免费网站建设专业的公司,智能建造师报名入口官网,动易学校网站系统,pr免费模板网站2019独角兽企业重金招聘Python工程师标准 看了ApiDemo里面的BoucingBall#xff0c;觉得挺好的#xff0c;所以特地学习了一下#xff0c;将代码注释后贴到这里#xff0c;以便以后学习。 class BallView extends View implements ValueAnimator.AnimatorUpd… 2019独角兽企业重金招聘Python工程师标准 看了ApiDemo里面的BoucingBall觉得挺好的所以特地学习了一下将代码注释后贴到这里以便以后学习。 class BallView extends View implements ValueAnimator.AnimatorUpdateListener{private static final int RED 0xffFF8080;private static final int BLUE 0xff8080FF;private static final int CYAN 0xff80ffff;private static final int GREEN 0xff80ff80;private ArrayListShapeHolder balls new ArrayListShapeHolder();public BallView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stub}public BallView(Context context) {this(context, null);}public BallView(Context context, AttributeSet attrs) {super(context, attrs);//自定义View的背景切换动画ValueAnimator colorAnim ObjectAnimator.ofInt(this,backgroundColor, RED, BLUE,CYAN,GREEN);colorAnim.setDuration(3000L);colorAnim.setEvaluator(new ArgbEvaluator());colorAnim.setRepeatCount(ValueAnimator.INFINITE);colorAnim.setRepeatMode(ValueAnimator.REVERSE);colorAnim.start();}Overrideprotected void onDraw(Canvas canvas) {//在画布上绘制图形for(ShapeHolder holder:balls){canvas.save();canvas.translate(holder.getX(), holder.getY());holder.getmShapeDrawable().draw(canvas);canvas.restore();}}Overridepublic boolean onTouchEvent(MotionEvent event) {if (event.getAction() ! MotionEvent.ACTION_DOWN event.getAction() ! MotionEvent.ACTION_MOVE) {return false;}ShapeHolder newBall addBall(event.getX(), event.getY());float startY newBall.getY();float endY getHeight() - 50f;float h getHeight();float eventy event.getY();int duration (int) (500 * ((h - eventy) / h));//设置加速掉落的效果ValueAnimator bounceAnim ObjectAnimator.ofFloat(newBall, y,startY, endY);bounceAnim.setDuration(duration);bounceAnim.setInterpolator(new AccelerateInterpolator());//当掉落到底部的时候球体压扁高度降低ValueAnimator squashAnim1 ObjectAnimator.ofFloat(newBall, x,newBall.getX(), newBall.getX() - 25);squashAnim1.setDuration(duration /4);squashAnim1.setRepeatCount(1);squashAnim1.setRepeatMode(ValueAnimator.REVERSE);squashAnim1.setInterpolator(new DecelerateInterpolator());ValueAnimator squashAnim2 ObjectAnimator.ofFloat(newBall,width, newBall.getWidth(), newBall.getWidth() 50);squashAnim2.setDuration(duration /4);squashAnim2.setRepeatCount(1);squashAnim2.setRepeatMode(ValueAnimator.REVERSE);squashAnim2.setInterpolator(new DecelerateInterpolator());ValueAnimator strechAnim1 ObjectAnimator.ofFloat(newBall, y,endY, endY 25);strechAnim1.setDuration(duration /4);strechAnim1.setRepeatCount(1);strechAnim1.setRepeatMode(ValueAnimator.REVERSE);strechAnim1.setInterpolator(new DecelerateInterpolator());ValueAnimator strechAnim2 ObjectAnimator.ofFloat(newBall,height,newBall.getHeight(), newBall.getHeight() - 25);strechAnim2.setDuration(duration /4);strechAnim2.setRepeatCount(1);strechAnim2.setRepeatMode(ValueAnimator.REVERSE);strechAnim2.setInterpolator(new DecelerateInterpolator());ValueAnimator bounceBack ObjectAnimator.ofFloat(newBall, y,endY, startY25);bounceBack.setDuration(duration);bounceAnim.setInterpolator(new DecelerateInterpolator());AnimatorSet set new AnimatorSet();set.play(bounceAnim).before(squashAnim1);set.play(squashAnim1).with(squashAnim2);set.play(squashAnim1).with(strechAnim1);set.play(squashAnim1).with(strechAnim2);set.play(bounceBack).after(strechAnim2);//逐渐消失ValueAnimator fadeAnimator ObjectAnimator.ofFloat(newBall,alpha, 1F, 0F);fadeAnimator.setDuration(600L);fadeAnimator.addListener(new AnimatorListenerAdapter() {Overridepublic void onAnimationEnd(Animator animation) {// TODO Auto-generated method stubballs.remove(((ObjectAnimator) animation).getTarget());}});AnimatorSet animationSet new AnimatorSet();animationSet.play(set).before(fadeAnimator);animationSet.start();return true;}/*** 生成一个球* param x* param y* return*/public ShapeHolder addBall(float x, float y) {// 构造一个圆形的图案OvalShape oval new OvalShape();oval.resize(50f, 50f);ShapeDrawable draw new ShapeDrawable(oval);ShapeHolder holder new ShapeHolder(draw);holder.setX(x - 25);holder.setY(y - 25);int red (int) (Math.random() * 255);int green (int) (Math.random() * 255);int blue (int) (Math.random() * 255);int color 0xff000000 | red 16 | green 8 | blue;int darkColor 0xff000000 | red / 4 16 | green / 4 8 | blue/ 4;Paint paint draw.getPaint();RadialGradient gradient new RadialGradient(12.5f, 12.5f, 50f,color, darkColor, Shader.TileMode.CLAMP);paint.setShader(gradient);holder.setmRadialGradient(gradient);holder.setmPaint(paint);balls.add(holder);return holder;}Overridepublic void onAnimationUpdate(ValueAnimator animation) {// TODO Auto-generated method stubinvalidate();}
} 转载于:https://my.oschina.net/fengcunhan/blog/52763
