[Firebase_messaging] Fix Deprecated API usage (#136)

* Upgrade firebase-messaging to 20.0.0
* Suppress unchecked warnings

Author: ashutoshkmr

packages/firebase_messaging/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 5.1.6
+
+* Fix warnings when compiling on Android.
+
 ## 5.1.5
 
 * Enable background message handling on Android.

packages/firebase_messaging/android/build.gradle

@@ -45,7 +45,7 @@ android {
         disable 'InvalidPackage'
     }
     dependencies {
-        api 'com.google.firebase:firebase-messaging:18.0.0'
+        api 'com.google.firebase:firebase-messaging:20.0.0'
         implementation 'com.google.firebase:firebase-common:16.1.0'
         implementation 'androidx.annotation:annotation:1.0.0'
         implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'

packages/firebase_messaging/android/src/main/java/io/flutter/plugins/firebasemessaging/FirebaseMessagingPlugin.java

@@ -121,6 +121,7 @@ public void onMethodCall(final MethodCall call, final Result result) {
       long setupCallbackHandle = 0;
       long backgroundMessageHandle = 0;
       try {
+        @SuppressWarnings("unchecked")
         Map<String, Long> callbacks = ((Map<String, Long>) call.arguments);
         setupCallbackHandle = callbacks.get("setupHandle");
         backgroundMessageHandle = callbacks.get("backgroundHandle");

packages/firebase_messaging/android/src/main/java/io/flutter/plugins/firebasemessaging/FlutterFirebaseMessagingService.java

@@ -140,7 +140,7 @@ public void onNewToken(String token) {
    */
   public static void startBackgroundIsolate(Context context, long callbackHandle) {
     FlutterMain.ensureInitializationComplete(context, null);
-    String appBundlePath = FlutterMain.findAppBundlePath(context);
+    String appBundlePath = FlutterMain.findAppBundlePath();
     FlutterCallbackInformation flutterCallback =
         FlutterCallbackInformation.lookupCallbackInformation(callbackHandle);
     if (flutterCallback == null) {
@@ -309,7 +309,7 @@ private static boolean isApplicationForeground(Context context) {
     KeyguardManager keyguardManager =
         (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
 
-    if (keyguardManager.inKeyguardRestrictedInputMode()) {
+    if (keyguardManager.isKeyguardLocked()) {
       return false;
     }
     int myPid = Process.myPid();

packages/firebase_messaging/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for Firebase Cloud Messaging, a cross-platform
   messaging solution that lets you reliably deliver messages on Android and iOS.
 author: Flutter Team <[email protected]>
 homepage: https://github.com/FirebaseExtended/flutterfire/tree/master/packages/firebase_messaging
-version: 5.1.5
+version: 5.1.6
 
 flutter:
   plugin: