setAnimation设置了不播放动画？setAnimation与startAnimation的区

本文链接：https://blog.youkuaiyun.com/leafact/article/details/44758953

本文探讨了在Android中使用setAnimation与startAnimation进行动画操作的区别。setAnimation仅仅赋值，不会立即播放动画，而startAnimation则会启动指定的动画。理解两者的差异对于正确控制UI元素的动画效果至关重要。

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在自己写小游戏的时候，常常遇到一些很奇怪的问题，比如一个动画在模拟器上跑的很好，
但是在真机上却显示不出来，这让人很蛋疼，问了很多人，也没有得到很好的结果，后来才发现是自己用错方法了，
设置动画通常有setAnimation，但是还有一个方法很重要，startAnimation！
看下setAnimation方法的解释和源码
/**
     * Sets the next animation to play for this view.
     * If you want the animation to play immediately, use
     * {@link #startAnimation(android.view.animation.Animation)} instead.
     * This method provides allows fine-grained
     * control over the start time and invalidation, but you
     * must make sure that 1) the animation has a start time set, and
     * 2) the view's parent (which controls animations on its children)
     * will be invalidated when the animation is supposed to
     * start.
     *
     * @param animation The next animation, or null.
     */
    public void setAnimation(Animation animation) {
        mCurrentAnimation = animation;

        if (animation != null) {
            // If the screen is off assume the animation start time is now instead of
            // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time
            // would cause the animation to start when the screen turns back on
            if (mAttachInfo != null && mAttachInfo.mDisplayState == Display.STATE_OFF
                    && animation.getStartTime() == Animation.START_ON_FIRST_FRAME) {
                animation.setStartTime(AnimationUtils.currentAnimationTimeMillis());
            }
            animation.reset();
        }
    }

还有startAnimation

    /**
     * Start the specified animation now.
     *
     * @param animation the animation to start now
     */
    public void startAnimation(Animation animation) {
        animation.setStartTime(Animation.START_ON_FIRST_FRAME);
        setAnimation(animation);
        invalidateParentCaches();
        invalidate(true);
    }

从解释中我们可以看出，如果你想要动画立马执行，请使用startAnimation