优化

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -314,13 +314,13 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
      */
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
         when {
-            getPrefString(PreferKey.prevKeys)?.contains(keyCode.toString()) == true -> {
+            ReadBookActivityHelp.isPrevKey(this, keyCode) -> {
                 if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
                     page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.PREV)
                     return true
                 }
             }
-            getPrefString(PreferKey.nextKeys)?.contains(keyCode.toString()) == true -> {
+            ReadBookActivityHelp.isNextKey(this, keyCode) -> {
                 if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
                     page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.NEXT)
                     return true

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivityHelp.kt

@@ -13,6 +13,7 @@ import android.view.WindowManager
 import android.widget.EditText
 import io.legado.app.App
 import io.legado.app.R
+import io.legado.app.constant.PreferKey
 import io.legado.app.data.entities.Bookmark
 import io.legado.app.help.AppConfig
 import io.legado.app.help.ReadBookConfig
@@ -24,6 +25,7 @@ import io.legado.app.service.help.CacheBook
 import io.legado.app.service.help.ReadBook
 import io.legado.app.ui.widget.text.AutoCompleteTextView
 import io.legado.app.utils.applyTint
+import io.legado.app.utils.getPrefString
 import io.legado.app.utils.requestInputMethod
 import kotlinx.android.synthetic.main.dialog_download_choice.view.*
 import kotlinx.android.synthetic.main.dialog_edit_text.view.*
@@ -186,4 +188,14 @@ object ReadBookActivityHelp {
             cancelButton()
         }.show().applyTint()
     }
+
+    fun isPrevKey(context: Context, keyCode: Int): Boolean {
+        val prevKeysStr = context.getPrefString(PreferKey.prevKeys)
+        return prevKeysStr?.split(",")?.contains(keyCode.toString()) ?: false
+    }
+
+    fun isNextKey(context: Context, keyCode: Int): Boolean {
+        val nextKeysStr = context.getPrefString(PreferKey.nextKeys)
+        return nextKeysStr?.split(",")?.contains(keyCode.toString()) ?: false
+    }
 }