diff --git a/app/src/main/java/me/rosuh/easywatermark/ui/MainActivity.kt b/app/src/main/java/me/rosuh/easywatermark/ui/MainActivity.kt
index e8299c58..6f922215 100644
--- a/app/src/main/java/me/rosuh/easywatermark/ui/MainActivity.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/ui/MainActivity.kt
@@ -55,6 +55,8 @@ class MainActivity : AppCompatActivity() {
             cl_root.setTransition(R.id.transition_launch)
             cl_root.transitionToEnd()
             checkHadCrash()
+            // Activity was recycled but dialog still showing in some case?
+            SaveImageBSDialogFragment.safetyHide(this@MainActivity.supportFragmentManager)
         }
     }
 
@@ -229,6 +231,7 @@ class MainActivity : AppCompatActivity() {
 
         val pagerAdapter = ControlPanelPagerAdapter(this, fragmentArray)
         vp_control_panel.apply {
+            isUserInputEnabled = false
             offscreenPageLimit = 2
             adapter = pagerAdapter
         }
diff --git a/app/src/main/java/me/rosuh/easywatermark/ui/MainViewModel.kt b/app/src/main/java/me/rosuh/easywatermark/ui/MainViewModel.kt
index d85ab5d7..9725b7e3 100644
--- a/app/src/main/java/me/rosuh/easywatermark/ui/MainViewModel.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/ui/MainViewModel.kt
@@ -12,7 +12,6 @@ import android.net.Uri
 import android.os.Build
 import android.os.Environment
 import android.provider.MediaStore
-import android.util.Log
 import android.widget.Toast
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
@@ -372,19 +371,11 @@ class MainViewModel : ViewModel() {
                         input?.copyTo(output)
                     }
                 }
-                Log.i(
-                    "compressImg",
-                    "Before compress: file ${tmpFile.absolutePath}, length = ${tmpFile.length()}"
-                )
                 val compressedFile = Compressor.compress(activity, tmpFile)
                 // clear tmp files
                 if (tmpFile.exists()) {
                     tmpFile.delete()
                 }
-                Log.i(
-                    "compressImg",
-                    "After compress: compressedFile ${compressedFile.absolutePath}, length = ${compressedFile.length()}"
-                )
                 try {
                     val compressedFileUri = FileProvider.getUriForFile(
                         activity,
diff --git a/app/src/main/java/me/rosuh/easywatermark/ui/dialog/SaveImageBSDialogFragment.kt b/app/src/main/java/me/rosuh/easywatermark/ui/dialog/SaveImageBSDialogFragment.kt
index 1cbe752e..11c4a166 100644
--- a/app/src/main/java/me/rosuh/easywatermark/ui/dialog/SaveImageBSDialogFragment.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/ui/dialog/SaveImageBSDialogFragment.kt
@@ -129,6 +129,12 @@ class SaveImageBSDialogFragment : BottomSheetDialogFragment() {
             return SaveImageBSDialogFragment()
         }
 
+        fun safetyHide(manager: FragmentManager) {
+            kotlin.runCatching {
+                (manager.findFragmentByTag(TAG) as? SaveImageBSDialogFragment)?.dismissAllowingStateLoss()
+            }
+        }
+
         fun safetyShow(manager: FragmentManager) {
             try {
                 val f = manager.findFragmentByTag(TAG) as? SaveImageBSDialogFragment
diff --git a/app/src/main/java/me/rosuh/easywatermark/ui/panel/ContentFragment.kt b/app/src/main/java/me/rosuh/easywatermark/ui/panel/ContentFragment.kt
index a5264b24..65e50642 100644
--- a/app/src/main/java/me/rosuh/easywatermark/ui/panel/ContentFragment.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/ui/panel/ContentFragment.kt
@@ -68,16 +68,16 @@ class ContentFragment : BaseFragment() {
             with(shareViewModel.config.value?.textSize ?: 14f) {
                 progress = this.toInt()
             }
-            setOnSeekBarChangeListener(object : DetectedPerformanceSeekBarListener(
-                config
+            setOnSeekBarChangeListener(object : DetectedPerformanceSeekBarListener(config) {
 
