Implemented receiving intent on android side

android/app/src/main/AndroidManifest.xml

@@ -24,7 +24,11 @@
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
-
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="text/plain" />
+            </intent-filter>
         </activity>
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->

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

@@ -1,5 +1,44 @@
 package com.example.maps_bookmarks
 
+import android.content.Intent
+import android.os.Bundle
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
 
-class MainActivity : FlutterActivity()
+class MainActivity: FlutterActivity() {
+    private var sharedText: String? = null
+    private val CHANNEL = "app.channel.shared.data"
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        handleIntent(intent)
+    }
+
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        setIntent(intent)
+        handleIntent(intent)
+    }
+
+    private fun handleIntent(intent: Intent) {
+        val action = intent.action
+        val type = intent.type
+
+        if (Intent.ACTION_SEND == action && "text/plain" == type) {
+            sharedText = intent.getStringExtra(Intent.EXTRA_TEXT)
+        }
+    }
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL)
+            .setMethodCallHandler { call, result ->
+                if (call.method == "getSharedText") {
+                    result.success(sharedText)
+                    sharedText = null
+                } else {
+                    result.notImplemented()
+                }
+            }
+    }
+}