{"id":3874,"date":"2025-06-16T00:00:09","date_gmt":"2025-06-15T16:00:09","guid":{"rendered":"https:\/\/www.wunen.com\/index.php\/2025\/06\/16\/%e5%8a%a0%e5%85%a5%e5%9b%be%e4%b9%a6%e9%a1%b5%e9%9d%a2%e4%bb%a5%e5%8f%8a%e5%92%8c%e5%9b%be%e4%b9%a6%e7%9b%b8%e5%85%b3%e7%9a%84viewmodel%e4%bb%a3%e7%a0%81%ef%bc%8c%e4%bb%a5%e5%8f%8a%e5%92%8c%e9%98%85\/"},"modified":"2025-06-16T00:00:09","modified_gmt":"2025-06-15T16:00:09","slug":"%e5%8a%a0%e5%85%a5%e5%9b%be%e4%b9%a6%e9%a1%b5%e9%9d%a2%e4%bb%a5%e5%8f%8a%e5%92%8c%e5%9b%be%e4%b9%a6%e7%9b%b8%e5%85%b3%e7%9a%84viewmodel%e4%bb%a3%e7%a0%81%ef%bc%8c%e4%bb%a5%e5%8f%8a%e5%92%8c%e9%98%85","status":"publish","type":"post","link":"http:\/\/www.wunen.com\/index.php\/2025\/06\/16\/%e5%8a%a0%e5%85%a5%e5%9b%be%e4%b9%a6%e9%a1%b5%e9%9d%a2%e4%bb%a5%e5%8f%8a%e5%92%8c%e5%9b%be%e4%b9%a6%e7%9b%b8%e5%85%b3%e7%9a%84viewmodel%e4%bb%a3%e7%a0%81%ef%bc%8c%e4%bb%a5%e5%8f%8a%e5%92%8c%e9%98%85\/","title":{"rendered":"\u52a0\u5165\u56fe\u4e66\u9875\u9762\u4ee5\u53ca\u548c\u56fe\u4e66\u76f8\u5173\u7684viewmodel\u4ee3\u7801\uff0c\u4ee5\u53ca\u548c\u9605\u8bfb\u8bb0\u5f55\u76f8\u5173\u7684viewmodel"},"content":{"rendered":"<div class=\"article_content clearfix\" id=\"article_content\">\n <link href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/kdoc_html_views-1a98987dfd.css\" rel=\"stylesheet\"\/>\n <link href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/ck_htmledit_views-704d5b9767.css\" rel=\"stylesheet\"\/>\n<div class=\"markdown_views prism-atom-one-dark\" id=\"content_views\">\n  <svg style=\"display: none;\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n   <path d=\"M5,0 0,2.5 5,5z\" id=\"raphael-marker-block\" stroke-linecap=\"round\" style=\"-webkit-tap-highlight-color: rgba(0, 0, 0, 0);\">\n   <\/path>\n  <\/svg><\/p>\n<h2>\n   <a id=\"1_0\"><br \/>\n   <\/a><br \/>\n   1.\u52a0\u5165\u56fe\u4e66\u9875\u9762<br \/>\n  <\/h2>\n<ol>\n<li>\n    AddBookScreen\uff1a\u8fd9\u662f\u4e00\u4e2a\u7528\u4e8e\u6dfb\u52a0\u4e66\u7c4d\u7684\u5c4f\u5e55\uff0c\u5b83\u63a5\u6536\u4e00\u4e2aNavController\u5bf9\u8c61\u548c\u4e00\u4e2a\u53ef\u9009\u7684modifier\u53c2\u6570\u3002\n   <\/li>\n<\/ol>\n<ul>\n<li>\n    \u5b83\u9996\u5148\u5b9a\u4e49\u4e86\u4e00\u4e2afocusManager\uff0c\u7528\u4e8e\u7ba1\u7406\u952e\u76d8\u64cd\u4f5c\u3002\n   <\/li>\n<li>\n    \u4f7f\u7528mutableStateOf\u521b\u5efa\u4e86\u4e00\u4e2a\u72b6\u6001\u53d8\u91cfsearchText\uff0c\u7528\u4e8e\u5b58\u50a8\u641c\u7d22\u6846\u4e2d\u7684\u6587\u672c\u3002\n   <\/li>\n<\/ul>\n<ol start=\"2\">\n<li>\n<p>\n     Column\uff1a\u4f7f\u7528Column\u6784\u5efa\u4e86\u5c4f\u5e55\u7684\u4e3b\u4f53\u5e03\u5c40\uff0c\u5e76\u8bbe\u7f6e\u4e86\u5185\u8fb9\u8ddd\u3002\n    <\/p>\n<\/li>\n<li>\n<p>\n     Row\uff1a\u5728Column\u4e2d\uff0c\u4f7f\u7528Row\u5e03\u5c40\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u8fd4\u56de\u56fe\u6807\u548c\u641c\u7d22\u6846\u7684\u6c34\u5e73\u5e03\u5c40\u3002\n    <\/p>\n<\/li>\n<\/ol>\n<ul>\n<li>\n    IconButton\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u8fd4\u56de\u56fe\u6807\u6309\u94ae\uff0c\u70b9\u51fb\u65f6\u4f1a\u8c03\u7528navController.popBackStack()\u8fd4\u56de\u4e0a\u4e00\u4e2a\u5bfc\u822a\u76ee\u7684\u5730\u3002\n   <\/li>\n<li>\n    Spacer\uff1a\u5728\u8fd4\u56de\u56fe\u6807\u548c\u641c\u7d22\u6846\u4e4b\u95f4\u6dfb\u52a0\u4e86\u7a7a\u95f4\u3002\n   <\/li>\n<\/ul>\n<ol start=\"4\">\n<li>\n    OutlinedTextField\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5e26\u6709\u8f6e\u5ed3\u7684\u6587\u672c\u5b57\u6bb5\uff0c\u7528\u4e8e\u8f93\u5165\u641c\u7d22\u5185\u5bb9\u3002\n   <\/li>\n<\/ol>\n<ul>\n<li>\n    value\u548conValueChange\u53c2\u6570\u7528\u4e8e\u63a7\u5236\u6587\u672c\u5b57\u6bb5\u7684\u503c\u548c\u66f4\u6539\u65f6\u7684\u56de\u8c03\u3002\n   <\/li>\n<li>\n    label\u63d0\u4f9b\u4e86\u6587\u672c\u5b57\u6bb5\u7684\u6807\u7b7e\uff0c\u6307\u793a\u7528\u6237\u53ef\u4ee5\u641c\u7d22\u4e66\u540d\u6216\u4f5c\u8005\u3002\n   <\/li>\n<li>\n    modifier\u7528\u4e8e\u8bbe\u7f6e\u6587\u672c\u5b57\u6bb5\u7684\u80cc\u666f\u989c\u8272\u548c\u5706\u89d2\u5f62\u72b6\u3002\n   <\/li>\n<li>\n    colors\u53c2\u6570\u81ea\u5b9a\u4e49\u4e86\u6587\u672c\u5b57\u6bb5\u7684\u989c\u8272\uff0c\u5305\u62ec\u5149\u6807\u989c\u8272\u3001\u805a\u7126\u65f6\u7684\u8fb9\u6846\u989c\u8272\u548c\u975e\u805a\u7126\u65f6\u7684\u8fb9\u6846\u989c\u8272\u3002\n   <\/li>\n<li>\n    singleLine\u8bbe\u7f6e\u4e3atrue\uff0c\u8868\u793a\u6587\u672c\u5b57\u6bb5\u4e3a\u5355\u884c\u8f93\u5165\u3002\n   <\/li>\n<li>\n    trailingIcon\u5728\u6587\u672c\u5b57\u6bb5\u7684\u53f3\u4fa7\u663e\u793a\u4e00\u4e2a\u6e05\u9664\u56fe\u6807\uff0c\u5f53\u6587\u672c\u5b57\u6bb5\u4e2d\u6709\u5185\u5bb9\u65f6\u663e\u793a\uff0c\u70b9\u51fb\u53ef\u4ee5\u6e05\u7a7a\u6587\u672c\u5b57\u6bb5\u3002\n   <\/li>\n<li>\n    keyboardActions\u5b9a\u4e49\u4e86\u952e\u76d8\u64cd\u4f5c\uff0c\u5176\u4e2donSearch\u7528\u4e8e\u5904\u7406\u641c\u7d22\u903b\u8f91\uff0c\u540c\u65f6\u9690\u85cf\u952e\u76d8\u3002\n   <\/li>\n<li>\n    keyboardOptions\u8bbe\u7f6e\u4e86\u952e\u76d8\u7684\u8f93\u5165\u6a21\u5f0f\u4e3a\u641c\u7d22\uff0c\u901a\u5e38\u5728\u952e\u76d8\u4e0a\u663e\u793a\u4e00\u4e2a\u641c\u7d22\u6309\u94ae\u3002\n   <\/li>\n<\/ul>\n<p>\n   app\/src\/main\/java\/com\/example\/BookRecord\/AddBooks.kt\uff1a\n  <\/p>\n<pre><code class=\"prism language-kotlin\"><span class=\"token annotation builtin\">@OptIn<\/span><span class=\"token punctuation\">(<\/span>ExperimentalMaterial3Api<span class=\"token