Android 曲线动画animation，类似加入购物车动画

按照惯例先放效果图：图中小球做抛物线运动

资源图片

1.首先布局文件activity_main.xml，布局很简单，就一个测试按钮

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context=".MainActivity" >
10 
11     <Button
12         android:id="@+id/btnClick"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:onClick="click()"
16         android:text="开始动画" />
17 
18 </RelativeLayout>

2.然后是java代码MainActivity.java，这个是重点

  1 package com.example.curveanim;
  2 
  3 import android.app.Activity;
  4 import android.os.Bundle;
  5 import android.view.View;
  6 import android.view.View.OnClickListener;
  7 import android.view.ViewGroup;
  8 import android.view.animation.AccelerateInterpolator;
  9 import android.view.animation.Animation;
 10 import android.view.animation.Animation.AnimationListener;
 11 import android.view.animation.AnimationSet;
 12 import android.view.animation.LinearInterpolator;
 13 import android.view.animation.TranslateAnimation;
 14 import android.widget.ImageView;
 15 import android.widget.LinearLayout;
 16 
 17 public class MainActivity extends Activity {
 18     private ViewGroup anim_mask_layout;// 动画层
 19 
 20     @Override
 21     protected void onCreate(Bundle savedInstanceState) {
 22         super.onCreate(savedInstanceState);
 23         setContentView(R.layout.activity_main);
 24         findViewById(R.id.btnClick).setOnClickListener(new OnClickListener() {
 25 
 26             @Override
 27             public void onClick(View v) {
 28                 click(v);
 29             }
 30         });
 31     }
 32 
 33     private void click(View v) {
 34         int[] startLocation = new int[2];// 一个整型数组，用来存储按钮的在屏幕的X、Y坐标
 35         v.getLocationInWindow(startLocation);// 这是获取购买按钮的在屏幕的X、Y坐标（这也是动画开始的坐标）
 36         ImageView ball = new ImageView(getApplicationContext());
 37         ball.setImageResource(R.drawable.sign);// 设置ball的图片
 38         setAnim(ball, startLocation);// 开始执行动画
 39     }
 40 
 41     private void setAnim(final View v, int[] startLocation) {
 42         anim_mask_layout = null;
 43         anim_mask_layout = createAnimLayout();
 44         anim_mask_layout.addView(v);// 把动画小球添加到动画层
 45         final View view = addViewToAnimLayout(anim_mask_layout, v, startLocation);
 46 
 47         // 计算位移
 48 
 49         TranslateAnimation translateAnimationX = new TranslateAnimation(0, 400, 0, 0);
 50         translateAnimationX.setInterpolator(new LinearInterpolator());
 51         translateAnimationX.setRepeatCount(Animation.INFINITE);// 动画重复执行的次数
 52         translateAnimationX.setFillAfter(true);
 53 
 54         TranslateAnimation translateAnimationY = new TranslateAnimation(0, 0, 0, 400);
 55         translateAnimationY.setInterpolator(new AccelerateInterpolator());
 56         translateAnimationY.setRepeatCount(Animation.INFINITE);// 动画重复执行的次数
 57         translateAnimationX.setFillAfter(true);
 58 
 59         AnimationSet set = new AnimationSet(false);
 60         set.setFillAfter(false);
 61         set.addAnimation(translateAnimationY);
 62         set.addAnimation(translateAnimationX);
 63         set.setDuration(2000);// 动画的执行时间
 64         view.startAnimation(set);
 65 
 66         // 动画监听事件
 67         set.setAnimationListener(new AnimationListener() {
 68             // 动画的开始
 69             @Override
 70             public void onAnimationStart(Animation animation) {
 71                 v.setVisibility(View.VISIBLE);
 72             }
 73 
 74             @Override
 75             public void onAnimationRepeat(Animation animation) {
 76             }
 77 
 78             // 动画的结束
 79             @Override
 80             public void onAnimationEnd(Animation animation) {
 81                 v.setVisibility(View.GONE);
 82             }
 83         });
 84 
 85     }
 86 
 87     /**
 88      * @Description: 创建动画层
 89      * @param
 90      * @return void
 91      * @throws
 92      */
 93     private ViewGroup createAnimLayout() {
 94         ViewGroup rootView = (ViewGroup) this.getWindow().getDecorView();
 95         LinearLayout animLayout = new LinearLayout(this);
 96         LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PA            RENT);
 97         animLayout.setLayoutParams(lp);
 98         animLayout.setId(Integer.MAX_VALUE);
 99         animLayout.setBackgroundResource(android.R.color.transparent);
100         rootView.addView(animLayout);
101         return animLayout;
102     }
103 
104     private View addViewToAnimLayout(final ViewGroup parent, final View view, int[] location) {
105         int x = location[0];
106         int y = location[1];
107         LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CON            TENT);
108         lp.leftMargin = x;
109         lp.topMargin = y;
110         view.setLayoutParams(lp);
111         return view;
112     }
113 }

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