diff --git a/app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt b/app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt
index 7728823..e290d47 100644
--- a/app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt
+++ b/app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt
@@ -1,5 +1,6 @@
 package sushi.hardcore.droidfs
 
+import android.content.Intent
 import android.graphics.Color
 import android.os.Bundle
 import android.text.InputType
@@ -41,9 +42,9 @@ class CameraActivity : BaseActivity() {
         set(value) {
             field = value
             if (value > 0){
-                image_timer.setColorFilter(Color.GREEN)
+                image_timer.setImageResource(R.drawable.icon_timer_on)
             } else {
-                image_timer.clearColorFilter()
+                image_timer.setImageResource(R.drawable.icon_timer_off)
             }
         }
     private lateinit var gocryptfsVolume: GocryptfsVolume
@@ -149,7 +150,12 @@ class CameraActivity : BaseActivity() {
             .setView(dialogEditTextView)
             .setTitle(getString(R.string.enter_timer_duration))
             .setPositiveButton(R.string.ok) { _, _ ->
-                timerDuration = dialogEditText.text.toString().toInt()
+                val enteredValue = dialogEditText.text.toString()
+                if (enteredValue.isEmpty()){
+                    Toast.makeText(this, getString(R.string.timer_empty_error_msg), Toast.LENGTH_SHORT).show()
+                } else {
+                    timerDuration = enteredValue.toInt()
+                }
             }
             .setNegativeButton(R.string.cancel, null)
             .create()
@@ -167,13 +173,14 @@ class CameraActivity : BaseActivity() {
             .setTitle(getString(R.string.choose_grid))
             .setSingleChoiceItems(gridTitles.map { getString(it) as CharSequence }.toTypedArray(), gridValues.indexOf(camera.grid)){ dialog, which ->
                 camera.grid = gridValues[which]
+                image_grid.setImageResource(if (camera.grid == Grid.OFF){ R.drawable.icon_grid_off } else { R.drawable.icon_grid_on })
                 dialog.dismiss()
             }
             .setNegativeButton(R.string.cancel, null)
             .show()
     }
 
-    fun onClickFilter(view: View) {
+    private fun openFilterDialog(){
         ColoredAlertDialogBuilder(this)
             .setTitle(getString(R.string.choose_filter))
             .setSingleChoiceItems(filterNames, currentFilterIndex){ dialog, which ->
@@ -185,6 +192,22 @@ class CameraActivity : BaseActivity() {
             .show()
     }
 
+    fun onClickFilter(view: View) {
+        if (sharedPrefs.getBoolean("filtersFirstOpening", true)){
+            ColoredAlertDialogBuilder(this)
+                .setTitle(R.string.warning)
+                .setMessage(R.string.filters_warning)
+                .setPositiveButton(R.string.ok){ _, _ ->
+                    sharedPrefs.edit().putBoolean("filtersFirstOpening", false).apply()
+                    openFilterDialog()
+                }
+                .setNegativeButton(R.string.cancel, null)
+                .show()
+        } else {
+            openFilterDialog()
+        }
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         if (!isFinishingIntentionally) {
diff --git a/app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt b/app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt
index a40d63d..e8d4c45 100644
--- a/app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt
+++ b/app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt
@@ -43,7 +43,7 @@ class MainActivity : BaseActivity() {
                     .setTitle(R.string.warning)
                     .setMessage(R.string.usf_home_warning_msg)
                     .setCancelable(false)
-                    .setPositiveButton(getString(R.string.see_unsafe_features)){ _, _ ->
+                    .setPositiveButton(R.string.see_unsafe_features){ _, _ ->
                         val intent = Intent(this, SettingsActivity::class.java)
                         intent.putExtra("screen", "UnsafeFeaturesSettingsFragment")
                         startActivity(intent)
diff --git a/app/src/main/java/sushi/hardcore/droidfs/explorers/BaseExplorerActivity.kt b/app/src/main/java/sushi/hardcore/droidfs/explorers/BaseExplorerActivity.kt
index 5a25184..c8fc145 100644
--- a/app/src/main/java/sushi/hardcore/droidfs/explorers/BaseExplorerActivity.kt
+++ b/app/src/main/java/sushi/hardcore/droidfs/explorers/BaseExplorerActivity.kt
@@ -194,6 +194,7 @@ open class BaseExplorerActivity : BaseActivity() {
                 }
             }
             total_size_text.text = getString(R.string.total_size, PathUtils.formatSize(totalSize))
+            explorerAdapter.notifyDataSetChanged()
         }.start()
     }
 
