Android GridView設定條目的高度與寬度相等、GridView條目寬高相同

自定義View，繼承RelativeLayout或者LinearLayout，重寫onMeasure()方法,程式碼如下：

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);
    }

}

在佈局中引入就可以了