{"id":58363,"date":"2024-10-12T20:08:17","date_gmt":"2024-10-12T12:08:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/58363\/"},"modified":"2024-10-12T20:08:17","modified_gmt":"2024-10-12T12:08:17","slug":"android-handler%e8%88%87%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%af%a6%e7%8f%be%e6%96%b9%e6%b3%95-android-handler-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/58363\/","title":{"rendered":"Android Handler\u8207\u6578\u64da\u5eab\u7684\u5be6\u73fe\u65b9\u6cd5 (android handler \u6578\u64da\u5eab)"},"content":{"rendered":"

Android Handler\u8207\u6578\u64da\u5eab\u7684\u5be6\u73fe\u65b9\u6cd5<\/h1>\n

\u5728Android\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7121\u8ad6\u662f\u5132\u5b58\u7528\u6236\u8cc7\u6599\u3001\u61c9\u7528\u8a2d\u7f6e\u9084\u662f\u5176\u4ed6\u91cd\u8981\u4fe1\u606f\uff0c\u6578\u64da\u5eab\u90fd\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002\u800c\u5728\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u7dda\u7a0b\u548cUI\u66f4\u65b0\u662f\u958b\u767c\u8005\u9700\u8981\u9762\u5c0d\u7684\u4e00\u500b\u6311\u6230\u3002\u9019\u6642\uff0cAndroid\u7684Handler\u6a5f\u5236\u4fbf\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u5de5\u5177\u3002<\/p>\n

\u4ec0\u9ebc\u662fHandler\uff1f<\/h2>\n

Handler\u662fAndroid\u4e2d\u7528\u65bc\u8655\u7406\u7dda\u7a0b\u9593\u901a\u4fe1\u7684\u5de5\u5177\u3002\u5b83\u5141\u8a31\u6211\u5011\u5728\u4e3b\u7dda\u7a0b\u4e2d\u57f7\u884c\u4efb\u52d9\uff0c\u4e26\u80fd\u5920\u5c07\u6d88\u606f\u5f9e\u5176\u4ed6\u7dda\u7a0b\u767c\u9001\u5230\u4e3b\u7dda\u7a0b\u3002\u9019\u5c0d\u65bc\u9700\u8981\u66f4\u65b0UI\u7684\u64cd\u4f5c\u5c24\u70ba\u91cd\u8981\uff0c\u56e0\u70baAndroid\u4e0d\u5141\u8a31\u5728\u975e\u4e3b\u7dda\u7a0b\u4e2d\u76f4\u63a5\u66f4\u65b0UI\u3002<\/p>\n

Handler\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n

Handler\u7684\u57fa\u672c\u7528\u6cd5\u5305\u62ec\u5275\u5efaHandler\u5be6\u4f8b\u3001\u767c\u9001\u6d88\u606f\u548c\u8655\u7406\u6d88\u606f\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

public class MyActivity extends AppCompatActivity {\n    private Handler handler = new Handler(Looper.getMainLooper()) {\n        @Override\n        public void handleMessage(Message msg) {\n            \/\/ \u66f4\u65b0UI\n            textView.setText((String) msg.obj);\n        }\n    };\n\n    private void fetchDataFromDatabase() {\n        new Thread(new Runnable() {\n            @Override\n            public void run() {\n                \/\/ \u6a21\u64ec\u6578\u64da\u5eab\u64cd\u4f5c\n                String data = \"\u5f9e\u6578\u64da\u5eab\u7372\u53d6\u7684\u6578\u64da\";\n                Message message = handler.obtainMessage(0, data);\n                handler.sendMessage(message);\n            }\n        }).start();\n    }\n}<\/code><\/pre>\n
\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u5be6\u73fe<\/h2>\n
\u5728Android\u4e2d\uff0c\u5e38\u7528\u7684\u6578\u64da\u5eab\u6709SQLite\u3002\u4f7f\u7528SQLite\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u901a\u5e38\u9700\u8981\u5728\u5b50\u7dda\u7a0b\u4e2d\u9032\u884c\uff0c\u4ee5\u907f\u514d\u963b\u585e\u4e3b\u7dda\u7a0b\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5728Handler\u4e2d\u5be6\u73fe\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u793a\u4f8b\uff1a<\/p>\n
public class DatabaseHelper extends SQLiteOpenHelper {\n    public DatabaseHelper(Context context) {\n        super(context, \"mydatabase.db\", null, 1);\n    }\n\n    @Override\n    public void onCreate(SQLiteDatabase db) {\n        db.execSQL(\"CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY, name TEXT)\");\n    }\n\n    @Override\n    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {\n        db.execSQL(\"DROP TABLE IF EXISTS users\");\n        onCreate(db);\n    }\n\n    public void insertUser(String name) {\n        SQLiteDatabase db = this.getWritableDatabase();\n        ContentValues values = new ContentValues();\n        values.put(\"name\", name);\n        db.insert(\"users\", null, values);\n        db.close();\n    }\n}<\/code><\/pre>\n
\u6574\u5408Handler\u8207\u6578\u64da\u5eab\u64cd\u4f5c<\/h2>\n
\u5c07Handler\u8207\u6578\u64da\u5eab\u64cd\u4f5c\u7d50\u5408\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u7684\u8b80\u53d6\u548c\u5beb\u5165\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5b8c\u6574\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728Handler\u4e2d\u9032\u884c\u6578\u64da\u5eab\u7684\u63d2\u5165\u64cd\u4f5c\uff1a<\/p>\n
public class MyActivity extends AppCompatActivity {\n    private DatabaseHelper dbHelper;\n    private Handler handler;\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n        dbHelper = new DatabaseHelper(this);\n        handler = new Handler(Looper.getMainLooper()) {\n            @Override\n            public void handleMessage(Message msg) {\n                \/\/ \u66f4\u65b0UI\u6216\u986f\u793a\u7d50\u679c\n                Toast.makeText(MyActivity.this, \"\u6578\u64da\u63d2\u5165\u6210\u529f\", Toast.LENGTH_SHORT).show();\n            }\n        };\n    }\n\n    private void insertUser(final String name) {\n        new Thread(new Runnable() {\n            @Override\n            public void run() {\n                dbHelper.insertUser(name);\n                handler.sendEmptyMessage(0);\n            }\n        }).start();\n    }\n}<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5728Android\u958b\u767c\u4e2d\uff0cHandler\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\u5b89\u5168\u5730\u66f4\u65b0UI\u3002\u7d50\u5408SQLite\u6578\u64da\u5eab\u7684\u4f7f\u7528\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u7684\u8b80\u53d6\u548c\u5beb\u5165\u64cd\u4f5c\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u63d0\u9ad8\u4e86\u61c9\u7528\u7684\u6027\u80fd\uff0c\u9084\u80fd\u78ba\u4fdd\u7528\u6236\u9ad4\u9a57\u7684\u6d41\u66a2\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u958b\u767c\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u61c9\u7528\u90e8\u7f72\uff0c\u6211\u5011\u7684 \u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Android Handler\u8207\u6578\u64da\u5eab\u7684\u5be6\u73fe\u65b9\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u7ba1\u7406\u7570\u6b65\u4efb\u52d9\u8207\u6578\u64da\u5b58\u53d6\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\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-58363","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58363","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=58363"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58363\/revisions"}],"predecessor-version":[{"id":58364,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/58363\/revisions\/58364"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=58363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=58363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=58363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}