{"id":639,"date":"2025-08-17T01:48:32","date_gmt":"2025-08-17T01:48:32","guid":{"rendered":"https:\/\/boochlin.com\/?p=639"},"modified":"2026-09-19T17:04:06","modified_gmt":"2026-09-19T17:04:06","slug":"kotlin-init-%e5%89%8d%e5%88%9d%e5%a7%8b%e5%8c%96%e5%b1%ac%e6%80%a7%e6%9c%83%e7%99%bc%e7%94%9f%e5%95%a5%e4%ba%8b","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=639","title":{"rendered":"kotlin init \u524d\u521d\u59cb\u5316\u5c6c\u6027\u6703\u767c\u751f\u5565\u4e8b"},"content":{"rendered":"

\u5728\u5beb Kotlin \u6642\uff0c\u6211\u5011\u5e38\u5e38\u6703\u628a\u8b8a\u6578\u5ba3\u544a\u653e\u5728\u5f8c\u9762\uff0c\u6216\u8005\u5728 init<\/code> \u88e1\u505a\u4e00\u5806\u521d\u59cb\u5316\u7684\u4e8b\u3002<\/p>\n

\u4f46\u5f88\u591a\u4eba\u6c92\u641e\u6e05\u695a\u4e00\u4ef6\u4e8b\uff1aKotlin \u7684\u5c6c\u6027\u521d\u59cb\u5316\uff08Property Initializer\uff09\u8ddf init<\/code> \u5340\u584a\uff0c\u5230\u5e95\u662f\u8ab0\u5148\u8ab0\u5f8c\uff1f<\/strong><\/p>\n

\u7c21\u55ae\u4f86\u8aaa\uff1a\u5b83\u5011\u662f\u6309\u7167\u5728\u7a0b\u5f0f\u78bc\u4e2d\u51fa\u73fe\u7684\u9806\u5e8f\uff0c\u7531\u4e0a\u5230\u4e0b\u6392\u968a\u57f7\u884c\u7684\u3002<\/strong><\/p>\n

\u5982\u679c\u4f60\u5728\u540c\u6b65\u4ee3\u78bc\u88e1\u9806\u5e8f\u5beb\u53cd\u4e86\uff0c\u7de8\u8b6f\u5668\u6703\u7acb\u523b\u628a\u4f60\u6253\u9192\uff1b\u4f46\u6700\u53ef\u6015\u7684\u662f\u2014\u2014\u5982\u679c\u4f60\u5305\u4e86\u4e00\u5c64 viewModelScope.launch<\/code>\uff0c\u7de8\u8b6f\u5668\u5c45\u7136\u5c31\u88dd\u778e\u653e\u884c\u4e86\uff0c\u7136\u5f8c\u5728\u57f7\u884c\u671f\u76f4\u63a5\u9001\u4f60\u4e00\u9846\u5927\u96f7\u3002<\/strong><\/p>\n

\u5230\u5e95\u72af\u4e86\u4ec0\u9ebc\u5fcc\u8af1\uff1f\u6211\u5011\u76f4\u63a5\u770b\u7a0b\u5f0f\u78bc\u3002<\/p>\n

\n

\u72c0\u6cc1\u4e00\uff1a\u76f4\u63a5\u5728 init \u8b80\u4e0b\u65b9\u7684\u8b8a\u6578\uff0c\u7de8\u8b6f\u5668\u76f4\u63a5\u6253\u81c9<\/h2>\n

\u5148\u770b\u9019\u6bb5\u6700\u76f4\u89ba\u7684\u5beb\u6cd5\uff1a<\/p>\n

class<\/span> ItemEditViewModel<\/span>(\n    private<\/span> val<\/span> savedStateHandle: SavedStateHandle,\n    private<\/span> val<\/span> itemsRepository: ItemsRepository\n) : ViewModel() {\n\n    init<\/span> {\n        \/\/ \u274c \u7de8\u8b6f\u76f4\u63a5\u5831\u932f\uff1aVariable 'itemId' must be initialized<\/span>\n        val<\/span> stream = itemsRepository.getItemStream(itemId)\n        println("Item stream: $stream<\/span>"<\/span>)\n    }\n\n    \/\/ \u8b8a\u6578\u5ba3\u544a\u5728 init \u5340\u584a\u7684\u4e0b\u65b9<\/span>\n    private<\/span> val<\/span> itemId: Int<\/span> = checkNotNull(savedStateHandle["itemId"<\/span>])\n}<\/code><\/pre>\n
