K4Kotlin
A sweet, small set of Kotlin functions to reduce your android boilerplate code
Dependency
Add this in your project level build.gradle file ( not your module build.gradle file):
allprojects {
repositories {
maven {
url "https://jitpack.io"
}
// add this line
}
}
Then, add the library to your module build.gradle
dependencies {
compile 'com.github.kirtan403:K4Kotlin:0.1.7'
}
Usage
View
Set View's visibility to visible
Instead of
myView.setVisibility(View.VISIBLE);
use:
myView.show() Set View's visibility to gone
Instead of
myView.setVisibility(View.GONE);
use:
myView.hide() Set View's visibility to invsible
Instead of
myView.setVisibility(View.INVISIBLE);
use:
myView.invisible() Toggle View's visibility between VISIBLE and GONE
Instead of
if(myView.getVisibility() == View.VISIBLE)
myView.setVisibility(View.GONE);
else
myView.setVisibility(View.VISIBLE);
use:
myView.toggle() To fade in a view
myView.fadeIn() myView.fadeIn(1000) // Optional duration To fade out a view
myView.fadeOut() myView.fadeOut(1000) // Optional duration Fade to specific alpha of a view
myView.fadeTo(0.5f) myView.fadeTo(0.5f,1000) // Optional duration View Animations
Enter and exit animations for views
mView.enterFromTop() mView.enterFromLeft() mView.enterFromBottom() mView.enterFromRight() mView.exitToTop() mView.exitToLeft() mView.exitToBottom() mView.exitToRight() // with optional duration mView.enterFromTop(1000) Activity
Hide the keyboard
hideKeyboard() // Anywhere inside your activity Context
hide/show multiple views
hideViews(myView1,myView2,myView3,.. myViewN) // Sets all views visibility to GONE showViews(myView1,myView2,myView3,.. myViewN) // Sets all views visibility to VISIBLE dpToPx
dpToPx(14) // returns px equal to 14dp pxToDp
pxToDp(14) // returns dp equal to 14px Number
Number?.orZero() method for all number types
if(myNumberVar.orZero()) // return 0 if variable is null Boolean
Boolean?.orFalse() method
if(myBooleanVar.orFalse()) // return false if variable is null EditText
Text watcher
var textWatcher = myEditText.addTextWatcher {
Log.d(TAG, "text changed!")
}
Spinner
setItems - Set spinner list
Generates the adapter from the ArrayList of Object and accepts layout file resource and Object to String conversion method.
spinner.setItems(items) {
it.name + " (" + it.code + ")"
}
// function that converts item instance to string for spinner onItemChanged - simpler callback method for OnItemSelectedListener
mBinding.spinner.onItemSelected {
_, _, position, _ -> val (name, _) = countries[position.orZero()] toast("You selected : $name")
}
Any - helpers for all classes
TAG - a property helpful for Log Tags
You don't need to declare a TAG everytime you want to use the Log.d(TAG,"My log"). It is declared globally for all classes, and can be used without declaring TAG in class.