Jetpack Compose

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

Part 1: Jetpack Compose Basics

3. Use Basic Compose Building Blocks

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Previous episode: 2. Learn About Composable Functions Next episode: 4. Add State to Composables

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

In ui/addBook/AddBookActivity, within AddBookTopBar() composable function, the method onBackPressed() is deprecated and is replaced by onBackPressedDispatcher.onBackPressed() method.

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Demo

Now that you’ve learned a bit about basic composable functions and how they work, you’re ready to dive deeper and learn about more composables and how to combine them together.

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  setContent { AddBookContent() } // here
}

@Composable
fun AddBookContent() {
  Scaffold(topBar = { AddBookTopBar() }) {
    AddBookFormContent()
  }
}

@Composable
fun AddBookTopBar() {
  TopAppBar(
    title = {
      Text(text = stringResource(id = R.string.add_book_title))
    },
    navigationIcon = {
      IconButton(onClick = { onBackPressedDispatcher.onBackPressed() }) {
        Icon(Icons.Default.ArrowBack, contentDescription = "Back")
      }
    },
    contentColor = Color.White,
    backgroundColor = colorResource(id = R.color.colorPrimary)
  )
}

@Composable
fun AddBookFormContent() {
  Column(
    modifier = Modifier.fillMaxSize(),
    horizontalAlignment = Alignment.CenterHorizontally
  ) {
  
  }
}

@Composable
fun AddBookFormContent() {
  Column(
    modifier = Modifier.fillMaxSize(),
    horizontalAlignment = Alignment.CenterHorizontally
  ) {
    OutlinedTextField(
      value = "",
      onValueChange = {},
      label = { Text(text = stringResource(id = R.string.book_title_hint)) })

    OutlinedTextField(
      value = "",
      onValueChange = {},
      label = { Text(text = stringResource(id = R.string.book_description_hint)) })
  }
}

@Composable
fun AddBookFormContent() {
  Column(
    modifier = Modifier.fillMaxSize(),
    horizontalAlignment = Alignment.CenterHorizontally
  ) {
	...
      Row {
        TextButton(
          onClick = {},
          content = { Text(text = stringResource(id = R.string.genre_select)) })

        DropdownMenu(
          expanded = false,
          onDismissRequest = {}) {

          DropdownMenuItem(onClick = {}) {

          }
        }
      }
  }
}

@Composable
fun AddBookFormContent() {
  Column(
    modifier = Modifier.fillMaxSize(),
    horizontalAlignment = Alignment.CenterHorizontally
  ) {
	...
    TextButton(
      onClick = { onAddBookTapped() }
    ) {
      Text(text = stringResource(id = R.string.add_book_button_text))
    }
  }
}