add e-ink mode

app/src/main/java/io/legado/app/utils/ContextExtensions.kt

@@ -129,5 +129,8 @@ fun Context.shareWithQr(title: String, text: String) {
 val Context.isNightTheme: Boolean
     get() = getPrefBoolean("isNightTheme")
 
+val Context.isEInkMode: Boolean
+    get() = getPrefBoolean("isEInkMode")
+
 val Context.isTransparentStatusBar: Boolean
     get() = getPrefBoolean("transparentStatusBar", true)

app/src/main/res/values/strings.xml

@@ -447,6 +447,7 @@
     <string name="switch_display_style">切换显示样式</string>
     <string name="import_per">导入本地书籍需存储权限</string>
     <string name="night_theme">夜间模式</string>
+    <string name="eink_theme">E-Ink 模式</string>
     <string name="get_storage_per">本软件需要存储权限来存储备份书籍信息</string>
     <string name="double_click_exit">再按一次退出程序</string>
     <string name="import_book_per">导入本地书籍需存储权限</string>

app/src/main/res/xml/pref_main.xml

@@ -18,6 +18,12 @@
         android:title="@string/night_theme"
         app:iconSpaceReserved="false" />
 
+    <io.legado.app.lib.theme.prefs.ATESwitchPreference
+        android:defaultValue="false"
+        android:key="isEInkMode"
+        android:title="@string/eink_theme"
+        app:iconSpaceReserved="false" />
+
     <io.legado.app.lib.theme.prefs.ATESwitchPreference
         android:defaultValue="false"
         android:key="webService"