easyhooon / peekaboo

🌄 Kotlin Multiplatform library for Compose Multiplatform, designed for seamless integration of an image picker feature in iOS and Android applications.

peekaboo

📂 Kotlin Multiplatform library for Compose Multiplatform, designed for seamless integration of an image picker feature in iOS and Android applications.

Getting started

Compose Multiplatform

peekaboo is based on Compose Multiplatform, currently targeting only iOS and Android.
Please note that it primarily focuses on these platforms, and additional platforms may be considered in the future.
When using peekaboo on Android, ensure that Google's Jetpack Compose version is compatible with peekaboo's Compose Multiplatform version.

Installation

The minimum supported Android SDK is 24 (Android 7.0).

In your commonMain configuration, add the desired dependency, either peekaboo-ui or peekaboo-image-picker, to your project. Both are available on Maven Central.

Without Version Catalog

commonMain {
    dependencies {
    	// peekaboo-ui
        implementation("io.github.team-preat:peekaboo-ui:$latest_version")

        // peekaboo-image-picker
        implementation("io.github.team-preat:peekaboo-image-picker:$latest_version")
    }
}

With Version Catalog

First, define the version in libs.versions.toml:

[versions]
peekaboo = "0.3.0"

[libraries]
peekaboo-ui = { module = "io.github.team-preat:peekaboo-ui", version.ref = "peekaboo" }
peekaboo-image-picker = { module = "io.github.team-preat:peekaboo-image-picker", version.ref = "peekaboo" }

Then, in your commonMain configuration, reference the defined version:

commonMain {
    dependencies {
        // peekaboo-ui
        implementation(libs.peekaboo.ui)

        // peekaboo-image-picker
        implementation(libs.peekaboo.image.picker)
    }
}

Artifacts

Name	Description
peekaboo-ui	Provides user-friendly UI elements, including a custom camera view for easy image capture, suitable for both iOS and Android platforms.
peekaboo-image-picker	Simplifies the process of selecting single or multiple images both in iOS and Android platforms.

Usage

Xcode setup

In order to access the camera on iOS devices, it's essential to include a specific key-value pair in the Info.plist file of your iOS project. This key-value pair comprises a key that identifies the type of permission being requested and a value that provides a user-friendly description explaining why the app needs access to the camera.

Here's the key-value pair you should add to your Info.plist:

<key>Privacy - Camera Usage Description</key>
<string>This app uses camera for capturing photos.</string>

Custimizable Camera UI

PeekabooCamera is a composable function that provides a customizable camera UI within a Compose Multiplatform application.

@Composable
fun CustomCameraView() {
    PeekabooCamera(
        modifier = Modifier.fillMaxSize(),
        cameraMode = CameraMode.Back, // or CameraMode.Front
        captureIcon = { onClick -> /* Custom Capture Button UI */ },
        convertIcon = { onClick -> /* Custom Convert Button UI */ },
        progressIndicator = { /* Custom Progress Indicator UI */ },
        onCapture = { byteArray ->
            // Handle the captured image
        },
        permissionDeniedContent = {
            // Custom UI content for permission denied scenario
        }
    )
}

• cameraMode : The initial camera mode (front or back). Default is CameraMode.Back.
• captureIcon : A composable lambda for the capture button. It takes an onClick lambda that triggers the image capture process.
• convertIcon : An optional composable lambda for a button to toggle the camera mode (front or back). It takes an onClick lambda for switching the camera.
• progressIndicator : An optional composable lambda displayed during photo capture processing.
• onCapture : A lambda called when a photo is captured, providing the photo as a ByteArray or null if the capture fails.
• permissionDeniedContent : An optional composable lambda that provides content to be displayed when camera permission is denied. This allows users to define a custom UI to inform or guide the user when camera access has been denied. The content can be informative text, an image, a button to redirect the user to settings, or any other composable content. This lambda will be invoked within the PeekabooCamera composable scope, replacing the camera preview with the user-defined UI.

💡 Note: It's recommended to handle camera permission checks before rendering PeekabooCamera. This preemptive check ensures the camera UI is displayed only when permissions are granted, avoiding empty views or unexpected user experiences.

Capturing an Image from Camera

Android	iOS

Toggling Camera Mode Between Front and Back

Android	iOS

Handling Denied Camera Permissions

Android	iOS

Select Single Image

val scope = rememberCoroutineScope()

val singleImagePicker = rememberImagePickerLauncher(
    selectionMode = SelectionMode.Single,
    scope = scope,
    onResult = { byteArrays ->
        byteArrays.firstOrNull()?.let {
            // Process the selected images' ByteArrays.
            println(it)
        }
    }
)

Button(
    onClick = {
        singleImagePicker.launch()
    }
) {
    Text("Pick Single Image")
}

Android	iOS

Simply select the desired image with an intuitive interface.

Select Multiple Images

If you want to select multiple images, you can use SelectionMode.Multiple(). And you can set the maximum number of images to select. If you didn't set max selection, the default value is maximum number that the system supports.

val scope = rememberCoroutineScope()

val multipleImagePicker = rememberImagePickerLauncher(
    // Optional: Set a maximum selection limit, e.g., SelectionMode.Multiple(maxSelection = 5).
    // Default: No limit, depends on system's maximum capacity.
    selectionMode = SelectionMode.Multiple(maxSelection = 5),
    scope = scope,
    onResult = { byteArrays ->
        byteArrays.forEach {
            // Process the selected images' ByteArrays.
            println(it)
        }
    }
)

Button(
    onClick = {
        multipleImagePicker.launch()
    }
) {
    Text("Pick Multiple Images")
}

Android	iOS

ByteArray to ImageBitmap Conversion

We've added a new extension function toImageBitmap() to convert a ByteArray into an ImageBitmap.
This function simplifies the process of converting image data into a displayable format, enhancing the app's capability to handle image processing efficiently.

Usage

val imageBitmap = byteArray.toImageBitmap()

Contributions 🙏

Contributions are always welcome!

If you'd like to contribute, please feel free to create a PR or open an issue. 👍

Stargazers ⭐

Support it by joining stargazers for this repository. ⭐

License

Copyright 2023 onseok

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.