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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