-            ) {
             }.apply {
                 inTimeAction = { _: SeekBar?, _: Int, _: Boolean ->
                     tvContentSize.text = progress.toString()
                 }
-                postAction = { _: SeekBar?, _: Int ->
-                    shareViewModel.updateTextSize(progress.toFloat())
+                postAction = { _: SeekBar?, _: Int, fromUser: Boolean ->
+                    if (fromUser) {
+                        shareViewModel.updateTextSize(progress.toFloat())
+                    }
                 }
             })
         }
diff --git a/app/src/main/java/me/rosuh/easywatermark/ui/panel/LayoutFragment.kt b/app/src/main/java/me/rosuh/easywatermark/ui/panel/LayoutFragment.kt
index 4feba82f..230143c9 100644
--- a/app/src/main/java/me/rosuh/easywatermark/ui/panel/LayoutFragment.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/ui/panel/LayoutFragment.kt
@@ -35,7 +35,7 @@ class LayoutFragment : BaseFragment() {
                 inTimeAction = { seekBar: SeekBar?, _: Int, _: Boolean ->
                     tvProgressHorizon.text = seekBar?.progress.toString()
                 }
-                postAction = { seekBar: SeekBar?, _: Int ->
+                postAction = { seekBar: SeekBar?, _: Int, _ ->
                     shareViewModel.updateHorizon(seekBar?.progress ?: 0)
                 }
             })
@@ -54,7 +54,7 @@ class LayoutFragment : BaseFragment() {
                     tvProgressVertical.text =
                         seekBar?.progress.toString()
                 }
-                postAction = { seekBar: SeekBar?, _: Int ->
+                postAction = { seekBar: SeekBar?, _: Int, _ ->
                     shareViewModel.updateVertical(seekBar?.progress ?: 0)
                 }
             })
diff --git a/app/src/main/java/me/rosuh/easywatermark/ui/panel/StyleFragment.kt b/app/src/main/java/me/rosuh/easywatermark/ui/panel/StyleFragment.kt
index 1a1a3450..d7480737 100644
--- a/app/src/main/java/me/rosuh/easywatermark/ui/panel/StyleFragment.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/ui/panel/StyleFragment.kt
@@ -70,8 +70,32 @@ class StyleFragment : BaseFragment() {
                 inTimeAction = { _: SeekBar?, _: Int, _: Boolean ->
                     tvDegree.text = "${shareViewModel.config.value?.degree ?: 0}°"
                 }
-                postAction =
-                    { _: SeekBar?, _: Int -> shareViewModel.updateDegree(progress.toFloat()) }
+                postAction = { _: SeekBar?, _: Int, fromUser: Boolean ->
+                    if (fromUser) {
+                        shareViewModel.updateDegree(progress.toFloat())
+                    }
+                }
+            })
+        }
+
+        val tvAlpha = root.findViewById<TextView>(R.id.tv_tips_alpha).apply {
+            text = "${getAlphaValue()}%"
+        }
+        val sbAlpha = root.findViewById<SeekBar>(R.id.sb_alpha).apply {
+            progress = getAlphaValue()
+            setOnSeekBarChangeListener(object :
+                DetectedPerformanceSeekBarListener(
+                    config
+                ) {
+            }.apply {
+                inTimeAction = { _: SeekBar?, p: Int, _: Boolean ->
+                    tvAlpha.text = "${p}%"
+                }
+                postAction = { _: SeekBar?, p: Int, fromUser: Boolean ->
+                    if (fromUser) {
+                        shareViewModel.updateAlpha((p.toFloat() / 100 * 255).toInt())
+                    }
+                }
             })
         }
 
