Android抛物线下载动画制作过程

下载动画经常出现在下载需求多的app中，比如游戏下载平台，应用市场……

先看看效果图：

实现

private void startAnim() {
  //以bitmap创建new ImageView
  iv.setDrawingCacheEnabled(true);
  Bitmap bitmap = iv.getDrawingCache();
  ImageView logo = new ImageView(this);
  logo.setScaleType(ImageView.ScaleType.FIT_XY);
  logo.setImageBitmap(bitmap);
  int[] startLocation = new int[2];
  iv.getLocationInWindow(startLocation);
  end.getLocationInWindow(location_download);
  setAnim(logo, startLocation, location_download);
}

设置动画

private void setAnim(final ImageView logo, int[] startLocation,int[] location_download) {
 ViewGroup animMaskLayout = createAnimLayout();
 animMaskLayout.addView(logo);// 把动画小球添加到动画层
 // 计算位移
 final View view = addViewToAnimLayout(logo, startLocation);
 // 动画位移的X坐标
 int endY = location_download[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);  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 Animation.AnimationListener() {
    // 动画的开始
    @Override
    public void onAnimationStart(Animation animation) {
       logo.setVisibility(View.VISIBLE);
   }
   @Override
   public void onAnimationRepeat(Animation animation) {
   }
   // 动画的结束
   @Override
   public void onAnimationEnd(Animation animation) {
       logo.setVisibility(View.GONE);
   }
  });
}

创建动画父布局

private ViewGroup createAnimLayout() {
  ViewGroup rootView = (ViewGroup) 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;
}

设置动画布局参数

private static View addViewToAnimLayout(final View view, int[] location) {
 int x = location[0];
 int y = location[1];
 LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(80, 80);
 lp.leftMargin = x;
 lp.topMargin = y;
 view.setLayoutParams(lp);
 return view;
}

代码就到此结束了，看起来并不难，动手试试吧。

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