Android 自学之路（一）

Android

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路线图

• Android 应用开发
• Android 酷炫动效
• Android 安全
• Android 定制与移植

Android 资源索引

第三方库

1. DebugLog
2. SnappyDB
3. EventBus
4. Jsoup
5. SlideDateTimePicker
6. AndroidCharts
7. Boon - JSON
8. Fresco
9. Java-WebSocket

网络资源

1. Android 设计大赏
2. Quora - What are must-read Android developer blogs?
3. Web Services & API - 1
   Web Services & API - 2
   Web Services & API - 3
4. 国内 Android 大牛
5. Android开源项目分类汇总 - 国内组织
   Android开源项目分类汇总 - 国外组织
6. Google - Material Design Icons
   Google - material-design 规范
7. 花瓣 - 设计
   花瓣资源示例 - Loading
8. App 开发日报
9. AOSP
10. Android Gradle 插件使用手册

Android Cmd

Android Linux Kernel 主要的特定实现

KERNEL	CHANGE DESCRIPTION
Binder	IPC mechanism with additional features such as security validation of callers/callees; used by numerous system and framework services
ashmem	Anonymous Shared Memory; file-based shared memory allocator; uses Binder IPC to allow processes to identify memory region file descriptors
pmem	Process Memory Allocator; used for managing large, contiguous regions of shared memory
logger	System-wide logging facility
RAM_CONSOLE	Stores kernel log messages in RAM for viewing after a kernel panic
"oom" modifications	"Out of memory"-killer kills processes as memory runs low; in Android fork, OOM kills processes sooner than vanilla kernel, as memory is being depleted
wakelocks	Power management feature to keep a device from entering low-power state, and staying responsive
Alarm	Timers Kernel interface for AlarmManager, to instruct kernel to schedule “waking up”
Paranoid Networking	Restricts certain networking operations and features to speciic group IDs
timed output / gpio	Allows user-space programs to change and restore GPIO registers after a period of time
yaffs2	Support for the yaffs2 flash file system

Android 框架与 App. 简要进程视图

说明
框架
Process & Service
文件系统

关于架构设计

• 极简软件架构模式

• MVC、MVP、MVVM 模式

关于设计模式

• 极简设计模式索引贴

应用的五种状态

Rank	Description
Forground	a visible component in front, Service is bound to an Activity in front, or BroadcastReceiver is running
Visible	visible but is partly obscured( e.g. a dialog popup)
Service	Service is executing in the background and is not tied to a visible component
Background	A nonvisible Activity
Empty	without active components. Empty processes are kept around to improve startup times

Activity 和 Fragment 的生命周期

• Activity 的四种启动模式
  
  • standard、singleTop、singleTask、singleInstance
• onNewIntent 调用时机
  
  • 如果目标 Activity 处于任务栈的顶端， onStop -> onNewIntent -> onRestart -> onStart
• Android中保存和恢复Fragment状态的最好方法

其它一些主题

• 关于 task: Activity Stack -> Home Screen
  

• Service 组件的去留问题

  • 优先选择框架
  • 系统无需持久化时
  • 系统组件不超过2个
  • 无需向其它应用提供服务

• 关于尺寸计算
  

密度	取值
ldpi	160 dpi x 0.75
mdpi	160 dpi
hdpi	1.5 x 160 dpi = 240 dpi
xhdpi	2 x 160 dpi = 320 dpi
xxhdpi	3 x 160 dpi = 480 dpi
xxxhdpi	4 x 160 dpi = 640 dpi