diff --git a/app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt b/app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt
index 3f5864f..bad2be0 100644
--- a/app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt
+++ b/app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt
@@ -211,7 +211,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                                             }
                                         }
                                     }
-                                    .setNegativeButton(getString(R.string.no), null)
+                                    .setNegativeButton(R.string.no, null)
                                     .show()
                             }
                         }
diff --git a/app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt b/app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt
index ee86816..04c311c 100644
--- a/app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt
+++ b/app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt
@@ -69,7 +69,7 @@ abstract class FileViewerActivity: BaseActivity() {
                     .setTitle(R.string.error)
                     .setMessage(R.string.outofmemoryerror_msg)
                     .setCancelable(false)
-                    .setPositiveButton(getString(R.string.ok)) { _, _ -> goBackToExplorer() }
+                    .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
                     .show()
             }
 
@@ -106,4 +106,4 @@ abstract class FileViewerActivity: BaseActivity() {
         super.onBackPressed()
         isFinishingIntentionally = true
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt b/app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt
index afd49fd..08649ac 100644
--- a/app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt
+++ b/app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt
@@ -34,7 +34,7 @@ class TextEditor: FileViewerActivity() {
                     .setTitle(R.string.error)
                     .setMessage(R.string.outofmemoryerror_msg)
                     .setCancelable(false)
-                    .setPositiveButton(getString(R.string.ok)) { _, _ -> goBackToExplorer()}
+                    .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer()}
                     .show()
             }
         }
@@ -101,12 +101,12 @@ class TextEditor: FileViewerActivity() {
             ColoredAlertDialogBuilder(this)
                 .setTitle(R.string.warning)
                 .setMessage(R.string.ask_save)
-                .setPositiveButton(getString(R.string.save)) { _, _ ->
+                .setPositiveButton(R.string.save) { _, _ ->
                     if (save()){
                         goBackToExplorer()
                     }
                 }
-                .setNegativeButton(getString(R.string.discard)){ _, _ -> goBackToExplorer()}
+                .setNegativeButton(R.string.discard){ _, _ -> goBackToExplorer()}
                 .show()
         } else {
             goBackToExplorer()
@@ -144,4 +144,4 @@ class TextEditor: FileViewerActivity() {
     override fun onBackPressed() {
         checkSaveAndExit()
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/res/drawable/icon_grid_off.xml b/app/src/main/res/drawable/icon_grid_off.xml
new file mode 100644
index 0000000..e247223
--- /dev/null
+++ b/app/src/main/res/drawable/icon_grid_off.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M8,4v1.45l2,2L10,4h4v4h-3.45l2,2L14,10v1.45l2,2L16,10h4v4h-3.45l2,2L20,16v1.45l2,2L22,4c0,-1.1 -0.9,-2 -2,-2L4.55,2l2,2L8,4zM16,4h4v4h-4L16,4zM1.27,1.27L0,2.55l2,2L2,20c0,1.1 0.9,2 2,2h15.46l2,2 1.27,-1.27L1.27,1.27zM10,12.55L11.45,14L10,14v-1.45zM4,6.55L5.45,8L4,8L4,6.55zM8,20L4,20v-4h4v4zM8,14L4,14v-4h3.45l0.55,0.55L8,14zM14,20h-4v-4h3.45l0.55,0.54L14,20zM16,20v-1.46L17.46,20L16,20z"/>
+</vector>
diff --git a/app/src/main/res/drawable/icon_timer.xml b/app/src/main/res/drawable/icon_timer.xml
deleted file mode 100644
