feat: demonstrate asking for post notification permission

Author: kroikie

messaging/app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 32
+    compileSdkVersion 33
 
     defaultConfig {
         applicationId "com.google.firebase.example.messaging"

messaging/app/src/main/java/com/google/firebase/example/messaging/MainActivity.java

@@ -1,10 +1,16 @@
 package com.google.firebase.example.messaging;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
+import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+
 import android.util.Log;
 import android.widget.Toast;
 
@@ -19,6 +25,7 @@
 public class MainActivity extends AppCompatActivity {
 
     private static final String TAG = "MainActivity";
+    private static final int NOTIFICATION_REQUEST_CODE = 1234;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -102,4 +109,41 @@ public void onComplete(@NonNull Task<String> task) {
                 });
         // [END log_reg_token]
     }
+
+    @RequiresApi(33)
+    // [START ask_post_notifications]
+    private void askNotificationPermission() {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS) ==
+                PackageManager.PERMISSION_GRANTED) {
+            // FCM SDK (and your app) can post notifications.
+        } else if (shouldShowRequestPermissionRationale(Manifest.permission.POST_NOTIFICATIONS)) {
+            // TODO: display an educational UI explaining to the user the features that will be enabled
+            //       by them granting the POST_NOTIFICATION permission. This UI should provide the user
+            //       "OK" and "No thanks" buttons. If the user selects "OK" directly request the permission.
+            //       If the user selects "No thanks" allow the user to continue without notifications.
+        } else {
+            // Directly ask for the permission
+            requestPermissions(new String[] { Manifest.permission.POST_NOTIFICATIONS }, NOTIFICATION_REQUEST_CODE);
+        }
+    }
+    // [END ask_post_notifications]
+
+    // [START handle_ask_post_notifications_request]
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String[] permissions,
+                                           int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        switch (requestCode) {
+            case NOTIFICATION_REQUEST_CODE:
+                // If request is cancelled, the result arrays are empty.
+                if (grantResults.length > 0 &&
+                        grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    // FCM SDK (and your app) can post notifications.
+                } else {
+                    // TODO: Inform user that that your app will not show notifications
+                }
+                return;
+        }
+    }
+    // [END handle_ask_post_notifications_request]
 }