\u70ba\u4ec0\u9ebc\u9019\u6bb5\u7de8\u8b6f\u4e0d\u7d66\u904e\uff1f<\/h3>\n
\u56e0\u70ba Kotlin \u7de8\u8b6f\u5668\u6709\u505a\u78ba\u5b9a\u8ce6\u503c\u5206\u6790\uff08Definite Assignment Analysis\uff09<\/strong>\uff1a<\/p>\n
    \n
  1. \u7de8\u8b6f\u5668\u7531\u4e0a\u5f80\u4e0b\u6383\uff0c\u9032\u5230 init<\/code> \u6642\uff0c\u767c\u73fe itemId<\/code> \u5728\u8a9e\u6cd5\u6a39\u88e1\u6839\u672c\u9084\u6c92\u88ab\u7d66\u503c\u3002<\/li>\n
  2. val<\/code> \u627f\u8afe\u4e86\u300c\u4e0d\u53ef\u8b8a\u300d\u8ddf\u300c\u975e\u7a7a\u300d\uff0c\u4f60\u9084\u6c92\u521d\u59cb\u5316\u5c31\u60f3\u62ff\u4f86\u7528\uff0c\u9055\u53cd\u4e86\u578b\u5225\u5b89\u5168\u5408\u7d04\u3002<\/li>\n
  3. \u6240\u4ee5\u7de8\u8b6f\u5668\u76f4\u63a5\u62d2\u7d55\u7de8\u8b6f\uff0c\u5728\u7de8\u8b6f\u671f\u6551\u4e86\u4f60\u4e00\u547d\u3002<\/li>\n<\/ol>\n
    \n
    \u72c0\u6cc1\u4e8c\uff1a\u602a\u4e8b\u767c\u751f\u2014\u2014\u5305\u4e86\u4e00\u5c64 launch\uff0c\u7de8\u8b6f\u5668\u5c45\u7136\u653e\u884c\u4e86\uff1f<\/h2>\n
    \u4f46\u5728\u771f\u5be6\u5c08\u6848\u88e1\uff0c\u5f88\u591a\u4eba\u7684\u5beb\u6cd5\u662f\u9019\u6a23\uff1a<\/p>\n
    class<\/span> ItemEditViewModel<\/span>(\n    private<\/span> val<\/span> savedStateHandle: SavedStateHandle,\n    private<\/span> val<\/span> itemsRepository: ItemsRepository\n) : ViewModel() {\n\n    init<\/span> {\n        \/\/ \ud83e\udd14 \u5305\u4e86\u4e00\u5c64\u5354\u7a0b\uff0c\u7de8\u8b6f\u5c45\u7136\u795e\u5947\u5730\u904e\u4e86\uff1f\uff01<\/span>\n        viewModelScope.launch {\n            val<\/span> item = itemsRepository.getItemStream(itemId)\n                .filterNotNull()\n                .first()\n            println("Loaded Item: $item<\/span>, itemId is: $itemId<\/span>"<\/span>)\n        }\n    }\n\n    \/\/ \u4f9d\u7136\u5ba3\u544a\u5728 init \u4e0b\u65b9<\/span>\n    private<\/span> val<\/span> itemId: Int<\/span> = checkNotNull(savedStateHandle["itemId"<\/span>])\n}<\/code><\/pre>\n
    \u95dc\u9375\u554f\u984c\u4f86\u4e86\uff1a\u70ba\u4ec0\u9ebc\u591a\u4e86 launch \u5c31\u80fd\u7de8\u8b6f\uff1f<\/h3>\n
