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

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >

     <Button
         android:id="@+id/btnClick"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="click()"
         android:text="开始动画" />

 </RelativeLayout>

2.然后是java代码MainActivity.java，这个是重点

 package com.example.curveanim;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.animation.AccelerateInterpolator;
 import android.view.animation.Animation;
 import android.view.animation.Animation.AnimationListener;
 import android.view.animation.AnimationSet;
 import android.view.animation.LinearInterpolator;
 import android.view.animation.TranslateAnimation;
 import android.widget.ImageView;
 import android.widget.LinearLayout;

 public class MainActivity extends Activity {
     private ViewGroup anim_mask_layout;// 动画层

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         findViewById(R.id.btnClick).setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 click(v);
             }
         });
     }

     private void click(View v) {
         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
         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）
         ImageView ball = new ImageView(getApplicationContext());
         ball.setImageResource(R.drawable.sign);// 设置ball的图片
         setAnim(ball, startLocation);// 开始执行动画
     }

     private void setAnim(final View v, int[] startLocation) {
         anim_mask_layout = null;
         anim_mask_layout = createAnimLayout();
         anim_mask_layout.addView(v);// 把动画小球添加到动画层
         final View view = addViewToAnimLayout(anim_mask_layout, v, startLocation);

         // 计算位移

         TranslateAnimation translateAnimationX = new TranslateAnimation(0, 400, 0, 0);
         translateAnimationX.setInterpolator(new LinearInterpolator());
         translateAnimationX.setRepeatCount(Animation.INFINITE);// 动画重复执行的次数
         translateAnimationX.setFillAfter(true);

         TranslateAnimation translateAnimationY = new TranslateAnimation(0, 0, 0, 400);
         translateAnimationY.setInterpolator(new AccelerateInterpolator());
         translateAnimationY.setRepeatCount(Animation.INFINITE);// 动画重复执行的次数
         translateAnimationX.setFillAfter(true);

         AnimationSet set = new AnimationSet(false);
         set.setFillAfter(false);
         set.addAnimation(translateAnimationY);
         set.addAnimation(translateAnimationX);
         set.setDuration(2000);// 动画的执行时间
         view.startAnimation(set);

         // 动画监听事件
         set.setAnimationListener(new AnimationListener() {
             // 动画的开始
             @Override
             public void onAnimationStart(Animation animation) {
                 v.setVisibility(View.VISIBLE);
             }

             @Override
             public void onAnimationRepeat(Animation animation) {
             }

             // 动画的结束
             @Override
             public void onAnimationEnd(Animation animation) {
                 v.setVisibility(View.GONE);
             }
         });

     }

     /**
      * @Description: 创建动画层
      * @param
      * @return void
      * @throws
      */
     private ViewGroup createAnimLayout() {
         ViewGroup rootView = (ViewGroup) this.getWindow().getDecorView();
         LinearLayout animLayout = new LinearLayout(this);
         LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PA            RENT);
         animLayout.setLayoutParams(lp);
         animLayout.setId(Integer.MAX_VALUE);
         animLayout.setBackgroundResource(android.R.color.transparent);
         rootView.addView(animLayout);
         return animLayout;
     }

     private View addViewToAnimLayout(final ViewGroup parent, final View view, int[] location) {
         int x = location[0];
         int y = location[1];
         LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CON            TENT);
         lp.leftMargin = x;
         lp.topMargin = y;
         view.setLayoutParams(lp);
         return view;
     }
 }

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