Android - calculator in kotlin, Appunti di Sviluppo di Applicazioni Web

Scarica Android - calculator in kotlin e più Appunti in PDF di Sviluppo di Applicazioni Web solo su Docsity!

CALCULATOR

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <Button android:id="@+id/buAC" android:layout_weight="1" android:layout_width="30pt" android:layout_height="30pt" android:layout_marginRight="2pt" android:text="AC" android:onClick="acEvent" android:background="@color/blueblack"

android:layout_height="30pt" android:layout_marginRight="2pt" android:text="9" android:onClick="numberEvent" android:background="@color/blueblack"

android:onClick="numberEvent" android:background="@color/blueblack"

android:background="@color/colorAccent"

MainActivity.kt

class MainActivity : AppCompatActivity() { var isNewOp = true var oldNumber = "" var op = " " override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout. activity_main ) } fun numberEvent(view: View) { var buclick = findViewById(R.id. editText ) var numero = buclick. text .toString() var bu1 = findViewById(R.id. bu1 ) var bu2 = findViewById(R.id. bu2 ) var bu3 = findViewById(R.id. bu3 ) var bu4 = findViewById(R.id. bu4 ) var bu5 = findViewById(R.id. bu5 ) var bu6 = findViewById(R.id. bu6 ) var bu7 = findViewById(R.id. bu7 ) var bu8 = findViewById(R.id. bu8 ) var bu9 = findViewById(R.id. bu9 ) var bu0 = findViewById(R.id. bu0 ) var buDot = findViewById(R.id. buDot ) var buPlusMinus = findViewById(R.id. buPlusMinus ) var buselect = view as Button if(isNewOp) numero = " " isNewOp = false when (buselect. id ) { bu1. id -> { numero += "1" } bu2. id -> { numero += "2" } bu3. id -> { numero += "3" } bu4. id -> { numero += "4" } bu5. id -> { numero += "5" }

bu6. id -> { numero += "6" } bu7. id -> { numero += "7" } bu8. id -> { numero += "8" } bu9. id -> { numero += "9" } bu0. id -> { numero += "0" } buDot. id -> { numero += "." } //rende il numero negativo buPlusMinus. id -> {numero = "-$numero"} } buclick.setText(numero) } fun operatorEvent(view: View) { isNewOp = true var buclick = findViewById(R.id. editText ) //prende il numero sullo schermo oldNumber = buclick. text .toString() var buMultiply = findViewById

(R.id. buMultiply ) var buPlus = findViewById(R.id. buPlus ) var buMinus = findViewById(R.id. buMinus ) var buDivide = findViewById(R.id. buDivide ) var buselect = view as Button when(buselect. id ){ buMultiply. id -> {op = ""} buPlus. id -> {op = "+"} buMinus. id -> {op = "-"} buDivide. id -> {op = "/"} } } fun equalEvent(view: View) { var buclick = findViewById(R.id. editText ) //prende il numero sullo schermo var newNumber = buclick. text .toString() var result = 0. when(op){ "+" -> {result = oldNumber. toDouble () + newNumber. toDouble ()} "" -> {result = oldNumber. toDouble () * newNumber. toDouble ()} "/" -> {result = oldNumber. toDouble () / newNumber. toDouble ()} "-" -> {result = oldNumber. toDouble () - newNumber. toDouble ()} } buclick.setText(result.toString()) }