    \u56e0\u70ba viewModelScope.launch { ... }<\/code> \u88e1\u9762\u7684\u6771\u897f\uff0c\u672c\u8cea\u4e0a\u662f\u4e00\u500b Lambda \u9589\u5305\uff08Closure\uff09<\/strong>\uff1a<\/p>\n
      \n
    • \u5c0d\u7de8\u8b6f\u5668\u4f86\u8aaa\uff0cLambda \u662f\u300c\u672a\u4f86\u67d0\u500b\u975e\u540c\u6b65\u6642\u9593\u9ede\u300d\u624d\u6703\u88ab\u8abf\u7528\u7684\u7368\u7acb\u51fd\u5f0f\u3002<\/li>\n
    • \u7de8\u8b6f\u5668\u5728\u975c\u614b\u5206\u6790\u6642\uff0c\u6839\u672c\u731c\u4e0d\u5230\u9019\u500b\u5354\u7a0b\u5230\u5e95\u6703\u300c\u7acb\u523b\u8dd1\u300d\u9084\u662f\u300c\u4ee5\u5f8c\u624d\u8dd1\u300d\u3002<\/li>\n
    • \u7de8\u8b6f\u5668\u53ea\u78ba\u5b9a\u4e00\u4ef6\u4e8b\uff1a\u300c\u7b49\u9019\u500b\u985e\u5225\u5b8c\u6574\u5efa\u69cb\u5b8c\u4e4b\u5f8c\uff0citemId<\/code> \u80af\u5b9a\u6703\u6709\u503c\uff0c\u6240\u4ee5\u5728\u9589\u5305\u88e1\u9762\u5b58\u53d6\u5b83\u662f\u5408\u6cd5\u7684\u300d\u3002<\/li>\n
    • \u7d50\u679c\uff1a\u975c\u614b\u6aa2\u67e5\u76f4\u63a5\u88ab\u8de8\u4f5c\u7528\u57df\u7684\u9589\u5305\u7d66\u7a7f\u900f\u4e86\uff0c\u7de8\u8b6f\u5668\u9078\u64c7\u653e\u884c\uff01<\/strong><\/li>\n<\/ul>\n
      \n
      \u72c0\u6cc1\u4e09\uff1a\u9019\u7a0b\u5f0f\u78bc\u771f\u7684\u80fd\u8dd1\u55ce\uff1f\u88dd\u7f6e\u4e0a\u6c92\u4e8b\uff0c\u5beb\u6e2c\u8a66\u76f4\u63a5\u7ffb\u8eca<\/h2>\n
      \u65e2\u7136\u7de8\u8b6f\u904e\u4e86\uff0c\u90a3\u8dd1\u8d77\u4f86\u5230\u5e95\u6703\u600e\u6a23\uff1f\u9019\u5c31\u662f\u6700\u6298\u78e8\u4eba\u7684\u5730\u65b9\u2014\u2014\u5b83\u6703\u56e0\u70ba\u57f7\u884c\u74b0\u5883\u4e0d\u540c\u800c\u7522\u751f\u6642\u5dee Bug<\/strong>\u3002<\/p>\n
      1. \u5728\u624b\u6a5f\uff0f\u5be6\u6a5f\u4e0a\u8dd1\uff1a\u770b\u8d77\u4f86\u5b8c\u5168\u6b63\u5e38\uff08\u7d14\u5c6c\u5de7\u5408\uff09<\/h3>\n
      viewModelScope<\/code> \u9810\u8a2d\u8dd1\u5728 Dispatchers.Main<\/code>\uff1a<\/p>\n
        \n
      1. init<\/code> \u57f7\u884c\u5230 viewModelScope.launch<\/code> \u6642\uff0c\u5354\u7a0b\u4efb\u52d9\u53ea\u662f\u88ab\u5305\u6210\u4e00\u500b Runnable\uff0c\u4e1f\u9032 Android \u4e3b\u7dda\u7a0b\u7684 Main Looper MessageQueue<\/strong> \u6392\u968a\u3002<\/li>\n
      2. \u6b64\u6642\u4e3b\u7dda\u7a0b\u7e7c\u7e8c\u5f80\u4e0b\u8d70\uff0c\u57f7\u884c\u5230\u4e86 itemId<\/code> \u7684\u521d\u59cb\u5316\u8ce6\u503c\uff0c\u6574\u500b ViewModel \u5efa\u69cb\u5b8c\u6210\u3002<\/li>\n
