class MyCrashTestApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('APM异常捕获测试')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              // 1. 同步异常测试
              ElevatedButton(
                child: const Text('触发同步异常'),
                onPressed: () => _throwSyncException(),
              ),
              
              const SizedBox(height: 20),
              
              // 2. 异步异常测试
              ElevatedButton(
                child: const Text('触发异步异常'),
                onPressed: () => _throwAsyncException(),
              ),
              
              const SizedBox(height: 20),
              
              // 3. Widget构建异常
              ElevatedButton(
                child: const Text('触发Widget异常'),
                onPressed: () => Navigator.push(
                  context, 
                  MaterialPageRoute(builder: (_) => FaultyWidget())
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  // 同步异常示例
  void _throwSyncException() {
      // 模拟业务逻辑错误
      final list = [];
      print(list[0]); // 越界访问
  }

  // 异步异常示例
  Future<void> _throwAsyncException() async {
      await Future.delayed(Duration(milliseconds: 500));
      // 模拟异步错误
      dynamic nullObject = null;
      print(nullObject.length); // NoSuchMethodError
  }
}

// 会抛出异常的Widget
class FaultyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // 故意构造一个会抛出异常的build方法
    if (DateTime.now().millisecond % 2 == 0) {
      return Container(color: Colors.blue);
    }
    throw Exception('Widget构建时随机异常');
  }
}