Activity四大启动方式生命周期

Standard 标准模式启动

android:launchMode=“standard”

归纳：直接在栈顶新建一个Activity进行启动

生命周期：

===>开启一个Activity

I/LifecycleActivity_A: onCreate:
I/LifecycleActivity_A: onStart:
I/LifecycleActivity_A: onResume:

===>退出

I/LifecycleActivity_A: onPause:
I/LifecycleActivity_A: onStop:
I/LifecycleActivity_A: onDestroy:

SingleTop 栈顶启动

manifest：android:launchMode=“singleTop”
FLAG：FLAG_ACTIVITY_SINGLE_TOP

归纳：当启动的Activity在栈顶时，则进行复用，如果栈顶没有时使用默认的Standard模式

生命周期：

===> 启动A：

A: onCreate:
A: onStart:
A: onResume:

===> 栈顶启动：

A: onPause:
A: onNewIntent:
A: onResume:

FLAG_ACTIVITY_CLEAR_TOP启动

栈顶复用不走newIntent（）， 将栈内的需要启动的activity移到最顶处启动，并将上面的activity全部出栈销毁。

===> 启动A FLAG_ACTIVITY_NEW_TASK

I/LifecycleActivity_A: onCreate:
I/LifecycleActivity_A: onStart:
I/LifecycleActivity_A: onResume:
I/LifecycleActivity_A: onPause:

===> 启动B FLAG_ACTIVITY_NEW_TASK

I/LifecycleActivity_A: onPause:
I/LifecycleActivity_B: onCreate:
I/LifecycleActivity_B: onStart:
I/LifecycleActivity_B: onResume:
I/LifecycleActivity_A: onStop:

===> 启动A FLAG_ACTIVITY_CLEAR_TOP

I/LifecycleActivity_B: onPause:
I/LifecycleActivity_A: onDestroy:
I/LifecycleActivity_A: onCreate:
I/LifecycleActivity_A: onStart:
I/LifecycleActivity_A: onResume:
I/LifecycleActivity_B: onStop:
I/LifecycleActivity_B: onDestroy:

===>A退出

I/LifecycleActivity_A: onPause:
I/LifecycleActivity_A: onStop:
I/LifecycleActivity_A: onDestroy:

SingleTask 栈内复用模式

android:launchMode=“singleTask”

归纳：当栈内有需要启动的Activity时，则将该Activity移动到栈顶，并在栈中这个activity顶部的activity全部出栈销毁。

生命周期：

===> 启动A：

A: onCreate:
A: onStart:
A: onResume:

===> 启动B：

A: onPause:
B: onCreate:
B: onStart:
B: onResume:
A: onStop:

===> 栈内启动A：

B: onPause:
A: onNewIntent:
A: onRestart:
A: onStart:
A: onResume:
B: onStop:
B: onDestroy:

FLAG_ACTIVITY_REORDER_TO_FRONT启动

===>启动A FLAG_ACTIVITY_NEW_TASK

I/LifecycleActivity_A: onCreate:
I/LifecycleActivity_A: onStart:
I/LifecycleActivity_A: onResume:

===> 启动B FLAG_ACTIVITY_NEW_TASK

I/LifecycleActivity_A: onPause:
I/LifecycleActivity_B: onCreate:
I/LifecycleActivity_B: onStart:
I/LifecycleActivity_B: onResume:
I/LifecycleActivity_A: onStop:

===> 启动A FLAG_ACTIVITY_REORDER_TO_FRONT

I/LifecycleActivity_B: onPause:
I/LifecycleActivity_A: onNewIntent:
I/LifecycleActivity_A: onRestart:
I/LifecycleActivity_A: onStart:
I/LifecycleActivity_A: onResume:
I/LifecycleActivity_B: onStop:

===>A退出

I/LifecycleActivity_A: onPause:
I/LifecycleActivity_B: onRestart:
I/LifecycleActivity_B: onStart:
I/LifecycleActivity_B: onResume:
I/LifecycleActivity_A: onStop:
I/LifecycleActivity_A: onDestroy:

===>B退出

I/LifecycleActivity_B: onPause:
I/LifecycleActivity_B: onStop:
I/LifecycleActivity_B: onDestroy:

SingleInstance 单例启动模式

android:launchMode=“singleinstance”

归纳：单独创建一个栈控件启动这个Activity，常用于启动壁纸，电话，闹钟等界面实现。

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