其实实现的思路就是利用Tween动画，通过对场景对象的不断变换（旋转，缩放，平移，改变透明度）效果来产生动画效果的。先来分析一下动画效果的形成，我们先把红色Button定义为一级菜单，弹出的子Button作为二级菜单。当点击一级菜单的时候，一级菜单旋转，同时弹出二级菜单。点击二级菜单，进入其他的Activity，不点击画面不变。点击一级菜单，二级菜单消失，一级菜单旋转到默认。所以就涉及到了一级菜单的旋转和二级菜单的缩放以及移动。
一级菜单的实现：
可以采用两种方式来实现，一种是xml布局，另一种就是硬编码了。我们采用第一种方法来实现，这样也比较符合标准。一级菜单是一个旋转效果，所以用Tween动画里的Rotate（旋转）来实现，在这里我们使用xml来定义动画效果，这样比较符合官方标准。
点击旋转动画：
<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" android:fillEnabled="true" android:fillAfter="true"> <rotate android:fromDegrees="0" android:duration="80" android:toDegrees="-45" android:pivotX="50%" android:pivotY="50%" android:interpolator="@android:anim/accelerate_decelerate_interpolator" > </rotate> </set>点击回复动画：
<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" android:fillEnabled="true" android:fillAfter="true"> <rotate android:fromDegrees="-45" android:duration="80" android:toDegrees="0" android:pivotX="50%" android:pivotY="50%" android:interpolator="@android:anim/accelerate_decelerate_interpolator" > </rotate></set>通过这两个xml文件就可以实现一级菜单的旋转效果了，下面来说二级菜单的弹出效果，因为在path里它是在程序的左下角弹出的，当我们使用Tween动画的translate （移动）时，需要指定初始坐标以及终止坐标，这样一来就要弄清楚Android屏幕的坐标系，它是从右上角开始从左到右从上到下，如图：
我们的Button是从左下角弹出的，这样就可以根据屏幕的分辨率来动态的设置菜单坐标。我的手机分辨率是800*480，就以这个来说明。然后我们来看一下Button移动的xml文件。
<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" android:fillEnabled="true" android:fillAfter="true"> <translate android:interpolator="@android:anim/cycle_interpolator" android:fromXDelta="0.0" android:toXDelta="50.0" android:fromYDelta="790" android:toYDelta="650.0" android:duration="80" > </translate> </set>这是最左边的那个Button，大家可以注意下坐标的设置。其他的xml文件就不展示了，原理和这个一样，只不过坐标不同。
最后看一下Activity的实现，
package com.example.imitatepathdemo;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.util.Log;import android.view.Display;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;import android.view.animation.AnimationUtils;import android.widget.Button;import android.widget.TextView;import android.widget.RelativeLayout.LayoutParams;public class ImitatePatn extends Activity { private static Boolean isClick = false; private LayoutParams params = new LayoutParams(0, 0); private TextView refresh; private static int width, height; private Animation animationTranslate1,animationTranslate2,animationTranslate3, animationTranslate4,animationTranslate5,animationTranslate6,animationRotate1,animationRotate2, animationScale1,animationScale2; private Button buttonCamera, buttonDelete, buttonWith, buttonPlace, buttonMusic, buttonThought, buttonSleep; private Intent intent1,intent2,intent3,intent4,intent5,intent6; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_imitate_patn); refresh=(TextView) this.findViewById(R.id.refresh); refresh.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent=new Intent(ImitatePatn.this,SleepActivity.class); startActivity(intent); } }); initialButton(); } private void initialButton() { Display display = getWindowManager().getDefaultDisplay(); height = display.getHeight(); width = display.getWidth(); Log.v("width & height is:", String.valueOf(width) + ", " + String.valueOf(height)); //padding是控件的内容相对控件的边缘的边距． //margin是控件边缘相对父控件，或者其他控件的边距． buttonSleep = (Button) findViewById(R.id.button_composer_sleep); buttonThought = (Button) findViewById(R.id.button_composer_thought); buttonMusic = (Button) findViewById(R.id.button_composer_music); buttonPlace = (Button) findViewById(R.id.button_composer_place); buttonWith = (Button) findViewById(R.id.button_composer_with); buttonCamera = (Button) findViewById(R.id.button_composer_camera); buttonDelete = (Button) findViewById(R.id.button_friends_delete); animationScale1=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.scale_animation1); animationScale2=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.scale_animation2); buttonDelete.setOnClickListener(new OnClickListener() { public void onClick(View v) { //一级菜单旋转，二级菜单弹出 if(isClick == false){ isClick=true; animationRotate1=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.rotate_animation1); buttonDelete.startAnimation(animationRotate1); animationTranslate1=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation1); animationTranslate1.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 500, 0, 0); buttonSleep.setLayoutParams(params); buttonSleep.clearAnimation(); } }); buttonSleep.startAnimation(animationTranslate1); animationTranslate2=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation2); animationTranslate2.