diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/AddDeleteDrawable.kt b/app/src/main/java/com/hippo/ehviewer/ui/legacy/AddDeleteDrawable.kt
index 067b4fc60..ed4998a70 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/legacy/AddDeleteDrawable.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/legacy/AddDeleteDrawable.kt
@@ -13,154 +13,136 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package com.hippo.ehviewer.ui.legacy
 
-package com.hippo.ehviewer.ui.legacy;
+import android.animation.ObjectAnimator
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.ColorFilter
+import android.graphics.Paint
+import android.graphics.Path
+import android.graphics.PixelFormat
+import android.graphics.drawable.Drawable
+import androidx.annotation.Keep
+import com.google.android.material.math.MathUtils
+import com.hippo.ehviewer.R
+import kotlin.math.roundToInt
 
-import android.animation.ObjectAnimator;
-import android.content.Context;
-import android.content.res.Resources;
-import android.graphics.Canvas;
-import android.graphics.ColorFilter;
-import android.graphics.Paint;
-import android.graphics.Path;
-import android.graphics.PixelFormat;
-import android.graphics.Rect;
-import android.graphics.drawable.Drawable;
-
-import androidx.annotation.Keep;
-
-import com.google.android.material.math.MathUtils;
-import com.hippo.ehviewer.R;
-
-public class AddDeleteDrawable extends Drawable {
-
-    private final Paint mPaint = new Paint();
-    private final Path mPath = new Path();
-
-    private final int mSize;
-
-    private float mProgress;
-
-    private boolean mAutoUpdateMirror = false;
-    private boolean mVerticalMirror = false;
-
-    /**
-     * @param context used to get the configuration for the drawable from
-     */
-    public AddDeleteDrawable(Context context, int color) {
-        Resources resources = context.getResources();
-
-        mSize = resources.getDimensionPixelSize(R.dimen.add_size);
-        float barThickness = Math.round(resources.getDimension(R.dimen.add_thickness));
-
-        mPaint.setColor(color);
-        mPaint.setStyle(Paint.Style.STROKE);
-        mPaint.setStrokeJoin(Paint.Join.MITER);
-        mPaint.setStrokeCap(Paint.Cap.BUTT);
-        mPaint.setStrokeWidth(barThickness);
-
-        float halfSize = mSize / 2;
-        mPath.moveTo(0f, -halfSize);
-        mPath.lineTo(0, halfSize);
-        mPath.moveTo(-halfSize, 0);
-        mPath.lineTo(halfSize, 0);
+/**
+ * @param context used to get the configuration for the drawable from
+ */
+class AddDeleteDrawable(context: Context, color: Int) : Drawable() {
+    private val mPaint = Paint()
+    private val mPath = Path()
+    private val mSize: Int
+    private var mProgress = 0f
+    private var mAutoUpdateMirror = false
+    private var mVerticalMirror = false
+    init {
+        val resources = context.resources
+        mSize = resources.getDimensionPixelSize(R.dimen.add_size)
+        val barThickness = resources.getDimension(R.dimen.add_thickness).roundToInt().toFloat()
+        mPaint.color = color
+        mPaint.style = Paint.Style.STROKE
+        mPaint.strokeJoin = Paint.Join.MITER
+        mPaint.strokeCap = Paint.Cap.BUTT
+        mPaint.strokeWidth = barThickness
+        val halfSize = (mSize / 2).toFloat()
+        mPath.moveTo(0f, -halfSize)
+        mPath.lineTo(0f, halfSize)
+        mPath.moveTo(-halfSize, 0f)
+        mPath.lineTo(halfSize, 0f)
     }
 
-    @Override
-    public void draw(Canvas canvas) {
-        Rect bounds = getBounds();
-        float canvasRotate;
-        if (mVerticalMirror) {
-            canvasRotate = MathUtils.lerp(270, 135f, mProgress);
+    override fun draw(canvas: Canvas) {
+        val bounds = bounds
+        val canvasRotate = if (mVerticalMirror) {
+            MathUtils.lerp(270f, 135f, mProgress)
         } else {
-            canvasRotate = MathUtils.lerp(0f, 135f, mProgress);
+            MathUtils.lerp(0f, 135f, mProgress)
         }
-
-        canvas.save();
-        canvas.translate(bounds.centerX(), bounds.centerY());
-        canvas.rotate(canvasRotate);
-        canvas.drawPath(mPath, mPaint);
-        canvas.restore();
+        canvas.save()
+        canvas.translate(bounds.centerX().toFloat(), bounds.centerY().toFloat())
+        canvas.rotate(canvasRotate)
+        canvas.drawPath(mPath, mPaint)
+        canvas.restore()
     }
 
