diff --git a/app/src/main/java/io/legado/app/ui/widget/SearchView.java b/app/src/main/java/io/legado/app/ui/widget/SearchView.java
deleted file mode 100644
index 3ee0bd69b..000000000
--- a/app/src/main/java/io/legado/app/ui/widget/SearchView.java
+++ /dev/null
@@ -1,119 +0,0 @@
-package io.legado.app.ui.widget;
-
-import android.app.SearchableInfo;
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Paint;
-import android.graphics.drawable.Drawable;
-import android.text.Spannable;
-import android.text.SpannableStringBuilder;
-import android.text.style.ImageSpan;
-import android.util.AttributeSet;
-import android.util.TypedValue;
-import android.view.Gravity;
-import android.widget.TextView;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import io.legado.app.R;
-
-public class SearchView extends androidx.appcompat.widget.SearchView {
-    private Drawable mSearchHintIcon = null;
-    private TextView textView = null;
-
-    public SearchView(Context context) {
-        this(context, null);
-    }
-
-    public SearchView(Context context, AttributeSet attrs) {
-        super(context, attrs);
-    }
-
-    public SearchView(Context context, AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-    }
-
-    @Override
-    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
-        super.onLayout(changed, left, top, right, bottom);
-        try {
-            if (textView == null) {
-                textView = (TextView) this.findViewById(androidx.appcompat.R.id.search_src_text);
-                mSearchHintIcon = this.getContext().getDrawable(R.drawable.ic_search_hint);
-                updateQueryHint();
-            }
-            // 改变字体
-            textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
-            textView.setGravity(Gravity.CENTER_VERTICAL);
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-
-
-    private CharSequence getDecoratedHint(CharSequence hintText) {
-        // If the field is always expanded or we don't have a search hint icon,
-        // then don't add the search icon to the hint.
-        if (mSearchHintIcon == null) {
-            return hintText;
-        }
-
-        final int textSize = (int) (textView.getTextSize() * 0.8);
-        mSearchHintIcon.setBounds(0, 0, textSize, textSize);
-
-        final SpannableStringBuilder ssb = new SpannableStringBuilder("   ");
-        ssb.setSpan(new CenteredImageSpan(mSearchHintIcon), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
-        ssb.append(hintText);
-        return ssb;
-    }
-
-    private void updateQueryHint() {
-        if (textView != null) {
-            final CharSequence hint = getQueryHint();
-            textView.setHint(getDecoratedHint(hint == null ? "" : hint));
-        }
-    }
-
-    @Override
-    public void setIconifiedByDefault(boolean iconified) {
-        super.setIconifiedByDefault(iconified);
-        updateQueryHint();
-    }
-
-    @Override
-    public void setSearchableInfo(SearchableInfo searchable) {
-        super.setSearchableInfo(searchable);
-        if (searchable != null)
-            updateQueryHint();
-    }
-
-    @Override
-    public void setQueryHint(@Nullable CharSequence hint) {
-        super.setQueryHint(hint);
-        updateQueryHint();
-    }
-}
-
-class CenteredImageSpan extends ImageSpan {
-
-    public CenteredImageSpan(final Drawable drawable) {
-        super(drawable);
-    }
-
-    @Override
-    public void draw(@NonNull Canvas canvas, CharSequence text,
-                     int start, int end, float x,
-                     int top, int y, int bottom, @NonNull Paint paint) {
-        // image to draw
-        Drawable b = getDrawable();
-        // font metrics of text to be replaced
-        Paint.FontMetricsInt fm = paint.getFontMetricsInt();
-        int transY = (y + fm.descent + y + fm.ascent) / 2
-                - b.getBounds().bottom / 2;
-
-        canvas.save();
-        canvas.translate(x, transY);
-        b.draw(canvas);
-        canvas.restore();
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/widget/SearchView.kt b/app/src/main/java/io/legado/app/ui/widget/SearchView.kt
new file mode 100644
index 000000000..a1d8bd5f6
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/widget/SearchView.kt