index 04584e8..0000000
--- a/app/src/main/res/drawable/icon_timer.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<vector android:height="24dp" android:tint="#FFFFFF"
-    android:viewportHeight="24" android:viewportWidth="24"
-    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
-    <path android:fillColor="@android:color/white" android:pathData="M11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"/>
-    <path android:fillColor="@android:color/white" android:pathData="M12.5,7H11v6l5.25,3.15 0.75,-1.23 -4.5,-2.67z"/>
-</vector>
diff --git a/app/src/main/res/drawable/icon_timer_off.xml b/app/src/main/res/drawable/icon_timer_off.xml
new file mode 100644
index 0000000..c325717
--- /dev/null
+++ b/app/src/main/res/drawable/icon_timer_off.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="48"
+    android:viewportHeight="48">
+  <path
+      android:fillColor="#FFFFFF"
+      android:pathData="M38.07,9.1l-2.85,2.85c-3.07,-2.47 -6.98,-3.95 -11.23,-3.95 -3.66,0 -7.05,1.1 -9.89,2.97l2.91,2.91c2.06,-1.19 4.44,-1.88 6.99,-1.88 7.73,0 14,6.27 14,14 0,2.55 -0.69,4.93 -1.88,6.99l2.91,2.91c1.87,-2.84 2.97,-6.24 2.97,-9.9 0,-4.25 -1.48,-8.15 -3.95,-11.23l2.85,-2.85 -2.83,-2.82zM30,2h-12v4h12v-4zM22,18.87l4,4v-6.87h-4v2.87zM6.04,8l-2.55,2.54 5.51,5.51c-1.89,2.85 -3,6.27 -3,9.95 0,9.94 8.04,18 17.99,18 3.68,0 7.1,-1.11 9.95,-3l5,5 2.54,-2.55 -15.4,-15.41 -20.04,-20.04zM24,40c-7.73,0 -14,-6.27 -14,-14 0,-2.57 0.7,-4.97 1.91,-7.04l19.13,19.13c-2.07,1.21 -4.47,1.91 -7.04,1.91z"/>
+</vector>
diff --git a/app/src/main/res/drawable/icon_timer_on.xml b/app/src/main/res/drawable/icon_timer_on.xml
new file mode 100644
index 0000000..818e299
--- /dev/null
+++ b/app/src/main/res/drawable/icon_timer_on.xml
@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="18dp"
+    android:height="23dp"
+    android:viewportWidth="18"
+    android:viewportHeight="23">
+  <path
+      android:pathData="M12,0.5L6,0.5L6,2.5L12,2.5L12,0.5L12,0.5ZM8,13.5L10,13.5L10,7.5L8,7.5L8,13.5L8,13.5ZM16,6.9L17.5,5.5C17,5 16.5,4.5 16,4.1L14.6,5.5C13.1,4.3 11.1,3.5 9,3.5C4,3.5 0,7.5 0,12.5C0,17.5 4,21.5 9,21.5C14,21.5 18,17.5 18,12.5C18,10.4 17.3,8.4 16,6.9L16,6.9ZM9,19.5C5.1,19.5 2,16.4 2,12.5C2,8.6 5.1,5.5 9,5.5C12.9,5.5 16,8.6 16,12.5C16,16.4 12.9,19.5 9,19.5L9,19.5Z"
+      android:strokeWidth="1"
+      android:fillColor="#FFFFFF"
+      android:fillType="evenOdd"
+      android:strokeColor="#00000000"/>
+</vector>
diff --git a/app/src/main/res/layout/activity_camera.xml b/app/src/main/res/layout/activity_camera.xml
index afe5493..602e8c4 100644
--- a/app/src/main/res/layout/activity_camera.xml
+++ b/app/src/main/res/layout/activity_camera.xml
@@ -38,7 +38,7 @@
             android:layout_width="30dp"
             android:layout_height="30dp"
             android:onClick="onClickTimer"
-            android:src="@drawable/icon_timer"
+            android:src="@drawable/icon_timer_off"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@id/image_grid"
             app:layout_constraintStart_toEndOf="@id/image_hdr"
@@ -49,7 +49,7 @@
             android:layout_width="30dp"
             android:layout_height="30dp"
             android:onClick="onClickGrid"
-            android:src="@drawable/icon_grid_on"
+            android:src="@drawable/icon_grid_off"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@+id/image_filter"
             app:layout_constraintStart_toEndOf="@+id/image_timer"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1a1e34c..12fa7e5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -161,4 +161,6 @@
     <string name="grid_4x4">4x4</string>
     <string name="choose_grid">Choose grid</string>
     <string name="choose_filter">Choose filter</string>
+    <string name="filters_warning">Filters can only be applied to reduced quality images. If you want to take high definition photos, do not apply any filters.</string>
+    <string name="timer_empty_error_msg">Please enter a numeric value</string>
 </resources>