Kotlin Android-1
1. Class Declaration class MainActivity : AppCompatActivity() { } 2. Method Declaration class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super .onCreate(savedInstanceState) setContentView(R.layout. activity_main ) } override fun onStart() { super .onStart() } } 3. Initialize View val textview1 = findViewById(R.id. tv1 ) as TextView val textview1 : TextView = findViewById(R.id. tv1 ) as TextView 4. Set Data textview1 .setText( "Test Data" ) 5. Button Click Event val button1 = findViewById(R.id. btn1 ) as Button button1.setOnClickListener { print ( "Button Normal Click" ) } button1 .setOnLongClickListener { true } 6. Toast Toast .makeText( this @MainActivity , "HelloToast" , Toast . LENGTH_SHORT ).show() 7. 22