Screenshot Prevention and backgorund Screen blacking

android/app/src/main/kotlin/com/example/kmobile/MainActivity.kt

@@ -1,5 +1,12 @@
 package com.example.kmobile
-
 import io.flutter.embedding.android.FlutterFragmentActivity
+ import io.flutter.embedding.android.FlutterActivity
+ import android.view.WindowManager.LayoutParams
+ import android.os.Bundle
 
-class MainActivity: FlutterFragmentActivity() 
+class MainActivity: FlutterFragmentActivity() {
+         override fun onCreate(savedInstanceState: Bundle?) {
+         super.onCreate(savedInstanceState)
+         window.addFlags(LayoutParams.FLAG_SECURE)
+     }
+ }