0.基本
1>.sp用作字体的size,dp用做宽高。
1.简单的代码布局

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2.xml布局基本属性

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1>.线性布局

WechatIMG1.jpeg
2>.相对布局

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3>.FrameLayout 帧布局,层布局
4>.TableLayout
stretchColumns=“*” 所有列都伸展,则等宽平分一行;

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5>.网格布局

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6>.约束布局
<1>.基本布局属性

WechatIMG2.png
// 偏移0.5一般就是居中了

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<2>.inspector

WechatIMG3.jpeg
<3>.guideline

WechatIMG4.png

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