feat: 优化

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

@@ -280,6 +280,18 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
      */
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
         when (keyCode) {
+            getPrefInt(PreferKey.prevKey) -> {
+                if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
+                    page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.PREV)
+                    return true
+                }
+            }
+            getPrefInt(PreferKey.nextKey) -> {
+                if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
+                    page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.NEXT)
+                    return true
+                }
+            }
             KeyEvent.KEYCODE_VOLUME_UP -> {
                 if (volumeKeyPage(PageDelegate.Direction.PREV)) {
                     return true
@@ -294,18 +306,6 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
                 page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.NEXT)
                 return true
             }
-            getPrefInt(PreferKey.prevKey) -> {
-                if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
-                    page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.PREV)
-                    return true
-                }
-            }
-            getPrefInt(PreferKey.nextKey) -> {
-                if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
-                    page_view.pageDelegate?.keyTurnPage(PageDelegate.Direction.NEXT)
-                    return true
-                }
-            }
         }
         return super.onKeyDown(keyCode, event)
     }