How do I specify width and height of Android GridLayout cells in relative measures?

Question

I\'m trying to figure out how GridLayout works, but one thing I can\'t figure out from the documentation is how or if one can control the size of the grid cells.

Sa

Answer 1

There is a helper method inside the GridLayout:

GridLayout.LayoutParams params = new GridLayout.LayoutParams();
            params.columnSpec = GridLayout.spec(GridLayout.UNDEFINED, 1, getAlignment(Gravity.NO_GRAVITY, true), 1);
item.setLayoutParams(params);

private GridLayout.Alignment getAlignment(int gravity, boolean horizontal) {
        int mask = horizontal ? HORIZONTAL_GRAVITY_MASK : VERTICAL_GRAVITY_MASK;
        int shift = horizontal ? AXIS_X_SHIFT : AXIS_Y_SHIFT;
        int flags = (gravity & mask) >> shift;
        switch (flags) {
            case (AXIS_SPECIFIED | AXIS_PULL_BEFORE):
                return horizontal ? LEFT : TOP;
            case (AXIS_SPECIFIED | AXIS_PULL_AFTER):
                return horizontal ? RIGHT : BOTTOM;
            case (AXIS_SPECIFIED | AXIS_PULL_BEFORE | AXIS_PULL_AFTER):
                return FILL;
            case AXIS_SPECIFIED:
                return CENTER;
            case (AXIS_SPECIFIED | AXIS_PULL_BEFORE | GravityCompat.RELATIVE_LAYOUT_DIRECTION):
                return START;
            case (AXIS_SPECIFIED | AXIS_PULL_AFTER | GravityCompat.RELATIVE_LAYOUT_DIRECTION):
                return END;
            default:
                return GridLayout.FILL;
        }
    }

Normally this is only accessible thought reflection.

And the smaller version:

params.columnSpec = GridLayout.spec(GridLayout.UNDEFINED, 1, GridLayout.FILL, 1);