@@ -0,0 +1,113 @@
+package io.legado.app.ui.widget
+
+import android.app.SearchableInfo
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Paint
+import android.graphics.drawable.Drawable
+import android.text.Spannable
+import android.text.SpannableStringBuilder
+import android.text.style.ImageSpan
+import android.util.AttributeSet
+import android.util.TypedValue
+import android.view.Gravity
+import android.view.View
+import android.widget.TextView
+import androidx.appcompat.widget.SearchView
+import io.legado.app.R
+
+class SearchView : SearchView {
+    private var mSearchHintIcon: Drawable? = null
+    private var textView: TextView? = null
+
+    constructor(
+        context: Context?,
+        attrs: AttributeSet? = null
+    ) : super(context, attrs)
+
+    constructor(
+        context: Context?,
+        attrs: AttributeSet?,
+        defStyleAttr: Int
+    ) : super(context, attrs, defStyleAttr)
+
+    override fun onLayout(
+        changed: Boolean,
+        left: Int,
+        top: Int,
+        right: Int,
+        bottom: Int
+    ) {
+        super.onLayout(changed, left, top, right, bottom)
+        try {
+            if (textView == null) {
+                textView =
+                    findViewById<View>(androidx.appcompat.R.id.search_src_text) as TextView
+                mSearchHintIcon = this.context.getDrawable(R.drawable.ic_search_hint)
+                updateQueryHint()
+            }
+            // 改变字体
+            textView!!.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14f)
+            textView!!.gravity = Gravity.CENTER_VERTICAL
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+    private fun getDecoratedHint(hintText: CharSequence): CharSequence {
+        // If the field is always expanded or we don't have a search hint icon,
+        // then don't add the search icon to the hint.
+        if (mSearchHintIcon == null) {
+            return hintText
+        }
+        val textSize = (textView!!.textSize * 0.8).toInt()
+        mSearchHintIcon!!.setBounds(0, 0, textSize, textSize)
+        val ssb = SpannableStringBuilder("   ")
+        ssb.setSpan(CenteredImageSpan(mSearchHintIcon), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+        ssb.append(hintText)
+        return ssb
+    }
+
+    private fun updateQueryHint() {
+        if (textView != null) {
+            val hint = queryHint
+            textView!!.hint = getDecoratedHint(hint ?: "")
+        }
+    }
+
+    override fun setIconifiedByDefault(iconified: Boolean) {
+        super.setIconifiedByDefault(iconified)
+        updateQueryHint()
+    }
+
+    override fun setSearchableInfo(searchable: SearchableInfo?) {
+        super.setSearchableInfo(searchable)
+        searchable?.let {
+            updateQueryHint()
+        }
+    }
+
+    override fun setQueryHint(hint: CharSequence?) {
+        super.setQueryHint(hint)
+        updateQueryHint()
+    }
+}
+
+internal class CenteredImageSpan(drawable: Drawable?) : ImageSpan(drawable!!) {
+    override fun draw(
+        canvas: Canvas, text: CharSequence,
+        start: Int, end: Int, x: Float,
+        top: Int, y: Int, bottom: Int, paint: Paint
+    ) {
+        // image to draw
+        val b = drawable
+        // font metrics of text to be replaced
+        val fm = paint.fontMetricsInt
+        val transY = ((y + fm.descent + y + fm.ascent) / 2
+                - b.bounds.bottom / 2)
+        canvas.save()
+        canvas.translate(x, transY.toFloat())
+        b.draw(canvas)
+        canvas.restore()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.java b/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.java
deleted file mode 100644
index 4ef6ffd2e..000000000
--- a/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.java
+++ /dev/null
@@ -1,195 +0,0 @@
-package io.legado.app.ui.widget;
-
-import android.content.Context;
-import android.content.res.TypedArray;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.RectF;
-import android.util.AttributeSet;
-import android.util.DisplayMetrics;
-import android.view.View;
-import android.widget.RelativeLayout;
-import io.legado.app.R;
-
-/**
- * ShadowLayout.java
- * <p>
- * Created by lijiankun on 17/8/11.