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(60, 510, 0, 0); buttonThought.setLayoutParams(params); buttonThought.clearAnimation(); } }); buttonThought.startAnimation(animationTranslate2); animationTranslate3=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation3); animationTranslate3.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(110, 540, 0, 0); buttonMusic.setLayoutParams(params); buttonMusic.clearAnimation(); } }); buttonMusic.startAnimation(animationTranslate3); animationTranslate4=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation4); animationTranslate4.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(150, 570, 0, 0); buttonPlace.setLayoutParams(params); buttonPlace.clearAnimation(); } }); buttonPlace.startAnimation(animationTranslate4); animationTranslate5=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation5); animationTranslate5.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(175, 610, 0, 0); buttonWith.setLayoutParams(params); buttonWith.clearAnimation(); } }); buttonWith.startAnimation(animationTranslate5); animationTranslate6=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation6); animationTranslate6.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(190, 660, 0, 0); buttonCamera.setLayoutParams(params); buttonCamera.clearAnimation(); } }); buttonCamera.startAnimation(animationTranslate6); }else{ isClick=false; animationRotate2=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.rotate_animation2); buttonDelete.startAnimation(animationRotate2); animationTranslate1=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation7); animationTranslate1.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonSleep.setLayoutParams(params); buttonSleep.clearAnimation(); } }); buttonSleep.startAnimation(animationTranslate1); animationTranslate2=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation8); animationTranslate2.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonThought.setLayoutParams(params); buttonThought.clearAnimation(); } }); buttonThought.startAnimation(animationTranslate2); animationTranslate3=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation9); animationTranslate3.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonMusic.setLayoutParams(params); buttonMusic.clearAnimation(); } }); buttonMusic.startAnimation(animationTranslate3); animationTranslate4=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation10); animationTranslate4.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonPlace.setLayoutParams(params); buttonPlace.clearAnimation(); } }); buttonPlace.startAnimation(animationTranslate4); animationTranslate5=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation11); animationTranslate5.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonWith.setLayoutParams(params); buttonWith.clearAnimation(); } }); buttonWith.startAnimation(animationTranslate5); animationTranslate6=AnimationUtils.loadAnimation(ImitatePatn.this, R.anim.translate_animation12); animationTranslate6.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonCamera.setLayoutParams(params); buttonCamera.clearAnimation(); } }); buttonCamera.startAnimation(animationTranslate6); } } }); buttonSleep.setOnClickListener(new OnClickListener() { public void onClick(View v) { buttonSleep.startAnimation(animationScale1); buttonPlace.startAnimation(animationScale2); buttonWith.startAnimation(animationScale2); buttonCamera.startAnimation(animationScale2); buttonMusic.startAnimation(animationScale2); buttonThought.startAnimation(animationScale2); buttonDelete.startAnimation(animationScale2); } }); buttonThought.setOnClickListener(new OnClickListener() { public void onClick(View v) { buttonThought.startAnimation(animationScale1); buttonSleep.startAnimation(animationScale2); buttonPlace.startAnimation(animationScale2); buttonWith.startAnimation(animationScale2); buttonCamera.startAnimation(animationScale2); buttonMusic.startAnimation(animationScale2); buttonDelete.startAnimation(animationScale2); } }); buttonMusic.setOnClickListener(new OnClickListener() { public void onClick(View