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Activities are one of the fundamental building blocks of apps on the Android platform. They serve as the entry point for a user's interaction with an app, and are also central to how a user navigates ...

继承关系：A ConstraintLayout is a ViewGroup which allows you to position and size widgets in a flexible way.ConstraintLayout是一个ViewGroup，它允许你以灵活的方式去定位和调整控件（的大小）。Note: ConstraintLayout is available as a sup...

This class represents the basic building block for user interface components. A View occupies a rectangular area on the screen and is responsible for drawing and event handling. View is the base class...

在win10上安装genymotion模拟器后无法启动，显示如下信息：解决方法如下：重启电脑。进入BIOS设置。（关于如何进入BIOS设置请自行百度）检查设置，并查找英特尔虚拟化技术（别名：英特尔VT-X）。    如下图：（win10在Security选项中可找到Virtualization Technology选项）4.将其设置为Enable，然后按F10保存退出即可。本人请测有效。相关链接：...

Tasks and Back Stack任务和返回栈A task is a collection of activities that users interact with when performing a certain job. The activities are arranged in a stack—the back stack)—in the order in which ...

由于工作需求，最近了解了一下Java8中的Predicate和Consumer接口，在此浅谈一下对它们的理解和使用：首先先来看一下Predicate官方文档解释：Represents a predicate (boolean-valued function) of one argument. This is a functional interface whose functional metho...

The Activity LifecycleActivity生命周期As a user navigates through, out of, and back to your app, the Activity instances in your app transition through different states in their lifecycle. The Activity cla...

原文地址：https://developer.android.google.cn/guide/topics/resources/localization.htmlLocalizing with Resources定位与资源Android runs on many devices in many regions. To reach the most users, your app should ha...

原文地址：https://developer.android.google.cn/guide/topics/resources/runtime-changes.html#HandlingTheChange处理运行时变更有些设备配置可能会在运行时发生变化（例如屏幕方向、键盘可用性及语言）。 发生这种变化时，Android 会重启正在运行的 Activity（先后调用 onDestroy() 和 on...

Activity State ChangesActivity状态改变Different events, some user-triggered and some system-triggered, can cause an Activity to transition from one state to another. This document describes some common ca...

Introduction to ActivitiesThe Activity class is a crucial component of an Android app, and the way activities are launched and put together is a fundamental part of the platform's application model. U...

added in API level 1Handlerpublic class Handler extends Object java.lang.Object    ↳ android.os.Handler Known direct subclasses AsyncQueryHandler, AsyncQueryHandler.WorkerHandler, Http...