      3. \u63a5\u8457 Looper \u8f2a\u8a62\uff0c\u624d\u8f2a\u5230\u525b\u624d\u6392\u968a\u7684\u5354\u7a0b\u57f7\u884c\uff0c\u9019\u6642\u5019 itemId<\/code> \u65e9\u5c31\u8ce6\u597d\u503c\u4e86\u3002<\/li>\n
      4. \u8868\u9762\u4e0a\u770b\u5b8c\u5168\u6c92\u4e8b\uff0c\u4f46\u9019\u5b8c\u5168\u662f\u64bf\u5230\u4e86 Looper \u4e8b\u4ef6\u6392\u968a\u7684\u4fbf\u5b9c\uff01<\/strong><\/li>\n<\/ol>\n
        2. \u5728\u55ae\u5143\u6e2c\u8a66\u4e2d\u8dd1\uff1a\u76f4\u63a5\u6293\u5305\uff0c\u5370\u51fa 0 \u751a\u81f3\u5674\u932f<\/h3>\n
        \u7576\u4f60\u5728\u5beb Unit Test\uff0c\u4e26\u7167\u8457\u5b98\u65b9\u63a8\u85a6\u4f7f\u7528\u6e2c\u8a66\u8abf\u5ea6\u5668\u6642\uff1a<\/p>\n
        @Test<\/span>\nfun<\/span> testLoadItem<\/span>()<\/span><\/span> = runTest {\n    \/\/ \u6e2c\u8a66\u74b0\u5883\u4e2d\u901a\u5e38\u4f7f\u7528 UnconfinedTestDispatcher<\/span>\n    Dispatchers.setMain(UnconfinedTestDispatcher())\n\n    val<\/span> viewModel = ItemEditViewModel(savedStateHandle, mockRepository)\n    \/\/ \ud83d\udca5 \u707d\u96e3\u767c\u751f\uff1aitemId \u8b80\u51fa\u4f86\u5c45\u7136\u662f 0\uff01<\/span>\n}<\/code><\/pre>\n
        \u5e95\u5c64\u5230\u5e95\u767c\u751f\u4e86\u5565\uff1f<\/h4>\n
          \n
        • UnconfinedTestDispatcher<\/code>\uff08\u6216\u751f\u7522\u74b0\u5883\u4e2d\u7684 Dispatchers.Unconfined<\/code> \/ Dispatchers.Main.immediate<\/code>\uff09\u6703\u76f4\u63a5\u5728\u7576\u524d\u7dda\u7a0b\u7acb\u523b\u5167\u806f\uff08Inline\uff09\u57f7\u884c\u5354\u7a0b\u9ad4\uff0c\u6839\u672c\u4e0d\u6392\u968a\uff01<\/strong><\/li>\n
        • \u9019\u6642\u5019\u985e\u5225\u7684\u5efa\u69cb\u5b50\u624d\u57f7\u884c\u5230\u4e00\u534a\uff0c\u4e0b\u65b9\u7684 val itemId<\/code> \u6839\u672c\u9084\u6c92\u88ab\u57f7\u884c\u5230\u3002<\/li>\n
        • \u5728 JVM \u898f\u7bc4\u4e2d\uff0c\u7269\u4ef6\u5206\u914d\u5230 Heap \u4e0a\u6642\uff0c\u539f\u59cb\u578b\u5225\u6703\u5148\u586b\u4e0a\u9810\u8a2d\u4e8c\u9032\u4f4d 0\uff08int<\/code> \u662f 0<\/code>\uff0c\u7269\u4ef6\u662f null<\/code>\uff09\u3002<\/li>\n
        • \u7d50\u679c\uff1a\u4f60\u7684\u5354\u7a0b\u5c31\u5e36\u8457 itemId = 0<\/code> \u53bb\u767c API \u8acb\u6c42\u4e86\uff0c\u76f4\u63a5\u62ff\u932f\u8aa4\u53c3\u6578\u67e5\u8cc7\u6599\u6216\u5f15\u7206\u6e2c\u8a66\u5d29\u6f70\uff01<\/strong><\/li>\n<\/ul>\n
          \n