v) { buttonMusic.startAnimation(animationScale1); buttonThought.startAnimation(animationScale2); buttonSleep.startAnimation(animationScale2); buttonPlace.startAnimation(animationScale2); buttonWith.startAnimation(animationScale2); buttonCamera.startAnimation(animationScale2); buttonDelete.startAnimation(animationScale2); } }); buttonPlace.setOnClickListener(new OnClickListener() { public void onClick(View v) { buttonPlace.startAnimation(animationScale1); buttonMusic.startAnimation(animationScale2); buttonThought.startAnimation(animationScale2); buttonSleep.startAnimation(animationScale2); buttonWith.startAnimation(animationScale2); buttonCamera.startAnimation(animationScale2); buttonDelete.startAnimation(animationScale2); } }); buttonWith.setOnClickListener(new OnClickListener() { public void onClick(View v) { buttonWith.startAnimation(animationScale1); buttonPlace.startAnimation(animationScale2); buttonMusic.startAnimation(animationScale2); buttonThought.startAnimation(animationScale2); buttonSleep.startAnimation(animationScale2); buttonCamera.startAnimation(animationScale2); buttonDelete.startAnimation(animationScale2); } }); buttonCamera.setOnClickListener(new OnClickListener() { public void onClick(View v) { buttonCamera.startAnimation(animationScale1); buttonWith.startAnimation(animationScale2); buttonPlace.startAnimation(animationScale2); buttonMusic.startAnimation(animationScale2); buttonThought.startAnimation(animationScale2); buttonSleep.startAnimation(animationScale2); buttonDelete.startAnimation(animationScale2); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_imitate_patn, menu); return true; }}布局文件是：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" android:background="#ffffff"> <Button android:id="@+id/button_composer_sleep" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_sleep" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true"> </Button> <Button android:id="@+id/button_composer_thought" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_thought" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true" android:layout_above="@id/button_composer_sleep"> </Button> <Button android:id="@+id/button_composer_music" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_music" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true"> </Button> <Button android:id="@+id/button_composer_place" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_place" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true" android:layout_above="@id/button_composer_music"> </Button> <Button android:id="@+id/button_composer_with" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_with" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true" android:layout_above="@id/button_composer_place"> </Button> <Button android:id="@+id/button_composer_camera" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/composer_camera" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true" android:layout_above="@id/button_composer_with"> </Button> <Button android:id="@+id/button_friends_delete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/friends_delete" android:layout_marginBottom="10dip" android:layout_marginLeft="10dip" android:layout_alignParentBottom="true" android:layout_above="@id/button_composer_camera"> </Button></RelativeLayout>
在Activity里，我们实例化菜单的Button对象，然后分别对他们实行动画效果。从xml文件可以看出，这些Button在一个相对布局的视图里堆叠在左下角，一级菜单在最上面，其他的在它的下面，所以刚开始我们只是看到一家菜单而已。从一级菜单Button的监听器里我们一方面实现了它本身的旋转，另一方面其他的Button也弹出。这里有一个很重要的地方需要强调一下，就是在旋转的动画里我们直接xml动画文件可以直接使用Button的监听器，什么意思呢，就是不管Button是否旋转，我们都可以去监听它。但是，这种情况不符合移动的Button，也就是我们的二级菜单，这个情况就是，点击一级菜单弹出二级菜单，但是之后你不能去响应二级菜单，点击没有任何反应。那怎么办呢，处理方法是我们使用setAnimationListener在这个监听器里，是这样处理的
animationTranslate2.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } public void onAnimationEnd(Animation animation) { params = new LayoutParams(0, 0); params.height = 50; params.width = 50; params.setMargins(10, 790, 0, 0); buttonThought.setLayoutParams(params); buttonThought.clearAnimation(); } });就是在动画结束的时候取消动画效果，不然动画状态会锁定，我们不能使用它！！到这里这个仿path的demo就到这里了，需要注意的地方一个是坐标的设定，这个其实还是布局麻烦的，对于不同分辨率的设备，我们需要设定不同的数值；然后就是要注意动画移动后如何去获取使用权，这个如果只用xml还是做不到，需要我们使用代码来辅助完成。效果如下：
标题说到了是拓展，为什么呢，就是我们这个菜单可以放到其他的地方，可以做一个想ppt动画那样从上到下，淡入淡出等等的效果。实现原理和上面是一样的，大家可以发挥想象力，做出漂亮美观的程序。现在很多程序基本上都是静态的，我们可以像path这样，另辟蹊径，开启动态程序的大门，让我们的程序动起来！
需要源码的朋友可以留下你的邮箱，[email protected]