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文章 2024-07-31 来自：开发者社区

Android经典面试题之实战经验分享：如何简单实现App的前后台监听判断

本文首发于公众号“AntDream”，欢迎微信搜索“AntDream”或扫描文章底部二维码关注，和我一起每天进步一点点在Android中判断一个应用是否处于前台或后台，可以使用ActivityLifecycleCallbacks 和 ProcessLifecycleOwner。在Kotlin中，我们可以利用下面这些工具来实现这个功能。 ...

文章 2024-05-17 来自：开发者社区

Android高级开发面试题以及笞案整理，实战解析

4、Handler post方法原理? 5、Android消息机制的原理及源码解析 6、Handler都没搞懂，拿什么去跳槽啊? 7、Android Handler消息机制（解惑篇) 8、Android 消息机制二、Activity相关 1、启动模式以及使用场景? 2、onNewIntent0)和onConfigurationChange...

文章 2022-02-17 来自：开发者社区

Android: 今日头条屏幕适配的原理？ 1：首先计算出 density，计算公式：当前设备屏幕总宽度（单位为像素）/ 设计图总宽度（单位为 dp) = densitydensity 的意思就是 1 dp 占当前设备多少像素计算density 的原因：在布局文件中填写的是什么单位，最后都会被转化为 px，系统就是通过上面的方法，将你在项目中任何地方填写的单位都转换为 px 但是，今日头条适配方....

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更新时间 2024-08-01 12:41:29

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