{"id":26851,"date":"2024-03-16T07:27:23","date_gmt":"2024-03-16T07:27:23","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/development-of-the-four-major-android-components-contentprovider\/"},"modified":"2024-03-22T09:35:44","modified_gmt":"2024-03-22T09:35:44","slug":"development-of-the-four-major-android-components-contentprovider","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/development-of-the-four-major-android-components-contentprovider\/","title":{"rendered":"Development of the four major Android components &#8211; ContentProvider."},"content":{"rendered":"<p>ContentProvider is one of the four main components in Android, used for sharing and accessing data. To develop a ContentProvider, the following steps are required:<\/p>\n<ol>\n<li>Create a class that inherits from android.content.ContentProvider.<\/li>\n<li>Declare ContentProvider in the AndroidManifest.xml file.<\/li>\n<li>Implement several important methods in the ContentProvider class, such as onCreate, query, insert, update, and delete methods.<\/li>\n<\/ol>\n<p>Here is a simple example of developing a ContentProvider.<\/p>\n<ol>\n<li>Create a class that inherits from ContentProvider.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyContentProvider<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">ContentProvider<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e00\u4e2a\u6570\u636e\u5e93\u7684\u5e2e\u52a9\u7c7b<\/span>\r\n    <span class=\"hljs-keyword\">private<\/span> DatabaseHelper dbHelper;\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">onCreate<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u6570\u636e\u5e93\u5e2e\u52a9\u7c7b<\/span>\r\n        dbHelper = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatabaseHelper<\/span>(getContext());\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> Cursor <span class=\"hljs-title function_\">query<\/span><span class=\"hljs-params\">(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u67e5\u8be2\u6570\u636e\u5e93\u6570\u636e\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2aCursor\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">SQLiteDatabase<\/span> <span class=\"hljs-variable\">db<\/span> <span class=\"hljs-operator\">=<\/span> dbHelper.getReadableDatabase();\r\n        <span class=\"hljs-type\">Cursor<\/span> <span class=\"hljs-variable\">cursor<\/span> <span class=\"hljs-operator\">=<\/span> db.query(<span class=\"hljs-string\">\"table_name\"<\/span>, projection, selection, selectionArgs, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-literal\">null<\/span>, sortOrder);\r\n        <span class=\"hljs-keyword\">return<\/span> cursor;\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> Uri <span class=\"hljs-title function_\">insert<\/span><span class=\"hljs-params\">(Uri uri, ContentValues values)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u5411\u6570\u636e\u5e93\u63d2\u5165\u6570\u636e\uff0c\u5e76\u8fd4\u56de\u63d2\u5165\u6570\u636e\u7684Uri<\/span>\r\n        <span class=\"hljs-type\">SQLiteDatabase<\/span> <span class=\"hljs-variable\">db<\/span> <span class=\"hljs-operator\">=<\/span> dbHelper.getWritableDatabase();\r\n        <span class=\"hljs-type\">long<\/span> <span class=\"hljs-variable\">id<\/span> <span class=\"hljs-operator\">=<\/span> db.insert(<span class=\"hljs-string\">\"table_name\"<\/span>, <span class=\"hljs-literal\">null<\/span>, values);\r\n        <span class=\"hljs-keyword\">return<\/span> ContentUris.withAppendedId(uri, id);\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">update<\/span><span class=\"hljs-params\">(Uri uri, ContentValues values, String selection, String[] selectionArgs)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u66f4\u65b0\u6570\u636e\u5e93\u6570\u636e\uff0c\u5e76\u8fd4\u56de\u53d7\u5f71\u54cd\u7684\u884c\u6570<\/span>\r\n        <span class=\"hljs-type\">SQLiteDatabase<\/span> <span class=\"hljs-variable\">db<\/span> <span class=\"hljs-operator\">=<\/span> dbHelper.getWritableDatabase();\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> db.update(<span class=\"hljs-string\">\"table_name\"<\/span>, values, selection, selectionArgs);\r\n        <span class=\"hljs-keyword\">return<\/span> count;\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">delete<\/span><span class=\"hljs-params\">(Uri uri, String selection, String[] selectionArgs)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u5220\u9664\u6570\u636e\u5e93\u6570\u636e\uff0c\u5e76\u8fd4\u56de\u53d7\u5f71\u54cd\u7684\u884c\u6570<\/span>\r\n        <span class=\"hljs-type\">SQLiteDatabase<\/span> <span class=\"hljs-variable\">db<\/span> <span class=\"hljs-operator\">=<\/span> dbHelper.getWritableDatabase();\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> db.delete(<span class=\"hljs-string\">\"table_name\"<\/span>, selection, selectionArgs);\r\n        <span class=\"hljs-keyword\">return<\/span> count;\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> String <span class=\"hljs-title function_\">getType<\/span><span class=\"hljs-params\">(Uri uri)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u8fd4\u56de\u6570\u636e\u7684MIME\u7c7b\u578b<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-string\">\"vnd.android.cursor.dir\/vnd.example.data\"<\/span>;\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Declare ContentProvider in AndroidManifest.xml file.