small state cleanup

app/src/main/java/org/cocos2dx/lib/Cocos2dxGLSurfaceView.kt

@@ -119,12 +119,8 @@ class Cocos2dxGLSurfaceView(context: Context) : GLSurfaceView(context) {
     }
 
     @RequiresApi(Build.VERSION_CODES.R)
-    fun updateRefreshRate() {
-        val maxRefreshRate = display.supportedModes.maxBy { it.refreshRate }.refreshRate
-        holder.surface.setFrameRate(
-            maxRefreshRate,
-            Surface.FRAME_RATE_COMPATIBILITY_DEFAULT
-        )
+    fun updateRefreshRate(refreshRate: Float) {
+        holder.surface.setFrameRate(refreshRate, Surface.FRAME_RATE_COMPATIBILITY_DEFAULT)
     }
 
     override fun onPause() {

app/src/main/java/org/cocos2dx/lib/Cocos2dxRenderer.kt

@@ -64,7 +64,7 @@ class Cocos2dxRenderer(private var handler: Cocos2dxGLSurfaceView) : GLSurfaceVi
     private var screenWidth = 0
     private var screenHeight = 0
     var sendResizeEvents = false
-    var setFrameRate = false
+    var setFrameRate: Float? = null
     private var mAnimationInterval: Long? = null
 
     fun limitFrameRate(rate: Int) {
@@ -82,8 +82,9 @@ class Cocos2dxRenderer(private var handler: Cocos2dxGLSurfaceView) : GLSurfaceVi
     }
 
     override fun onSurfaceChanged(gl10: GL10?, width: Int, height: Int) {
-        if (setFrameRate && Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            handler.updateRefreshRate()
+        val chosenRefreshRate = setFrameRate
+        if (chosenRefreshRate != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            handler.updateRefreshRate(chosenRefreshRate)
         }
     }