- */
-
-public class ShadowLayout extends RelativeLayout {
-
-    public static final int ALL = 0x1111;
-
-    public static final int LEFT = 0x0001;
-
-    public static final int TOP = 0x0010;
-
-    public static final int RIGHT = 0x0100;
-
-    public static final int BOTTOM = 0x1000;
-
-    public static final int SHAPE_RECTANGLE = 0x0001;
-
-    public static final int SHAPE_OVAL = 0x0010;
-
-    private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-
-    private RectF mRectF = new RectF();
-
-    /**
-     * 阴影的颜色
-     */
-    private int mShadowColor = Color.TRANSPARENT;
-
-    /**
-     * 阴影的大小范围
-     */
-    private float mShadowRadius = 0;
-
-    /**
-     * 阴影 x 轴的偏移量
-     */
-    private float mShadowDx = 0;
-
-    /**
-     * 阴影 y 轴的偏移量
-     */
-    private float mShadowDy = 0;
-
-    /**
-     * 阴影显示的边界
-     */
-    private int mShadowSide = ALL;
-
-    /**
-     * 阴影的形状，圆形/矩形
-     */
-    private int mShadowShape = SHAPE_RECTANGLE;
-
-    public ShadowLayout(Context context) {
-        this(context, null);
-    }
-
-    public ShadowLayout(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public ShadowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-        init(attrs);
-    }
-
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        float effect = mShadowRadius + dip2px(5);
-        float rectLeft = 0;
-        float rectTop = 0;
-        float rectRight = this.getMeasuredWidth();
-        float rectBottom = this.getMeasuredHeight();
-        int paddingLeft = 0;
-        int paddingTop = 0;
-        int paddingRight = 0;
-        int paddingBottom = 0;
-        this.getWidth();
-        if ((mShadowSide & LEFT) == LEFT) {
-            rectLeft = effect;
-            paddingLeft = (int) effect;
-        }
-        if ((mShadowSide & TOP) == TOP) {
-            rectTop = effect;
-            paddingTop = (int) effect;
-        }
-        if ((mShadowSide & RIGHT) == RIGHT) {
-            rectRight = this.getMeasuredWidth() - effect;
-            paddingRight = (int) effect;
-        }
-        if ((mShadowSide & BOTTOM) == BOTTOM) {
-            rectBottom = this.getMeasuredHeight() - effect;
-            paddingBottom = (int) effect;
-        }
-        if (mShadowDy != 0.0f) {
-            rectBottom = rectBottom - mShadowDy;
-            paddingBottom = paddingBottom + (int) mShadowDy;
-        }
-        if (mShadowDx != 0.0f) {
-            rectRight = rectRight - mShadowDx;
-            paddingRight = paddingRight + (int) mShadowDx;
-        }
-        mRectF.left = rectLeft;
-        mRectF.top = rectTop;
-        mRectF.right = rectRight;
-        mRectF.bottom = rectBottom;
-        this.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
-    }
-
-    /**
-     * 真正绘制阴影的方法
-     */
-    @Override
-    protected void onDraw(Canvas canvas) {
-        super.onDraw(canvas);
-        setUpShadowPaint();
-        if (mShadowShape == SHAPE_RECTANGLE) {
-            canvas.drawRect(mRectF, mPaint);
-        } else if (mShadowShape == SHAPE_OVAL) {
-            canvas.drawCircle(mRectF.centerX(), mRectF.centerY(), Math.min(mRectF.width(), mRectF.height()) / 2, mPaint);
-        }
-    }
-
-    public void setShadowColor(int shadowColor) {
-        mShadowColor = shadowColor;
-        requestLayout();
-        postInvalidate();
-    }
-
-    public void setShadowRadius(float shadowRadius) {
-        mShadowRadius = shadowRadius;
-        requestLayout();
-        postInvalidate();
