{"id":58425,"date":"2024-10-12T20:34:16","date_gmt":"2024-10-12T12:34:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/58425\/"},"modified":"2024-10-12T20:34:16","modified_gmt":"2024-10-12T12:34:16","slug":"android%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%b7%e7%b6%b2%e7%b5%a1%e9%80%a3%e6%8e%a5%e4%b8%a6%e9%80%a3%e6%8e%a5%e6%95%b8%e6%93%9a%e5%ba%ab-android%e5%88%a4%e6%96%b7%e7%b6%b2%e7%b5%a1%e6%98%af%e5%90%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/58425\/","title":{"rendered":"Android\u5982\u4f55\u5224\u65b7\u7db2\u7d61\u9023\u63a5\u4e26\u9023\u63a5\u6578\u64da\u5eab (android\u5224\u65b7\u7db2\u7d61\u662f\u5426\u9023\u63a5\u6578\u64da\u5eab)"},"content":{"rendered":"

Android\u5982\u4f55\u5224\u65b7\u7db2\u7d61\u9023\u63a5\u4e26\u9023\u63a5\u6578\u64da\u5eab<\/h1>\n

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\u5224\u65b7\u7db2\u7d61\u9023\u63a5\u72c0\u614b<\/h2>\n

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import android.content.Context;\nimport android.net.ConnectivityManager;\nimport android.net.NetworkInfo;\n\npublic class NetworkUtil {\n    public static boolean isNetworkAvailable(Context context) {\n        ConnectivityManager connectivityManager = \n            (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);\n        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();\n        return activeNetworkInfo != null && activeNetworkInfo.isConnected();\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u9996\u5148\u7372\u53d6ConnectivityManager\u7684\u5be6\u4f8b\uff0c\u7136\u5f8c\u6aa2\u67e5\u7576\u524d\u7684\u7db2\u7d61\u4fe1\u606f\u3002\u5982\u679cactiveNetworkInfo\u4e0d\u70banull\u4e14\u5df2\u9023\u63a5\uff0c\u5247\u8868\u793a\u7db2\u7d61\u53ef\u7528\u3002<\/p>\n
\u9023\u63a5\u6578\u64da\u5eab<\/h2>\n
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import java.io.BufferedReader;\nimport java.io.InputStreamReader;\nimport java.net.HttpURLConnection;\nimport java.net.URL;\n\npublic class DatabaseConnector {\n    public static String getDataFromServer(String urlString) {\n        StringBuilder result = new StringBuilder();\n        try {\n            URL url = new URL(urlString);\n            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();\n            urlConnection.setRequestMethod(\"GET\");\n            BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));\n            String line;\n            while ((line = reader.readLine()) != null) {\n                result.append(line);\n            }\n            reader.close();\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n        return result.toString();\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500bHttpURLConnection\u5c0d\u8c61\uff0c\u4e26\u8a2d\u7f6e\u8acb\u6c42\u65b9\u6cd5\u70baGET\u3002\u7136\u5f8c\uff0c\u6211\u5011\u8b80\u53d6\u5f9e\u670d\u52d9\u5668\u8fd4\u56de\u7684\u6578\u64da\u4e26\u5c07\u5176\u5b58\u5132\u5728StringBuilder\u4e2d\u3002<\/p>\n
\u7d50\u5408\u7db2\u7d61\u6aa2\u67e5\u8207\u6578\u64da\u5eab\u9023\u63a5<\/h2>\n
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public class MainActivity extends AppCompatActivity {\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n\n        if (NetworkUtil.isNetworkAvailable(this)) {\n            String data = DatabaseConnector.getDataFromServer(\"http:\/\/yourapi.com\/data\");\n            \/\/ \u8655\u7406\u7372\u53d6\u5230\u7684\u6578\u64da\n        } else {\n            \/\/ \u63d0\u793a\u7528\u6236\u7121\u6cd5\u9023\u63a5\u5230\u7db2\u7d61\n        }\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5728\u6d3b\u52d5\u7684onCreate\u65b9\u6cd5\u4e2d\u6aa2\u67e5\u7db2\u7d61\u72c0\u614b\u3002\u5982\u679c\u7db2\u7d61\u53ef\u7528\uff0c\u6211\u5011\u5c31\u5f9e\u6307\u5b9a\u7684API\u7372\u53d6\u6578\u64da\uff0c\u5426\u5247\u63d0\u793a\u7528\u6236\u7121\u6cd5\u9023\u63a5\u5230\u7db2\u7d61\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
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\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b78\u7fd2\u5982\u4f55\u5728Android\u4e2d\u5224\u65b7\u7db2\u7d61\u9023\u63a5\u72c0\u614b\u4e26\u6709\u6548\u9023\u63a5\u6578\u64da\u5eab\uff0c\u78ba\u4fdd\u61c9\u7528\u7a69\u5b9a\u6027\u8207\u6578\u64da\u5b8c\u6574\u6027\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-58425","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58425","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=58425"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58425\/revisions"}],"predecessor-version":[{"id":58426,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58425\/revisions\/58426"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=58425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=58425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=58425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}