Activity startup mode and life cycle measurement results

I am often asked by the interviewer during the interview activity Life cycle problems , However, we usually only have a brief understanding of the common , While the interviewer is always asking about the life cycle of exotic situations , So I wrote a demo, Carefully check the real situation and the results （ The most embarrassing thing is that the interviewer said , Go back and try ）

Activity Boot mode
standard： Create everything （ Default startup mode ）
singleTop： Not on top target Activity,new One
singleTask： Not on top target Activity, remove target Above , Turn yourself into top.
singleInstance： Open up private task, Other completely independent of the program activity Of task.

standard Pattern

One 、 Under normal circumstances, start a activity, Its life cycle ：(Activity_A Do a test )
1、 start-up ->back Key returns ：
onCreat()->onStart()->onResume()->onPause()->onStop()->onDestroy()

2、 start-up ->home desktop -> And on again app（ Without being killed ）：
onCreat()->onStart()->onResume()->onPause()->onStop()->onRestart()->onStart()->onResume()

singleTop Pattern

One 、 Under normal circumstances, start a activity, Its life cycle ：(Activity_B Do a test )
1、 start-up ->back Key returns ： The result is the same as standard Pattern
2、 start-up ->home desktop -> And on again app（ Without being killed ）： The result is the same as standard Pattern
3、 Already on top , Start your situation again ：
onCreat()->onStart()->onResume()->onPause()->onNewIntent()->onResume()->onPause()->onStop()->onDestroy()

4. There are already... In the stack , But not at the top ：

singleTask Pattern

One 、 Under normal circumstances, start a activity, Its life cycle ：(Activity_B Do a test )
1、 start-up ->back Key returns ： The result is the same as standard Pattern
2、 start-up ->home desktop -> And on again app（ Without being killed ）： The result is the same as standard Pattern
3、 Already on top , Start your situation again ： The result is the same as singleTop Pattern
4. There are already... In the stack , But not at the top ：

singleInstance Pattern

One 、 Under normal circumstances, start a activity, Its life cycle ：(Activity_B Do a test )
1、 start-up ->back Key returns ： The result is the same as standard Pattern
2、 start-up ->home desktop -> And on again app（ Without being killed ）： The result is the same as standard Pattern
3、 Already on top , Start your situation again ： The result is the same as singleTop Pattern

4. There are already... In the stack , But not at the top ： The result is the same as singleTask Pattern

Activity A start-up B Then return A A and B Life cycle changes of （ The order ）