Android中使用动画动态添加商品进购物车

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);
}

/**
* 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);
}
});
}

4、GitHub地址：https://github.com/hdhap/AddGoodAnimation.git,点击打开链接