Activity 在横竖屏切换情况下的生命周期变化
title: Activity 在横竖屏切换情况下的生命周期变化
date: 2018-04-26 23:05:57
tags: [Activity]
categories: [Mobile,Android]
概述
Activity 在横竖屏切换的时候,生命周期是不一样的,本地通过打印 log 的方式,看下区别.测试的机器是 Android6.0 .
不做任何配置的情况下
第一次启动
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [null]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@de950fc
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onResume() called
第一次切换成横屏
D/LifeCircleActivity: onPause() called
D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onStop() called
D/LifeCircleActivity: onDestroy() called
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@266fbfb
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onResume() called
再切换成竖屏
D/LifeCircleActivity: onPause() called
D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onStop() called
D/LifeCircleActivity: onDestroy() called
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@7e6e82e
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onResume() called
小结
默认情况下，每次旋转屏幕都会销毁当前的Activity对象，同时调用 onSaveInstanceState 方法，保存当前的界面状态；之后重新创建 Activity对象， onCreate 参数不为空，回调 onRestoreInstanceState 方法进行恢复。
配置 configChanges="orientation"
第一次启动
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [null]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@de950fc
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onResume() called
第一次切换成横屏
D/LifeCircleActivity: onPause() called
D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onStop() called
D/LifeCircleActivity: onDestroy() called
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@266fbfb
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onResume() called
再切换成竖屏
D/LifeCircleActivity: onPause() called
D/LifeCircleActivity: onSaveInstanceState() called with: outState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onStop() called
D/LifeCircleActivity: onDestroy() called
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@7e6e82e
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onRestoreInstanceState() called with: savedInstanceState = [Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@80a47f5, 2131296581=android.view.AbsSavedState$1@80a47f5, 2131296815=android.view.AbsSavedState$1@80a47f5}}], key=x}]]
D/LifeCircleActivity: onResume() called
小结
配置 orientation 的情况下，和默认情况一致。
配置 configChanges="orientation|screenSize"
根据官方的介绍，这个两个值，在api大于13 之后，应该一起使用
第一次启动
D/LifeCircleActivity: onCreate() called with: savedInstanceState = [null]Activity对象的地址:cn.steve.activitylifecycle.LifeCircleActivity@de950fc
D/LifeCircleActivity: onStart() called
D/LifeCircleActivity: onResume() called
第一次切换成横屏
D/LifeCircleActivity: onConfigurationChanged() called with: newConfig = [{1.0 ?mcc?mnc zh_CN ldltr sw360dp w640dp h336dp 320dpi nrml long land finger -keyb/v/h -nav/h s.11 themeChanged=0 themeChangedFlags=0}]
再切换成竖屏
D/LifeCircleActivity: onConfigurationChanged() called with: newConfig = [{1.0 ?mcc?mnc zh_CN ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.12 themeChanged=0 themeChangedFlags=0}]
小结
当配置了 screenSize 。则不会再销毁重建了，而是回调 onConfigurationChanged 方法。
总结
在不做配置默认的情况下,Activity 是被销毁,然后重新启动的.但是在 manifest 中进行相应的配置之后,就表示 Activity 自行处理配置的更改,将阻止 Activity 的销毁重新启动,而是保持运行状态,并且回调 onConfigurationChanged 方法.官方的建议是万不得已的情况下才能使用.
参考
Activity 在横竖屏切换情况下的生命周期变化的更多相关文章
- android activity在横竖屏切换的时候不重新调用onCreate方法
在安卓系统中,横竖屏切换会默认重新调用onCreate等生命周期方法,如果此时有一些临时数据没有保存下来,很有可能会导致该数据丢失. 因此我们可以进行以下设置,来避免恒切换时重新调用onCreate方 ...
- android 横竖屏切换不重走生命周期
android在系统配置发生改变时,Activity会被重新创建,但是某些情况下我们希望系统配置改变时不会重新创建Activity,这个时候我们可以给Activity指定相对应的configChang ...
- Android学习记录（8）—Activity的四种加载模式及有关Activity横竖屏切换的问题
Activity有四种加载模式:standard(默认), singleTop, singleTask和 singleInstance.以下逐一举例说明他们的区别: standard:Activity ...
