MaterialIn.java 文件源码

public static void startAnimators(final View view, int startOffsetX, int startOffsetY, long delay) {
    if (view.getVisibility() == View.VISIBLE && view.getAlpha() != 0f) {
        view.clearAnimation();
        view.animate().cancel();
        final Resources res = view.getResources();
        final float endAlpha = view.getAlpha();
        final float endTranslateX = view.getTranslationX();
        final float endTranslateY = view.getTranslationY();
        view.setAlpha(0);
        final Animator fade = ObjectAnimator.ofFloat(view, View.ALPHA, endAlpha);
        fade.setDuration(res.getInteger(R.integer.material_in_fade_anim_duration));
        fade.setInterpolator(new AccelerateInterpolator());
        fade.setStartDelay(delay);
        fade.start();
        ViewPropertyAnimator slide = view.animate();
        if (startOffsetY != 0) {
            view.setTranslationY(startOffsetY);
            slide.translationY(endTranslateY);
        } else {
            view.setTranslationX(startOffsetX);
            slide.translationX(endTranslateX);
        }
        slide.setInterpolator(new DecelerateInterpolator(2));
        slide.setDuration(res.getInteger(R.integer.material_in_slide_anim_duration));
        slide.setStartDelay(delay);
        slide.setListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationCancel(Animator animation) {
                if (fade.isStarted()) {
                    fade.cancel();
                }
                view.setAlpha(endAlpha);
                view.setTranslationX(endTranslateX);
                view.setTranslationY(endTranslateY);
            }
        });
        slide.start();
    }
}