Android仿天猫商品抛物线加入购物车动画

public class MainActivity extends Activity {
 
 private ImageView top;
 private ImageView bottom;
 private ImageView animImageView;
 private ViewGroup anim_mask_layout;// 动画层
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 top = (ImageView) findViewById(R.id.top);
 bottom = (ImageView) findViewById(R.id.bottom);
 
 }
 
 public void startAnim(View view) {
 // 记录开始的位置
 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
 top.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）
 
 // 创建要做动画的ImageView
 animImageView = new ImageView(this);
 
 // 设置animImageView的背景
 Drawable background = top.getBackground();
 Drawable zoomDrawable = zoomDrawable(background, dip2Px(this, 200),
 dip2Px(this, 200));
 animImageView.setBackgroundDrawable(zoomDrawable);
 
 // 开始执行动画
 setAnim(animImageView, startLocation, top);
 }
 
 /**
 * 设置动画
 * 
 * @param v
 * @param startLocation
 * @param view
 */
 private void setAnim(final View v, int[] startLocation, final View view) {
 
 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 viewa = addViewToAnimLayout(anim_mask_layout, v,
 startLocation);
 int[] endLocation = new int[2];// 存储动画结束位置的X、Y坐标
 bottom.getLocationInWindow(endLocation);// shopCart是那个购物车
 
 // 计算位移
 int endX = endLocation[0] - startLocation[0];// 动画位移的X坐标
 int endY = endLocation[1] - startLocation[1];// 动画位移的y坐标
 TranslateAnimation translateAnimationX = new TranslateAnimation(0,
 endX, 0, 0);
 translateAnimationX.setInterpolator(new LinearInterpolator());
 translateAnimationX.setRepeatCount(0);// 动画重复执行的次数
 translateAnimationX.setFillAfter(true);
 
 TranslateAnimation translateAnimationY = new TranslateAnimation(0, 0,
 0, endY);
 translateAnimationY.setInterpolator(new AccelerateInterpolator());
 translateAnimationY.setRepeatCount(0);// 动画重复执行的次数
 translateAnimationX.setFillAfter(true);
 
 ScaleAnimation scaleAnimation = new ScaleAnimation(0.6f, 0.1f,0.6f, 0.1f);
 scaleAnimation.setInterpolator(new AccelerateInterpolator());
 scaleAnimation.setRepeatCount(0);// 动画重复执行的次数
 scaleAnimation.setFillAfter(true);
 
 AnimationSet set = new AnimationSet(false);
 set.setFillAfter(false);
 set.addAnimation(scaleAnimation);
 set.addAnimation(translateAnimationY);
 set.addAnimation(translateAnimationX);
 set.setDuration(600);// 动画的执行时间
 viewa.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) ((Activity) this).getWindow()
 .getDecorView();
 LinearLayout animLayout = new LinearLayout(this);
 LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
 LinearLayout.LayoutParams.MATCH_PARENT,
 LinearLayout.LayoutParams.MATCH_PARENT);
 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_CONTENT);
 lp.leftMargin = x;
 lp.topMargin = y;
 view.setLayoutParams(lp);
 return view;
 }
 
 /**
 * 将drawable对象进行指定大小的缩放
 * 
 * @param drawable
 * @param w
 * @param h
 * @return
 */
 public Drawable zoomDrawable(Drawable drawable, int w, int h) {
 int width = drawable.getIntrinsicWidth();
 int height = drawable.getIntrinsicHeight();
 Bitmap oldbmp = drawableToBitmap(drawable); // drawable 转换成 bitmap
 Matrix matrix = new Matrix(); // 创建操作图片用的 Matrix 对象
 float scaleWidth = ((float) w / width); // 计算缩放比例
 float scaleHeight = ((float) h / height);
 matrix.postScale(scaleWidth, scaleHeight); // 设置缩放比例
 Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,
 matrix, true); // 建立新的 bitmap ，其内容是对原 bitmap 的缩放后的图
 return new BitmapDrawable(newbmp); // 把 bitmap 转换成 drawable 并返回
 }
 
 /**
 * 将drawable 转换成 bitmap
 * 
 * @param drawable
 * @return
 */
 public Bitmap drawableToBitmap(Drawable drawable) {
 int width = drawable.getIntrinsicWidth(); // 取 drawable 的长宽
 int height = drawable.getIntrinsicHeight();
 Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
 : Bitmap.Config.RGB_565; // 取 drawable 的颜色格式
 Bitmap bitmap = Bitmap.createBitmap(width, height, config); // 建立对应
   // bitmap
 Canvas canvas = new Canvas(bitmap); // 建立对应 bitmap 的画布
 drawable.setBounds(0, 0, width, height);
 drawable.draw(canvas); // 把 drawable 内容画到画布中
 return bitmap;
 }
 
 // dp转换为像素px
 public static int dip2Px(Context context, float dp) {
 final float scale = context.getResources().getDisplayMetrics().density;
 return (int) (dp * scale + 0.5f);
 }
}