<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> 一个<span style="font-family:'Times New Roman',serif">MeasureSpec</span>封装了父布局传递给子布局的布局要求，每个<span style="font-family:'Times New Roman',serif">MeasureSpec</span>代表了一组宽度和高度的要求。一个<span style="font-family:'Times New Roman',serif">MeasureSpec</span>由大小和模式组成。它有三种模式：<span style="font-family:'Times New Roman',serif">UNSPECIFIED(</span>未指定<span style="font-family:'Times New Roman',serif">),</span>父元素部队自元素施加任何束缚，子元素可以得到任意想要的大小；<span style="font-family:'Times New Roman',serif">EXACTLY(</span>完全<span style="font-family:'Times New Roman',serif">)</span>，父元素决定自元素的确切大小，子元素将被限定在给定的边界里而忽略它本身大小；<span style="font-family:'Times New Roman',serif">AT_MOST(</span>至多<span style="font-family:'Times New Roman',serif">)</span>，子元素至多达到指定大小的值。</p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> </p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> 它常用的三个函数：</p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> <span style="font-family:'Times New Roman',serif"> 1.static int getMode(int measureSpec):</span>根据提供的测量值<span style="font-family:'Times New Roman',serif">(</span>格式<span style="font-family:'Times New Roman',serif">)</span>提取模式<span style="font-family:'Times New Roman',serif">(</span>上述三个模式之一<span style="font-family:'Times New Roman',serif">)</span></p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> <span style="font-family:'Times New Roman',serif"> 2.static int getSize(int measureSpec):</span>根据提供的测量值<span style="font-family:'Times New Roman',serif">(</span>格式<span style="font-family:'Times New Roman',serif">)</span>提取大小值<span style="font-family:'Times New Roman',serif">(</span>这个大小也就是我们通常所说的大小<span style="font-family:'Times New Roman',serif">)</span></p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> <span style="font-family:'Times New Roman',serif"> 3.static int makeMeasureSpec(int size,int mode):</span>根据提供的大小值和模式创建一个测量值<span style="font-family:'Times New Roman',serif">(</span>格式<span style="font-family:'Times New Roman',serif">)</span></p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> <span style="font-family:'Times New Roman',serif"><br> </span></p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> 这个类的使用呢，通常在<span style="font-family:'Times New Roman',serif">view</span>组件的<span style="font-family:'Times New Roman',serif">onMeasure</span>方法里面调用但也有少数例外，看看几个例子：</p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> </p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> a.首先一个我们常用到的一个有用的函数，<span style="font-family:'Times New Roman',serif">View.resolveSize(int size,int measureSpec)</span></p>
<p style="margin-top:10px; margin-right:auto; margin-left:auto; margin-bottom:0cm; font-family:Verdana,'Lucida Grande',Arial,Helvetica,sans-serif; line-height:18px"> </p>
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