implement shutter animation

- remove animation to blink icons
- implement the shutter animation by setting alpha=1 and animating to alpha=0

app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt

@@ -314,9 +314,8 @@ class MainActivity : SimpleActivity(), PhotoProcessor.MediaSavedListener, Camera
         if (mIsInPhotoMode) {
             toggleBottomButtons(true)
             mPreview?.tryTakePicture()
-            capture_black_screen.animate().alpha(0.8f).setDuration(CAPTURE_ANIMATION_DURATION).withEndAction {
-                capture_black_screen.animate().alpha(0f).setDuration(CAPTURE_ANIMATION_DURATION).start()
-            }.start()
+            shutter_animation.alpha = 1.0f
+            shutter_animation.animate().alpha(0f).setDuration(CAPTURE_ANIMATION_DURATION).start()
         } else {
             mPreview?.toggleRecording()
         }
@@ -527,11 +526,6 @@ class MainActivity : SimpleActivity(), PhotoProcessor.MediaSavedListener, Camera
 
     override fun toggleBottomButtons(hide: Boolean) {
         runOnUiThread {
-            val alpha = if (hide) 0f else 1f
-            shutter.animate().alpha(alpha).start()
-            toggle_camera.animate().alpha(alpha).start()
-            toggle_flash.animate().alpha(alpha).start()
-
             shutter.isClickable = !hide
             toggle_camera.isClickable = !hide
             toggle_flash.isClickable = !hide

app/src/main/res/layout/activity_main.xml

@@ -14,7 +14,7 @@
         android:layout_height="match_parent" />
 
     <View
-        android:id="@+id/capture_black_screen"
+        android:id="@+id/shutter_animation"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:alpha="0"