feat(scan): orientation support

appscan/src/main/AndroidManifest.xml

@@ -2,19 +2,18 @@
 <!--
   ~ Nextcloud - Android Client
   ~
+  ~ SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
   ~ SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
   ~ SPDX-FileCopyrightText: 2023 Álvaro Brey <alvaro@alvarobrey.com>
   ~ SPDX-License-Identifier: AGPL-3.0-or-later OR GPL-2.0-only
 -->
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application>
         <activity
             android:name=".AppScanActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.NoActionBar"
-            tools:ignore="LockedOrientationActivity" />
+            android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|uiMode|density|fontScale|keyboard|keyboardHidden"
+            android:theme="@style/Theme.AppCompat.NoActionBar" />
     </application>
 
 </manifest>

appscan/src/main/java/com/nextcloud/appscan/AppScanActivity.kt

@@ -8,11 +8,19 @@
  */
 package com.nextcloud.appscan
 
-import android.app.Activity
 import android.content.Intent
 import android.content.pm.PackageManager
+import android.content.res.Configuration
+import android.graphics.Bitmap
+import android.graphics.PointF
+import android.graphics.drawable.BitmapDrawable
 import android.os.Bundle
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import androidx.core.view.children
 import com.nextcloud.android.common.ui.util.extensions.applyEdgeToEdgeWithSystemBarPadding
+import com.zynksoftware.documentscanner.R
 import com.zynksoftware.documentscanner.ScanActivity
 import com.zynksoftware.documentscanner.model.DocumentScannerErrorModel
 import com.zynksoftware.documentscanner.model.ScannerResults
@@ -22,16 +30,57 @@ import com.zynksoftware.documentscanner.ui.DocumentScanner
 class AppScanActivity : ScanActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         applyEdgeToEdgeWithSystemBarPadding()
-        super.onCreate(savedInstanceState)
+        super.onCreate(null)
         DocumentScanner.init(this)
         addFragmentContentLayout()
     }
 
-    override fun onError(error: DocumentScannerErrorModel) {
-        // TODO pass this from app somehow?
-        println(error)
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        recreateCropFragmentView()
     }
 
+    private fun recreateCropFragmentView() {
+        val cropFragment = supportFragmentManager.findFragmentByTag(IMAGE_CROP_FRAGMENT_TAG) ?: return
+        if (!cropFragment.isVisible) {
+            return
+        }
+
+        val cornerFractions = cropFragment.view?.let(::cropCornerFractions)
+
+        supportFragmentManager.beginTransaction().detach(cropFragment).commitNow()
+        supportFragmentManager.beginTransaction().attach(cropFragment).commitNow()
+
+        val cropView = cropFragment.view ?: return
+        if (cornerFractions == null) {
+            return
+        }
+
+        cropView.post { restoreCropCorners(cropView, cornerFractions) }
+    }
+
+    private fun cropCornerFractions(cropView: View): List<PointF>? {
+        val preview = cropPreviewBitmap(cropView) ?: return null
+        return cropCornerHandles(cropView).map { PointF(it.x / preview.width, it.y / preview.height) }
+    }
+
+    private fun restoreCropCorners(cropView: View, cornerFractions: List<PointF>) {
+        val preview = cropPreviewBitmap(cropView) ?: return
+        cropCornerHandles(cropView).zip(cornerFractions) { handle, fraction ->
+            handle.x = fraction.x * preview.width
+            handle.y = fraction.y * preview.height
+        }
+        cropView.findViewById<View>(R.id.polygonView).invalidate()
+    }
+
+    private fun cropPreviewBitmap(cropView: View): Bitmap? =
+        (cropView.findViewById<ImageView>(R.id.imagePreview).drawable as? BitmapDrawable)?.bitmap
+
+    private fun cropCornerHandles(cropView: View): List<View> =
+        cropView.findViewById<ViewGroup>(R.id.polygonView).children.toList()
+
+    override fun onError(error: DocumentScannerErrorModel) = Unit
+
     override fun onSuccess(scannerResults: ScannerResults) {
         val intent = Intent()
 
@@ -40,12 +89,16 @@ class AppScanActivity : ScanActivity() {
             scannerResults.transformedImageFile?.absolutePath ?: scannerResults.croppedImageFile?.absolutePath
         )
 
-        setResult(Activity.RESULT_OK, intent)
+        setResult(RESULT_OK, intent)
         finish()
     }
 
     override fun onClose() {
-        setResult(Activity.RESULT_CANCELED)
+        if (isChangingConfigurations) {
+            return
+        }
+
+        setResult(RESULT_CANCELED)
         finish()
     }
 
@@ -63,5 +116,7 @@ class AppScanActivity : ScanActivity() {
         val enabled: Boolean = true
 
         const val EXTRA_FILE = "file"
+
+        private const val IMAGE_CROP_FRAGMENT_TAG = "ImageCropFragmentTag"
     }
 }