operator\">::<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span>\n<span class=\"token annotation builtin\">@Composable<\/span>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">AddBookScreen<\/span><span class=\"token punctuation\">(<\/span>\n    navController<span class=\"token operator\">:<\/span> NavController<span class=\"token punctuation\">,<\/span>\n    modifier<span class=\"token operator\">:<\/span> Modifier <span class=\"token operator\">=<\/span> Modifier<span class=\"token punctuation\">,<\/span>\n<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n    <span class=\"token comment\">\/\/ The focus manager to handle the keyboard actions<\/span>\n    <span class=\"token keyword\">val<\/span> focusManager <span class=\"token operator\">=<\/span> LocalFocusManager<span class=\"token punctuation\">.<\/span>current\n\n    <span class=\"token comment\">\/\/ State for search text<\/span>\n    <span class=\"token keyword\">var<\/span> searchText <span class=\"token keyword\">by<\/span> remember <span class=\"token punctuation\">{<!-- --><\/span> <span class=\"token function\">mutableStateOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"\"<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token function\">Column<\/span><span class=\"token punctuation\">(<\/span>\n        modifier <span class=\"token operator\">=<\/span> modifier\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">padding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">.<\/span>dp<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        <span class=\"token function\">Row<\/span><span class=\"token punctuation\">(<\/span>\n            modifier <span class=\"token operator\">=<\/span> Modifier\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">fillMaxWidth<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n            verticalAlignment <span class=\"token operator\">=<\/span> Alignment<span class=\"token punctuation\">.<\/span>CenterVertically\n        <span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n            <span class=\"token comment\">\/\/ Back icon with a larger touch target for better accessibility<\/span>\n            <span class=\"token function\">IconButton<\/span><span class=\"token punctuation\">(<\/span>\n                onClick <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<!-- --><\/span> navController<span class=\"token punctuation\">.<\/span><span class=\"token function\">popBackStack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span>\n                modifier <span class=\"token operator\">=<\/span> Modifier<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">35<\/span><span class=\"token punctuation\">.<\/span>dp<span class=\"token punctuation\">)<\/span>\n            <span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n                <span class=\"token function\">Icon<\/span><span class=\"token punctuation\">(<\/span>\n                    imageVector <span class=\"token operator\">=<\/span> Icons<span class=\"token punctuation\">.<\/span>Filled<span class=\"token punctuation\">.<\/span>ArrowBack<span class=\"token punctuation\">,<\/span>\n                    contentDescription <span class=\"token operator\">=<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">\"Back\"<\/span><\/span><span class=\"token punctuation\">,<\/span>\n                    tint <span class=\"token operator\">=<\/span> <span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFF6650a4<\/span><span class=\"token punctuation\">)<\/span>\n                <span class=\"token punctuation\">)<\/span>\n            <span class=\"token punctuation\">}<\/span>\n\n            <span class=\"token function\">Spacer<\/span><span class=\"token punctuation\">(<\/span>modifier <span class=\"token operator\">=<\/span> Modifier<span class=\"token punctuation\">.<\/span><span class=\"token function\">width<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">.<\/span>dp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ Add space between the icon and the search bar<\/span>\n\n            <span class=\"token comment\">\/\/ Search input field<\/span>\n            <span class=\"token function\">OutlinedTextField<\/span><span class=\"token punctuation\">(<\/span>\n                value <span class=\"token operator\">=<\/span> searchText<span class=\"token punctuation\">,<\/span>\n                onValueChange <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<!-- --><\/span> searchText <span class=\"token operator\">=<\/span> it <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span>\n                label <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<!-- --><\/span> <span class=\"token function\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"Search by title, author\"<\/span><\/span><span class=\"token punctuation\">,<\/span> color <span class=\"token operator\">=<\/span> <span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFF6650a4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span>\n                modifier <span class=\"token operator\">=<\/span> Modifier\n                    <span class=\"token punctuation\">.<\/span><span class=\"token function\">fillMaxWidth<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n                    <span class=\"token punctuation\">.<\/span><span class=\"token function\">background<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFFF2F2F2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">RoundedCornerShape<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">.