-    public void setColor(int color) {
-        mPaint.setColor(color);
-        invalidateSelf();
+    fun setColor(color: Int) {
+        mPaint.color = color
+        invalidateSelf()
     }
 
-    @Override
-    public void setAlpha(int alpha) {
-        mPaint.setAlpha(alpha);
+    override fun setAlpha(alpha: Int) {
+        mPaint.alpha = alpha
     }
 
-    @Override
-    public void setColorFilter(ColorFilter cf) {
-        mPaint.setColorFilter(cf);
+    override fun setColorFilter(cf: ColorFilter?) {
+        mPaint.setColorFilter(cf)
     }
 
-    @Override
-    public int getIntrinsicHeight() {
-        return mSize * 6 / 5;
+    override fun getIntrinsicHeight(): Int {
+        return mSize * 6 / 5
     }
 
-    @Override
-    public int getIntrinsicWidth() {
-        return mSize * 6 / 5;
+    override fun getIntrinsicWidth(): Int {
+        return mSize * 6 / 5
     }
 
     /**
      * If set, canvas is flipped when progress reached to end and going back to start.
      */
-    protected void setVerticalMirror(boolean verticalMirror) {
-        mVerticalMirror = verticalMirror;
+    private fun setVerticalMirror(verticalMirror: Boolean) {
+        mVerticalMirror = verticalMirror
     }
 
-    public void setAutoUpdateMirror(boolean autoUpdateMirror) {
-        mAutoUpdateMirror = autoUpdateMirror;
+    fun setAutoUpdateMirror(autoUpdateMirror: Boolean) {
+        mAutoUpdateMirror = autoUpdateMirror
     }
 
-    @Keep
-    public float getProgress() {
-        return mProgress;
-    }
-
-    @Keep
-    public void setProgress(float progress) {
-        if (mAutoUpdateMirror) {
-            if (progress == 1f) {
-                setVerticalMirror(true);
-            } else if (progress == 0f) {
-                setVerticalMirror(false);
+    @get:Keep
+    @set:Keep
+    var progress: Float
+        get() = mProgress
+        set(progress) {
+            if (mAutoUpdateMirror) {
+                if (progress == 1f) {
+                    setVerticalMirror(true)
+                } else if (progress == 0f) {
+                    setVerticalMirror(false)
+                }
             }
+            mProgress = progress
+            invalidateSelf()
         }
-        mProgress = progress;
-        invalidateSelf();
+
+    fun setAdd(duration: Long) {
+        setShape(false, duration)
     }
 
-    public void setAdd(long duration) {
-        setShape(false, duration);
+    fun setDelete(duration: Long) {
+        setShape(true, duration)
     }
 
-    public void setDelete(long duration) {
-        setShape(true, duration);
-    }
-
-    public void setShape(boolean delete, long duration) {
-        if (!((!delete && mProgress == 0f) || (delete && mProgress == 1f))) {
-            float endProgress = delete ? 1f : 0f;
+    fun setShape(delete: Boolean, duration: Long) {
+        if (!(!delete && mProgress == 0f || delete && mProgress == 1f)) {
+            val endProgress = if (delete) 1f else 0f
             if (duration <= 0) {
-                setProgress(endProgress);
+                progress = endProgress
             } else {
-                ObjectAnimator oa = ObjectAnimator.ofFloat(this, "progress", endProgress);
-                oa.setDuration(duration);
-                oa.setAutoCancel(true);
-                oa.start();
+                val oa = ObjectAnimator.ofFloat(this, "progress", endProgress)
+                oa.setDuration(duration)
+                oa.setAutoCancel(true)
+                oa.start()
             }
         }
     }
 
