diff --git a/app/src/main/java/com/haishinkit/studio/MainActivity.kt b/app/src/main/java/com/haishinkit/studio/MainActivity.kt
index aff654887..f86913d85 100644
--- a/app/src/main/java/com/haishinkit/studio/MainActivity.kt
+++ b/app/src/main/java/com/haishinkit/studio/MainActivity.kt
@@ -6,8 +6,6 @@ import android.view.MenuItem
 import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import com.google.android.material.bottomnavigation.BottomNavigationView
-import com.haishinkit.graphics.PixelTransformFactory
-import com.haishinkit.vulkan.VkPixelTransform
 
 class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemSelectedListener {
     private var fragment: Fragment? = null
diff --git a/app/src/main/java/com/haishinkit/studio/MediaProjectionService.kt b/app/src/main/java/com/haishinkit/studio/MediaProjectionService.kt
index 95b46b282..b3bfcb10c 100644
--- a/app/src/main/java/com/haishinkit/studio/MediaProjectionService.kt
+++ b/app/src/main/java/com/haishinkit/studio/MediaProjectionService.kt
@@ -7,7 +7,12 @@ import android.app.Service
 import android.content.Intent
 import android.content.pm.ServiceInfo
 import android.media.projection.MediaProjectionManager
-import android.os.*
+import android.os.Build
+import android.os.Handler
+import android.os.IBinder
+import android.os.Looper
+import android.os.Message
+import android.os.Messenger
 import android.util.DisplayMetrics
 import android.util.Log
 import androidx.annotation.RequiresApi
@@ -16,7 +21,6 @@ import com.haishinkit.event.Event
 import com.haishinkit.event.EventUtils
 import com.haishinkit.event.IEventListener
 import com.haishinkit.graphics.filter.BicubicVideoEffect
-import com.haishinkit.graphics.filter.DefaultVideoEffect
 import com.haishinkit.graphics.filter.VideoEffect
 import com.haishinkit.media.AudioRecordSource
 import com.haishinkit.media.MediaProjectionSource
diff --git a/app/src/main/java/com/haishinkit/studio/MediaProjectionTabFragment.kt b/app/src/main/java/com/haishinkit/studio/MediaProjectionTabFragment.kt
index 2f620d215..c6137a365 100644
--- a/app/src/main/java/com/haishinkit/studio/MediaProjectionTabFragment.kt
+++ b/app/src/main/java/com/haishinkit/studio/MediaProjectionTabFragment.kt
@@ -8,7 +8,11 @@ import android.content.Context
 import android.content.Intent
 import android.content.ServiceConnection
 import android.media.projection.MediaProjectionManager
-import android.os.*
+import android.os.Build
+import android.os.Bundle
+import android.os.IBinder
+import android.os.Message
+import android.os.Messenger
 import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
@@ -19,11 +23,8 @@ import androidx.fragment.app.Fragment
 import com.haishinkit.graphics.filter.BicubicVideoEffect
 import com.haishinkit.graphics.filter.BilinearVideoEffect
 import com.haishinkit.graphics.filter.DefaultVideoEffect
-import com.haishinkit.graphics.filter.MonochromeVideoEffect
-import com.haishinkit.net.NetStream
 import com.haishinkit.rtmp.RtmpConnection
 import com.haishinkit.rtmp.RtmpStream
-import java.nio.ByteBuffer
 