- Activity嵌套多个Fragment实现横竖屏切换
一.上图 二.需求 最近项目遇到个横竖屏切换的问题.较为复杂.在此记之. 1.Activity中竖屏嵌套3个Fragment,本文简称竖屏FP1,FP2,FP3. 2.当中竖屏FP1与FP2能够切换为 ...
- Android APP 简单高效的禁用横竖屏切换
默认情况下,Android APP的界面会随着手机方向的改变而改变,当手机处于竖屏状态,APP的界面也处于竖屏状态,而当手机处于横屏状态,APP也会自动切换到横屏状态.一般情况下APP的界面都是为竖屏 ...
- Android应用：横竖屏切换总结
眨眼间,已经到了2016你年春节前,离上一篇博客的时间已经有6个月多,回想起这半年的种种,不得不说,学习和工作实在是太忙了,或许这就是程序员的真实写照吧. 写博客之初,主要的目的还是为了把自己的学习痕 ...
- Android横竖屏切换重载问题与小结
(转自:http://www.cnblogs.com/franksunny/p/3714442.html) (老样子,图片啥的详细文档,可以下载后观看 http://files.cnblogs.com ...
- Android 横竖屏切换小结
(自己体会:每次横竖屏自动切时都会run Activity的onCreate,即相当后重新进入Activity初始化一样:) 转自:http://www.cnblogs.com/franksunny/ ...
- Android横竖屏切换小结
Android横竖屏切换小结 (老样子,图片啥的详细文档,可以下载后观看 http://files.cnblogs.com/franksunny/635350788930000000.pdf) And ...
随机推荐
- cmd命令操作Mysql数据库
在一次考试中,笔者因考试的电脑上没有安装操作Mysql数据库的可视化工具而不知如何操作数据库,所以在这里可以提醒各位掌握 命令行来操作数据库也是非常重要的. 笔者以惨痛的教训来警惕大家. 进入正题: ...
- js数组的处理使用
var users = [ {name: "张含韵", "email": "zhang@email.com"}, {name: " ...
- MongoDB Linux安装
MongoDB 提供了 linux 各发行版本 64 位的安装包,你可以在官网下载安装包. 下载地址:https://www.mongodb.com/download-center#community ...
- vue搭建项目
vue-cli 作用:快速搭建项目脚手架 安装3.0:npm i -g @vue/cli 安装桥接工具:npm i -g @vue/cli-init (vue-cli 3和旧版使用相同的命令,所以2被 ...
- 20155210潘滢昊 2016-2017-2 《Java程序设计》第4周学习总结
20155210 2016-2017-2 <Java程序设计>第4周学习总结 教材学习内容总结 extends:单一继承. 抽象方法.抽象类: abstract:Java中有抽象方法的类一 ...
- 2017-2018-1 20155327 《信息安全系统设计基础》课堂测试&课下作业
2017-2018-1 20155327 <信息安全系统设计基础>课堂测试&课下作业 学习使用stat(1),并用C语言实现 提交学习stat(1)的截图 man -k ,grep ...
- adb的配置
http://jingyan.baidu.com/article/2fb0ba405e815f00f2ec5f9e.html 1. 用快捷键Ctrl + Alt + T 打开终端命令工具,电脑不要插入 ...
- BZOJ2140_稳定婚姻_KEY
题目传送门 暴力直接对于每个点跑一遍二分图匹配,能拿四十分. 然而我们考虑正解. 对于一对Couple我们建♂->♀的一条边,对于一对曾经有恋情的情侣我们建♀->♂的一条边. 跑Tarja ...
- day2 HTML - body
<body>内常用标签 1.基本标签 所有标签分为: # 块级标签: div(白板),H系列(加大加粗),p标签(段落和段落之间有间距) # 行内标签: span(白板) 1. 图标, ...
- HBase 第四章 HBase原理
1 体系图 HBase中的每张表都通过行键按照一定的范围被分割成多个子表(HRegion),默认一个HRegion超过256M就要被分割成两个,这个过程由HRegionServer管理,而HRegi ...