GridView.java 文件源码

@Override
protected void attachLayoutAnimationParameters(View child,
                                               ViewGroup.LayoutParams params, int index, int count) {

    GridLayoutAnimationController.AnimationParameters animationParams =
            (GridLayoutAnimationController.AnimationParameters) params.layoutAnimationParameters;

    if (animationParams == null) {
        animationParams = new GridLayoutAnimationController.AnimationParameters();
        params.layoutAnimationParameters = animationParams;
    }

    animationParams.count = count;
    animationParams.index = index;
    animationParams.columnsCount = mNumColumns;
    animationParams.rowsCount = count / mNumColumns;

    if (!mStackFromBottom) {
        animationParams.column = index % mNumColumns;
        animationParams.row = index / mNumColumns;
    } else {
        final int invertedIndex = count - 1 - index;

        animationParams.column = mNumColumns - 1 - (invertedIndex % mNumColumns);
        animationParams.row = animationParams.rowsCount - 1 - invertedIndex / mNumColumns;
    }
}