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">application<\/span>&gt;<\/span>\r\n    ...\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">provider<\/span>\r\n        <span class=\"hljs-attr\">android:name<\/span>=<span class=\"hljs-string\">\".MyContentProvider\"<\/span>\r\n        <span class=\"hljs-attr\">android:authorities<\/span>=<span class=\"hljs-string\">\"com.example.mycontentprovider\"<\/span>\r\n        <span class=\"hljs-attr\">android:exported<\/span>=<span class=\"hljs-string\">\"true\"<\/span> \/&gt;<\/span>\r\n    ...\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">application<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Using ContentProvider in other components.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u67e5\u8be2\u6570\u636e<\/span>\r\n<span class=\"hljs-type\">Uri<\/span> <span class=\"hljs-variable\">uri<\/span> <span class=\"hljs-operator\">=<\/span> Uri.parse(<span class=\"hljs-string\">\"content:\/\/com.example.mycontentprovider\/table_name\"<\/span>);\r\n<span class=\"hljs-type\">Cursor<\/span> <span class=\"hljs-variable\">cursor<\/span> <span class=\"hljs-operator\">=<\/span> getContentResolver().query(uri, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-literal\">null<\/span>, <span class=\"hljs-literal\">null<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (cursor != <span class=\"hljs-literal\">null<\/span> &amp;&amp; cursor.moveToFirst()) {\r\n    <span class=\"hljs-keyword\">do<\/span> {\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">data<\/span> <span class=\"hljs-operator\">=<\/span> cursor.getString(cursor.getColumnIndex(<span class=\"hljs-string\">\"column_name\"<\/span>));\r\n        <span class=\"hljs-comment\">\/\/ \u5904\u7406\u6570\u636e<\/span>\r\n    } <span class=\"hljs-keyword\">while<\/span> (cursor.moveToNext());\r\n    cursor.close();\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u63d2\u5165\u6570\u636e<\/span>\r\n<span class=\"hljs-type\">Uri<\/span> <span class=\"hljs-variable\">uri<\/span> <span class=\"hljs-operator\">=<\/span> Uri.parse(<span class=\"hljs-string\">\"content:\/\/com.example.mycontentprovider\/table_name\"<\/span>);\r\n<span class=\"hljs-type\">ContentValues<\/span> <span class=\"hljs-variable\">values<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ContentValues<\/span>();\r\nvalues.put(<span class=\"hljs-string\">\"column_name\"<\/span>, <span class=\"hljs-string\">\"value\"<\/span>);\r\n<span class=\"hljs-type\">Uri<\/span> <span class=\"hljs-variable\">newUri<\/span> <span class=\"hljs-operator\">=<\/span> getContentResolver().insert(uri, values);\r\n\r\n<span class=\"hljs-comment\">\/\/ \u66f4\u65b0\u6570\u636e<\/span>\r\n<span class=\"hljs-type\">Uri<\/span> <span class=\"hljs-variable\">uri<\/span> <span class=\"hljs-operator\">=<\/span> Uri.parse(<span class=\"hljs-string\">\"content:\/\/com.example.mycontentprovider\/table_name\"<\/span>);\r\n<span class=\"hljs-type\">ContentValues<\/span> <span class=\"hljs-variable\">values<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ContentValues<\/span>();\r\nvalues.put(<span class=\"hljs-string\">\"column_name\"<\/span>, <span class=\"hljs-string\">\"new value\"<\/span>);\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> getContentResolver().update(uri, values, <span class=\"hljs-string\">\"selection\"<\/span>, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>[]{<span class=\"hljs-string\">\"selectionArgs\"<\/span>});\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5220\u9664\u6570\u636e<\/span>\r\n<span class=\"hljs-type\">Uri<\/span> <span class=\"hljs-variable\">uri<\/span> <span class=\"hljs-operator\">=<\/span> Uri.parse(<span class=\"hljs-string\">\"content:\/\/com.example.mycontentprovider\/table_name\"<\/span>);\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> getContentResolver().delete(uri, <span class=\"hljs-string\">\"selection\"<\/span>, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>[]{<span class=\"hljs-string\">\"selectionArgs\"<\/span>});\r\n<\/code><\/pre>\n<p>Here are the basic steps for using ContentProvider to share and access data. When developing a ContentProvider, it is important to pay attention to setting permissions and the related data operation logic.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ContentProvider is one of the four main components in Android, used for sharing and accessing data. To develop a ContentProvider, the following steps are required: Create a class that inherits from android.content.ContentProvider. Declare ContentProvider in the AndroidManifest.xml file. Implement several important methods in the ContentProvider class, such as onCreate, query, insert, update, and delete methods. [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26851","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Development of the four major Android components - ContentProvider. - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/development-of-the-four-major-android-components-contentprovider\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Development of the four major Android components - ContentProvider.\" \/>\n<meta property=\"og:description\" content=\"ContentProvider is one of the four main components in Android, used for sharing and accessing data. 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