Tutorial about starting Android development

[Jason Edwards]

Hello Coderanch, I can see this thread is a month old but it has a good title, and I don't know how to start my own thread.

Have been using android studio for the last 4 years and really enjoy building applications in my spare time( have a young demanding family and a full time job(in catering) so only spending 5-10 hours a week on coding).

Love using java to develop applications but kotlin looks more productive in the long run.

This course on YouTube looks great  (https://youtu.be/uRyvNKRkwbs )

Does anyone want to join me on this course over the next month?

[Campbell Ritchie]

Welcome to the Ranch

Use the new topic button towards the upper right.
Did you write that tutorial yourself? I don't have the time to go through it.

[Jason Edwards]

Campbell Ritchie wrote:Welcome to the Ranch

Use the new topic button towards the upper right.
Did you write that tutorial yourself? I don't have the time to go through it.

Thanks Campbell Ritchie, could you move my posts to the android section as a new thread?

It's not my tutorial, just looks up-to-date and a good tutorial on YouTube, I would like to use github and push myself to write clean short code. Would be great to help other developers and inturn they can make comments about my code.

[Campbell Ritchie]

Jason Edwards wrote:. . . move my posts to the android section . . . .

Done. Complete with spelling mistake in thread title.

[Jason Edwards]

Campbell Ritchie wrote:

Jason Edwards wrote:. . . move my posts to the android section . . . .

Done. Complete with spelling mistake in thread title.

Thanks Campbell.

[Jason Edwards]

Hi all,
I have started going through the tutorial and put my code up on github.(https://github.com/JasonEdwardesUk/FollowAndroidTutorialWithKotlin). Often I use Linearlayout, only program in code, never use android studio layout editor.

[Jason Edwards]

So far I have 4 commits:
First one, is the blank activity and java class.
Second one is a basic kotlin hello world app.
Third one's a toast message when you click the button.
Fourth one, counts the button clicks and displays it to the textview.

[Jason Edwards]

hi all,
(commit 5) Improved the code, put a few comments for easy reading
(commit 6) removed most the code, looked into Concepts of OOP Languages(starts about 1 hour in), and I must say, I am very happy going from Java to Kotlin so far.
feels like you can build the same apps with less code, been writing some code and seeing what I can do.
Took me about 1 hour to build the app and fix all the bugs.
Its a lotto lucky dip to pick your numbers.

fun main(args: Array<String>) {
//  Please select 6 or higher for the maximum random number generator.
   
    NumberPicker(6)
    NumberPicker(20)
    NumberPicker(39)
    NumberPicker(59)

}

fun NumberPicker(maxNumber: Int) {
    if (maxNumber < 6) {
        // if the numbers less than 6, this message will be displayed
        println("please select 6 or higher")
  
  } else {
        // SecureRandom() is a class that generate a random number.
        var secureRandom = SecureRandom()

        //secureRandom.nextInt(maxNumber) will give me a random number upto the value of maxNumber
        //and firstNumber will store the value. The other 5 numbers will do the same.

        var firstNumber = secureRandom.nextInt(maxNumber)

        var secondNumber = secureRandom.nextInt(maxNumber)

        while (firstNumber == secondNumber) {
            secondNumber = secureRandom.nextInt(maxNumber)
        }
        var thirdNumber = secureRandom.nextInt(maxNumber)

        // The while loop will check if any 2 numbers are the same, if they are, another random number will be used.

        while ((firstNumber == thirdNumber) || (secondNumber == thirdNumber)) {
            thirdNumber = secureRandom.nextInt(maxNumber)
        }

        var fourthNumber = secureRandom.nextInt(maxNumber)
        while ((firstNumber == fourthNumber) || (secondNumber == fourthNumber) || (thirdNumber == fourthNumber)) {
            fourthNumber = secureRandom.nextInt(maxNumber)
        }
        var fifthNumber = secureRandom.nextInt(maxNumber)
        while ((firstNumber == fifthNumber) || (secondNumber == fifthNumber) || (thirdNumber == fifthNumber) ||
            (fourthNumber == fifthNumber)
        ) {
            fifthNumber = secureRandom.nextInt(maxNumber)
        }
        var sixthNumber = secureRandom.nextInt(maxNumber)

        while ((firstNumber == sixthNumber) || (secondNumber == sixthNumber) || (thirdNumber == sixthNumber) ||
            (fourthNumber == sixthNumber) || fifthNumber == sixthNumber
        ) {
            sixthNumber = secureRandom.nextInt(maxNumber)
        }
        //In code, all numbers start at zero, ++ increases the current value by one.
        ++firstNumber; ++secondNumber; ++thirdNumber; ++fourthNumber; ++fifthNumber; ++sixthNumber

        // prints the numbers out, the current low number is to show the code works but change it in main NumberPicker(59)
        println("My lotto numbers tonight $firstNumber $secondNumber $thirdNumber $fourthNumber $fifthNumber $sixthNumber")

    }
}