ItemDecoration随笔小计

public class SimpleItemDecoration extends RecyclerView.ItemDecoration {
    private Paint paint;
    private Context context;

    public SimpleItemDecoration(Context context) {
        this.context=context;
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(ContextCompat.getColor(context,R.color.colorDivider));
    }

    private int itemHeight;

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        itemHeight = (int) (1 * context.getResources().getDisplayMetrics().density);
        outRect.bottom = itemHeight;
    }

    @Override
    public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        super.onDraw(c, parent, state);
        float paddingLeftOrRight = 12.0f * context.getResources().getDisplayMetrics().density;
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount - 1; i++) {
            View view = parent.getChildAt(i);
            c.drawRect(view.getLeft() + paddingLeftOrRight,
                    view.getBottom(),
                    view.getRight() - paddingLeftOrRight,
                    view.getBottom() + itemHeight,
                    paint);
        }
    }
}