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背景：如何在onCreate()中获取View的宽高？在某些场景下，需要我们在Activity的onCreate()中获取View的宽高，如果直接通过getMeasuredHeight()、getMeasuredWidth()去获取，得到的值都是0：2022-11-14 16:56:42.604 E...

Android自定义控件 | View绘制原理（画什么？）

View绘制就好比画画，抛开Android概念，如果要画一张图，首先会想到哪几个基本问题：画多大?画在哪？怎么画？Android绘制系统也是按照这个思路对View进行绘制，上面这些问题的答案分别藏在：测量（measure）定位（layout）绘制（draw）这一篇将从源码的角度分析“绘制（draw）...

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Android自定义控件 | View绘制原理（画在哪？）

View绘制就好比画画，抛开Android概念，如果要画一张图，首先会想到哪几个基本问题：画多大?画在哪？怎么画？Android绘制系统也是按照这个思路对View进行绘制，上面这些问题的答案分别藏在：测量（measure）定位（layout）绘制（draw）这一篇将从源码的角度分析“定位（layou...

Android自定义控件 | View绘制原理（画多大？）

View绘制就好比画画，抛开Android概念，如果要画一张图，首先会想到哪几个基本问题：画多大?画在哪？怎么画？Android绘制系统也是按照这个思路对View进行绘制，上面这些问题的答案分别藏在测量（measure）定位（layout）绘制（draw）这一篇将以源码中的几个关键函数为线索分析“测...

[帮助文档] 如何自定义Android小程序的View

说明：Android 小程序的自定义 View 功能仅在 mPaaS 10.1.68.29 及以上版本中支持。说明升级基线参考 mPaaS 升级指南升级基线版本至 10.1.68.29 及以上，并添加小程序组件至工程。mPaaS 升级指南使用定制的 appx 基础库，代码示例如下： depende...

[帮助文档] 如何自定义View的渲染参数

说明：Android 小程序自定义 View 自定义渲染参数功能仅在 mPaaS 10.1.68.29 及以上版本中支持。当前使用的基线版本低于 10.1.68.29 时，可参考 mPaaS 升级指南升级基线版本至 10.1.68.29。说明mPaaS 升级指南小程序标签内添加自定义渲染参数

[帮助文档] Android小程序如何发送自定义消息

说明：Android 小程序发送自定义消息至自定义 View 功能仅在 mPaaS 10.1.68.29 及以上版本中支持。当前使用的基线版本低于 10.1.68.29 时，可参考 mPaaS 升级指南升级基线版本至 10.1.68.29。说明mPaaS 升级指南创建自定义 View contex...

[帮助文档] 如何发送自定义事件至小程序

说明：Android 自定义 View 发送自定义事件至小程序功能仅在 mPaaS 10.1.68.29 及以上版本中支持。当前使用的基线版本低于 10.1.68.29 时，可参考 mPaaS 升级指南升级基线版本至 10.1.68.29。说明mPaaS 升级指南在小程序标签内增加自定义事件回调在...

03.Android之View原理问题

目录介绍 3.0.0.1 View的绘制需要经过哪些过程？有哪些常用回调方法？View的绘制流程的详细流程是怎样的？ 3.0.0.2 View绘制流程，当一个TextView的实例调用setText()方法后执行了什么？请说一下原理…… 3.0.0.3 requestLayout()、invalid...

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