 class MediaProjectionTabFragment : Fragment(), ServiceConnection {
     private var messenger: Messenger? = null
@@ -46,13 +47,31 @@ class MediaProjectionTabFragment : Fragment(), ServiceConnection {
         val filter = v.findViewById<Button>(R.id.filter_button)
         filter.setOnClickListener {
             if (filter.text == "Normal") {
-                messenger?.send(Message.obtain(null, MediaProjectionService.MSG_SET_VIDEO_EFFECT, BicubicVideoEffect()))
+                messenger?.send(
+                    Message.obtain(
+                        null,
+                        MediaProjectionService.MSG_SET_VIDEO_EFFECT,
+                        BicubicVideoEffect()
+                    )
+                )
                 filter.text = "Bicubic"
             } else if (filter.text == "Bicubic") {
-                messenger?.send(Message.obtain(null, MediaProjectionService.MSG_SET_VIDEO_EFFECT, BilinearVideoEffect()))
+                messenger?.send(
+                    Message.obtain(
+                        null,
+                        MediaProjectionService.MSG_SET_VIDEO_EFFECT,
+                        BilinearVideoEffect()
+                    )
+                )
                 filter.text = "Bilinear"
             } else {
-                messenger?.send(Message.obtain(null, MediaProjectionService.MSG_SET_VIDEO_EFFECT, DefaultVideoEffect.shared))
+                messenger?.send(
+                    Message.obtain(
+                        null,
+                        MediaProjectionService.MSG_SET_VIDEO_EFFECT,
+                        DefaultVideoEffect.shared
+                    )
+                )
                 filter.text = "Normal"
             }
         }
diff --git a/app/src/main/java/com/haishinkit/studio/PreferenceTagFragment.kt b/app/src/main/java/com/haishinkit/studio/PreferenceTagFragment.kt
index ce33b9858..ccf15a9cb 100644
--- a/app/src/main/java/com/haishinkit/studio/PreferenceTagFragment.kt
+++ b/app/src/main/java/com/haishinkit/studio/PreferenceTagFragment.kt
@@ -6,10 +6,14 @@ import android.graphics.Paint
 import android.graphics.Rect
 import android.os.Bundle
 import android.util.Log
-import android.view.*
+import android.view.Choreographer
+import android.view.LayoutInflater
+import android.view.SurfaceHolder
+import android.view.SurfaceView
+import android.view.View
+import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
-import java.lang.Exception
 
 class PreferenceTagFragment : Fragment(), Choreographer.FrameCallback {
     private lateinit var holderA: SurfaceHolder
@@ -22,7 +26,10 @@ class PreferenceTagFragment : Fragment(), Choreographer.FrameCallback {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        Log.i(TAG, "VkPixelTransform::isSupported() = ${com.haishinkit.vulkan.VkPixelTransform.isSupported()}")
+        Log.i(
+            TAG,
+            "VkPixelTransform::isSupported() = ${com.haishinkit.vulkan.VkPixelTransform.isSupported()}"
+        )
         context?.let {
             Log.d(TAG, "setAssetManager")
             renderer?.assetManager = it.assets
diff --git a/haishinkit/src/main/java/com/haishinkit/graphics/GlPixelTransform.kt b/haishinkit/src/main/java/com/haishinkit/graphics/GlPixelTransform.kt
index 026335fbc..2fadad7bc 100644
--- a/haishinkit/src/main/java/com/haishinkit/graphics/GlPixelTransform.kt
+++ b/haishinkit/src/main/java/com/haishinkit/graphics/GlPixelTransform.kt
@@ -10,7 +10,6 @@ import android.view.Surface
 import com.haishinkit.graphics.filter.VideoEffect
 import com.haishinkit.graphics.gles.Kernel
 import com.haishinkit.graphics.gles.Texture
-import java.lang.RuntimeException
 
 internal class GlPixelTransform : PixelTransform, Choreographer.FrameCallback {
     override var outputSurface: Surface?
diff --git a/vulkan/src/main/java/com/haishinkit/vulkan/VkPixelTransform.kt b/vulkan/src/main/java/com/haishinkit/vulkan/VkPixelTransform.kt
index 28c49a001..fabcf992a 100644
--- a/vulkan/src/main/java/com/haishinkit/vulkan/VkPixelTransform.kt
+++ b/vulkan/src/main/java/com/haishinkit/vulkan/VkPixelTransform.kt
@@ -134,7 +134,8 @@ class VkPixelTransform : PixelTransform {
     external fun inspectDevices(): String
 
     override fun readPixels(lambda: (bitmap: Bitmap?) -> Unit) {
-        val bitmap = Bitmap.createBitmap(imageExtent.width, imageExtent.height, Bitmap.Config.ARGB_8888)
+        val bitmap =
+            Bitmap.createBitmap(imageExtent.width, imageExtent.height, Bitmap.Config.ARGB_8888)
         lambda(bitmap)
     }