【高级UI】【004】MeasureSpec测量模式

命运之手发布时间：2021-10-11 11:03:22 ，浏览量：1

MeasureSpec是什么

在onMeasure等方法中，我们常会见到MeasureSpec这一个单词

它是一个整数，4字节32位，是对测量时具体条件的一个封装，它有mode和size两部分组成

MeasureSpec的前2位为mode，表示父控件对子控件的约束方式

MeasureSpec的后30位为size，存储参考的尺寸数值

MeasureSpec的计算方式


	public static class MeasureSpec {
	
	    public static final int MODE_SHIFT = 30;
	    public static final int MODE_MASK = 0B11


    
        
        
        
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