-    @Override
-    public int getOpacity() {
-        return PixelFormat.TRANSLUCENT;
+    @Deprecated(
+        "Deprecated in Java",
+        ReplaceWith("PixelFormat.TRANSLUCENT", "android.graphics.PixelFormat"),
+    )
+    override fun getOpacity(): Int {
+        return PixelFormat.TRANSLUCENT
     }
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/HandlerDrawable.kt b/app/src/main/java/com/hippo/ehviewer/ui/legacy/HandlerDrawable.kt
index 658131c33..8f0f39c05 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/legacy/HandlerDrawable.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/legacy/HandlerDrawable.kt
@@ -13,74 +13,68 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package com.hippo.ehviewer.ui.legacy
 
-package com.hippo.ehviewer.ui.legacy;
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.ColorFilter
+import android.graphics.Paint
+import android.graphics.PixelFormat
+import android.graphics.RectF
+import android.graphics.drawable.Drawable
 
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.ColorFilter;
-import android.graphics.Paint;
-import android.graphics.PixelFormat;
-import android.graphics.RectF;
-import android.graphics.drawable.Drawable;
+class HandlerDrawable : Drawable() {
+    private val mPaint = Paint(Paint.ANTI_ALIAS_FLAG)
+    private val mTemp = RectF()
+    private var mColor = Color.BLACK
 
-import androidx.annotation.NonNull;
-
-public class HandlerDrawable extends Drawable {
-
-    private final Paint mPaint;
-    private final RectF mTemp = new RectF();
-    private int mColor = Color.BLACK;
-
-    public HandlerDrawable() {
-        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-        mPaint.setColor(mColor);
-        mPaint.setStyle(Paint.Style.FILL);
+    init {
+        mPaint.color = mColor
+        mPaint.style = Paint.Style.FILL
     }
 
-    @Override
-    public void draw(@NonNull Canvas canvas) {
-        int width = getBounds().width();
-        int height = getBounds().height();
-
+    override fun draw(canvas: Canvas) {
+        val width = bounds.width()
+        val height = bounds.height()
         if (width > height) {
-            canvas.drawRect(0, 0, width, height, mPaint);
+            canvas.drawRect(0f, 0f, width.toFloat(), height.toFloat(), mPaint)
         } else {
-            mTemp.set(0, 0, width, width);
-            canvas.drawArc(mTemp, -180, 180, true, mPaint);
-            mTemp.set(0, height - width, width, height);
-            canvas.drawArc(mTemp, 0, 180, true, mPaint);
-            float halfWidth = (float) width / 2.0f;
-            canvas.drawRect(0, halfWidth, width, height - halfWidth, mPaint);
+            mTemp[0f, 0f, width.toFloat()] = width.toFloat()
+            canvas.drawArc(mTemp, -180f, 180f, true, mPaint)
+            mTemp[0f, (height - width).toFloat(), width.toFloat()] = height.toFloat()
+            canvas.drawArc(mTemp, 0f, 180f, true, mPaint)
+            val halfWidth = width.toFloat() / 2.0f
+            canvas.drawRect(0f, halfWidth, width.toFloat(), height - halfWidth, mPaint)
         }
     }
 
-    public void setColor(int color) {
+    fun setColor(color: Int) {
         if (mColor != color) {
-            mColor = color;
-            mPaint.setColor(color);
+            mColor = color
+            mPaint.color = color
         }
     }
 
-    @Override
-    public void setAlpha(int alpha) {
-        mPaint.setAlpha(alpha);
+    override fun setAlpha(alpha: Int) {
+        mPaint.alpha = alpha
     }
 
-    @Override
-    public void setColorFilter(ColorFilter colorFilter) {
-        mPaint.setColorFilter(colorFilter);
+    override fun setColorFilter(colorFilter: ColorFilter?) {
+        mPaint.setColorFilter(colorFilter)
     }
 
-    @Override
-    public int getOpacity() {
-        int alpha = Color.alpha(mColor);
-        if (alpha == 0xff) {
-            return PixelFormat.OPAQUE;
-        } else if (alpha == 0x00) {
-            return PixelFormat.TRANSPARENT;
-        } else {
-            return PixelFormat.TRANSLUCENT;
+    @Deprecated("Deprecated in Java")
+    override fun getOpacity(): Int {
+        return when (Color.alpha(mColor)) {
+            0xff -> {
+                PixelFormat.OPAQUE
+            }
+            0x00 -> {
+                PixelFormat.TRANSPARENT
+            }
+            else -> {
+                PixelFormat.TRANSLUCENT
+            }
         }
     }
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/UnikeryDrawable.kt b/app/src/main/java/com/hippo/ehviewer/ui/legacy/UnikeryDrawable.kt
index ad7770858..d0df43f51 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/legacy/UnikeryDrawable.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/legacy/UnikeryDrawable.kt
@@ -51,21 +51,23 @@ class UnikeryDrawable(private val mTextView: ObservedTextView, url: String) :
         drawable = null
     }
 