          \u9806\u4fbf\u63d0\u500b\u96f7\uff1a\u7e7c\u627f\u9ad4\u7cfb\u4e2d\u7236\u985e\u7684 init \u9677\u9631<\/h2>\n
          \u9019\u7a2e\u6642\u5e8f\u554f\u984c\u5728\u7e7c\u627f\u9ad4\u7cfb\u88e1\u66f4\u9670\u96aa\uff1a<\/p>\n
          open<\/span> class<\/span> BaseProcessor<\/span> {\n    init<\/span> {\n        \/\/ \u274c \u7236\u985e\u521d\u59cb\u5316\u6642\uff0c\u8abf\u7528\u4e86\u5b50\u985e\u8986\u5beb\u7684\u5c6c\u6027<\/span>\n        println("Processing buffer size: $bufferSize<\/span>"<\/span>)\n        setupBuffer()\n    }\n    open<\/span> val<\/span> bufferSize: Int<\/span> = 1024<\/span>\n    open<\/span> fun<\/span> setupBuffer<\/span>()<\/span><\/span> {}\n}\n\nclass<\/span> FastProcessor<\/span> : BaseProcessor<\/span>() {\n    \/\/ \u5b50\u985e\u8986\u5beb\u5c6c\u6027<\/span>\n    override<\/span> val<\/span> bufferSize: Int<\/span> = 4096<\/span>\n\n    override<\/span> fun<\/span> setupBuffer<\/span>()<\/span><\/span> {\n        \/\/ \ud83d\udca5 bufferSize \u5728\u9019\u88e1\u7684\u503c\u662f 0\uff01<\/span>\n        \/\/ \u56e0\u70ba\u5b50\u985e\u7684\u6b04\u4f4d\u8ce6\u503c\uff0c\u5728\u7236\u985e\u7684 init \u8dd1\u5b8c\u4e4b\u5f8c\u624d\u8f2a\u5f97\u5230\uff01<\/span>\n        val<\/span> array = ByteArray(bufferSize) \n    }\n}<\/code><\/pre>\n
          \n
          \u90a3\u5230\u5e95\u8a72\u600e\u9ebc\u6539\uff1f\u4e09\u7a2e\u6b63\u7d71\u5beb\u6cd5<\/h2>\n
          \u8981\u5fb9\u5e95\u907f\u958b\u9019\u7a2e\u6642\u5e8f\u9b3c\u6545\u4e8b\uff0c\u6211\u5011\u6709\u4e09\u7a2e\u6539\u6cd5\uff1a<\/p>\n
          \u89e3\u6cd5\u4e00\uff1a\u6700\u7c21\u55ae\u76f4\u89ba\u2014\u2014\u4e56\u4e56\u6309\u9806\u5e8f\u5beb<\/h3>\n
          \u9700\u8981\u88ab\u7528\u5230\u7684\u8b8a\u6578\uff0c\u4e00\u5f8b\u5ba3\u544a\u5728 init<\/code> \u4e4b\u524d<\/strong>\uff1a<\/p>\n
          class<\/span> ItemEditViewModel<\/span>(...) : ViewModel() {\n    \/\/ \u2705 1. \u5148\u5ba3\u544a\u4e26\u8ce6\u503c<\/span>\n    private<\/span> val<\/span> itemId: Int<\/span> = checkNotNull(savedStateHandle["itemId"<\/span>])\n\n    \/\/ \u2705 2. \u5f8c\u9762\u624d\u5728 init \u88e1\u8b80\u5b83<\/span>\n    init<\/span> {\n        viewModelScope.launch {\n            loadItem(itemId)\n        }\n    }\n}<\/code><\/pre>\n
          \u89e3\u6cd5\u4e8c\uff1a\u76f4\u63a5\u653e\u4e3b\u5efa\u69cb\u5b50\uff08\u6700\u4e7e\u6de8\u3001\u63a8\u85a6\uff09<\/h3>\n
