fix empty gallery issue

app/src/main/java/app/grapheneos/camera/CamConfig.kt

@@ -640,6 +640,15 @@ class CamConfig(private val mActivity: MainActivity) {
         lastCapturedItem = item
     }
 
+    fun clearLastCapturedItem() {
+        commonPref.edit {
+            remove(SettingValues.Key.LAST_CAPTURED_ITEM_TYPE)
+            remove(SettingValues.Key.LAST_CAPTURED_ITEM_DATE_STRING)
+            remove(SettingValues.Key.LAST_CAPTURED_ITEM_URI)
+        }
+        lastCapturedItem = null
+    }
+
     var requireLocation: Boolean = false
         get() {
             return mActivity.settingsDialog.locToggle.isChecked

app/src/main/java/app/grapheneos/camera/GallerySliderAdapter.kt

@@ -119,6 +119,7 @@ class GallerySliderAdapter(
             gActivity.showMessage(
                 gActivity.getString(R.string.existing_no_image)
             )
+            gActivity.setEmptyGalleryResult()
             gActivity.finish()
         }
 

app/src/main/java/app/grapheneos/camera/ui/activities/InAppGallery.kt

@@ -3,6 +3,7 @@ package app.grapheneos.camera.ui.activities
 import android.animation.ArgbEvaluator
 import android.animation.ValueAnimator
 import android.annotation.SuppressLint
+import android.app.Activity
 import android.content.ActivityNotFoundException
 import android.content.Context
 import android.content.Intent
@@ -84,6 +85,7 @@ class InAppGallery : AppCompatActivity() {
         const val INTENT_KEY_LAST_CAPTURED_ITEM = "last_captured_item"
 
         const val LAST_VIEWED_ITEM_KEY = "LAST_VIEWED_ITEM_KEY"
+        const val EMPTY_GALLERY = "empty_gallery"
 
         @SuppressLint("SimpleDateFormat")
         fun convertTime(time: Long, showTimeZone: Boolean = true): String {
@@ -559,13 +561,20 @@ class InAppGallery : AppCompatActivity() {
         showUI()
     }
 
+    fun setEmptyGalleryResult() {
+        val resultIntent = Intent()
+        resultIntent.putExtra(EMPTY_GALLERY, true)
+        setResult(Activity.RESULT_OK, resultIntent)
+    }
+
     fun asyncResultReady(items: ArrayList<CapturedItem>) {
         if (isDestroyed) {
             return
         }
 
         if (items.isEmpty()) {
             Toast.makeText(applicationContext, R.string.empty_gallery, Toast.LENGTH_SHORT).show()
+            setEmptyGalleryResult()
             finish()
             return
         }

app/src/main/java/app/grapheneos/camera/ui/activities/MainActivity.kt

@@ -269,6 +269,19 @@ open class MainActivity : AppCompatActivity(),
         }
     }
 
+    private val galleryLauncher = registerForActivityResult(
+        ActivityResultContracts.StartActivityForResult()
+    ) { result ->
+        if (result.resultCode == RESULT_OK) {
+            val data = result.data
+            Log.i(TAG, "Gallery result: ${data?.getBooleanExtra(InAppGallery.EMPTY_GALLERY, false)}")
+            if (data?.getBooleanExtra(InAppGallery.EMPTY_GALLERY, false) == true) {
+                Log.i(TAG, "Gallery is empty.")
+                camConfig.clearLastCapturedItem()
+            }
+        }
+    }
+
     // Used to request permission from the user
     private val requestPermissionLauncher = registerForActivityResult(
         RequestMultiplePermissions()
@@ -421,14 +434,18 @@ open class MainActivity : AppCompatActivity(),
                 }
                 it.putParcelableArrayListExtra(InAppGallery.INTENT_KEY_LIST_OF_SECURE_MODE_CAPTURED_ITEMS, list)
             } else {
+                if(camConfig.lastCapturedItem == null) {
+                    showMessage(R.string.no_image)
+                    return
+                }
                 it.putExtra(InAppGallery.INTENT_KEY_VIDEO_ONLY_MODE, requiresVideoModeOnly)
             }
 
             if (isThumbnailLoaded) { // indicates that last captured item is accessible
                 it.putExtra(InAppGallery.INTENT_KEY_LAST_CAPTURED_ITEM, camConfig.lastCapturedItem)
             }
 
-            startActivity(it)
+            galleryLauncher.launch(it)
         }
 
     }