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. 

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