          \u5225\u5728\u985e\u5225\u5167\u90e8\u9760\u4e0b\u65b9\u7684\u8b8a\u6578\u627f\u63a5\uff0c\u76f4\u63a5\u5728 Primary Constructor \u89e3\u6c7a\uff1a<\/p>\n
          class<\/span> ItemEditViewModel<\/span>(\n    savedStateHandle: SavedStateHandle,\n    private<\/span> val<\/span> itemsRepository: ItemsRepository,\n    \/\/ \u2705 \u76f4\u63a5\u5728\u5efa\u69cb\u5b50\u53c3\u6578\u5316\uff0cinit \u57f7\u884c\u6642\u5b83\u4e00\u5b9a\u65e9\u5c31\u5099\u59a5\u4e86<\/span>\n    private<\/span> val<\/span> itemId: Int<\/span> = checkNotNull(savedStateHandle["itemId"<\/span>])\n) : ViewModel() {\n    init<\/span> {\n        viewModelScope.launch {\n            loadItem(itemId) \/\/ \u7d55\u5c0d\u5b89\u5168<\/span>\n        }\n    }\n}<\/code><\/pre>\n
          \u89e3\u6cd5\u4e09\uff1a\u6539\u8d70\u97ff\u61c9\u5f0f StateFlow\uff08\u67b6\u69cb\u5c64\u6839\u6cbb\uff09<\/h3>\n
          \u6839\u672c\u4e0d\u8981\u5728 init<\/code> \u88e1\u624b\u52d5 launch\uff0c\u6539\u7528\u73fe\u4ee3\u7684\u5ba3\u544a\u5f0f StateFlow\uff1a<\/p>\n
          class<\/span> ItemEditViewModel<\/span>(\n    savedStateHandle: SavedStateHandle,\n    itemsRepository: ItemsRepository\n) : ViewModel() {\n\n    private<\/span> val<\/span> itemId: Int<\/span> = checkNotNull(savedStateHandle["itemId"<\/span>])\n\n    \/\/ \u2705 \u5ba3\u544a\u5f0f\u51b7\u6d41\u8f49\u63db\uff1a\u5b8c\u5168\u6c92\u6709 init \u5354\u7a0b\u6642\u5e8f\u5148\u5f8c\u7684\u554f\u984c<\/span>\n    val<\/span> uiState: StateFlow<ItemUiState> = itemsRepository.getItemStream(itemId)\n        .filterNotNull()\n        .map { it.toUiState() }\n        .stateIn(\n            scope = viewModelScope,\n            started = SharingStarted.WhileSubscribed(5000<\/span>),\n            initialValue = ItemUiState.Loading\n        )\n}<\/code><\/pre>\n
          \n
          \u7e3d\u7d50\uff1a\u73fe\u5834\u6293\u87f2\u5fc3\u5f97<\/h2>\n
            \n
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          3. \u7269\u4ef6\u521d\u59cb\u5316\u671f\u5c08\u5fc3\u5b9a\u7fa9\u72c0\u614b<\/strong>\uff1a\u80fd\u7528\u5efa\u69cb\u5b50\u50b3\u905e\u5c31\u7528\u5efa\u69cb\u5b50\uff0c\u5c11\u5728 init<\/code> \u88e1\u767c\u8d77\u4f9d\u8cf4\u5167\u90e8\u5c6c\u6027\u7684\u975e\u540c\u6b65\u526f\u4f5c\u7528\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
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