-    override fun setDrawable(drawable: Drawable?) {
-        // Remove old callback
-        val oldDrawable = getDrawable()
-        if (oldDrawable != null) {
-            oldDrawable.callback = null
+    override var drawable: Drawable?
+        get() = super.drawable
+        set(drawable) {
+            // Remove old callback
+            val oldDrawable = drawable
+            if (oldDrawable != null) {
+                oldDrawable.callback = null
+            }
+            super.drawable = drawable
+            if (drawable != null) {
+                drawable.callback = mTextView
+            }
+            updateBounds()
+            if (drawable != null) {
+                invalidateSelf()
+            }
         }
-        super.setDrawable(drawable)
-        if (drawable != null) {
-            drawable.callback = mTextView
-        }
-        updateBounds()
-        if (drawable != null) {
-            invalidateSelf()
-        }
-    }
 
     override fun invalidateSelf() {
         val cs = mTextView.text
@@ -74,7 +76,7 @@ class UnikeryDrawable(private val mTextView: ObservedTextView, url: String) :
 
     private fun onGetValue(drawable: Drawable) {
         clearDrawable()
-        setDrawable(drawable)
+        this.drawable = drawable
         if (drawable is AnimatedImageDrawable) {
             drawable.start()
         }
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/legacy/WrapDrawable.kt b/app/src/main/java/com/hippo/ehviewer/ui/legacy/WrapDrawable.kt
index 412415bd1..5d5217e12 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/legacy/WrapDrawable.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/legacy/WrapDrawable.kt
@@ -13,131 +13,107 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package com.hippo.ehviewer.ui.legacy
 
-package com.hippo.ehviewer.ui.legacy;
+import android.graphics.Canvas
+import android.graphics.ColorFilter
+import android.graphics.PixelFormat
+import android.graphics.Rect
+import android.graphics.drawable.Drawable
 
-import android.graphics.Canvas;
-import android.graphics.ColorFilter;
-import android.graphics.PixelFormat;
-import android.graphics.Rect;
-import android.graphics.drawable.Drawable;
-
-public class WrapDrawable extends Drawable {
-
-    private Drawable mDrawable;
-
-    public Drawable getDrawable() {
-        return mDrawable;
+open class WrapDrawable : Drawable() {
+    open var drawable: Drawable? = null
+    fun updateBounds() {
+        setBounds(0, 0, intrinsicWidth, intrinsicHeight)
     }
 
-    public void setDrawable(Drawable drawable) {
-        mDrawable = drawable;
-    }
-
-    public void updateBounds() {
-        setBounds(0, 0, getIntrinsicWidth(), getIntrinsicHeight());
-    }
-
-    @Override
-    public void draw(Canvas canvas) {
-        if (mDrawable != null) {
-            mDrawable.draw(canvas);
+    override fun draw(canvas: Canvas) {
+        if (drawable != null) {
+            drawable!!.draw(canvas)
         }
     }
 
-    @Override
-    public void setBounds(int left, int top, int right, int bottom) {
-        super.setBounds(left, top, right, bottom);
-
-        if (mDrawable != null) {
-            mDrawable.setBounds(left, top, right, bottom);
+    override fun setBounds(left: Int, top: Int, right: Int, bottom: Int) {
+        super.setBounds(left, top, right, bottom)
+        if (drawable != null) {
+            drawable!!.setBounds(left, top, right, bottom)
         }
     }
 
-    @Override
-    public void setBounds(Rect bounds) {
-        super.setBounds(bounds);
-
-        if (mDrawable != null) {
-            mDrawable.setBounds(bounds);
+    override fun setBounds(bounds: Rect) {
+        super.setBounds(bounds)
+        if (drawable != null) {
+            drawable!!.bounds = bounds
         }
     }
 
