mirokolodii

@Composable
fun SearchBox(
  onBackClick: () -> Unit,
) {
  var searchText by remember { mutableStateOf("") }
  
  Row(
    horizontalArrangement = Arrangement.spaced(16.dp),
  ) {
    Icon(

mirokolodii

private val previewItems = listOf(
    mapOf(
        "Dimension" to "34x12x8",
    ),
    mapOf(
        "Display" to "6.4 inches",
        "Resolution" to "1080x2340"
    ),
    mapOf(
        "OS" to "Android 10",

mirokolodii

@Preview
@Composable
fun CustomViewPreview(
    @PreviewParameter(ViewStateProvider::class) params: PreviewParams,
) {
    AndroidView(
        modifier = Modifier
            .fillMaxWidth()
            .background(Color.White)
            .padding(8.dp),

mirokolodii

<?xml version="1.0" encoding="utf-8"?>
<merge 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="wrap_content"
    android:background="@drawable/background_info_view"
    android:padding="16dp"
    tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout"
    >

mirokolodii

class OrderView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null
) : ConstraintLayout(context, attrs) {

    private val binding = ViewOrderBinding.inflate(LayoutInflater.from(context), this)

    init {
        setPadding(context.dpToPx(16))
        background = context.drawable(R.drawable.background_info_view)

mirokolodii

val nonNullInt = 1
val nullInt: Int? = null
if (nullInt == nonNullInt) {
  println("Both are equal")
} else {
  println("Not equal") // Result is 'Not equal'
}

mirokolodii

var nonNullInt = 1
val nullInt: Int? = null
// 1. Error
nonNullInt = nullInt // Error: type mismatch
// 2. Valid
if (nullInt != null) {
    /* Here is used a smart cast (one of Kotlin compiler's feature),
       which casts Int? to Int automatically */
    nonNullInt = nullInt 
}

mirokolodii

Integer nullInt = null;
if (someInt.equals(23)) { // NullPointerException because of attempt to call
                          // a method on a null
  // Rest of code
} 

mirokolodii

Integer intObj = null;
int primitiveInt;
primitiveInt = intObj; // NullPointerException during unboxing

mirokolodii

var nullableStr: String? = null
var nonNullStr: String = "a string"
nullableStr = nonNullStr              // valid
nonNullStr = nullableStr              // error, should be checked for nullability first
If (nullableStr != null) {
  nonNullStr = nullableStr            // valid
}