Android onMeasure-阿里云

android组件调用onMeasure时报空指针

android.view.View.measure(int widthMeasureSpec, int heightMeasureSpec)这个函数时，如果这个View是通过LayoutInflater来构建的，会报：java.lang.NullPointerExceptionat android....

Android onMeasure

Android onMeasure import android.content.Context; import android.graphics.Color; import android.support.annotation.Nullable; import android.util.Attri...

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Android开发实践：为什么要继承onMeasure()

首先，我们写一个自定义View，直接调用系统默认的onMeasure函数，看看会是怎样的现象： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 package com.titcktick.customview; ...

Android自定义视图四：定制onMeasure强制显示为方形

这个系列是老外写的，干货！翻译出来一起学习。如有不妥，不吝赐教！ Android自定义视图一：扩展现有的视图，添加新的XML属性 Android自定义视图二：如何绘制内容 Android自定义视图三：给自定义视图添加“流畅”的动画 Android自定义视图四：定制onMeasure强制显示为方形上...

Android -- onMeasure

onMeasure调用次数当Activity获取焦点的时候，它就需要绘制布局。Android框架会处理绘制过程，但这个Activity必须提供它布局树的根节点。绘制过程是从布局的根节点开始的。这个过程需要测量和绘制布局树。绘制过程是通过遍历树和渲染每个与绘制区域相交的视图来处理的。接下来，Vie...

Android横竖屏切换View设置不同尺寸或等比例缩放的自定义View的onMeasure解决方案（2）

Android横竖屏切换View设置不同尺寸或等比例缩放的自定义View的onMeasure解决方案（2）附录文章1以xml布局文件方式实现了一个view在横竖屏切换时候的大小尺寸缩放，实现这种需求，也可以使用自定义View的onMeasure方法实现。比如，写一个自定义的ScaleRelativ...

[Android Pro] Android开发实践：为什么要继承onMeasure()

reference to : http://www.linuxidc.com/Linux/2014-12/110164.htm Android开发中偶尔会用到自定义View，一般情况下，自定义View都需要继承View类的onMeasure方法，那么，为什么要继承onMeasure()函...

Android自定义ViewGroup：onMeasure与onLayout（1）

Android自定义ViewGroup：onMeasure与onLayout（1） Android自定义一个ViewGroup，需要重写ViewGrouo里面的两个最重要的回调函数onMeasure()与onLayout()。如果开发者自己摆脱Android为我们做好的几套布局（如常见的线1性布局、...

Android自定义控件在scrollview中设置高度不起作用，已经重写了 onMeasure方法

布局： android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true"> 自定义控件： protected void onMeasure(int width...

Android学习自定义View(五)——自定义ViewGroup及其onMeasure()的理解

MainActivity如下:package cc.testviewstudy5; import android.os.Bundle; import android.app.Activity; /** * Demo描述: * 自定义ViewGroup及其onMeasure()的理解 * * 参考资料...

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