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。
@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); } /** * hdh: 创建动画层 * * @return */ 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; } /** * hdh: * * @param vp * @param view * @param location * @return */ 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; } /** * hdh:动画 * * @param v * @param start_location */ 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); } }); } 
