一、性能优化概述

Platform Channel通信涉及跨平台数据序列化，合理优化可以显著提升性能。

|| 优化点 | 说明 | 效果 |
|---------|------|------|
| 减少调用次数 | 批量处理数据 | 显著提升 |
| 数据压缩 | 减少传输大小 | 中等提升 |
| 缓存机制 | 避免重复调用 | 显著提升 |
| 异步处理 | 不阻塞UI | 高体验提升 |

二、优化策略

class _Page07Performance extends StatefulWidget {
  const _Page07Performance();

  @override
  State<_Page07Performance> createState() => _Page07PerformanceState();
}

class _Page07PerformanceState extends State<_Page07Performance> {
  static const platform = MethodChannel('com.example.demo/perf');
  final Map<String, String> _cache = {};
  String _result = '';
  bool _isLoading = false;

  Future<void> _callWithCache(String key) async {
    setState(() {
      _isLoading = true;
      _result = '检查缓存...';
    });

    // 使用缓存优化
    if (_cache.containsKey(key)) {
      await Future.delayed(const Duration(milliseconds: 100));
      setState(() {
        _result = '缓存命中: ${_cache[key]}';
        _isLoading = false;
      });
      return;
    }

    // 模拟API调用
    await Future.delayed(const Duration(seconds: 1));
    final value = '数据_${key}_${DateTime.now().millisecond}';
    _cache[key] = value;

    if (mounted) {
      setState(() {
        _result = 'API调用: $value';
        _isLoading = false;
      });
    }
  }

  void _clearCache() {
    setState(() {
      _cache.clear();
      _result = '缓存已清除';
    });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.indigo.shade50,
      padding: const EdgeInsets.all(20),
      child: Column(
        children: [
          Container(
            padding: const EdgeInsets.all(20),
            decoration: BoxDecoration(
              color: Colors.indigo.shade600,
              borderRadius: BorderRadius.circular(20),
            ),
            child: const Column(
              children: [
                Icon(Icons.speed, size: 48, color: Colors.white),
                SizedBox(height: 16),
                Text(
                  '性能优化',
                  style: TextStyle(fontSize: 28, fontWeight: FontWeight.bold, color: Colors.white),
                ),
                SizedBox(height: 8),
                Text('Performance - 页面 7/10', style: TextStyle(color: Colors.white70)),
              ],
            ),
          ),
          const SizedBox(height: 24),
          Expanded(
            child: Container(
              padding: const EdgeInsets.all(20),
              decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(20)),
              child: Column(
                children: [
                  const Text('缓存状态:', style: TextStyle(fontWeight: FontWeight.bold)),
                  const SizedBox(height: 10),
                  Expanded(
                    child: _cache.isEmpty
                        ? const Center(child: Text('缓存为空', style: TextStyle(color: Colors.grey)))
                        : ListView.builder(
                            itemCount: _cache.length,
                            itemBuilder: (context, index) {
                              final key = _cache.keys.elementAt(index);
                              return ListTile(
                                leading: const Icon(Icons.cache, color: Colors.indigo),
                                title: Text(key),
                                subtitle: Text(_cache[key] ?? ''),
                              );
                            },
                          ),
                  ),
                  const SizedBox(height: 20),
                  if (_result.isNotEmpty)
                    Container(
                      padding: const EdgeInsets.all(12),
                      decoration: BoxDecoration(
                        color: Colors.indigo.shade100,
                        borderRadius: BorderRadius.circular(8),
                      ),
                      child: Text(_result),
                    ),
                  const SizedBox(height: 10),
                  Row(
                    children: [
                      Expanded(
                        child: ElevatedButton(
                          onPressed: _isLoading ? null : () => _callWithCache('user_data'),
                          style: ElevatedButton.styleFrom(backgroundColor: Colors.indigo.shade600),
                          child: const Text('调用(缓存)', style: TextStyle(color: Colors.white)),
                        ),
                      ),
                      const SizedBox(width: 10),
                      Expanded(
                        child: ElevatedButton(
                          onPressed: _clearCache,
                          style: ElevatedButton.styleFrom(backgroundColor: Colors.red.shade600),
                          child: const Text('清除缓存', style: TextStyle(color: Colors.white)),
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

三、性能对比

四、常见问题

五、优化技巧

六、最佳实践

• ✅ 评估调用频率
• ✅ 使用适当缓存策略
• ✅ 监控性能指标
• ✅ 平衡性能和内存

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