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icerockdev#34 add ImagePickerDelegate
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Alexey Nesterov
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May 2, 2024
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media/src/androidMain/kotlin/dev/icerock/moko/media/picker/ImagePickerDelegate.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| package dev.icerock.moko.media.picker | ||
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| import android.content.Context | ||
| import android.net.Uri | ||
| import androidx.activity.ComponentActivity | ||
| import androidx.activity.result.ActivityResultLauncher | ||
| import androidx.activity.result.ActivityResultRegistryOwner | ||
| import androidx.activity.result.PickVisualMediaRequest | ||
| import androidx.activity.result.contract.ActivityResultContracts | ||
| import androidx.lifecycle.Lifecycle | ||
| import androidx.lifecycle.LifecycleEventObserver | ||
| import androidx.lifecycle.LifecycleOwner | ||
| import dev.icerock.moko.media.BitmapUtils | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
|
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| internal class ImagePickerDelegate { | ||
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| private var callback: CallbackData? = null | ||
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| private val takePictureLauncherHolder = MutableStateFlow<ActivityResultLauncher<Uri>?>(null) | ||
| private val pickVisualMediaLauncherHolder = | ||
| MutableStateFlow<ActivityResultLauncher<PickVisualMediaRequest>?>(null) | ||
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| fun bind(activity: ComponentActivity) { | ||
| val activityResultRegistryOwner = activity as ActivityResultRegistryOwner | ||
| val activityResultRegistry = activityResultRegistryOwner.activityResultRegistry | ||
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| pickVisualMediaLauncherHolder.value = activityResultRegistry.register( | ||
| PICK_GALLERY_IMAGE_KEY, | ||
| ActivityResultContracts.PickVisualMedia(), | ||
| ) { uri -> | ||
| val callbackData = callback ?: return@register | ||
| callback = null | ||
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| val callback = callbackData.callback | ||
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| if (uri == null) { | ||
| callback.invoke(Result.failure(CanceledException())) | ||
| return@register | ||
| } | ||
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| processResult(activity, callback, uri) | ||
| } | ||
|
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| takePictureLauncherHolder.value = activityResultRegistry.register( | ||
| "TakePicture", | ||
| ActivityResultContracts.TakePicture(), | ||
| ) { result -> | ||
| val callbackData = callback ?: return@register | ||
| callback = null | ||
|
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| if (callbackData !is CallbackData.Camera) { | ||
| callbackData.callback.invoke( | ||
| Result.failure( | ||
| IllegalStateException("Callback type should be Camera") | ||
| ) | ||
| ) | ||
| return@register | ||
| } | ||
|
|
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| if (!result) { | ||
| callbackData.callback.invoke(Result.failure(CanceledException())) | ||
| return@register | ||
| } | ||
|
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| processResult(activity, callbackData.callback, callbackData.outputUri) | ||
| } | ||
|
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| val observer = object : LifecycleEventObserver { | ||
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| override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) { | ||
| if (event == Lifecycle.Event.ON_DESTROY) { | ||
| takePictureLauncherHolder.value = null | ||
| pickVisualMediaLauncherHolder.value = null | ||
| source.lifecycle.removeObserver(this) | ||
| } | ||
| } | ||
| } | ||
| activity.lifecycle.addObserver(observer) | ||
| } | ||
|
|
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| fun pickGalleryImage( | ||
| maxWidth: Int, | ||
| maxHeight: Int, | ||
| callback: (Result<android.graphics.Bitmap>) -> Unit, | ||
| ) { | ||
| this.callback?.let { | ||
| it.callback.invoke(Result.failure(IllegalStateException("Callback should be null"))) | ||
| this.callback = null | ||
| } | ||
|
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| this.callback = CallbackData.Gallery(callback) | ||
|
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| pickVisualMediaLauncherHolder.value?.launch( | ||
| PickVisualMediaRequest(ActivityResultContracts.PickVisualMedia.ImageOnly) | ||
| ) | ||
| } | ||
|
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| fun pickCameraImage( | ||
| maxWidth: Int, | ||
| maxHeight: Int, | ||
| callback: (Result<android.graphics.Bitmap>) -> Unit, | ||
| outputUri: Uri, | ||
| ) { | ||
| this.callback?.let { | ||
| it.callback.invoke(Result.failure(IllegalStateException("Callback should be null"))) | ||
| this.callback = null | ||
| } | ||
|
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| this.callback = CallbackData.Camera(callback, outputUri) | ||
|
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| takePictureLauncherHolder.value?.launch( | ||
| outputUri | ||
| ) | ||
| } | ||
|
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| @Suppress("ReturnCount") | ||
| private fun processResult( | ||
| context: Context, | ||
| callback: (Result<android.graphics.Bitmap>) -> Unit, | ||
| uri: Uri, | ||
| maxImageWidth: Int = DEFAULT_MAX_IMAGE_WIDTH, | ||
| maxImageHeight: Int = DEFAULT_MAX_IMAGE_HEIGHT, | ||
| ) { | ||
| val contentResolver = context.contentResolver | ||
|
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| val bitmapOptions = contentResolver.openInputStream(uri)?.use { | ||
| BitmapUtils.getBitmapOptionsFromStream(it) | ||
| } ?: run { | ||
| callback.invoke(Result.failure(NoAccessToFileException(uri.toString()))) | ||
| return | ||
| } | ||
|
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| val sampleSize = | ||
| BitmapUtils.calculateInSampleSize(bitmapOptions, maxImageWidth, maxImageHeight) | ||
|
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| val orientation = contentResolver.openInputStream(uri)?.use { | ||
| BitmapUtils.getBitmapOrientation(it) | ||
| } ?: run { | ||
| callback.invoke(Result.failure(NoAccessToFileException(uri.toString()))) | ||
| return | ||
| } | ||
|
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| val bitmap = contentResolver.openInputStream(uri)?.use { | ||
| BitmapUtils.getNormalizedBitmap(it, orientation, sampleSize) | ||
| } ?: run { | ||
| callback.invoke(Result.failure(NoAccessToFileException(uri.toString()))) | ||
| return | ||
| } | ||
|
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| callback.invoke(Result.success(bitmap)) | ||
| } | ||
|
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| sealed class CallbackData(val callback: (Result<android.graphics.Bitmap>) -> Unit) { | ||
| class Gallery(callback: (Result<android.graphics.Bitmap>) -> Unit) : | ||
| CallbackData(callback) | ||
|
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| class Camera( | ||
| callback: (Result<android.graphics.Bitmap>) -> Unit, | ||
| val outputUri: Uri | ||
| ) : CallbackData(callback) | ||
| } | ||
|
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| companion object { | ||
| private const val PICK_GALLERY_IMAGE_KEY = "PickGalleryImageKey" | ||
| } | ||
| } |
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