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,就可以有圆弧动画的效果
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相应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,故混编后这样的机制会失效。
解决方法是1.proguard中防止该段代码混编(详细方法百度) 2.用法二
2>ObjectAnimator在3.0后才支持,可使用NineOldAndroids库,效果全然一样。
方案二、仍然基于ObjectAnimator。但基于回调,这样的方法未用到反射,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 stub
super(Integer.class, "kk");
} @Override
public void set(View object, Integer value) {
// TODO Auto-generated method stub
((MyView1)object).setDegree(value);
} @Override
public Integer get(View object) {
// TODO Auto-generated method stub
return 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() {
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
// TODO Auto-generated method stub
myView.setDegree((int)(interpolatedTime*300f));
}
};
ani.setDuration(3000);
myView.startAnimation(ani);
//===========================================================================
自己定义视图,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 stub
super(ct); } @Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.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:
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