-    }
-
-    /**
-     * 读取设置的阴影的属性
-     *
-     * @param attrs 从其中获取设置的值
-     */
-    private void init(AttributeSet attrs) {
-        setLayerType(View.LAYER_TYPE_SOFTWARE, null);  // 关闭硬件加速
-        this.setWillNotDraw(false);                    // 调用此方法后，才会执行 onDraw(Canvas) 方法
-
-        TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.ShadowLayout);
-        if (typedArray != null) {
-            mShadowColor = typedArray.getColor(R.styleable.ShadowLayout_shadowColor,
-                    getContext().getResources().getColor(android.R.color.black));
-            mShadowRadius = typedArray.getDimension(R.styleable.ShadowLayout_shadowRadius, dip2px(0));
-            mShadowDx = typedArray.getDimension(R.styleable.ShadowLayout_shadowDx, dip2px(0));
-            mShadowDy = typedArray.getDimension(R.styleable.ShadowLayout_shadowDy, dip2px(0));
-            mShadowSide = typedArray.getInt(R.styleable.ShadowLayout_shadowSide, ALL);
-            mShadowShape = typedArray.getInt(R.styleable.ShadowLayout_shadowShape, SHAPE_RECTANGLE);
-            typedArray.recycle();
-        }
-        setUpShadowPaint();
-    }
-
-    private void setUpShadowPaint() {
-        mPaint.reset();
-        mPaint.setAntiAlias(true);
-        mPaint.setColor(Color.TRANSPARENT);
-        mPaint.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
-    }
-
-    /**
-     * dip2px dp 值转 px 值
-     *
-     * @param dpValue dp 值
-     * @return px 值
-     */
-    private float dip2px(float dpValue) {
-        DisplayMetrics dm = getContext().getResources().getDisplayMetrics();
-        float scale = dm.density;
-        return (dpValue * scale + 0.5F);
-    }
-}
diff --git a/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt b/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt
new file mode 100644
index 000000000..0f6ad3200
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/widget/ShadowLayout.kt
@@ -0,0 +1,185 @@
+package io.legado.app.ui.widget
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.RectF
+import android.util.AttributeSet
+import android.view.View
+import android.widget.RelativeLayout
+import io.legado.app.R
+import io.legado.app.utils.getCompatColor
+
+/**
+ * ShadowLayout.java
+ *
+ *
+ * Created by lijiankun on 17/8/11.
+ */
+class ShadowLayout(
+    context: Context,
+    attrs: AttributeSet? = null
+) : RelativeLayout(context, attrs) {
+    private val mPaint =
+        Paint(Paint.ANTI_ALIAS_FLAG)
+    private val mRectF = RectF()
+
+    /**
+     * 阴影的颜色
+     */
+    private var mShadowColor = Color.TRANSPARENT
+
+    /**
+     * 阴影的大小范围
+     */
+    private var mShadowRadius = 0f
+
+    /**
+     * 阴影 x 轴的偏移量
+     */
+    private var mShadowDx = 0f
+
+    /**
+     * 阴影 y 轴的偏移量
+     */
+    private var mShadowDy = 0f
+
+    /**
+     * 阴影显示的边界
+     */
+    private var mShadowSide = ALL
+
+    /**
+     * 阴影的形状，圆形/矩形
+     */
+    private var mShadowShape = SHAPE_RECTANGLE
+
+
+    init {
+        setLayerType(View.LAYER_TYPE_SOFTWARE, null) // 关闭硬件加速
+        setWillNotDraw(false) // 调用此方法后，才会执行 onDraw(Canvas) 方法
+        val typedArray =
+            context.obtainStyledAttributes(attrs, R.styleable.ShadowLayout)
+        mShadowColor = typedArray.getColor(
+            R.styleable.ShadowLayout_shadowColor,
+            context.getCompatColor(android.R.color.black)
+        )
+        mShadowRadius =
+            typedArray.getDimension(R.styleable.ShadowLayout_shadowRadius, dip2px(0f))
