How to Animate the Show/Hide of the Keyboard with Jetpack Compose?

Are you tired of the clunky, unresponsive behavior of the keyboard in your Android app? Do you want to elevate the user experience by animating the show/hide of the keyboard with Jetpack Compose? Look no further! In this comprehensive guide, we’ll take you by the hand and walk you through the steps to achieve a seamless keyboard animation using Jetpack Compose.

Why Animate the Keyboard?

Before we dive into the nitty-gritty of animating the keyboard, let’s talk about why it’s essential. A well-designed keyboard animation can:

• Improve the overall user experience by providing a more natural and responsive interaction
• Enhance the aesthetic appeal of your app by adding a touch of elegance and sophistication
• Boost user engagement by making the app more enjoyable to use

What is Jetpack Compose?

Jetpack Compose is a modern, declarative UI framework for Android app development. It allows you to create stunning UI components using a simple, concise, and intuitive syntax. With Jetpack Compose, you can focus on building the UI logic without worrying about the underlying Android architecture.

Getting Started with Jetpack Compose

Before we begin animating the keyboard, make sure you have:

• Android Studio 4.2 or later installed
• Jetpack Compose 1.0.0 or later added to your project
• A basic understanding of Kotlin programming language

Step 1: Create a Composable Function

To animate the keyboard, we’ll create a composable function that will handle the show/hide behavior. Create a new Kotlin file and add the following code:

@Composable
fun AnimatedKeyboard(
    keyboardState: MutableState,
    modifier: Modifier = Modifier
) {
    // We'll add the animation logic here
}

Step 2: Add the Keyboard State

We need to track the state of the keyboard to animate it correctly. Add the following code to your composable function:

@Composable
fun AnimatedKeyboard(
    keyboardState: MutableState<Boolean>,
    modifier: Modifier = Modifier
) {
    val keyboardHeight = remember { mutableStateOf(0) }
    val keyboardVisibility = remember { mutableStateOf(false) }

    LaunchedEffect(keyboardState.value) {
        if (keyboardState.value) {
            // Keyboard is showing
            keyboardHeight.value = getKeyboardHeight()
            keyboardVisibility.value = true
        } else {
            // Keyboard is hiding
            keyboardHeight.value = 0
            keyboardVisibility.value = false
        }
    }
}

Step 3: Get the Keyboard Height

To animate the keyboard correctly, we need to get its height. Add the following function to your composable function:

private fun getKeyboardHeight(): Int {
    val rect = Rect()
    window.decorView.getWindowVisibleDisplayFrame(rect)
    val height = window.decorView.context.getResources().getDisplayMetrics().heightPixels
    return height - rect.bottom
}

Step 4: Animate the Keyboard

Now it’s time to add the animation logic. We’ll use the `animate` function to smoothly show/hide the keyboard. Add the following code to your composable function:

@Composable
fun AnimatedKeyboard(
    keyboardState: MutableState<Boolean>,
    modifier: Modifier = Modifier
) {
    // ...

    AnimatedVisibility(
        visible = keyboardVisibility.value,
        enter = fadeIn(
            animationSpec = tween(durationMillis = 300)
        ),
        exit = fadeOut(
            animationSpec = tween(durationMillis = 300)
        )
    ) {
        Spacer(
            modifier = Modifier
                .height(keyboardHeight.value.dp)
                .fillMaxWidth()
        )
    }
}

Step 5: Integrate with Your App

Finally, integrate the `AnimatedKeyboard` composable function with your app. Add the following code to your app’s UI:

@Composable
fun MyScreen() {
    val keyboardState = remember { mutableStateOf(false) }

    AnimatedKeyboard(keyboardState = keyboardState)

    TextField(
        value = "Type something...",
        onValueChange = { /* handle text input */ },
        singleLine = true,
        modifier = Modifier
            .fillMaxWidth()
            .padding(16.dp)
            .onFocusChanged { focusState ->
                keyboardState.value = focusState.isFocused
            }
    )
}

Conclusion

That’s it! You’ve successfully animated the show/hide of the keyboard using Jetpack Compose. With this comprehensive guide, you’ve learned how to:

1. Create a composable function to handle the keyboard animation
2. Track the keyboard state and get its height
3. Animate the keyboard show/hide behavior using `AnimatedVisibility` and `fadeIn`/`fadeOut` effects

By following these steps, you’ve elevated the user experience of your app and provided a more natural and responsive interaction. Happy coding!

Key	Value
Jetpack Compose Version	1.0.0 or later
Android Studio Version	4.2 or later
Kotlin Version	1.5.0 or later

Frequently Asked Question

Are you an Android developer looking to learn the secrets of animating the show/hide of the keyboard with Jetpack Compose?