Android测量-阿里云

Android Path测量工具：PathMeasure

PathMeasure是什么？顾名思义，PathMeasure是用来对Path进行测量的，一般PathMeasure是和Path配合使用的，通过PathMeasure，我们可以知道Path路径上某个点的坐标、Path的长度等等，如果对Path不了解，可以先看下这篇文章：Android Canvas之...

【Android 应用开发】Canvas 精准绘制文字 ( 测量文本真实边界 | 将文本中心点与给定中心点对齐 )

文章目录一、测量文本真实边界二、将文本中心点与给定中心点对齐一、测量文本真实边界Paint.getTextBounds() 函数原型如下 :public class Paint { /** * 检索文本边界框并存储到边界。 * * 在边界内返回（由调用方分配）包含所有字符的最小矩形，其隐含原点为（0...

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【Android 性能优化】布局渲染优化 ( CPU 渲染优化 | 减少布局的嵌套 | 测量布局绘制时间 | OnFrameMetricsAvailableListener | 布局渲染优化总结 )

文章目录一、减少布局嵌套二、布局渲染时间测量1. FrameMetrics 使用流程2. FrameMetrics 参数解析3. FrameMetrics 代码示例三、布局渲染优化总结一、减少布局嵌套在【Android 性能优化】布局渲染优化 ( GPU 过度绘制优化总结 | CPU 渲染...

【Android 性能优化】应用启动优化 ( 启动白屏问题 | 应用启动时间测量 | 冷启动 | 热启动 | 应用启动时间计算源码分析 )

文章目录一、 APP 启动白屏 / 黑屏二、 APP 启动速度测量1. 通过 Logcat 日志查看应用启动时间2. 通过 adb 命令查看界面启动时间三、 APP 冷启动与热启动四、 APP 启动时间计算一、 APP 启动白屏 / 黑屏1 . 问题描述 : Android 应用启动时 , 尤其是大...

【Android 应用开发】Canvas 绘制文字 ( 文字尺寸测量 | 基线绘制 )

文章目录I . 文字尺寸测量II . 基线绘制I . 文字尺寸测量1 . 精准绘制需求 : Canvas 绘制文字时 , 有时需要精准的控制文字的绘制 , 如绘制到指定的区域 , 居中 , 或者位于某个精准的坐标 ;2 . 精准测量 : 要实现精准绘制 , 必须对字符串绘制的区域有详细的测量 , 如...

Android测量View宽和高的一般通用方法

Android测量View宽和高的一般通用方法众所周知Android在onCreate里面如果直接对一个View进行getWidth，getHeight时候，得到到的值全部是0，这样拿不到View的宽和高的值，但有时候又必须在初始化阶段获取一个View的宽和高，现在给出一个基本的通用方法： int...

Android笔记:测量控件宽高和动态设置控件宽高

1.测算控件宽高初始化UI时,无法直接通过getWidth()或getHeight()获取到控件的宽度或高度。可采用定时测算去获取控件的宽度/高度,方法如下: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 //每隔10毫秒测算一次宽度,直到测...

Android摄像头测量尺（Advanced Ruler Pro）使用方法

dvanced Ruler Pro是一个Android手机应用程序，可以通过摄像头量出比手机尺寸大得多的物体的长度。它支持三种测量方式，距离、高度、长度，前两种都非常容易使用，长度测量比较难用一些。一、Distance Ruler 用距离尺测量房间的长：（1）测量自己站立时眼睛距离地面的高度（...

Android View 测量流程(Measure)完全解析

前言上一篇文章，笔者主要讲述了DecorView以及ViewRootImpl相关的作用，这里回顾一下上一章所说的内容：DecorView是视图的顶级View，我们添加的布局文件是它的一个子布局，而ViewRootImpl则负责渲染视图，它调用了一个performTraveals方法使得ViewTr...

Android view的测量及绘制

view的测量：　　首先需要知道的是view的三种测量模式：　　1、EXACTLY：精确值模式，当我们对view的layout_width和layout_height属性指定具体的数值的时候，比如layout_width=“100dp”或者指定为match_parent时，系统进行测量的时候，...

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更新时间 2023-04-22 15:02:41

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