@@ -95,9 +119,29 @@ class StyleFragment : BaseFragment() {
                 }
             }
         }
+        initObserver(sbAlpha, tvAlpha)
         return root
     }
 
+    private fun getAlphaValue(): Int {
+        return ((shareViewModel.config.value?.alpha ?: 255).toFloat() / 255 * 100).toInt()
+            .coerceAtLeast(0).coerceAtMost(100)
+    }
+
+    private fun initObserver(
+        sbAlpha: SeekBar,
+        tvAlpha: TextView
+    ) {
+        shareViewModel.config.observe(viewLifecycleOwner, {
+            with(it.alpha) {
+                val intAlpha =
+                    (this.toFloat() / 255 * 100).toInt().coerceAtLeast(0).coerceAtMost(100)
+                sbAlpha.progress = intAlpha
+                tvAlpha.text = "${intAlpha}%"
+            }
+        })
+    }
+
     private fun showColorPickerDialog(adapter: ColorPreviewAdapter) {
         ColorPickerDialog.Builder(
             activity,
diff --git a/app/src/main/java/me/rosuh/easywatermark/utils/DetectedPerformanceSeekBarListener.kt b/app/src/main/java/me/rosuh/easywatermark/utils/DetectedPerformanceSeekBarListener.kt
index 60c20390..8680d42f 100644
--- a/app/src/main/java/me/rosuh/easywatermark/utils/DetectedPerformanceSeekBarListener.kt
+++ b/app/src/main/java/me/rosuh/easywatermark/utils/DetectedPerformanceSeekBarListener.kt
@@ -23,7 +23,7 @@ open class DetectedPerformanceSeekBarListener(
 
     var inTimeAction: (SeekBar?, Int, Boolean) -> Unit = { _, _, _ -> }
 
-    var postAction: (SeekBar?, Int) -> Unit = { _, _ -> }
+    var postAction: (SeekBar?, Int, Boolean) -> Unit = { _, _, _ -> }
 
     private var isHighPerformancePredicate: () -> Boolean = {
         config?.markMode == WaterMarkConfig.MarkMode.Text
@@ -32,7 +32,7 @@ open class DetectedPerformanceSeekBarListener(
 
     override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
         if (isHighPerformancePredicate()) {
-            seekBar?.progress?.let { postAction.invoke(seekBar, it) }
+            seekBar?.progress?.let { postAction.invoke(seekBar, it, fromUser) }
         }
         inTimeAction.invoke(seekBar, progress, fromUser)
     }
@@ -43,7 +43,7 @@ open class DetectedPerformanceSeekBarListener(
 
     override fun onStopTrackingTouch(seekBar: SeekBar?) {
         if (!isHighPerformancePredicate()) {
-            seekBar?.progress?.let { postAction.invoke(seekBar, it) }
+            seekBar?.progress?.let { postAction.invoke(seekBar, it, true) }
         }
     }
 
diff --git a/app/src/main/res/layout/fragment_style.xml b/app/src/main/res/layout/fragment_style.xml
index 7289194a..70623285 100644
--- a/app/src/main/res/layout/fragment_style.xml
+++ b/app/src/main/res/layout/fragment_style.xml
@@ -1,66 +1,108 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:padding="20dp"
-    tools:background="#161616">
+    android:layout_height="match_parent"
+    android:animateLayoutChanges="true"
+    android:paddingBottom="12dp"
+    android:scrollbars="vertical">
 
-    <TextView
-        android:id="@+id/tv_title_color"
-        style="@style/AppTheme.TitleText"
-        android:layout_width="wrap_content"
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="8dp"
-        android:text="@string/title_text_color"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        android:padding="20dp"
+        tools:background="#161616">
 
+        <TextView
+            android:id="@+id/tv_title_color"
+            style="@style/AppTheme.TitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/title_text_color"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
 
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/rv_color"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
-        app:layout_constraintTop_toBottomOf="@+id/tv_title_color"
-        tools:itemCount="4"
-        tools:listitem="@layout/item_color_preview"
-        tools:orientation="horizontal" />
 
