Android使用动画动态添加商品进购物车

本文实例为大家分享了Android添加商品进购物车的具体代码，供大家参考，具体内容如下

1、首先展示下效果图

2、讲一下思路，小球由加号位置运动到购物车位置，首先得获得这两个点在整个屏幕中的坐标，然后分别计算这两个点的横纵坐标的差值，再通过TranslateAnimation这个类设置小球在X、Y方向上的偏移量，最后通过AnimationSet这个类将这两个动画放在一起执行。这是小球运动的动画，还有就是购物车变大缩小的动画。这个动画通过ObjectAnimator的ofFloat的方法设置缩放，要注意的是当小球落下的时候，购物车才开始动画，所以要设置一下setStartDelay这个方法。

3、具体的代码我就贴一下动画部分的代码，如果想要这个Demo看下我最后贴出的Github的地址

@Override
  public void setAnim(View view) {
    // TODO Auto-generated method stub
    int[] start_location = new int[2];// 一个整型数组用来存储按钮在屏幕的X,Y坐标
    view.getLocationInWindow(start_location);// 购买按钮在屏幕中的坐标
    buyImg = new ImageView(this);// 动画的小圆圈
    buyImg.setImageResource(R.drawable.sign);// 设置buyImg的图片
    setAnim(buyImg, start_location);
  }
 
  
  private ViewGroup createAnimLayout() {
    ViewGroup rootView = (ViewGroup) this.getWindow().getDecorView();// 获得Window界面的最顶层
    LinearLayout animLayout = new LinearLayout(this);
    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
    animLayout.setLayoutParams(lp);
    //animLayout.setId();
    animLayout.setBackgroundResource(android.R.color.transparent);
    rootView.addView(animLayout);
    return animLayout;
  }
 
  
  private View addViewToAnimLayout(final ViewGroup vp, 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_CONTENT);
    lp.leftMargin = x;
    lp.topMargin = y;
    view.setLayoutParams(lp);
    return view;
  }
 
  
  private void setAnim(final View v, int[] start_location) {
    anim_mask_layout = null;
    anim_mask_layout = createAnimLayout();
    anim_mask_layout.addView(v);
    View view = addViewToAnimLayout(anim_mask_layout, v, start_location);
    int[] end_location = new int[2];// 存储动画结束位置的X,Y坐标
    text_chart_num.getLocationInWindow(end_location);// 将购物车的位置存储起来
    // 计算位移
    int endX = end_location[0] - start_location[0];// 动画位移的X坐标
    int endY = end_location[1] - start_location[1];// 动画位移的y坐标
    TranslateAnimation translateAnimationX = new TranslateAnimation(0, endX, 0, 0);
    translateAnimationX.setInterpolator(new LinearInterpolator());// 设置此动画的加速曲线。默认为一个线性插值。
    translateAnimationX.setRepeatCount(0);// 动画重复的次数
    translateAnimationX.setFillAfter(true);
 
    TranslateAnimation translateAnimationY = new TranslateAnimation(0, 0, 0, endY);
    translateAnimationY.setInterpolator(new AccelerateInterpolator());
    translateAnimationY.setRepeatCount(0);// 动画重复次数
    translateAnimationY.setFillAfter(true);
 
    AnimationSet set = new AnimationSet(false);
    set.setFillAfter(false);
    set.addAnimation(translateAnimationX);
    set.addAnimation(translateAnimationY);
    set.setDuration(1000);
    view.startAnimation(set);
    set.setAnimationListener(new Animation.AnimationListener() {
 
      @Override
      public void onAnimationStart(Animation animation) {
 // TODO Auto-generated method stub
 v.setVisibility(View.VISIBLE);
      }
 
      @Override
      public void onAnimationRepeat(Animation animation) {
 // TODO Auto-generated method stub
 
      }
 
      @Override
      public void onAnimationEnd(Animation animation) {
 // TODO Auto-generated method stub
 v.setVisibility(View.GONE);
      }
    });
    ObjectAnimator anim = ObjectAnimator//
 .ofFloat(view, "scale", 1.0F, 1.5F, 1.0f)//
 .setDuration(500);//
    anim.setStartDelay(1000);
    anim.start();
    anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
 float cVal = (Float) animation.getAnimatedValue();
 image_chart.setScaleX(cVal);
 image_chart.setScaleY(cVal);
 text_chart_num.setScaleX(cVal);
 text_chart_num.setScaleY(cVal);
      }
    });
  }

4、GitHub地址：点击打开链接

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