{"id":529,"date":"2013-03-28T18:32:53","date_gmt":"2013-03-28T10:32:53","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=529"},"modified":"2016-03-09T18:33:31","modified_gmt":"2016-03-09T10:33:31","slug":"android%e4%b8%ad%e7%9a%84handler%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=529","title":{"rendered":"Android\u4e2d\u7684Handler\u603b\u7ed3"},"content":{"rendered":"

\u4e00\u3001Handler\u7684\u5b9a\u4e49:<\/b><\/p>\n

\u4e3b\u8981\u63a5\u53d7\u5b50\u7ebf\u7a0b\u53d1\u9001\u7684\u6570\u636e, \u5e76\u7528\u6b64\u6570\u636e\u914d\u5408\u4e3b\u7ebf\u7a0b\u66f4\u65b0UI.<\/p>\n

\u89e3\u91ca: \u5f53\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u65f6\uff0cAndroid\u9996\u5148\u4f1a\u5f00\u542f\u4e00\u4e2a\u4e3b\u7ebf\u7a0b (\u4e5f\u5c31\u662fUI\u7ebf\u7a0b) , \u4e3b\u7ebf\u7a0b\u4e3a\u7ba1\u7406\u754c\u9762\u4e2d\u7684UI\u63a7\u4ef6\uff0c\u8fdb\u884c\u4e8b\u4ef6\u5206\u53d1, \u6bd4\u5982\u8bf4, \u4f60\u8981\u662f\u70b9\u51fb\u4e00\u4e2a Button ,Android\u4f1a\u5206\u53d1\u4e8b\u4ef6\u5230Button\u4e0a\uff0c\u6765\u54cd\u5e94\u4f60\u7684\u64cd\u4f5c\u3002\u00a0 \u5982\u679c\u6b64\u65f6\u9700\u8981\u4e00\u4e2a\u8017\u65f6\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982: \u8054\u7f51\u8bfb\u53d6\u6570\u636e\uff0c\u00a0 \u00a0 \u6216\u8005\u8bfb\u53d6\u672c\u5730\u8f83\u5927\u7684\u4e00\u4e2a\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u4f60\u4e0d\u80fd\u628a\u8fd9\u4e9b\u64cd\u4f5c\u653e\u5728\u4e3b\u7ebf\u7a0b\u4e2d\uff0c\uff0c\u5982\u679c\u4f60\u653e\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u7684\u8bdd\uff0c\u754c\u9762\u4f1a\u51fa\u73b0\u5047\u6b7b\u73b0\u8c61, \u5982\u679c5\u79d2\u949f\u8fd8\u6ca1\u6709\u5b8c\u6210\u7684\u8bdd\uff0c\uff0c\u4f1a\u6536\u5230Android\u7cfb\u7edf\u7684\u4e00\u4e2a\u9519\u8bef\u63d0\u793a\u00a0 “\u5f3a\u5236\u5173\u95ed”.\u00a0 \u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u9700\u8981\u628a\u8fd9\u4e9b\u8017\u65f6\u7684\u64cd\u4f5c\uff0c\u653e\u5728\u4e00\u4e2a\u5b50\u7ebf\u7a0b\u4e2d,\u56e0\u4e3a\u5b50\u7ebf\u7a0b\u6d89\u53ca\u5230UI\u66f4\u65b0\uff0c\uff0cAndroid\u4e3b\u7ebf\u7a0b\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u66f4\u65b0UI\u53ea\u80fd\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u66f4\u65b0\uff0c\u5b50\u7ebf\u7a0b\u4e2d\u64cd\u4f5c\u662f\u5371\u9669\u7684. \u8fd9\u4e2a\u65f6\u5019\uff0cHandler\u5c31\u51fa\u73b0\u4e86.,\u6765\u89e3\u51b3\u8fd9\u4e2a\u590d\u6742\u7684\u95ee\u9898 ,\u00a0 \u00a0 \u7531\u4e8eHandler\u8fd0\u884c\u5728\u4e3b\u7ebf\u7a0b\u4e2d(UI\u7ebf\u7a0b\u4e2d),\u00a0 \u5b83\u4e0e\u5b50\u7ebf\u7a0b\u53ef\u4ee5\u901a\u8fc7Message\u5bf9\u8c61\u6765\u4f20\u9012\u6570\u636e, \u8fd9\u4e2a\u65f6\u5019\uff0cHandler\u5c31\u627f\u62c5\u7740\u63a5\u53d7\u5b50\u7ebf\u7a0b\u4f20\u8fc7\u6765\u7684(\u5b50\u7ebf\u7a0b\u7528sedMessage()\u65b9\u6cd5\u4f20\u5f1f)Message\u5bf9\u8c61\uff0c(\u91cc\u9762\u5305\u542b\u6570\u636e)\u00a0 , \u628a\u8fd9\u4e9b\u6d88\u606f\u653e\u5165\u4e3b\u7ebf\u7a0b\u961f\u5217\u4e2d\uff0c\u914d\u5408\u4e3b\u7ebf\u7a0b\u8fdb\u884c\u66f4\u65b0UI\u3002<\/p>\n

