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ask permission now for taking a photo
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84 changes: 84 additions & 0 deletions
84
app/src/main/java/de/westnordost/streetcomplete/quests/note_discussion/TakePhoto.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package de.westnordost.streetcomplete.quests.note_discussion | ||
|
|
||
| import android.Manifest | ||
| import android.app.Activity | ||
| import android.content.Context | ||
| import android.graphics.Bitmap | ||
| import android.os.Environment | ||
| import androidx.activity.result.ActivityResultCaller | ||
| import androidx.activity.result.contract.ActivityResultContracts | ||
| import androidx.core.app.ActivityCompat | ||
| import androidx.core.content.FileProvider | ||
| import de.westnordost.streetcomplete.ApplicationConstants | ||
| import de.westnordost.streetcomplete.R | ||
| import de.westnordost.streetcomplete.ktx.hasCameraPermission | ||
| import de.westnordost.streetcomplete.util.ActivityForResultLauncher | ||
| import de.westnordost.streetcomplete.util.decodeScaledBitmapAndNormalize | ||
| import java.io.File | ||
| import java.io.FileOutputStream | ||
| import java.io.IOException | ||
|
|
||
| /** Requests permission to, takes a photo and rescales it */ | ||
| class TakePhoto( | ||
| activityResultCaller: ActivityResultCaller, | ||
| private val askUserToAcknowledgeCameraPermissionRationale: suspend () -> Boolean, | ||
| ) { | ||
| private val requestPermission = ActivityForResultLauncher(activityResultCaller, ActivityResultContracts.RequestPermission()) | ||
| private val takePhoto = ActivityForResultLauncher(activityResultCaller, ActivityResultContracts.TakePicture()) | ||
|
|
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| /** Returns the file path where to find the taken photo or null if no photo has been taken. | ||
| * | ||
| * May return an ActivityNotFoundException if there is no camera app or an IOException if the | ||
| * photo file could not be created. */ | ||
| suspend operator fun invoke(activity: Activity): String? { | ||
| if (!activity.hasCameraPermission) { | ||
| if (!requestCameraPermission(activity)) { | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| var file: File? = null | ||
| try { | ||
| file = createImageFile(activity) | ||
| val photoUri = FileProvider.getUriForFile(activity, activity.getString(R.string.fileprovider_authority), file) | ||
| val saved = takePhoto(photoUri) | ||
| if (!saved) { | ||
| deleteImageFile(file) | ||
| return null | ||
| } | ||
| rescaleImageFile(file) | ||
|
|
||
| return file.path | ||
| } catch (e: Exception) { | ||
| file?.let { deleteImageFile(it) } | ||
| throw e | ||
| } | ||
| } | ||
|
|
||
| private suspend fun requestCameraPermission(activity: Activity): Boolean { | ||
| if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.CAMERA)) { | ||
| if (!askUserToAcknowledgeCameraPermissionRationale()) { | ||
| return false | ||
| } | ||
| } | ||
| return requestPermission(Manifest.permission.CAMERA) | ||
| } | ||
|
|
||
| private fun createImageFile(context: Context): File { | ||
| val directory = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES) | ||
| val imageFileName = "photo_" + System.currentTimeMillis() + ".jpg" | ||
| val file = File(directory, imageFileName) | ||
| if (!file.createNewFile()) throw IOException("Photo file with exactly the same name already exists") | ||
| return file | ||
| } | ||
|
|
||
| private fun rescaleImageFile(file: File) { | ||
| val bitmap = decodeScaledBitmapAndNormalize(file.path, ApplicationConstants.ATTACH_PHOTO_MAXWIDTH, ApplicationConstants.ATTACH_PHOTO_MAXHEIGHT) ?: throw IOException() | ||
| val out = FileOutputStream(file.path) | ||
| bitmap.compress(Bitmap.CompressFormat.JPEG, ApplicationConstants.ATTACH_PHOTO_QUALITY, out) | ||
| } | ||
|
|
||
| private fun deleteImageFile(file: File) { | ||
| if (file.exists()) file.delete() | ||
| } | ||
| } |
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