高仿饿了么加减动画

效果

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分析

1.初始addView、subView、numView都在父布局的right

 @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int count = getChildCount();
        for (int i = 0; i < count; i++) {
            View view = getChildAt(i);
            view.layout(width - view.getMeasuredWidth(), height / 2 - view.getMeasuredHeight() / 2, width, height / 2 + view.getMeasuredHeight() / 2);
        }
    }

2.开始动画

subView

• TranslationX:right->left
• Rotation:0->-360
• Alpha:0->1
• ScaleX:->0.1->1
• ScaleY:->0.1->1

        ObjectAnimator subTranslation = ObjectAnimator.ofFloat(btnSub, "TranslationX", 0, (width - btnSub.getMeasuredWidth()) * -1f);
        ObjectAnimator subRotation = ObjectAnimator.ofFloat(btnSub, "Rotation", 0, -360);
        ObjectAnimator subAlpha = ObjectAnimator.ofFloat(btnSub, "Alpha", 0, 1f);
        ObjectAnimator subScaleX = ObjectAnimator.ofFloat(btnSub, "ScaleX", 0.1f, 1f);
        ObjectAnimator subScaleY = ObjectAnimator.ofFloat(btnSub, "ScaleY", 0.1f, 1f);

numView

• TranslationX:right->center
• Rotation:0->-360
• Alpha:0->1
• ScaleX:->0.1->1
• ScaleY:->0.1->1

        ObjectAnimator numberTranslation = ObjectAnimator.ofFloat(textNumber, "TranslationX", 0, (width - textNumber.getMeasuredWidth()) / -2f);
        ObjectAnimator numberRotation = ObjectAnimator.ofFloat(textNumber, "Rotation", 0, -360);
        ObjectAnimator numberAlpha = ObjectAnimator.ofFloat(textNumber, "Alpha", 0, 1f);
        ObjectAnimator numberScaleX = ObjectAnimator.ofFloat(textNumber, "ScaleX", 0.1f, 1f);
        ObjectAnimator numberScaleY = ObjectAnimator.ofFloat(textNumber, "ScaleY", 0.1f, 1f);

组合

        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.setInterpolator(new LinearInterpolator());
        animatorSet.playTogether(numberTranslation, numberRotation, numberAlpha, numberScaleX, numberScaleY,
                subTranslation, subRotation, subAlpha, subScaleX, subScaleY);
        animatorSet.setDuration(duration);
        animatorSet.setStartDelay(startDelay);
        animatorSet.start();

3.结束动画与开始相反

动画结束后要改变textview的值并且取消动画监听。

        btnSub.clearAnimation();
        ObjectAnimator subTranslation = ObjectAnimator.ofFloat(btnSub, "TranslationX", (width - btnSub.getMeasuredWidth()) * -1f, 0);
        ObjectAnimator subRotation = ObjectAnimator.ofFloat(btnSub, "Rotation", 360, 0);
        ObjectAnimator subAlpha = ObjectAnimator.ofFloat(btnSub, "Alpha", 1f, 0);
        ObjectAnimator subScaleX = ObjectAnimator.ofFloat(btnSub, "ScaleX", 1f, 0.1f);
        ObjectAnimator subScaleY = ObjectAnimator.ofFloat(btnSub, "ScaleY", 1f, 0.1f);

        textNumber.clearAnimation();
        ObjectAnimator numberTranslation = ObjectAnimator.ofFloat(textNumber, "TranslationX", (width - textNumber.getMeasuredWidth()) / -2f, 0);
        ObjectAnimator numberRotation = ObjectAnimator.ofFloat(textNumber, "Rotation", 360, 0);
        ObjectAnimator numberAlpha = ObjectAnimator.ofFloat(textNumber, "Alpha", 1f, 0);
        ObjectAnimator numberScaleX = ObjectAnimator.ofFloat(textNumber, "ScaleX", 1f, 0.1f);
        ObjectAnimator numberScaleY = ObjectAnimator.ofFloat(textNumber, "ScaleY", 1f, 0.1f);

        final AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.setInterpolator(new LinearInterpolator());
        animatorSet.playTogether(numberTranslation, numberRotation, numberAlpha, numberScaleX, numberScaleY,
                subTranslation, subRotation, subAlpha, subScaleX, subScaleY);
        animatorSet.setDuration(duration);
        animatorSet.setStartDelay(startDelay);
        animatorSet.start();
        animatorSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                textNumber.setText(String.valueOf(number));
                animatorSet.removeAllListeners();
            }
        });

方法

• 获取number
  public int getNumber()
• 接口 isAdd: true代表点击+，false代表点击-，number为当前值

public void setListener(OnChangeListener listener) {
             this.listener = listener;
         }

         public interface OnChangeListener {
             void onChange(boolean isAdd, int number);
         }

GitHub

GitHub