-    <TextView
-        android:id="@+id/tv_title_degree"
-        style="@style/AppTheme.TitleText"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="16dp"
-        android:text="@string/title_text_rotate"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/rv_color" />
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/rv_color"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/tv_title_color"
+            tools:itemCount="4"
+            tools:listitem="@layout/item_color_preview"
+            tools:orientation="horizontal" />
 
-    <TextView
-        android:id="@+id/tv_tips_degree"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="@string/text_zero_degree"
-        android:textAlignment="center"
-        app:layout_constraintBottom_toBottomOf="@+id/tv_title_degree"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toTopOf="@+id/tv_title_degree" />
+        <TextView
+            android:id="@+id/tv_title_alpha"
+            style="@style/AppTheme.TitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:text="@string/style_alpha"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/rv_color" />
+
+        <TextView
+            android:id="@+id/tv_tips_alpha"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="100"
+            android:textAlignment="center"
+            app:layout_constraintBottom_toBottomOf="@+id/tv_title_alpha"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toTopOf="@+id/tv_title_alpha" />
+
+        <androidx.appcompat.widget.AppCompatSeekBar
+            android:id="@+id/sb_alpha"
+            style="@style/MySeekBarStyle"
+            android:layout_width="0dp"
+            android:layout_height="20dp"
+            android:layout_marginTop="10dp"
+            android:background="#fff"
+            android:max="100"
+            android:progress="100"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="@+id/tv_title_alpha"
+            app:layout_constraintTop_toBottomOf="@+id/tv_tips_alpha" />
+
+        <TextView
+            android:id="@+id/tv_title_degree"
+            style="@style/AppTheme.TitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:text="@string/title_text_rotate"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/sb_alpha" />
+
+        <TextView
+            android:id="@+id/tv_tips_degree"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/text_zero_degree"
+            android:textAlignment="center"
+            app:layout_constraintBottom_toBottomOf="@+id/tv_title_degree"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toTopOf="@+id/tv_title_degree" />
+
+        <androidx.appcompat.widget.AppCompatSeekBar
+            android:id="@+id/sb_degree"
+            style="@style/MySeekBarStyle"
+            android:layout_width="0dp"
+            android:layout_height="20dp"
+            android:layout_marginTop="10dp"
+            android:background="#fff"
+            android:max="360"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="@+id/tv_title_degree"
+            app:layout_constraintTop_toBottomOf="@+id/tv_title_degree" />
 
-    <androidx.appcompat.widget.AppCompatSeekBar
-        android:id="@+id/sb_degree"
-        style="@style/MySeekBarStyle"
-        android:layout_width="0dp"
-        android:layout_height="20dp"
-        android:layout_marginTop="10dp"
-        android:background="#fff"
-        android:max="360"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="@+id/tv_title_degree"
-        app:layout_constraintTop_toBottomOf="@+id/tv_title_degree" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
+</androidx.core.widget.NestedScrollView>
\ No newline at end of file
diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index cc5ff99f..dd2cf1b4 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -60,4 +60,5 @@
     <string name="tip_not_mail_found">It seems that there is no mail client installed, you can actively paste the error message to the app market or Github</string>
     <string name="tips_content_size_performance">The larger the size, the more demanding the real-time preview performance.</string>
     <string name="config_default_water_mark_text">👋Photos are for testing purposes only.</string>
+    <string name="style_alpha">Alpha</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6e7eb4d2..054f964a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -69,4 +69,5 @@
     <string name="email_subject" translatable="false">[EasyWaterMark] Crash info</string>
     <string name="tips_content_size_performance">尺寸越大，实时预览性能要求越高</string>
     <string name="config_default_water_mark_text">👋图片仅供测试，请勿作其他用途</string>
+    <string name="style_alpha">透明度</string>
 </resources>
\ No newline at end of file