<\/span>dp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u76f4\u63a5\u5728\u8fd9\u91cc\u8bbe\u7f6e\u80cc\u666f\u989c\u8272\u548c\u5f62\u72b6<\/span>\n                shape <span class=\"token operator\">=<\/span> <span class=\"token function\">RoundedCornerShape<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">.<\/span>dp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u8f93\u5165\u6846\u7684\u5f62\u72b6<\/span>\n                colors <span class=\"token operator\">=<\/span> TextFieldDefaults<span class=\"token punctuation\">.<\/span><span class=\"token function\">outlinedTextFieldColors<\/span><span class=\"token punctuation\">(<\/span>\n<span class=\"token comment\">\/\/                    backgroundColor = Color(0xFFF2F2F2),<\/span>\n                    cursorColor <span class=\"token operator\">=<\/span> <span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFF6650a4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n                    focusedBorderColor <span class=\"token operator\">=<\/span> <span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFF6650a4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n                    unfocusedBorderColor <span class=\"token operator\">=<\/span> <span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFF6650a4<\/span><span class=\"token punctuation\">)<\/span>\n                <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n                singleLine <span class=\"token operator\">=<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span>\n                trailingIcon <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>searchText<span class=\"token punctuation\">.<\/span><span class=\"token function\">isNotEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n                        <span class=\"token function\">IconButton<\/span><span class=\"token punctuation\">(<\/span>onClick <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<!-- --><\/span> searchText <span class=\"token operator\">=<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">\"\"<\/span><\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n                            <span class=\"token function\">Icon<\/span><span class=\"token punctuation\">(<\/span>\n                                imageVector <span class=\"token operator\">=<\/span> Icons<span class=\"token punctuation\">.<\/span>Filled<span class=\"token punctuation\">.<\/span>Clear<span class=\"token punctuation\">,<\/span>\n                                contentDescription <span class=\"token operator\">=<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">\"Clear\"<\/span><\/span><span class=\"token punctuation\">,<\/span>\n                                tint <span class=\"token operator\">=<\/span> <span class=\"token function\">Color<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0xFF6650a4<\/span><span class=\"token punctuation\">)<\/span>\n                            <span class=\"token punctuation\">)<\/span>\n                        <span class=\"token punctuation\">}<\/span>\n                    <span class=\"token punctuation\">}<\/span>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span>\n                keyboardActions <span class=\"token operator\">=<\/span> <span class=\"token function\">KeyboardActions<\/span><span class=\"token punctuation\">(<\/span>\n                    onSearch <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n                        focusManager<span class=\"token punctuation\">.<\/span><span class=\"token function\">clearFocus<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ Hide the keyboard<\/span>\n                        <span class=\"token comment\">\/\/ TODO: Implement the search logic here<\/span>\n                    <span class=\"token punctuation\">}<\/span>\n                <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>\n                keyboardOptions <span class=\"token operator\">=<\/span> KeyboardOptions<span class=\"token punctuation\">.<\/span>Default<span class=\"token punctuation\">.<\/span><span class=\"token function\">copy<\/span><span class=\"token punctuation\">(<\/span>imeAction <span class=\"token operator\">=<\/span> ImeAction<span class=\"token punctuation\">.<\/span>Search<span class=\"token punctuation\">)<\/span>\n            <span class=\"token punctuation\">)<\/span>\n        <span class=\"token punctuation\">}<\/span>\n\n        <span class=\"token comment\">\/\/ TODO: Add the rest of your UI components here<\/span>\n    <span class=\"token punctuation\">}<\/span>\n<span class=\"token punctuation\">}<\/span>\n\n<\/code><\/pre>\n<h2>\n   <a id=\"2_BookViewModel_102\"><br \/>\n   <\/a><br \/>\n   2. BookViewModel<br \/>\n  <\/h2>\n<ol>\n<li>\n<p>\n     BookStatus\u679a\u4e3e\uff1a\u5b9a\u4e49\u4e86\u4e66\u7c4d\u7684\u4e09\u79cd\u72b6\u6001\uff0c\u5206\u522b\u662f\u6b63\u5728\u9605\u8bfb\uff08READING\uff09\u3001\u5df2\u9605\u8bfb\uff08READ\uff09\u548c\u6401\u7f6e\uff08ON_HOLD\uff09\u3002\n    <\/p>\n<\/li>\n<li>\n<p>\n     BookViewModel\u7c7b\uff1a\u8fd9\u662f\u4e00\u4e2a\u7ee7\u627f\u81eaAndroidViewModel\u7684\u89c6\u56fe\u6a21\u578b\u7c7b\uff0c\u7528\u4e8e\u7ba1\u7406\u548c\u5b58\u50a8\u4e66\u7c4d\u6570\u636e\u3002\n    <\/p>\n<\/li>\n<\/ol>\n<ul>\n<li>\n    \u7c7b\u7684\u521d\u59cb\u5316\u5757\u4e2d\uff0c\u901a\u8fc7\u4f20\u5165\u7684Application\u5bf9\u8c61\u83b7\u53d6\u4e86\u6570\u636e\u5e93\u7684\u8bbf\u95ee\u5bf9\u8c61bookDao\u548cnoteDao\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u7528\u4e8e\u4e0e\u6570\u636e\u5e93\u8fdb\u884c\u4ea4\u4e92\u3002\n   <\/li>\n<li>\n    bookRepository\u548cnoteRepository\u662f\u7528\u4e8e\u6570\u636e\u64cd\u4f5c\u7684\u4ed3\u5e93\u7c7b\u5b9e\u4f8b\uff0c\u5b83\u4eec\u5c01\u88c5\u4e86\u5bf9\u6570\u636e\u5e93\u7684\u76f4\u63a5\u8bbf\u95ee\u3002\n   <\/li>\n<li>\n    currentUserUID\u5b58\u50a8\u4e86\u5f53\u524d\u767b\u5f55\u7528\u6237\u7684\u7528\u6237ID\uff0c\u7528\u4e8e\u5c06\u4e66\u7c4d\u4e0e\u7528\u6237\u5173\u8054\u3002\n   <\/li>\n<li>\n    allBooks\u662f\u4e00\u4e2aLiveData\u5bf9\u8c61\uff0c\u7528\u4e8e\u89c2\u5bdf\u6240\u6709\u4e66\u7c4d\u7684\u6570\u636e\u53d8\u5316\u3002\n   <\/li>\n<li>\n    bookCounts\u662f\u4e00\u4e2aMutableLiveData\u5bf9\u8c61\uff0c\u7528\u4e8e\u5b58\u50a8\u548c\u66f4\u65b0\u4e66\u7c4d\u72b6\u6001\u7684\u8ba1\u6570\u3002\n   <\/li>\n<li>\n    readingBooks\u3001completeBooks\u548clayasideBooks\u662fMediatorLiveData\u5bf9\u8c61\uff0c\u5b83\u4eec\u6839\u636e\u4e66\u7c4d\u7684\u72b6\u6001\u8fc7\u6ee4allBooks\u4e2d\u7684\u6570\u636e\u3002\n   <\/li>\n<li>\n    \u5728\u521d\u59cb\u5316\u5757\u4e2d\uff0c\u8bbe\u7f6e\u4e86MediatorLiveData\u7684\u6e90\u4e3aallBooks\uff0c\u5e76\u6839\u636e\u4e66\u7c4d\u7684\u4e0d\u540c\u72b6\u6001\u66f4\u65b0\u8fd9\u4e9bLiveData\u5bf9\u8c61\u3002\n   <\/li>\n<li>\n    updateBookCounts\u65b9\u6cd5\u7528\u4e8e\u66f4\u65b0\u4e66\u7c4d\u72b6\u6001\u7684\u8ba1\u6570\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728bookCounts\u4e2d\u3002\n   <\/li>\n<li>\n    addBook\u65b9\u6cd5\u7528\u4e8e\u6dfb\u52a0\u65b0\u4e66\u7c4d\u5230\u6570\u636e\u5e93\u4e2d\u3002\n   <\/li>\n<li>\n    deleteBook\u65b9\u6cd5\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u4e2d\u5220\u9664\u4e66\u7c4d\u3002\n   <\/li>\n<li>\n    updateBookStatus\u65b9\u6cd5\u7528\u4e8e\u66f4\u65b0\u4e66\u7c4d\u7684\u72b6\u6001\u3002\n   <\/li>\n<li>\n    updateBookReadPage\u65b9\u6cd5\u7528\u4e8e\u66f4\u65b0\u4e66\u7c4d\u7684\u5df2\u9605\u8bfb\u9875\u6570\u3002\n   <\/li>\n<li>\n    getNoteCountByBookId\u65b9\u6cd5\u7528\u4e8e\u83b7\u53d6\u6307\u5b9a\u4e66\u7c4d\u7684\u7b14\u8bb0\u6570\u91cf\u3002\n   <\/li>\n<\/ul>\n<p>\n   app\/src\/main\/java\/com\/example\/BookRecord\/BookViewModel.kt\uff1a\n  <\/p>\n<pre><code class=\"prism language-kotlin\"><span class=\"token keyword\">enum<\/span> <span class=\"token keyword\">class<\/span> BookStatus <span class=\"token punctuation\">{<!-- --><\/span>\n    READING<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u6b63\u5728\u9605\u8bfb<\/span>\n    READ<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u5df2\u9605\u8bfb<\/span>\n    ON_HOLD <span class=\"token comment\">\/\/ \u6401\u7f6e<\/span>\n<span class=\"token punctuation\">}<\/span>\n\n<span class=\"token comment\">\/\/\u5728\u7c7b\u7684\u521d\u59cb\u5316\u5757\u4e2d\uff0c\u901a\u8fc7\u4f20\u5165\u5e94\u7528\u7a0b\u5e8f\u7684 Application \u5bf9\u8c61\uff0c\u83b7\u53d6\u4e86\u6570\u636e\u5e93\u7684\u8bbf\u95ee\u5bf9\u8c61 bookDao \u548c noteDao<\/span>\n<span class=\"token keyword\">class<\/span> <span class=\"token function\">BookViewModel<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token operator\">:<\/span> Application<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">AndroidViewModel<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> bookDao <span class=\"token operator\">=<\/span> AppDatabase<span class=\"token punctuation\">.<\/span><span class=\"token function\">getDatabase<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">bookDao<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> noteDao <span class=\"token operator\">=<\/span> AppDatabase<span class=\"token punctuation\">.<\/span><span class=\"token function\">getDatabase<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">noteDao<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> bookRepository <span class=\"token operator\">=<\/span> <span class=\"token function\">BookRepository<\/span><span class=\"token punctuation\">(<\/span>bookDao<span class=\"token punctuation\">,<\/span> viewModelScope<span class=\"token punctuation\">)<\/span>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> noteRepository <span class=\"token operator\">=<\/span> <span class=\"token function\">NoteRepository<\/span><span class=\"token punctuation\">(<\/span>noteDao<span class=\"token punctuation\">)<\/span>\n\n\n    <span class=\"token keyword\">var<\/span> currentUserUID <span class=\"token operator\">=<\/span> FirebaseAuth<span class=\"token punctuation\">.<\/span><span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>currentUser<span class=\"token operator\">?<\/span><span class=\"token punctuation\">.<\/span>uid\n\n    <span class=\"token keyword\">val<\/span> allBooks<span class=\"token operator\">:<\/span> LiveData<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>Book<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">=<\/span> bookRepository<span class=\"token punctuation\">.