\u4e8c\u3001Handler\u4e00\u4e9b\u7279\u70b9<\/b><\/p>\n

handler\u53ef\u4ee5\u5206\u53d1Message\u5bf9\u8c61\u548cRunnable\u5bf9\u8c61\u5230\u4e3b\u7ebf\u7a0b\u4e2d, \u6bcf\u4e2aHandler\u5b9e\u4f8b,\u90fd\u4f1a\u7ed1\u5b9a\u5230\u521b\u5efa\u4ed6\u7684\u7ebf\u7a0b\u4e2d(\u4e00\u822c\u662f\u4f4d\u4e8e\u4e3b\u7ebf\u7a0b),
\n\u5b83\u6709\u4e24\u4e2a\u4f5c\u7528: (1):\u00a0 \u5b89\u6392\u6d88\u606f\u6216Runnable \u5728\u67d0\u4e2a\u4e3b\u7ebf\u7a0b\u4e2d\u67d0\u4e2a\u5730\u65b9\u6267\u884c, (2)\u5b89\u6392\u4e00\u4e2a\u52a8\u4f5c\u5728\u4e0d\u540c\u7684\u7ebf\u7a0b\u4e2d\u6267\u884c<\/p>\n

Handler\u4e2d\u5206\u53d1\u6d88\u606f\u7684\u4e00\u4e9b\u65b9\u6cd5
\npost(Runnable)
\npostAtTime(Runnable,long)
\npostDelayed(Runnable long)
\nsendEmptyMessage(int)
\nsendMessage(Message)
\nsendMessageAtTime(Message,long)
\nsendMessageDelayed(Message,long)<\/p>\n

\u4ee5\u4e0apost\u7c7b\u65b9\u6cd5\u5141\u8bb8\u4f60\u6392\u5217\u4e00\u4e2aRunnable\u5bf9\u8c61\u5230\u4e3b\u7ebf\u7a0b\u961f\u5217\u4e2d,
\nsendMessage\u7c7b\u65b9\u6cd5, \u5141\u8bb8\u4f60\u5b89\u6392\u4e00\u4e2a\u5e26\u6570\u636e\u7684Message\u5bf9\u8c61\u5230\u961f\u5217\u4e2d\uff0c\u7b49\u5f85\u66f4\u65b0.<\/p>\n

\u4e09\u3001Handler\u5b9e\u4f8b<\/b><\/p>\n

(1) \u5b50\u7c7b\u9700\u8981\u7ee7\u627fHendler\u7c7b\uff0c\u5e76\u91cd\u5199handleMessage(Message msg) \u65b9\u6cd5, \u7528\u4e8e\u63a5\u53d7\u7ebf\u7a0b\u6570\u636e<\/p>\n

\u4ee5\u4e0b\u4e3a\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5b83\u5b9e\u73b0\u7684\u529f\u80fd\u4e3a : \u901a\u8fc7\u7ebf\u7a0b\u4fee\u6539\u754c\u9762Button\u7684\u5185\u5bb9<\/p>\n