+        mShadowDx = typedArray.getDimension(R.styleable.ShadowLayout_shadowDx, dip2px(0f))
+        mShadowDy = typedArray.getDimension(R.styleable.ShadowLayout_shadowDy, dip2px(0f))
+        mShadowSide =
+            typedArray.getInt(R.styleable.ShadowLayout_shadowSide, ALL)
+        mShadowShape = typedArray.getInt(
+            R.styleable.ShadowLayout_shadowShape,
+            SHAPE_RECTANGLE
+        )
+        typedArray.recycle()
+
+        setUpShadowPaint()
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        val effect = mShadowRadius + dip2px(5f)
+        var rectLeft = 0f
+        var rectTop = 0f
+        var rectRight = this.measuredWidth.toFloat()
+        var rectBottom = this.measuredHeight.toFloat()
+        var paddingLeft = 0
+        var paddingTop = 0
+        var paddingRight = 0
+        var paddingBottom = 0
+        this.width
+        if (mShadowSide and LEFT == LEFT) {
+            rectLeft = effect
+            paddingLeft = effect.toInt()
+        }
+        if (mShadowSide and TOP == TOP) {
+            rectTop = effect
+            paddingTop = effect.toInt()
+        }
+        if (mShadowSide and RIGHT == RIGHT) {
+            rectRight = this.measuredWidth - effect
+            paddingRight = effect.toInt()
+        }
+        if (mShadowSide and BOTTOM == BOTTOM) {
+            rectBottom = this.measuredHeight - effect
+            paddingBottom = effect.toInt()
+        }
+        if (mShadowDy != 0.0f) {
+            rectBottom -= mShadowDy
+            paddingBottom += mShadowDy.toInt()
+        }
+        if (mShadowDx != 0.0f) {
+            rectRight -= mShadowDx
+            paddingRight += mShadowDx.toInt()
+        }
+        mRectF.left = rectLeft
+        mRectF.top = rectTop
+        mRectF.right = rectRight
+        mRectF.bottom = rectBottom
+        setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom)
+    }
+
+    /**
+     * 真正绘制阴影的方法
+     */
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        setUpShadowPaint()
+        if (mShadowShape == SHAPE_RECTANGLE) {
+            canvas.drawRect(mRectF, mPaint)
+        } else if (mShadowShape == SHAPE_OVAL) {
+            canvas.drawCircle(
+                mRectF.centerX(),
+                mRectF.centerY(),
+                mRectF.width().coerceAtMost(mRectF.height()) / 2,
+                mPaint
+            )
+        }
+    }
+
+    fun setShadowColor(shadowColor: Int) {
+        mShadowColor = shadowColor
+        requestLayout()
+        postInvalidate()
+    }
+
+    fun setShadowRadius(shadowRadius: Float) {
+        mShadowRadius = shadowRadius
+        requestLayout()
+        postInvalidate()
+    }
+
+    private fun setUpShadowPaint() {
+        mPaint.reset()
+        mPaint.isAntiAlias = true
+        mPaint.color = Color.TRANSPARENT
+        mPaint.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor)
+    }
+
+    /**
+     * dip2px dp 值转 px 值
+     *
+     * @param dpValue dp 值
+     * @return px 值
+     */
+    private fun dip2px(dpValue: Float): Float {
+        val dm = context.resources.displayMetrics
+        val scale = dm.density
+        return dpValue * scale + 0.5f
+    }
+
+    companion object {
+        const val ALL = 0x1111
+        const val LEFT = 0x0001
+        const val TOP = 0x0010
+        const val RIGHT = 0x0100
+        const val BOTTOM = 0x1000
+        const val SHAPE_RECTANGLE = 0x0001
+        const val SHAPE_OVAL = 0x0010
+    }
+
+}
\ No newline at end of file