diff --git a/app/src/main/java/io/legado/app/ui/widget/ArcView.java b/app/src/main/java/io/legado/app/ui/widget/ArcView.java
deleted file mode 100644
index 8e6e849ae..000000000
--- a/app/src/main/java/io/legado/app/ui/widget/ArcView.java
+++ /dev/null
@@ -1,93 +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.Path;
-import android.graphics.Rect;
-import android.util.AttributeSet;
-import android.view.View;
-import io.legado.app.R;
-import androidx.annotation.Nullable;
-
-public class ArcView extends View {
-    private int mWidth;
-    private int mHeight;
-    /**
-     * 弧形高度
-     */
-    private int mArcHeight;
-    /**
-     * 背景颜色
-     */
-    private int mBgColor;
-    private Paint mPaint;
-    private boolean mDirectionTop;
-    private Context mContext;
-
-    public ArcView(Context context) {
-        this(context, null);
-    }
-
-    public ArcView(Context context, @Nullable AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public ArcView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-
-        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ArcView);
-        mArcHeight = typedArray.getDimensionPixelSize(R.styleable.ArcView_arcHeight, 0);
-        mBgColor = typedArray.getColor(R.styleable.ArcView_bgColor, Color.parseColor("#303F9F"));
-        mDirectionTop = typedArray.getBoolean(R.styleable.ArcView_arcDirectionTop, false);
-        mContext = context;
-        mPaint = new Paint();
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        super.onDraw(canvas);
-
-        mPaint.setStyle(Paint.Style.FILL);
-        mPaint.setColor(mBgColor);
-
-        if (mDirectionTop) {
-            Rect rect = new Rect(0, mArcHeight, mWidth, mHeight);
-            canvas.drawRect(rect, mPaint);
-
-
-            Path path = new Path();
-            path.moveTo(0, mArcHeight);
-            path.quadTo(mWidth / 2, 0, mWidth,  mArcHeight);
-            canvas.drawPath(path, mPaint);
-        } else {
-            Rect rect = new Rect(0, 0, mWidth, mHeight - mArcHeight);
-            canvas.drawRect(rect, mPaint);
-
-
-            Path path = new Path();
-            path.moveTo(0, mHeight - mArcHeight);
-            path.quadTo(mWidth / 2, mHeight, mWidth, mHeight - mArcHeight);
-            canvas.drawPath(path, mPaint);
-        }
-    }
-
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
-        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
-        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
-        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
-
-        if (widthMode == MeasureSpec.EXACTLY) {
-            mWidth = widthSize;
-        }
-        if (heightMode == MeasureSpec.EXACTLY) {
-            mHeight = heightSize;
-        }
-        setMeasuredDimension(mWidth, mHeight);
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/widget/ArcView.kt b/app/src/main/java/io/legado/app/ui/widget/ArcView.kt
new file mode 100644
index 000000000..a6e8eaa1f
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/widget/ArcView.kt
@@ -0,0 +1,82 @@
+package io.legado.app.ui.widget
+
+import android.content.Context
+import android.graphics.*
+import android.util.AttributeSet
+import android.view.View
+import io.legado.app.R
+
+class ArcView @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+    private var mWidth = 0
+    private var mHeight = 0
+
+    /**
+     * 弧形高度
+     */
+    private val mArcHeight: Int
+
+    /**
+     * 背景颜色
+     */
+    private val mBgColor: Int
+    private val mPaint: Paint = Paint()
+    private val mDirectionTop: Boolean
+    val rect = Rect()
+    val path = Path()
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        mPaint.style = Paint.Style.FILL
+        mPaint.color = mBgColor
+        if (mDirectionTop) {
+            rect.set(0, mArcHeight, mWidth, mHeight)
+            canvas.drawRect(rect, mPaint)
+            path.reset()
+            path.moveTo(0f, mArcHeight.toFloat())
+            path.quadTo(mWidth / 2.toFloat(), 0f, mWidth.toFloat(), mArcHeight.toFloat())
+            canvas.drawPath(path, mPaint)
+        } else {
+            rect.set(0, 0, mWidth, mHeight - mArcHeight)
+            canvas.drawRect(rect, mPaint)
+            path.reset()
+            path.moveTo(0f, mHeight - mArcHeight.toFloat())
+            path.quadTo(
+                mWidth / 2.toFloat(),
+                mHeight.toFloat(),
+                mWidth.toFloat(),
+                mHeight - mArcHeight.toFloat()
+            )
+            canvas.drawPath(path, mPaint)
+        }
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        val widthSize = MeasureSpec.getSize(widthMeasureSpec)
+        val widthMode = MeasureSpec.getMode(widthMeasureSpec)
+        val heightSize = MeasureSpec.getSize(heightMeasureSpec)
+        val heightMode = MeasureSpec.getMode(heightMeasureSpec)
+        if (widthMode == MeasureSpec.EXACTLY) {
+            mWidth = widthSize
+        }
+        if (heightMode == MeasureSpec.EXACTLY) {
+            mHeight = heightSize
+        }
+        setMeasuredDimension(mWidth, mHeight)
+    }
+
+    init {
+        val typedArray = context.obtainStyledAttributes(attrs, R.styleable.ArcView)
+        mArcHeight = typedArray.getDimensionPixelSize(R.styleable.ArcView_arcHeight, 0)
+        mBgColor = typedArray.getColor(
+            R.styleable.ArcView_bgColor,
+            Color.parseColor("#303F9F")
+        )
+        mDirectionTop = typedArray.getBoolean(R.styleable.ArcView_arcDirectionTop, false)
+        typedArray.recycle()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/widget/ScrollTextView.kt b/app/src/main/java/io/legado/app/ui/widget/text/ScrollTextView.kt
similarity index 98%
rename from app/src/main/java/io/legado/app/ui/widget/ScrollTextView.kt
rename to app/src/main/java/io/legado/app/ui/widget/text/ScrollTextView.kt
index 29f1a9fb8..d0b579cd4 100644
--- a/app/src/main/java/io/legado/app/ui/widget/ScrollTextView.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/text/ScrollTextView.kt
@@ -1,4 +1,4 @@
-package io.legado.app.ui.widget
+package io.legado.app.ui.widget.text
 
 import android.annotation.SuppressLint
 import android.content.Context
diff --git a/app/src/main/res/layout/activity_book_info.xml b/app/src/main/res/layout/activity_book_info.xml
index 96ea949e6..8e58e34cb 100644
--- a/app/src/main/res/layout/activity_book_info.xml
+++ b/app/src/main/res/layout/activity_book_info.xml
@@ -243,7 +243,7 @@
 
                 </LinearLayout>
 
-                <io.legado.app.ui.widget.ScrollTextView
+                <io.legado.app.ui.widget.text.ScrollTextView
                     android:id="@+id/tv_intro"
                     android:layout_marginTop="8dp"
                     android:layout_width="match_parent"