[Android][Kotlin] fixed build after decomission of jcenter and gradle update (#7840)

* [Android] fixed build after decomission of jcenter

JCenter[1] has been removed and now is failing android build. This
change updates the configuration to remove this and few other warnings.

1 - https://developer.android.com/studio/build/jcenter-migration

* [Kotlin] fix build for latest gradle version 8.0.1

---------

Co-authored-by: Derek Bailey <derekbailey@google.com>

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="com.flatbuffers.app">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
   <application
     android:allowBackup="true"
@@ -9,7 +8,8 @@
     android:roundIcon="@mipmap/ic_launcher_round"
     android:supportsRtl="true"
     android:theme="@style/AppTheme">
-    <activity android:name=".MainActivity">
+    <activity android:name=".MainActivity"
+      android:exported="true">
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />
 

android/app/src/main/cpp/generated/animal_generated.h

@@ -8,9 +8,9 @@
 
 // Ensure the included flatbuffers.h is the same version as when this file was
 // generated, otherwise it may not be compatible.
-static_assert(FLATBUFFERS_VERSION_MAJOR == 2 &&
-              FLATBUFFERS_VERSION_MINOR == 0 &&
-              FLATBUFFERS_VERSION_REVISION == 8,
+static_assert(FLATBUFFERS_VERSION_MAJOR == 23 &&
+              FLATBUFFERS_VERSION_MINOR == 1 &&
+              FLATBUFFERS_VERSION_REVISION == 21,
              "Non-compatible flatbuffers version included");
 
 namespace com {
@@ -20,23 +20,23 @@ namespace app {
 struct Animal;
 struct AnimalBuilder;
 
-struct Animal FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
+struct Animal FLATBUFFERS_FINAL_CLASS : private ::flatbuffers::Table {
   typedef AnimalBuilder Builder;
   enum FlatBuffersVTableOffset FLATBUFFERS_VTABLE_UNDERLYING_TYPE {
     VT_NAME = 4,
     VT_SOUND = 6,
     VT_WEIGHT = 8
   };
-  const flatbuffers::String *name() const {
-    return GetPointer<const flatbuffers::String *>(VT_NAME);
+  const ::flatbuffers::String *name() const {
+    return GetPointer<const ::flatbuffers::String *>(VT_NAME);
   }
-  const flatbuffers::String *sound() const {
-    return GetPointer<const flatbuffers::String *>(VT_SOUND);
+  const ::flatbuffers::String *sound() const {
+    return GetPointer<const ::flatbuffers::String *>(VT_SOUND);
   }
   uint16_t weight() const {
     return GetField<uint16_t>(VT_WEIGHT, 0);
   }
-  bool Verify(flatbuffers::Verifier &verifier) const {
+  bool Verify(::flatbuffers::Verifier &verifier) const {
     return VerifyTableStart(verifier) &&
            VerifyOffset(verifier, VT_NAME) &&
            verifier.VerifyString(name()) &&
@@ -49,32 +49,32 @@ struct Animal FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
 
 struct AnimalBuilder {
   typedef Animal Table;
-  flatbuffers::FlatBufferBuilder &fbb_;
-  flatbuffers::uoffset_t start_;
-  void add_name(flatbuffers::Offset<flatbuffers::String> name) {
+  ::flatbuffers::FlatBufferBuilder &fbb_;
+  ::flatbuffers::uoffset_t start_;
+  void add_name(::flatbuffers::Offset<::flatbuffers::String> name) {
     fbb_.AddOffset(Animal::VT_NAME, name);
   }
-  void add_sound(flatbuffers::Offset<flatbuffers::String> sound) {
+  void add_sound(::flatbuffers::Offset<::flatbuffers::String> sound) {
     fbb_.AddOffset(Animal::VT_SOUND, sound);
   }
   void add_weight(uint16_t weight) {
     fbb_.AddElement<uint16_t>(Animal::VT_WEIGHT, weight, 0);
   }
-  explicit AnimalBuilder(flatbuffers::FlatBufferBuilder &_fbb)
+  explicit AnimalBuilder(::flatbuffers::FlatBufferBuilder &_fbb)
         : fbb_(_fbb) {
     start_ = fbb_.StartTable();
   }
-  flatbuffers::Offset<Animal> Finish() {
+  ::flatbuffers::Offset<Animal> Finish() {
     const auto end = fbb_.EndTable(start_);
-    auto o = flatbuffers::Offset<Animal>(end);
+    auto o = ::flatbuffers::Offset<Animal>(end);
     return o;
   }
 };
 
