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| //Sample 1 | |
| private var button: Button = findViewById(R.id.button) | |
| //Sample 2 | |
| private var button: Button? = null | |
| private fun init(){ button = findViewById(R.id.button) } | |
| //Sample 3 (The lateinit keyword stands for late initialization. lateinit modifier is allowed only on mutable properties) | |
| private lateinit var button:Button | |
| private fun init(){ button = findViewById(R.id.button) } | |
| //Sample 4 | |
| private val button:Button by lazy { | |
| findViewById(R.id.button) as Button | |
| // or | |
| findViewById<Button>(R.id.button) | |
| } | |
| // we need use to init button | |
| button.setOnClickListener{ } | |
| //Sample 5 (use view id directly) | |
| button.setOnClickListener {textView.text = "Hello Kotlin"} | |
| //Sample 6 | |
| var textView: TextView? = null | |
| textView = findViewById(R.id.textView) | |
| textView?.text = "Sample Text" |
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