9. Anko Commons
Usage of Intents:
INTENTS WITHOUT ANKO
val intent = Intent(this, SomeActivity::class.java)
intent.putExtra("id", 13)
startActivity(intent)
10. Anko Commons
Usage of Intents:
INTENTS WITH ANKO
startActivity<SomeActivity>("id" to 13)
11. Anko Commons
Usage of Intents:
BROWSER INTENT WITHOUT ANKO
val uri =
Uri.parse(“https://www.bapspatil.com”)
val browserIntent = Intent(Intent.ACTION_VIEW,
uri)
startActivity(browserIntent)
12. Anko Commons
Usage of Intents:
BROWSER INTENT WITH ANKO
browse(“https://www.bapspatil.com”)
13. Anko Commons
Usage of Intents:
CALL INTENT WITHOUT ANKO
val uri = Uri.parse(“tel:+917788990099”)
val callIntent = Intent(Intent.ACTION_DIAL)
callIntent.data = uri
startActivity(callIntent)
15. Anko Commons
Usage of Common Android Components:
TOAST WITHOUT ANKO
Toast.makeText(context,
“Hello, people of BlrKotlin!”,
Toast.LENGTH_SHORT)
.show()
16. Anko Commons
Usage of Common Android Components:
TOAST WITH ANKO
toast(“Hello, people of BlrKotlin!”)
// longToast(“Hello, people of BlrKotlin!”)
17. Anko Commons
Usage of Common Android Components:
SNACKBAR WITHOUT ANKO
val snackbar = Snackbar.make(view,
“Hello, people of BlrKotlin!”,
Snackbar.LENGTH_SHORT)
.setAction ( “HI!”,
{ v ->
doSomething()
})
snackbar.show()
18. Anko Commons
Usage of Common Android Components:
SNACKBAR WITH ANKO
snackbar(view, “Hello, people of BlrKotlin!”, “HI!”){
doSomething()
}
19. Anko Commons
Usage of Common Android Components:
ALERTDIALOG WITHOUT ANKO
var alertDialog = AlertDialog.Builder(this)
.setMessage("Hi, this is a message for the AlertDialog.")
.setTitle("Title of the AlertDialog")
.setPositiveButton("OK", DialogInterface.OnClickListener { dialog,
which ->
doSomethingPositive()
})
.setNegativeButton("Cancel", DialogInterface.OnClickListener {
dialog, which ->
doSomethingNegative()
})
.create()
.show()
20. Anko Commons
Usage of Common Android Components:
ALERTDIALOG WITH ANKO
alert(“Hi, this is a message for the AlertDialog.”, “Title of
the AlertDialog”) {
yesButton { doSomethingPositive() }
noButton { doSomethingNegative() }
}.show()
21. Anko Commons
Usage of Logging:
LOGGING WITHOUT ANKO
Log.v(“MainActivity”, “This activity was
created successfully!”)
22. Anko Commons
Usage of Logging:
LOGGING WITH ANKO
class MainActivity : AppCompatActivity(),
AnkoLogger {
override fun onCreate(savedInstanceState:
Bundle?) {
verbose(“This activity was created
successfully!”)
}
}
24. But what’s wrong with XML?
• It forces you to write the same code again.
• It is not typesafe.
• It is not null-safe.
• No code reuse.
• XML parsing is too much overhead. Takes too much CPU time,
and hence battery.
33. Attributes in Anko Layouts DSL
verticalLayout {
lparams(width = matchParent, height = matchParent)
textView {
id = R.id.helloTextView
text = “Hello, people of BlrKotlin!”
textSize = 32f
textColor = 0xffffff.opaque
padding = dip(16)
gravity = Gravity.START // gravity in XML
}.lparams(width = wrapContent, height = wrapContent) {
gravity = Gravity.CENTER // layout_gravity in XML
margin = dip(4)
}
}
34. AnkoComponent<T>
What is it & why use it?
- It’s a separate class where you can write your DSL code for your UI.
- It is reusable.
- It keeps the UI separate from logic.
- You can convert existing XML files to AnkoComponents with the Anko
Support plugin.
- You also get a layout preview if you install the Anko Support plugin.
43. Karamba
A small bunch of useful Kotlin extensions,
very similar to Anko Commons.
https://bit.do/karamba-kotlin
by matteocrippa
44. How would you convert a View to a
Bitmap?
val returnedBitmap = Bitmap.createBitmap(view.width,
view.height,Bitmap.Config.ARGB_8888)
val canvas = Canvas(returnedBitmap)
val bgDrawable = view.background
if (bgDrawable != null)
bgDrawable.draw(canvas)
else
canvas.drawColor(Color.WHITE)
view.draw(canvas)
return returnedBitmap
45. How would you convert a View to a
Bitmap?
val returnedBitmap = view.toBitmap()
46. How would you resize a Bitmap?
val scaleWidth = newWidth.toFloat() / oldWidth
val scaleHeight = newHeight.toFloat() / oldHeight
val matrix = Matrix()
matrix.postScale(scaleWidth, scaleHeight)
val resizedBitmap = Bitmap.createBitmap(
this, 0, 0, oldWidth, oldHeight, matrix, false)
resizedBitmap.recycle()
return resizedBitmap
47. How would you resize a Bitmap?
val resizedBitmap = oldBitmap.resize(newWidth, newHeight)
48. There’s a ton of stuff...
API VERSION:
• support(apiVersion)
• supportLollipop()
• supportKitkat()
BITMAP:
• base64()
• resize(width, height)
BOOLEAN:
• toggle()
• random()
DATE:
• convertTo(format)
[Eg:format=“dd-MM-yy”]
• toCalendar()
• isFuture()
• today()
DOUBLE:
• localCurrency(currency)
[Eg:currency=“USD”]
• celsiusToFahrenheit()
INTEGER:
• commaSeparatedId()
• readableDistanceFromMe
ters()
STRING:
• isValidEmail()
• isPhoneNumber()
• plainText()
• toBitmap()
VIEW:
• toBitmap()
+ more extension functions can be found at
https://bit.do/karamba-kotlin
49.
50. Thank you.
Bapusaheb Patil
Google-certified Android
Developer & OpenClassrooms
Android Mentor
www.bapspatil.com
GitHub | github.com/bapspatil
LinkedIn | linkedin.com/in/bapspatil
Pinterest | pinterest.com/bapspatil
Twitter | twitter.com/baps_patil
(couldn’t get @bapspatil for this one! ☹)
Play Store | bit.do/bapsapps
Watchfaces | bit.do/bapswat