-inline flatbuffers::Offset<Animal> CreateAnimal(
-    flatbuffers::FlatBufferBuilder &_fbb,
-    flatbuffers::Offset<flatbuffers::String> name = 0,
-    flatbuffers::Offset<flatbuffers::String> sound = 0,
+inline ::flatbuffers::Offset<Animal> CreateAnimal(
+    ::flatbuffers::FlatBufferBuilder &_fbb,
+    ::flatbuffers::Offset<::flatbuffers::String> name = 0,
+    ::flatbuffers::Offset<::flatbuffers::String> sound = 0,
     uint16_t weight = 0) {
   AnimalBuilder builder_(_fbb);
   builder_.add_sound(sound);
@@ -83,8 +83,8 @@ inline flatbuffers::Offset<Animal> CreateAnimal(
   return builder_.Finish();
 }
 
-inline flatbuffers::Offset<Animal> CreateAnimalDirect(
-    flatbuffers::FlatBufferBuilder &_fbb,
+inline ::flatbuffers::Offset<Animal> CreateAnimalDirect(
+    ::flatbuffers::FlatBufferBuilder &_fbb,
     const char *name = nullptr,
     const char *sound = nullptr,
     uint16_t weight = 0) {
@@ -98,32 +98,32 @@ inline flatbuffers::Offset<Animal> CreateAnimalDirect(
 }
 
 inline const com::fbs::app::Animal *GetAnimal(const void *buf) {
-  return flatbuffers::GetRoot<com::fbs::app::Animal>(buf);
+  return ::flatbuffers::GetRoot<com::fbs::app::Animal>(buf);
 }
 
 inline const com::fbs::app::Animal *GetSizePrefixedAnimal(const void *buf) {
-  return flatbuffers::GetSizePrefixedRoot<com::fbs::app::Animal>(buf);
+  return ::flatbuffers::GetSizePrefixedRoot<com::fbs::app::Animal>(buf);
 }
 
 inline bool VerifyAnimalBuffer(
-    flatbuffers::Verifier &verifier) {
+    ::flatbuffers::Verifier &verifier) {
   return verifier.VerifyBuffer<com::fbs::app::Animal>(nullptr);
 }
 
 inline bool VerifySizePrefixedAnimalBuffer(
-    flatbuffers::Verifier &verifier) {
+    ::flatbuffers::Verifier &verifier) {
   return verifier.VerifySizePrefixedBuffer<com::fbs::app::Animal>(nullptr);
 }
 
 inline void FinishAnimalBuffer(
-    flatbuffers::FlatBufferBuilder &fbb,
-    flatbuffers::Offset<com::fbs::app::Animal> root) {
+    ::flatbuffers::FlatBufferBuilder &fbb,
+    ::flatbuffers::Offset<com::fbs::app::Animal> root) {
   fbb.Finish(root);
 }
 
 inline void FinishSizePrefixedAnimalBuffer(
-    flatbuffers::FlatBufferBuilder &fbb,
-    flatbuffers::Offset<com::fbs::app::Animal> root) {
+    ::flatbuffers::FlatBufferBuilder &fbb,
+    ::flatbuffers::Offset<com::fbs::app::Animal> root) {
   fbb.FinishSizePrefixed(root);
 }
 

android/app/src/main/java/generated/com/fbs/app/Animal.kt

@@ -19,6 +19,7 @@ import java.nio.ByteOrder
 import kotlin.math.sign
 
 @Suppress("unused")
+@kotlin.ExperimentalUnsignedTypes
 class Animal : Table() {
 
     fun __init(_i: Int, _bb: ByteBuffer)  {
@@ -31,14 +32,22 @@ class Animal : Table() {
     val name : String?
         get() {
             val o = __offset(4)
-            return if (o != 0) __string(o + bb_pos) else null
+            return if (o != 0) {
+                __string(o + bb_pos)
+            } else {
+                null
+            }
         }
     val nameAsByteBuffer : ByteBuffer get() = __vector_as_bytebuffer(4, 1)
     fun nameInByteBuffer(_bb: ByteBuffer) : ByteBuffer = __vector_in_bytebuffer(_bb, 4, 1)
     val sound : String?
         get() {
             val o = __offset(6)
-            return if (o != 0) __string(o + bb_pos) else null
+            return if (o != 0) {
+                __string(o + bb_pos)
+            } else {
+                null
+            }
         }
     val soundAsByteBuffer : ByteBuffer get() = __vector_as_bytebuffer(6, 1)
     fun soundInByteBuffer(_bb: ByteBuffer) : ByteBuffer = __vector_in_bytebuffer(_bb, 6, 1)