Incomplete summary of Android Studio operations

write

Define variables

Special variable definition can be like thispsfi + ↩psfs + ↩

cycle

.forIs such that

.foriIs such that

.forrIs such that

数字.forIs such that

Judge (not) empty

.null

.notnull

More.nn

if

.if 

Method extraction

hot keyOption + Command + M

View dynamic templates

hot keyCommand + J

search for

Common search shortcuts

hot key	Search scope
Command + O	Search class
Command + F	Search within files
Command + Shift + O	Find files
Command + Shift + F	Global search
Command + F12	Find from file outline

Heavyweight weapons (search everywhere)

We can also use it to: 

• Split screen
  double shift input split

• The Hierarchy window allows you to clearly see the inheritance relationship of the class
  : You can also double shift lose the hierarchy
  : shortcut keys ctrl⌃ + H