<\/span>allBooks\n    <span class=\"token keyword\">val<\/span> bookCounts <span class=\"token operator\">=<\/span> MutableLiveData<span class=\"token operator\">&lt;<\/span>Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Int<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n\n    <span class=\"token comment\">\/\/ \u4f7f\u7528 MediatorLiveData \u66ff\u4ee3 Transformations.map<\/span>\n    <span class=\"token keyword\">val<\/span> readingBooks <span class=\"token operator\">=<\/span> MediatorLiveData<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>Book<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token keyword\">val<\/span> completeBooks <span class=\"token operator\">=<\/span> MediatorLiveData<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>Book<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token keyword\">val<\/span> layasideBooks <span class=\"token operator\">=<\/span> MediatorLiveData<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>Book<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n\n    <span class=\"token keyword\">init<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        readingBooks<span class=\"token punctuation\">.<\/span><span class=\"token function\">addSource<\/span><span class=\"token punctuation\">(<\/span>allBooks<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span> books <span class=\"token operator\">-&gt;<\/span>\n            readingBooks<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">=<\/span> books<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span> <span class=\"token punctuation\">{<!-- --><\/span> it<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">==<\/span> BookStatus<span class=\"token punctuation\">.<\/span>READING <span class=\"token punctuation\">}<\/span>\n        <span class=\"token punctuation\">}<\/span>\n\n        completeBooks<span class=\"token punctuation\">.<\/span><span class=\"token function\">addSource<\/span><span class=\"token punctuation\">(<\/span>allBooks<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span> books <span class=\"token operator\">-&gt;<\/span>\n            completeBooks<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">=<\/span> books<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span> <span class=\"token punctuation\">{<!-- --><\/span> it<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">==<\/span> BookStatus<span class=\"token punctuation\">.<\/span>READ <span class=\"token punctuation\">}<\/span>\n        <span class=\"token punctuation\">}<\/span>\n\n        layasideBooks<span class=\"token punctuation\">.<\/span><span class=\"token function\">addSource<\/span><span class=\"token punctuation\">(<\/span>allBooks<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span> books <span class=\"token operator\">-&gt;<\/span>\n            layasideBooks<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">=<\/span> books<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span> <span class=\"token punctuation\">{<!-- --><\/span> it<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">==<\/span> BookStatus<span class=\"token punctuation\">.<\/span>ON_HOLD <span class=\"token punctuation\">}<\/span>\n        <span class=\"token punctuation\">}<\/span>\n        <span class=\"token comment\">\/\/ Update book counts<\/span>\n        <span class=\"token function\">updateBookCounts<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">updateBookCounts<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        <span class=\"token keyword\">val<\/span> counts <span class=\"token operator\">=<\/span> <span class=\"token function\">mutableMapOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"have read\"<\/span><\/span> <span class=\"token keyword\">to<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">\"lay aside\"<\/span><\/span> <span class=\"token keyword\">to<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">\"reading\"<\/span><\/span> <span class=\"token keyword\">to<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>\n        allBooks<span class=\"token punctuation\">.<\/span><span class=\"token function\">observeForever<\/span> <span class=\"token punctuation\">{<!-- --><\/span> books <span class=\"token operator\">-&gt;<\/span>\n            counts<span class=\"token punctuation\">[<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"have read\"<\/span><\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">=<\/span> books<span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span> <span class=\"token punctuation\">{<!-- --><\/span> it<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">==<\/span> BookStatus<span class=\"token punctuation\">.<\/span>READ <span class=\"token punctuation\">}<\/span>\n            counts<span class=\"token punctuation\">[<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"lay aside\"<\/span><\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">=<\/span> books<span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span> <span class=\"token punctuation\">{<!-- --><\/span> it<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">==<\/span> BookStatus<span class=\"token punctuation\">.<\/span>ON_HOLD <span class=\"token punctuation\">}<\/span>\n            counts<span class=\"token punctuation\">[<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"reading\"<\/span><\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">=<\/span> books<span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span> <span class=\"token punctuation\">{<!-- --><\/span> it<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">==<\/span> BookStatus<span class=\"token punctuation\">.