android application 要点备忘 2

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component-->process->thead0

->thread1

->thread3

->thread2

(thread 启动顺序是未知的）

Anroid 生命周期：

void onCreate(Bundle savedInstanceState) -------------------------------------------------------------
void onRestart() ｜

void onStart() ------------------------------------------------------------------------------ ｜整个生命期
｜｜

void onResume() -----------------------                            可见（可能部分被覆盖）      ｜                     ｜
                                       前台运行    ｜                                                                 ｜                     ｜
void onPause() -------------------------                                                                  ｜                     ｜
void onStop() --------------------------------------------------------------------------------                       ｜
void onDestroy()---------------------------------------------------------------------/

A process with an active broadcast receiver is protected from being killed. But a process with only inactive components can be killed by the system at any time, when the memory it consumes is needed by other processes.这是因为进程是有重要等级的，有5个等级：

foreGround

visible process

service process

background process

empty process (用于process cache)

如果想不被轻易Kill，就生成比较“重要”的process. 如生成service