AnimViewWrapper -- 对view动画的简单包装_if(mtargetset == null)-优快云博客

本文链接：https://blog.youkuaiyun.com/soybeen/article/details/86702801

本文介绍了一种方法，通过创建 AnimViewWrapper 对象，将多个视图的动画操作进行简化和通用化，以解决在处理大量视图动画时的繁琐问题。

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public class AnimViewWrapper<T extends View> {
    T mTarget;
    public static final int DIRECTION_TOP = 0x01;

    public static final int DIRECTION_BOTTOM = 0x02;

    public static final int DIRECTION_LEFT = 0x3;

    public static final int DIRECTION_RIGHT = 0x4;

    @IntDef({DIRECTION_TOP, DIRECTION_BOTTOM, DIRECTION_LEFT, DIRECTION_RIGHT})
    public @interface SlideAnim {

    }

    public AnimViewWrapper(T mTarget) {
        this.mTarget = mTarget;
    }

    /**
     * 滑动进入
     */
    public void slideIn(@SlideAnim int sileAnim, int duration, int delay) {
        if (mTarget == null) {
            return;
        }
        // 开始之前先取消当前的动画
        ViewPropertyAnimator animator = mTarget.animate();
        animator.cancel();
        mTarget.setAlpha(0F);
        animator.alpha(1F);
        switch (sileAnim) {
            case DIRECTION_TOP:
                mTarget.setTranslationY(-100);
                animator.translationY(0);
                break;
            case DIRECTION_BOTTOM:
                mTarget.setTranslationY(100);
                animator.translationY(0);
                break;
            case DIRECTION_RIGHT:
                mTarget.setTranslationX(500);
                animator.translationX(0);
                break;
            case DIRECTION_LEFT:
            default:
                mTarget.setTranslationX(-500);
                animator.translationX(0);
                break;

        }
        animator.setDuration(duration).setStartDelay(delay);
        animator.start();
    }

    /**
     * 消失动画
     */
    public void alphaOut(int duration) {
        if (mTarget == null) {
            return;
        }
        mTarget.setAlpha(1F);
        mTarget.setTranslationX(0);
        mTarget.setTranslationY(0);
        ViewPropertyAnimator animator = mTarget.animate();
        animator.cancel();
        animator.alpha(0).setDuration(duration).start();

    }

    /**
     * 左侧进入
     */
    public void sileFromLeft(int duration, int delay) {
        slideIn(DIRECTION_LEFT, duration, delay);

    }

    /**
     * 右侧进入
     */
    public void slideFromRight(int duration, int delay) {
        slideIn(DIRECTION_RIGHT, duration, delay);

    }

    /**
     * 从底部进入
     */
    public void slideFromBottom(int duration, int delay) {
        slideIn(DIRECTION_TOP, duration, delay);

    }

    public void slideFromTop(int duration, int delay) {
        slideIn(DIRECTION_BOTTOM, duration, delay);

    }

    public T getView() {
        return mTarget;
    }
}

今天想对一大堆view做动画，感觉特别麻烦，在想能不能写得通用一点，于是就用这种方式简单包装了一下