<\/span>READING <span class=\"token punctuation\">}<\/span>\n            bookCounts<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">=<\/span> counts\n        <span class=\"token punctuation\">}<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token comment\">\/\/ \u6dfb\u52a0\u65b0\u4e66\u7c4d<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">addBook<\/span><span class=\"token punctuation\">(<\/span>bookTitle<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> bookImage<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> author<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> pages<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> status<span class=\"token operator\">:<\/span> BookStatus<span class=\"token punctuation\">,<\/span> readPage<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> press<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span>startTime<span class=\"token operator\">:<\/span> LocalDate<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> viewModelScope<span class=\"token punctuation\">.<\/span><span class=\"token function\">launch<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        <span class=\"token keyword\">val<\/span> newBook <span class=\"token operator\">=<\/span> <span class=\"token function\">Book<\/span><span class=\"token punctuation\">(<\/span>\n            userId <span class=\"token operator\">=<\/span> currentUserUID <span class=\"token operator\">?:<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">\"\"<\/span><\/span><span class=\"token punctuation\">,<\/span><span class=\"token comment\">\/\/\u786e\u4fdd\u4e0d\u4f1a\u7a7a\uff0c\u5904\u7406\u672a\u767b\u9646\u7684\u60c5\u51b5<\/span>\n            title <span class=\"token operator\">=<\/span> bookTitle<span class=\"token punctuation\">,<\/span>\n            image <span class=\"token operator\">=<\/span> bookImage<span class=\"token punctuation\">,<\/span>\n            author <span class=\"token operator\">=<\/span> author<span class=\"token punctuation\">,<\/span>\n            pages <span class=\"token operator\">=<\/span> pages<span class=\"token punctuation\">,<\/span>\n            status <span class=\"token operator\">=<\/span> status<span class=\"token punctuation\">,<\/span>\n            readpage <span class=\"token operator\">=<\/span> readPage<span class=\"token punctuation\">,<\/span>\n            press <span class=\"token operator\">=<\/span> press<span class=\"token punctuation\">,<\/span>\n            startTime <span class=\"token operator\">=<\/span> startTime <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5f53\u524d\u65e5\u671f\u4e3a\u5f00\u59cb\u65f6\u95f4<\/span>\n        <span class=\"token punctuation\">)<\/span>\n        bookRepository<span class=\"token punctuation\">.<\/span><span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>newBook<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token comment\">\/\/ \u5220\u9664\u4e66\u7c4d<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">deleteBook<\/span><span class=\"token punctuation\">(<\/span>book<span class=\"token operator\">:<\/span> Book<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> viewModelScope<span class=\"token punctuation\">.<\/span><span class=\"token function\">launch<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        bookRepository<span class=\"token punctuation\">.<\/span><span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span>book<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token comment\">\/\/ \u66f4\u65b0\u4e66\u7c4d\u72b6\u6001<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">updateBookStatus<\/span><span class=\"token punctuation\">(<\/span>book<span class=\"token operator\">:<\/span> Book<span class=\"token punctuation\">,<\/span> newStatus<span class=\"token operator\">:<\/span> BookStatus<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> viewModelScope<span class=\"token punctuation\">.<\/span><span class=\"token function\">launch<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        book<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">=<\/span> newStatus\n        bookRepository<span class=\"token punctuation\">.<\/span><span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span>book<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token comment\">\/\/ \u66f4\u65b0\u5df2\u9605\u8bfb\u9875\u6570<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">updateBookReadPage<\/span><span class=\"token punctuation\">(<\/span>book<span class=\"token operator\">:<\/span> Book<span class=\"token punctuation\">,<\/span> readPage<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> viewModelScope<span class=\"token punctuation\">.<\/span><span class=\"token function\">launch<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        book<span class=\"token punctuation\">.<\/span>readpage <span class=\"token operator\">=<\/span> readPage <span class=\"token comment\">\/\/ \u786e\u4fdd\u5c5e\u6027\u540d\u79f0\u4e0e\u4f60\u7684 Book \u7c7b\u4e00\u81f4<\/span>\n        bookRepository<span class=\"token punctuation\">.<\/span><span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span>book<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token comment\">\/\/ \u83b7\u53d6\u6307\u5b9a\u4e66\u7c4d\u7684\u7b14\u8bb0\u6570\u91cf<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">getNoteCountByBookId<\/span><span class=\"token punctuation\">(<\/span>bookId<span class=\"token operator\">:<\/span> Int<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> LiveData<span class=\"token operator\">&lt;<\/span>Int<span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        <span class=\"token keyword\">return<\/span> noteRepository<span class=\"token punctuation\">.