【安卓】自定义基于onDraw的任意动画(不仅仅是平移/旋转/缩放/alpha)、！

来源：互联网发布：eval在js中编辑：程序博客网时间：2024/05/16 23:51

思路:

1.基于时间的显示映射。如:给定度数,显示圆弧,加上时序,即可有圆弧动画的效果

2.给定时序。用于驱动动画的一帧帧绘制

方案一、基于ObjectAnimator。动画运作时会调用degree对应set函数(基于放射调用),即setDegree。

ObjectAnimator ani=ObjectAnimator.ofInt(myView, "degree", 0,300);
ani.start();

注:1>混编后,默认会将setDegree混掉,导致找不到函数,故混编后这种机制会失效。解决方法是1.proguard中防止该段代码混编(具体方法百度) 2.使用方法二

2>ObjectAnimator在3.0后才支持,可使用NineOldAndroids库,效果完全一样。

方案二、仍然基于ObjectAnimator。但基于回调,这种方法未用到反射,故混编时仍ok

ObjectAnimator ani=ObjectAnimator.ofInt(myView, new Prop(), 0,300);
ani.start();

class Prop extends Property<View, Integer> {public Prop() {// TODO Auto-generated constructor stubsuper(Integer.class, "kk");}@Overridepublic void set(View object, Integer value) {// TODO Auto-generated method stub((MyView1)object).setDegree(value);}@Overridepublic Integer get(View object) {// TODO Auto-generated method stubreturn null;}};

方案三、用animation提供时序。interpolatedTime为0~1,即时间的百分比。

Animation ani=new Animation() {@Overrideprotected void applyTransformation(float interpolatedTime,Transformation t) {// TODO Auto-generated method stubmyView.setDegree((int)(interpolatedTime*300f));}};ani.setDuration(3000);myView.startAnimation(ani);

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自定义视图,setDegress可改变圆弧角度:

private class MyView1 extends ImageView {public int degree = 0;public MyView1(Context ct) {// TODO Auto-generated constructor stubsuper(ct);}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);Rect r = new Rect();getLocalVisibleRect(r);canvas.drawArc(new RectF(r), 0, degree, true, pt);}public void setDegree(int degree) {this.degree = degree;invalidate();}}

效果:

88 0