Jetpack Compose

Oct 11 2022 Kotlin 1.7.10, Android 13, Android Studio Chipmunk

Part 2: Build Complex UI with Compose

11. Build Custom Dialogs

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Previous episode: 10. Add Actions & Handlers Next episode: 12. Add Themes & Styling to the App

The student materials have been reviewed and are updated as of September 2022.

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Demo

You can also build custom dialogs in compose! Let’s build one to be able to add reading lists. Create a new file within the readingLists.ui package, named ReadingListDialogs, and add the following code:

@Composable
fun AddReadingList(
  onAddList: (String) -> Unit = {},
  onDismiss: () -> Unit = {}
) {
  val inputState = remember { mutableStateOf("") }

  Dialog(onDismissRequest = onDismiss) {
    val shape = RoundedCornerShape(16.dp)
  }
}
    Column(
      modifier = Modifier.background(
        MaterialTheme.colors.surface,
        shape = shape
      ).border(width = 1.dp, color = MaterialTheme.colors.primary, shape = shape),
      verticalArrangement = Arrangement.Center,
      horizontalAlignment = Alignment.CenterHorizontally
    ) {

    }
      Spacer(modifier = Modifier.height(16.dp))

      Text(
        text = stringResource(id = R.string.add_reading_list_title),
        fontSize = 18.sp,
        fontWeight = FontWeight.Bold
      )

      InputField(
        label = stringResource(id = R.string.reading_list_name_hint),
        value = inputState.value,
        isInputValid = inputState.value.isNotEmpty(),
        onStateChanged = { newValue -> inputState.value = newValue }
      )
      ActionButton(
        modifier = Modifier.fillMaxWidth(),
        text = stringResource(id = R.string.add_reading_list_button_text),
        isEnabled = inputState.value.isNotEmpty(),
        onClick = { onAddList(inputState.value) },
      )
val readingListsState = mutableStateOf(emptyList<ReadingListsWithBooks>())

private val _isShowingAddReadingListState = mutableStateOf(false)

  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    loadReadingLists()
  }

  private fun loadReadingLists() {
    lifecycleScope.launch {
      readingListsState.value = repository.getReadingLists()
    }
  }
val readingLists = readingListsState.value

Box(
      modifier = Modifier.fillMaxSize(),
      contentAlignment = Alignment.Center
    ) {

    ReadingLists(readingLists, onItemClick = { onItemSelected(it) })
    
      val isShowingAddList = _isShowingAddReadingListState.value

      if (isShowingAddList) {
        AddReadingList(
          onDismiss = { _isShowingAddReadingListState.value = false },
          onAddList = { name ->
            addReadingList(name)
            _isShowingAddReadingListState.value = false
          })
      }
    }
  @Composable
  fun AddReadingListButton() {
    FloatingActionButton(onClick = {
      _isShowingAddReadingListState.value = true
    }) {
      Icon(asset = Icons.Default.Add)
    }
  }


  fun addReadingList(readingListName: String) {
    lifecycleScope.launch {
      repository.addReadingList(ReadingList(name = readingListName, bookIds = emptyList()))

      readingListsState.value = repository.getReadingLists()
    }
  }