Android GridView设置条目的高度与宽度相等、GridView条目宽高相同(这个是设置后GridView Item的高度和宽度就会一样大)

自定义ViewGroup，继承RelativeLayout或者LinearLayout，重写onMeasure()方法,代码如下：

public class SquareLayout extends RelativeLayout {

    public SquareLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public SquareLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SquareLayout(Context context) {
        super(context);
    }


    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));

        int childWidthSize = getMeasuredWidth();
        int childHeightSize = getMeasuredHeight();

        heightMeasureSpec = widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

}