请问：简书怎么可以把代码格式调整？我贴出来换格式了。你们直接去Github下载工程！
分析动画
首先分析动画，初始状态是由两个相切的圆形图案组成。 将动画拆解为两部分看。
假象：表面看是旋转，其实是移动导致视觉差
1.中间，先往左边，然后往右边到中心点。然后切换颜色
中间，先往右边，然后往左边到中心点，切换颜色
2.同第一步相同，只是两小球变换位置。
具体实现
1.绘制蓝色小球，绘制红色小球。防止在中心的位置
2.蓝色小球位移和缩放动画
3.相交的部分变黑：
```
注意地方
1.小圆的绘制
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float cx = getWidth()/2;//对于控件来说
float cy = getHeight()/2;
canvas.drawCircle(cx, cy, 30, paint);
}
2.位置的放置
RelativeLayout.LayoutParams layoutParams =new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.addRule(CENTER_IN_PARENT);//设置位置居中
circleViewRedLeft =new CircleView(getContext());
circleViewBlueRight =new CircleView(getContext());
addView(circleViewRedLeft, layoutParams);
addView(circleViewBlueRight, layoutParams);
3.移动动画
ObjectAnimator animatorleft = ObjectAnimator.ofFloat(circleViewRedLeft, "translationX", 0, -translationX);//left move
ObjectAnimator animatorRight = ObjectAnimator.ofFloat(circleViewBlueRight, "translationX", 0, translationX);
4.ValueAnimator和ObjectAnimator 区别：
ObjectAnimator ：可以设置是旋转，移动，和arg
ValueAnimator不能设置这，只能设置值！主要应用：通过监听得到value。然后进行绘制
```
具体代码：
```
具体代码：
public class DouYinLayoutextends RelativeLayout {
public DouYinLayout(Context context) {
this(context, null);
}
public DouYinLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
init();
}
public DouYinLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
private CircleViewcircleViewRedLeft, circleViewBlueRight;
private float translationX =30;
/**
* 把2个点添加进去
*/
private void init() {
RelativeLayout.LayoutParams layoutParams =new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.addRule(CENTER_IN_PARENT);//设置位置居中
circleViewRedLeft =new CircleView(getContext());
circleViewBlueRight =new CircleView(getContext());
addView(circleViewRedLeft, layoutParams);
addView(circleViewBlueRight, layoutParams);
circleViewRedLeft.changeCorlor(Color.RED);
circleViewBlueRight.changeCorlor(Color.BLUE);
oneAnimation();
}
private void oneAnimation() {
//动起来：中间的先向左移动。然后向右移动。然后不停的循环
ObjectAnimator animatorleft = ObjectAnimator.ofFloat(circleViewRedLeft, "translationX", 0, -translationX);//left move
ObjectAnimator animatorRight = ObjectAnimator.ofFloat(circleViewBlueRight, "translationX", 0, translationX);
AnimatorSet animatorSet =new AnimatorSet();
animatorSet.playTogether(animatorleft, animatorRight);
animatorSet.setDuration(300);//
animatorSet.start();
animatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
circleViewRedLeft.changeCorlor(Color.BLUE);
circleViewBlueRight.changeCorlor(Color.RED);
twoAnimation();
}
});
}
private void twoAnimation() {
ObjectAnimator animatorleft = ObjectAnimator.ofFloat(circleViewRedLeft, "translationX", -translationX, 0);//left move
ObjectAnimator animatorRight = ObjectAnimator.ofFloat(circleViewBlueRight, "translationX", translationX, 0);
AnimatorSet animatorSet =new AnimatorSet();
animatorSet.playTogether(animatorleft, animatorRight);
animatorSet.setDuration(300);//
animatorSet.start();
animatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
circleViewRedLeft.changeCorlor(Color.RED);
circleViewBlueRight.changeCorlor(Color.BLUE);
oneAnimation();
}
});
}
}
```
动画的两种实现：setX跟setTranslationX区别
Canvas.save()跟Canvas.restore()的调用时机
区别Animation和Animator的用法，概述其原理
动画优化总结
1.在setVivible的时候，去移除一些view和图片
2.在ondestory的时候，取消动画等
3.动画的类，不要循环创建变量。因为动画是循环的！！
4.过渡绘制，最主要的就是背景多重复制了
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