animation).direction != InOutAnimation.Direction.OUT ? View.VISIBLE
22 : View.GONE);
23 }
24 }
25
26 @Override
27 protected void onAnimationStart() {
28 super.onAnimationStart();
29 if ((this.animation instanceof InOutAnimation))
30 setVisibility(View.VISIBLE);
31 }
32
33 @Override
34 public void startAnimation(Animation animation) {
35 super.startAnimation(animation);
36 this.animation = animation;
37 getRootView().postInvalidate();
38 }
39 }
那么到这里基本上就已经搞定了所有的事情了，剩下点没做的事就是把这些动画效果设置给对应的控件了，这里就不详细描述了，大家有兴趣可以直接下载源码来搞一下啦~