add android example

example/android/app/src/main/AndroidManifest.xml

@@ -7,7 +7,7 @@
          FlutterApplication and put your custom class here. -->
     <uses-permission android:name="android.permission.INTERNET"/>
     <application
-        android:name="io.flutter.app.FlutterApplication"
+        android:name=".Application"
         android:label="example"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -17,6 +17,10 @@
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>