-    @Override
-    public int getChangingConfigurations() {
-        if (mDrawable != null) {
-            return mDrawable.getChangingConfigurations();
+    override fun getChangingConfigurations(): Int {
+        return if (drawable != null) {
+            drawable!!.changingConfigurations
         } else {
-            return super.getChangingConfigurations();
+            super.getChangingConfigurations()
         }
     }
 
-    @Override
-    public void setChangingConfigurations(int configs) {
-        super.setChangingConfigurations(configs);
-
-        if (mDrawable != null) {
-            mDrawable.setChangingConfigurations(configs);
+    override fun setChangingConfigurations(configs: Int) {
+        super.setChangingConfigurations(configs)
+        if (drawable != null) {
+            drawable!!.changingConfigurations = configs
         }
     }
 
-    @Override
-    public void setDither(boolean dither) {
-        super.setDither(dither);
-
-        if (mDrawable != null) {
-            mDrawable.setDither(dither);
+    @Deprecated("Deprecated in Java")
+    override fun setDither(dither: Boolean) {
+        super.setDither(dither)
+        if (drawable != null) {
+            drawable!!.setDither(dither)
         }
     }
 
-    @Override
-    public void setFilterBitmap(boolean filter) {
-        super.setFilterBitmap(filter);
-
-        if (mDrawable != null) {
-            mDrawable.setFilterBitmap(filter);
+    override fun setFilterBitmap(filter: Boolean) {
+        super.setFilterBitmap(filter)
+        if (drawable != null) {
+            drawable!!.isFilterBitmap = filter
         }
     }
 
-
-    @Override
-    public void setAlpha(int alpha) {
-        if (mDrawable != null) {
-            mDrawable.setAlpha(alpha);
+    override fun setAlpha(alpha: Int) {
+        if (drawable != null) {
+            drawable!!.alpha = alpha
         }
     }
 
-    @Override
-    public void setColorFilter(ColorFilter cf) {
-        if (mDrawable != null) {
-            mDrawable.setColorFilter(cf);
+    override fun setColorFilter(cf: ColorFilter?) {
+        if (drawable != null) {
+            drawable!!.colorFilter = cf
         }
     }
 
-    @Override
-    public int getOpacity() {
-        if (mDrawable != null) {
-            return mDrawable.getOpacity();
+    @Deprecated(
+        "Deprecated in Java",
+        ReplaceWith("PixelFormat.TRANSLUCENT", "android.graphics.PixelFormat"),
+    )
+    override fun getOpacity(): Int {
+        return if (drawable != null) {
+            drawable!!.opacity
         } else {
-            return PixelFormat.UNKNOWN;
+            PixelFormat.UNKNOWN
         }
     }
 
-    @Override
-    public int getIntrinsicWidth() {
-        if (mDrawable != null) {
-            return mDrawable.getIntrinsicWidth();
+    override fun getIntrinsicWidth(): Int {
+        return if (drawable != null) {
+            drawable!!.intrinsicWidth
         } else {
-            return super.getIntrinsicWidth();
+            super.getIntrinsicWidth()
         }
     }
 
-    @Override
-    public int getIntrinsicHeight() {
-        if (mDrawable != null) {
-            return mDrawable.getIntrinsicHeight();
+    override fun getIntrinsicHeight(): Int {
+        return if (drawable != null) {
+            drawable!!.intrinsicHeight
         } else {
-            return super.getIntrinsicHeight();
+            super.getIntrinsicHeight()
         }
     }
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.kt b/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.kt
index 116564d36..d84afed03 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryListScene.kt
@@ -394,8 +394,7 @@ class GalleryListScene : SearchBarScene(), OnDragHandlerListener, SearchLayout.H
         binding.fabLayout.addOnExpandListener(this)
         addAboveSnackView(binding.fabLayout)
         val colorID = theme.resolveColor(com.google.android.material.R.attr.colorOnSurface)
-        mActionFabDrawable =
-            AddDeleteDrawable(context, colorID)
+        mActionFabDrawable = AddDeleteDrawable(requireContext(), colorID)
         binding.fabLayout.primaryFab!!.setImageDrawable(mActionFabDrawable)
         mSearchFab.setOnClickListener { onApplySearch() }