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Android自定义View-撸一个渐变的温度指示器(TmepView) - 品慧电子网

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By import android.content.Context, import android.graphics.Canvas, import android.graphics.Color, Mdefault TempHeight
| pinhui.wang
自定义View对需要对整个View体系,事件流程,绘制流程有深刻的理解,能绘制出复杂的图案和动画及交互效果,但万变不离其宗,都是通过确定大小,位置,绘制出相应的形状,由于项目的需要,自己绘制了一个渐变带指示器的温度条,本篇文章尽可能详细的一步一步来实现绘制的效果.(如果对自定义view有理解的,可以直接看最后源码,有详细的注释) 1.继承View 或ViewGroup 2.测量宽高,对应onMeasure来决定View的大小 3.布局(给控件指定位置),对应onLayout决定View在ViewGroup中的位置 4.绘制,对应onDraw,决定View的形状 注意 继承View 1、测量自己的宽高 onMeasure 2、绘制自己 onDraw 继承ViewGroup 1、测量子View和自己 onMeasure 2、布局，给子View设置位置 onLayout 2.1 onMeasure 用来确定当前view的宽高，并根据宽高等计算一些坐标默认的值 这里面需要了解的是MeasureSpec,封装了父布局传递给子布局的布局要求,每个MeasureSpec代表了一组宽度和高度的要求 .
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