优化

app/src/main/java/io/legado/app/ui/main/BookSourceFragment.kt

@@ -0,0 +1,7 @@
+package io.legado.app.ui.main
+
+import androidx.fragment.app.Fragment
+
+class BookSourceFragment : Fragment() {
+
+}

app/src/main/java/io/legado/app/ui/main/BookshelfFragment.kt

@@ -0,0 +1,7 @@
+package io.legado.app.ui.main
+
+import androidx.fragment.app.Fragment
+
+class BookshelfFragment : Fragment() {
+
+}

app/src/main/java/io/legado/app/ui/main/FindBookFragment.kt

@@ -0,0 +1,7 @@
+package io.legado.app.ui.main
+
+import androidx.fragment.app.Fragment
+
+class FindBookFragment : Fragment() {
+
+}

app/src/main/java/io/legado/app/ui/main/MyFragment.kt

@@ -0,0 +1,7 @@
+package io.legado.app.ui.main
+
+import androidx.fragment.app.Fragment
+
+class MyFragment : Fragment() {
+
+}

app/src/main/res/layout/nav_header_main.xml

@@ -1,37 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:app="http://schemas.android.com/apk/res-auto"
-        android:layout_width="match_parent"
-        android:layout_height="@dimen/nav_header_height"
-        android:background="@drawable/side_nav_bar"
-        android:paddingBottom="@dimen/activity_vertical_margin"
-        android:paddingLeft="@dimen/activity_horizontal_margin"
-        android:paddingRight="@dimen/activity_horizontal_margin"
-        android:paddingTop="@dimen/activity_vertical_margin"
-        android:theme="@style/ThemeOverlay.AppCompat.Dark"
-        android:orientation="vertical"
-        android:gravity="bottom">
-
-    <ImageView
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:paddingTop="@dimen/nav_header_vertical_spacing"
-            app:srcCompat="@mipmap/ic_launcher_round"
-            android:contentDescription="@string/nav_header_desc"
-            android:id="@+id/imageView"/>
-
-    <TextView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:paddingTop="@dimen/nav_header_vertical_spacing"
-            android:text="@string/nav_header_title"
-            android:textAppearance="@style/TextAppearance.AppCompat.Body1"/>
-
-    <TextView
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="@string/nav_header_subtitle"
-            android:id="@+id/textView"/>
-
-</LinearLayout>