<\/span><span class=\"token function\">getNoteCountByBookId<\/span><span class=\"token punctuation\">(<\/span>bookId<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n<span class=\"token punctuation\">}<\/span>\n\n<\/code><\/pre>\n<h2>\n   <a id=\"3_ReadingRecordViewModel_216\"><br \/>\n   <\/a><br \/>\n   3. ReadingRecordViewModel<br \/>\n  <\/h2>\n<p>\n   \u7528\u4e8e\u7ba1\u7406\u4e0e\u9605\u8bfb\u8bb0\u5f55\u76f8\u5173\u7684\u6570\u636e\u548c\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4ee3\u7801\u7684\u4e3b\u8981\u7ec4\u6210\u90e8\u5206\u548c\u529f\u80fd\uff1a\n  <\/p>\n<ol>\n<li>\n<p>\n     \u6784\u9020\u51fd\u6570\uff1a\u63a5\u6536\u4e00\u4e2a Application \u5bf9\u8c61\uff0c\u5e76\u5728\u521d\u59cb\u5316\u5757\u4e2d\u521b\u5efa ReadingRecordRepository \u5b9e\u4f8b\u3002ReadingRecordRepository \u7528\u4e8e\u8bbf\u95ee\u6570\u636e\u5e93\u548c\u6267\u884c\u6570\u636e\u5e93\u64cd\u4f5c\u3002\n    <\/p>\n<\/li>\n<li>\n<p>\n     \u6570\u636e\u5e93\u8bbf\u95ee\uff1a\u901a\u8fc7 AppDatabase.getDatabase(application) \u83b7\u53d6\u6570\u636e\u5e93\u5b9e\u4f8b\uff0c\u7136\u540e\u901a\u8fc7 ReadingRecordDao() \u65b9\u6cd5\u83b7\u53d6 ReadingRecordDao \u5b9e\u4f8b\uff0c\u8fd9\u662f\u4e0e\u9605\u8bfb\u8bb0\u5f55\u8868\u4ea4\u4e92\u7684\u63a5\u53e3\u3002\n    <\/p>\n<\/li>\n<li>\n<p>\n     LiveData \u5c5e\u6027\uff1a\n    <\/p>\n<\/li>\n<\/ol>\n<ul>\n<li>\n    readPagesLast7Days\uff1a\u4e00\u4e2a LiveData&lt;List&lt;ReadingRecordDao.DailyReading&gt;&gt; \u5c5e\u6027\uff0c\u7528\u4e8e\u4fdd\u5b58\u6700\u8fd17\u5929\u7684\u6bcf\u5929\u9605\u8bfb\u8bb0\u5f55\u3002\n   <\/li>\n<li>\n    readPagesLast15Days\uff1a\u4e00\u4e2a LiveData&lt;List&lt;ReadingRecordDao.DailyReading&gt;&gt; \u5c5e\u6027\uff0c\u7528\u4e8e\u4fdd\u5b58\u6700\u8fd115\u5929\u7684\u6bcf\u5929\u9605\u8bfb\u8bb0\u5f55\u3002\n   <\/li>\n<\/ul>\n<ol start=\"4\">\n<li>\n<p>\n     \u521d\u59cb\u5316 LiveData\uff1a\u5728\u521d\u59cb\u5316\u5757\u4e2d\uff0c\u4f7f\u7528\u5f53\u524d\u65e5\u671f\u548c\u8fc7\u53bb\u65e5\u671f\u6765\u8ba1\u7b97\u65f6\u95f4\u8303\u56f4\uff0c\u5e76\u8c03\u7528 repository \u7684 getPagesReadPerDay \u65b9\u6cd5\u6765\u83b7\u53d6\u8fc7\u53bb7\u5929\u548c\u8fc7\u53bb15\u5929\u7684\u6bcf\u5929\u9605\u8bfb\u9875\u6570\u3002\n    <\/p>\n<\/li>\n<li>\n<p>\n     \u63d2\u5165\u9605\u8bfb\u8bb0\u5f55\uff1ainsertReadingRecord \u51fd\u6570\u63a5\u6536\u4e00\u4e2a ReadingRecord \u5bf9\u8c61\uff0c\u7136\u540e\u5728\u534f\u7a0b\u4f5c\u7528\u57df\u5185\u8c03\u7528 repository.insertReadingRecord \u65b9\u6cd5\u5c06\u65b0\u7684\u9605\u8bfb\u8bb0\u5f55\u63d2\u5165\u6570\u636e\u5e93\u3002\n    <\/p>\n<\/li>\n<li>\n<p>\n     \u534f\u7a0b\u5904\u7406\uff1a\u4f7f\u7528 viewModelScope.launch \u5728 ViewModel \u7684\u4f5c\u7528\u57df\u5185\u542f\u52a8\u534f\u7a0b\uff0c\u4ee5\u4fbf\u5728\u540e\u53f0\u7ebf\u7a0b\u4e0a\u6267\u884c\u6570\u636e\u5e93\u64cd\u4f5c\u3002\n    <\/p>\n<\/li>\n<\/ol>\n<p>\n   app\/src\/main\/java\/com\/example\/BookRecord\/ReadingRecordViewModel.kt\n  <\/p>\n<pre><code class=\"prism language-kotlin\"><span class=\"token keyword\">package<\/span> com<span class=\"token punctuation\">.<\/span>example<span class=\"token punctuation\">.<\/span>BookRecord\n<span class=\"token keyword\">import<\/span> android<span class=\"token punctuation\">.<\/span>app<span class=\"token punctuation\">.<\/span>Application\n<span class=\"token keyword\">import<\/span> androidx<span class=\"token punctuation\">.<\/span>lifecycle<span class=\"token punctuation\">.<\/span>AndroidViewModel\n<span class=\"token keyword\">import<\/span> androidx<span class=\"token punctuation\">.<\/span>lifecycle<span class=\"token punctuation\">.<\/span>LiveData\n<span class=\"token keyword\">import<\/span> androidx<span class=\"token punctuation\">.<\/span>lifecycle<span class=\"token punctuation\">.<\/span>MutableLiveData\n<span class=\"token keyword\">import<\/span> androidx<span class=\"token punctuation\">.<\/span>lifecycle<span class=\"token punctuation\">.<\/span>viewModelScope\n<span class=\"token keyword\">import<\/span> kotlinx<span class=\"token punctuation\">.<\/span>coroutines<span class=\"token punctuation\">.<\/span>launch\n<span class=\"token keyword\">import<\/span> org<span class=\"token punctuation\">.<\/span>threeten<span class=\"token punctuation\">.<\/span>bp<span class=\"token punctuation\">.<\/span>LocalDate\n\n<span class=\"token keyword\">class<\/span> <span class=\"token function\">ReadingRecordViewModel<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token operator\">:<\/span> Application<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">AndroidViewModel<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6\u5bf9\u5e94\u7684Repository\u5b9e\u4f8b<\/span>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> repository<span class=\"token operator\">:<\/span> ReadingRecordRepository\n\n    <span class=\"token comment\">\/\/ LiveData\u4fdd\u5b58\u6700\u8fd17\u5929\u548c\u6700\u8fd115\u5929\u7684\u6bcf\u5929\u9605\u8bfb\u8bb0\u5f55<\/span>\n    <span class=\"token keyword\">val<\/span> readPagesLast7Days<span class=\"token operator\">:<\/span> LiveData<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>ReadingRecordDao<span class=\"token punctuation\">.