refactor: Kotlin Native platformChannel

.vscode/launch.json

@@ -7,39 +7,8 @@
         {
             "name": "no_screenshot",
             "request": "launch",
-            "type": "dart"
-        },
-        {
-            "name": "no_screenshot (profile mode)",
-            "request": "launch",
-            "type": "dart",
-            "flutterMode": "profile"
-        },
-        {
-            "name": "no_screenshot (release mode)",
-            "request": "launch",
-            "type": "dart",
-            "flutterMode": "release"
-        },
-        {
-            "name": "example",
-            "cwd": "example",
-            "request": "launch",
-            "type": "dart"
-        },
-        {
-            "name": "example (profile mode)",
-            "cwd": "example",
-            "request": "launch",
-            "type": "dart",
-            "flutterMode": "profile"
-        },
-        {
-            "name": "example (release mode)",
-            "cwd": "example",
-            "request": "launch",
-            "type": "dart",
-            "flutterMode": "release"
+            "type": "dart", 
+            "program": "example/lib/main.dart"
         }
     ]
 }

LICENSE

@@ -1,26 +1,26 @@
-Copyright (c) 2022, FlutterPlaza 
-All rights reserved. 
+Copyright (c) 2022, FlutterPlaza
+All rights reserved.
 
-Redistribution and use in source and binary forms, with or without 
-modification, are permitted provided that the following conditions are met: 
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
 
- * Redistributions of source code must retain the above copyright notice, 
-   this list of conditions and the following disclaimer. 
- * Redistributions in binary form must reproduce the above copyright 
-   notice, this list of conditions and the following disclaimer in the 
-   documentation and/or other materials provided with the distribution. 
- * Neither the name of FlutterPlaza nor the names of its contributors may 
-   be used to endorse or promote products derived from this software 
-   without specific prior written permission. 
+* Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+* Neither the name of FlutterPlaza nor the names of its contributors may
+   be used to endorse or promote products derived from this software
+   without specific prior written permission.
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
-ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
-LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
-POSSIBILITY OF SUCH DAMAGE. 
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

android/src/main/kotlin/com/flutterplaza/no_screenshot/NoScreenshotPlugin.kt

@@ -9,71 +9,89 @@ import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
-import android.view.WindowManager.LayoutParams;
+import android.view.WindowManager.LayoutParams
 import io.flutter.embedding.engine.plugins.activity.ActivityAware
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
 
+const val SCREENSHOT_ON_CONST = "screenshotOn"
+const val SCREENSHOT_OFF_CONST = "screenshotOff"
+const val TOGGLE_SCREENSHOT_CONST = "toggleScreenshot"
 
 /** NoScreenshotPlugin */
-class NoScreenshotPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
-  /// The MethodChannel that will the communication between Flutter and native Android
-  ///
-  /// This local reference serves to register the plugin with the Flutter Engine and unregister it
-  /// when the Flutter Engine is detached from the Activity
-  private lateinit var channel : MethodChannel
-  private lateinit var context: Context
-  private lateinit var activity: Activity
-
-  override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
-    channel = MethodChannel(flutterPluginBinding.binaryMessenger, "com.flutterplaza.no_screenshot")
-    channel.setMethodCallHandler(this)
-    context = flutterPluginBinding.applicationContext
-
-  }
-
-  override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) =
-    if (call.method == "screenshotOff") {
-        screenshotOff();
-      result.success(true);
-    }
-    else if(call.method == "screenshotOn"){
-     screenshotOn();
-      result.success(true);
-    }
-    else if(call.method == "toggleScreenshot"){
-      var flags: Int = activity.window.attributes.flags;
-     if( (flags and LayoutParams.FLAG_SECURE) != 0){
-       screenshotOn();
-      }else {
-        screenshotOff();
-     }
-      result.success(true);
+class NoScreenshotPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
+    /// The MethodChannel that will the communication between Flutter and native Android
+    ///
+    /// This local reference serves to register the plugin with the Flutter Engine and unregister it
+    /// when the Flutter Engine is detached from the Activity
+    private lateinit var channel: MethodChannel
+    private lateinit var context: Context
+    private lateinit var activity: Activity
+
+    override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
+        channel =
+            MethodChannel(flutterPluginBinding.binaryMessenger, "com.flutterplaza.no_screenshot")
+        channel.setMethodCallHandler(this)
+        context = flutterPluginBinding.applicationContext
+
     }
-    else {
-      result.notImplemented()
+
+    override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) =
+        when (call.method) {
+            SCREENSHOT_OFF_CONST -> {
+                val value: Boolean = screenshotOff()
+                result.success(value)
+            }
+            SCREENSHOT_ON_CONST -> {
+                val value = screenshotOn()
+
+                result.success(value)
+            }
+            TOGGLE_SCREENSHOT_CONST -> {
+                val flags: Int = activity.window.attributes.flags
+                if ((flags and LayoutParams.FLAG_SECURE) != 0) {
+                    screenshotOn()
+                } else {
+                    screenshotOff()
+                }
+                result.success(true)
+            }
+            else -> {
+                result.notImplemented()
+            }
+        }
+
+    private fun screenshotOff(): Boolean {
+        try {
+            activity.window.addFlags(LayoutParams.FLAG_SECURE)
+            return true
+        } catch (e: Exception) {
+            return false
+        }
     }
 
-  private fun screenshotOff(){
-    activity.window.addFlags(LayoutParams.FLAG_SECURE);
-  }
-  private  fun screenshotOn(){
-    activity.window.clearFlags(LayoutParams.FLAG_SECURE);
-  }
+    private fun screenshotOn() : Boolean{
+        try {
+            activity.window.clearFlags(LayoutParams.FLAG_SECURE)
+            return true
+        } catch (e: Exception) {
+            return false
+        }
+    }
 
-  override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
-    channel.setMethodCallHandler(null)
-  }
+    override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
+        channel.setMethodCallHandler(null)
+    }
 
-  override fun onAttachedToActivity(binding: ActivityPluginBinding) {
-    activity = binding.activity;
-  }
+    override fun onAttachedToActivity(binding: ActivityPluginBinding) {
+        activity = binding.activity
+    }
 
   override fun onDetachedFromActivityForConfigChanges() {}
 
-  override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
-    activity = binding.activity;
+    override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
+        activity = binding.activity
 
-  }
+    }
 
   override fun onDetachedFromActivity() {}
 }

example/android/app/build.gradle

@@ -43,7 +43,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.flutterplaza.no_screenshot_example"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.

example/lib/main.dart

@@ -35,21 +35,21 @@ class _MyAppState extends State<MyApp> {
               child: const Text('Press to toggle screenshot'),
               onPressed: () async {
                 final result = await _noScreenshot.toggleScreenshot();
-                print(result);
+                debugPrint(result.toString());
               },
             ),
             ElevatedButton(
               child: const Text('Press to turn off screenshot'),
               onPressed: () async {
                 final result = await _noScreenshot.screenshotOff();
-                print(result);
+                debugPrint(result.toString());
               },
             ),
             ElevatedButton(
               child: const Text('Press to turn on screenshot'),
               onPressed: () async {
                 final result = await _noScreenshot.screenshotOn();
-                print(result);
+                debugPrint(result.toString());
               },
             ),
           ],