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import 'package:flutter/material.dart';
import 'package:android_libcpp_shared/android_libcpp_shared.dart';
import 'dart:ffi' as ffi;
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) => MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(primarySwatch: Colors.blue),
home: const MyHomePage(),
);
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key});
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
late final ffi.DynamicLibrary? _lib;
late final int Function()? _randFunc;
int _randomNumber = -1;
@override
void initState() {
super.initState();
_randomNumber = -1; // Initialize with an invalid random number.
_lib = libCppShared;
if (_lib != null) {
_randFunc = _lib
.lookup<ffi.NativeFunction<ffi.Int64 Function()>>('rand')
.asFunction<int Function()>();
} else {
_randFunc = null;
}
getRandomInt();
}
/// Example of using a foreign function from libc++_shared.so.
/// Generate a random number between 0 and 99 using the C standard library's
/// rand() function.
void getRandomInt() {
if (_lib == null || _randFunc == null) {
return;
}
final time = _randFunc();
setState(() {
_randomNumber = time % 100; // Get a number between 0 and 99.
});
}
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(title: const Text('Android libc++_shared.so Example')),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
_lib != null
? 'Random number from libc++_shared.so: $_randomNumber'
: 'libc++_shared.so is not available on this platform.',
textAlign: TextAlign.center,
),
ElevatedButton(
onPressed: () => getRandomInt(),
child: const Text('Generate Random Number'),
),
],
),
),
);
@override
void dispose() {
_lib?.close();
super.dispose();
}
}