Android: Kotlin Android Extensions – View Binding

It’s annoying to call the findViewById() lines every time getting a layout or a View widget, sometimes too many use of these lines may mess with other codes. There are not few view binding libraries helped developers avoid this, but most of them requires some extra code in XML layout files. And then here comes the Kotlin Android Extensions View Binding.

Python Basics: Module & Namespace

A module in Python is a Python source file that contains definitions and use them in a script or in an interactive instance of the interpreter.
We use modules to divide a piece of software into separate but cooperating parts.

Android Basics: Calendar Class

Documentation for the Calendar class
Use Calendar.getInstance() to get current date time; very similar in Kotlin.

To Compare Float, Double, or Long Data Types

A way to make doubles, floats, or longs ‘equal’.

Float a=1.56148; Float b=1.56139;
  Float threshold = 0.00009 or 0.0001 //difference of Float a and Float b
  if (Math.abs(a-b) <= threshold){//Or < threshold
     //logic here
  }

Android Kotlin: System UI Control

A short code bloc in Kotlin to hide Android devices’ system navigation bar and status bar in order to make a full-screen.

Android Java: SpannableStringBuilder

SpannableStringBuilder() is a class for styling a specific length of a string.
The syntax in Java:

SpannableStringBuilder() span = new SpannableStringBuilder(string); 
 span.append(); <- you can put the string value in append() or just do 
 like the above line
 

Python Basics: Immutable Sequence Type & Tuples 2

To get an element of a tuple in order to read them over, you can use the same way while you are using a list:

tuple=(1, 10, 100, 1000)
 print(tuple[0]) -> the index is 0, so output is 1
 print(tuple[-1]) -> the last index, so the output is 1000
 print(tuple[1:]) -> starting index is 1, so the output is (10,100,1000) 

Python Basics: Immutable Sequence Type & Tuples 1

Sequence type: a data type in Python which is able to store more than one value or less than one value (as a sequence my be empty), and these values can be sequentially browsed element by element (like a list).

Mutability: a property of any of Python’s data that describes its readiness to be freely changed during program execution.

Python Basics: Define A Function

It is easy…and it’s similar to if or for statement formats:

def functionName():
  //logics here...

Python Basics: List

A list in Python is like an array or a list in Java.
Still, it’s very simple to declare a Python list:

list = [1,2,3,4] <- an int type list
  list = ["2","Hello","World"] <- a string type list
  list = [] <- just to define an empty list