allow restoring files from the recycle bin at the fullscreen view

app/src/main/kotlin/com/simplemobiletools/gallery/activities/ViewPagerActivity.kt

@@ -298,6 +298,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             findItem(R.id.menu_unhide).isVisible = currentMedium.name.startsWith('.')
             findItem(R.id.menu_add_to_favorites).isVisible = !currentMedium.isFavorite && !config.bottomActions
             findItem(R.id.menu_remove_from_favorites).isVisible = currentMedium.isFavorite && !config.bottomActions
+            findItem(R.id.menu_restore_file).isVisible = currentMedium.path.startsWith(filesDir.toString())
             findItem(R.id.menu_lock_orientation).isVisible = mRotationDegrees == 0
             findItem(R.id.menu_lock_orientation).title = getString(if (mIsOrientationLocked) R.string.unlock_orientation else R.string.lock_orientation)
             findItem(R.id.menu_rotate).setShowAsAction(
@@ -336,6 +337,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             R.id.menu_rotate_left -> rotateImage(270)
             R.id.menu_add_to_favorites -> toggleFavorite()
             R.id.menu_remove_from_favorites -> toggleFavorite()
+            R.id.menu_restore_file -> restoreFile()
             R.id.menu_rotate_one_eighty -> rotateImage(180)
             R.id.menu_lock_orientation -> toggleLockOrientation()
             R.id.menu_save_as -> saveImageAs()
@@ -809,6 +811,12 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         }.start()
     }
 
+    private fun restoreFile() {
+        restoreRecycleBinPath(getCurrentPath()) {
+            refreshViewPager()
+        }
+    }
+
     override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
         if (requestCode == REQUEST_EDIT_IMAGE) {
             if (resultCode == Activity.RESULT_OK && resultData != null) {

app/src/main/kotlin/com/simplemobiletools/gallery/extensions/Activity.kt

@@ -16,6 +16,8 @@ import com.simplemobiletools.gallery.activities.SimpleActivity
 import com.simplemobiletools.gallery.dialogs.PickDirectoryDialog
 import com.simplemobiletools.gallery.helpers.NOMEDIA
 import java.io.File
+import java.io.InputStream
+import java.io.OutputStream
 import java.util.*
 
 fun Activity.sharePath(path: String) {
@@ -205,6 +207,35 @@ fun BaseSimpleActivity.movePathsInRecycleBin(paths: ArrayList<String>, callback:
     }.start()
 }
 
+fun BaseSimpleActivity.restoreRecycleBinPath(path: String, callback: () -> Unit) {
+    restoreRecycleBinPaths(arrayListOf(path), callback)
+}
+
+fun BaseSimpleActivity.restoreRecycleBinPaths(paths: ArrayList<String>, callback: () -> Unit) {
+    Thread {
+        val mediumDao = galleryDB.MediumDao()
+        paths.forEach {
+            val source = it
+            val destination = it.removePrefix(filesDir.toString())
+
+            var inputStream: InputStream? = null
+            var out: OutputStream? = null
+            try {
+                out = getFileOutputStreamSync(destination, source.getMimeType())
+                inputStream = getFileInputStreamSync(source)!!
+                inputStream.copyTo(out!!)
+                mediumDao.updateDeleted(destination, 0)
+            } catch (e: Exception) {
+                showErrorToast(e)
+            } finally {
+                inputStream?.close()
+                out?.close()
+            }
+        }
+        callback()
+    }.start()
+}
+
 fun BaseSimpleActivity.emptyTheRecycleBin(callback: (() -> Unit)? = null) {
     Thread {
         filesDir.deleteRecursively()

app/src/main/res/menu/menu_viewpager.xml

@@ -44,6 +44,10 @@
         android:icon="@drawable/ic_star_on"
         android:title="@string/remove_from_favorites"
         app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/menu_restore_file"
+        android:title="@string/restore_this_file"
+        app:showAsAction="never"/>
     <item
         android:id="@+id/menu_lock_orientation"
         android:title="@string/lock_orientation"