<\/span>DailyReading<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span>\n    <span class=\"token keyword\">val<\/span> readPagesLast15Days<span class=\"token operator\">:<\/span> LiveData<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>ReadingRecordDao<span class=\"token punctuation\">.<\/span>DailyReading<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span>\n\n\n    <span class=\"token keyword\">init<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316repository\u548cLiveData<\/span>\n        <span class=\"token keyword\">val<\/span> appDatabase <span class=\"token operator\">=<\/span> AppDatabase<span class=\"token punctuation\">.<\/span><span class=\"token function\">getDatabase<\/span><span class=\"token punctuation\">(<\/span>application<span class=\"token punctuation\">)<\/span>\n        <span class=\"token keyword\">val<\/span> readingRecordDao <span class=\"token operator\">=<\/span> appDatabase<span class=\"token punctuation\">.<\/span><span class=\"token function\">ReadingRecordDao<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n        repository <span class=\"token operator\">=<\/span> <span class=\"token function\">ReadingRecordRepository<\/span><span class=\"token punctuation\">(<\/span>readingRecordDao<span class=\"token punctuation\">)<\/span>\n\n        <span class=\"token keyword\">val<\/span> today <span class=\"token operator\">=<\/span> LocalDate<span class=\"token punctuation\">.<\/span><span class=\"token function\">now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n        <span class=\"token keyword\">val<\/span> eightDaysAgo <span class=\"token operator\">=<\/span> today<span class=\"token punctuation\">.<\/span><span class=\"token function\">minusDays<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u6536\u96c68\u5929\u6570\u636e\u4ee5\u8ba1\u7b977\u5929\u7684\u589e\u91cf<\/span>\n        <span class=\"token keyword\">val<\/span> sixteenDaysAgo <span class=\"token operator\">=<\/span> today<span class=\"token punctuation\">.<\/span><span class=\"token function\">minusDays<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">14<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u6536\u96c616\u5929\u6570\u636e\u4ee5\u8ba1\u7b9715\u5929\u7684\u589e\u91cf<\/span>\n\n        <span class=\"token comment\">\/\/ \u83b7\u53d6\u8fc7\u53bb7\u5929\u548c\u8fc7\u53bb15\u5929\u7684\u6bcf\u5929\u7684\u9605\u8bfb\u9875\u6570<\/span>\n        readPagesLast7Days <span class=\"token operator\">=<\/span> repository<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPagesReadPerDay<\/span><span class=\"token punctuation\">(<\/span>eightDaysAgo<span class=\"token punctuation\">,<\/span> today<span class=\"token punctuation\">)<\/span>\n        readPagesLast15Days <span class=\"token operator\">=<\/span> repository<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPagesReadPerDay<\/span><span class=\"token punctuation\">(<\/span>sixteenDaysAgo<span class=\"token punctuation\">,<\/span> today<span class=\"token punctuation\">)<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n     <span class=\"token comment\">\/\/\u63d2\u5165\u9605\u8bfb\u8bb0\u5f55\u7684\u65b9\u6cd5<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">insertReadingRecord<\/span><span class=\"token punctuation\">(<\/span>readingRecord<span class=\"token operator\">:<\/span> ReadingRecord<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n        viewModelScope<span class=\"token punctuation\">.<\/span><span class=\"token function\">launch<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n            repository<span class=\"token punctuation\">.<\/span><span class=\"token function\">insertReadingRecord<\/span><span class=\"token punctuation\">(<\/span>readingRecord<span class=\"token punctuation\">)<\/span>\n        <span class=\"token punctuation\">}<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n\n<span class=\"token punctuation\">}<\/span>\n<\/code><\/pre>\n<h2>\n   <a id=\"ps_281\"><br \/>\n   <\/a><br \/>\n   ps<br \/>\n  <\/h2>\n<p>\n   app\u7684\u6700\u7ec8\u9875\u9762\u89c1\u548c\u8be5\u6587\u7ae0\u540c\u4e00\u4e13\u680f\u4e0b\u7684\u535a\u6587\uff1a<br \/>\n   <a href=\"https:\/\/blog.csdn.net\/weixin_47505105\/article\/details\/141112863\"><br \/>\n    \u5b89\u5353\u5f00\u53d1\uff1aBookRecord\u4e00\u6b3e\u4e13\u4e3a\u7eb8\u8d28\u4e66\u7231\u597d\u8005\u8bbe\u8ba1\u7684\u9605\u8bfb\u8ffd\u8e2a\u5e94\u7528<br \/>\n   <\/a>\n  <\/p>\n<\/p><\/div>\n<link href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/markdown_views-a5d25dd831.css\" rel=\"stylesheet\"\/>\n <link href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/style-e504d6a974.css\" rel=\"stylesheet\"\/>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1.\u52a0\u5165\u56fe\u4e66\u9875\u9762 AddBookScreen\uff1a\u8fd9\u662f\u4e00\u4e2a\u7528\u4e8e\u6dfb\u52a0\u4e66\u7c4d\u7684\u5c4f\u5e55\uff0c\u5b83\u63a5\u6536\u4e00\u4e2aNavController [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":215,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-3874","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-17"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u52a0\u5165\u56fe\u4e66\u9875\u9762\u4ee5\u53ca\u548c\u56fe\u4e66\u76f8\u5173\u7684viewmodel\u4ee3\u7801\uff0c\u4ee5\u53ca\u548c\u9605\u8bfb\u8bb0\u5f55\u76f8\u5173\u7684viewmodel - \u7269\u5ae9\u8f6f\u4ef6\u8d44\u8baf\u7f51<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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