ItemViewHolder.java 文件源码

void setHintPanelVisible(boolean visible)
{
    final int visibility = hintPanel.getVisibility();
    boolean previousVisible = visibility == View.VISIBLE;
    if (previousVisible == visible)
    {
        return;
    }
    if (visible)
    {
        hintPanel.setVisibility(View.VISIBLE);
        final AlphaAnimation alphaAnimation = new AlphaAnimation(0.2f, 1.0f);
        alphaAnimation.setDuration(150);
        hintPanel.setAnimation(alphaAnimation);
        final RotateAnimation rotateAnimation = new RotateAnimation(
                -90, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        rotateAnimation.setDuration(500);
        arrow.startAnimation(rotateAnimation);
    }
    else
    {
        hintPanel.setVisibility(View.GONE);
    }
}