\n
\n
    \n
  1. public class MyHandlerActivity extends Activity {<\/li>\n
  2. \u00a0 \u00a0 Button button;<\/li>\n
  3. \u00a0 \u00a0 MyHandler myHandler;<\/li>\n
  4. <\/li>\n
  5. \u00a0 \u00a0 protected void onCreate(Bundle savedInstanceState) {<\/li>\n
  6. \u00a0 \u00a0 \u00a0 \u00a0 super.onCreate(savedInstanceState);<\/li>\n
  7. \u00a0 \u00a0 \u00a0 \u00a0 setContentView(R.layout.handlertest);<\/li>\n
  8. <\/li>\n
  9. \u00a0 \u00a0 \u00a0 \u00a0 button = (Button) findViewById(R.id.button);<\/li>\n
  10. \u00a0 \u00a0 \u00a0 \u00a0 myHandler = new MyHandler();<\/li>\n
  11. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u5f53\u521b\u5efa\u4e00\u4e2a\u65b0\u7684Handler\u5b9e\u4f8b\u65f6, \u5b83\u4f1a\u7ed1\u5b9a\u5230\u5f53\u524d\u7ebf\u7a0b\u548c\u6d88\u606f\u7684\u961f\u5217\u4e2d,\u5f00\u59cb\u5206\u53d1\u6570\u636e<\/li>\n
  12. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ Handler\u6709\u4e24\u4e2a\u4f5c\u7528, (1) : \u5b9a\u65f6\u6267\u884cMessage\u548cRunnalbe \u5bf9\u8c61<\/li>\n
  13. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ (2): \u8ba9\u4e00\u4e2a\u52a8\u4f5c,\u5728\u4e0d\u540c\u7684\u7ebf\u7a0b\u4e2d\u6267\u884c.<\/li>\n
  14. <\/li>\n
  15. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u5b83\u5b89\u6392\u6d88\u606f,\u7528\u4ee5\u4e0b\u65b9\u6cd5<\/li>\n
  16. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ post(Runnable)<\/li>\n
  17. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ postAtTime(Runnable,long)<\/li>\n
  18. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ postDelayed(Runnable,long)<\/li>\n
  19. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ sendEmptyMessage(int)<\/li>\n
  20. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ sendMessage(Message);<\/li>\n
  21. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ sendMessageAtTime(Message,long)<\/li>\n
  22. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ sendMessageDelayed(Message,long)<\/li>\n
  23. <\/li>\n
  24. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u4ee5\u4e0a\u65b9\u6cd5\u4ee5 post\u5f00\u5934\u7684\u5141\u8bb8\u4f60\u5904\u7406Runnable\u5bf9\u8c61<\/li>\n
  25. \u00a0 \u00a0 \u00a0 \u00a0 \/\/sendMessage()\u5141\u8bb8\u4f60\u5904\u7406Message\u5bf9\u8c61(Message\u91cc\u53ef\u4ee5\u5305\u542b\u6570\u636e,)<\/li>\n
  26. <\/li>\n
  27. \u00a0 \u00a0 \u00a0 \u00a0 MyThread m = new MyThread();<\/li>\n
  28. \u00a0 \u00a0 \u00a0 \u00a0 new Thread(m).start();<\/li>\n
  29. \u00a0 \u00a0 }<\/li>\n
  30. <\/li>\n
  31. \u00a0 \u00a0 \/**<\/li>\n
  32. \u00a0 \u00a0 * \u63a5\u53d7\u6d88\u606f,\u5904\u7406\u6d88\u606f ,\u6b64Handler\u4f1a\u4e0e\u5f53\u524d\u4e3b\u7ebf\u7a0b\u4e00\u5757\u8fd0\u884c<\/li>\n
  33. \u00a0 \u00a0 * *\/<\/li>\n
  34. <\/li>\n
  35. \u00a0 \u00a0 class MyHandler extends Handler {<\/li>\n
  36. \u00a0 \u00a0 \u00a0 \u00a0 public MyHandler() {<\/li>\n
  37. \u00a0 \u00a0 \u00a0 \u00a0 }<\/li>\n
  38. <\/li>\n
  39. \u00a0 \u00a0 \u00a0 \u00a0 public MyHandler(Looper L) {<\/li>\n
  40. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 super(L);<\/li>\n
  41. \u00a0 \u00a0 \u00a0 \u00a0 }<\/li>\n
  42. <\/li>\n
  43. \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u5b50\u7c7b\u5fc5\u987b\u91cd\u5199\u6b64\u65b9\u6cd5,\u63a5\u53d7\u6570\u636e<\/li>\n
  44. \u00a0 \u00a0 \u00a0 \u00a0 @Override<\/li>\n
  45. \u00a0 \u00a0 \u00a0 \u00a0 public void handleMessage(Message msg) {<\/li>\n
  46. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ TODO Auto-generated method stub<\/li>\n
  47. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Log.d(“MyHandler”, “handleMessage……”);<\/li>\n
  48. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 super.handleMessage(msg);<\/li>\n
  49. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u6b64\u5904\u53ef\u4ee5\u66f4\u65b0UI<\/li>\n
  50. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Bundle b = msg.getData();<\/li>\n
  51. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String color = b.getString(“color”);<\/li>\n
  52. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 MyHandlerActivity.this.button.append(color);<\/li>\n
  53. <\/li>\n
  54. \u00a0 \u00a0 \u00a0 \u00a0 }<\/li>\n
  55. \u00a0 \u00a0 }<\/li>\n
  56. <\/li>\n
  57. \u00a0 \u00a0 class MyThread implements Runnable {<\/li>\n
  58. \u00a0 \u00a0 \u00a0 \u00a0 public void run() {<\/li>\n
  59. <\/li>\n
  60. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 try {<\/li>\n
  61. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Thread.sleep(10000);<\/li>\n
  62. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } catch (InterruptedException e) {<\/li>\n
  63. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ TODO Auto-generated catch block<\/li>\n
  64. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 e.printStackTrace();<\/li>\n
  65. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/li>\n
  66. <\/li>\n
  67. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Log.d(“thread…….”, “mThread……..”);<\/li>\n
  68. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Message msg = new Message();<\/li>\n
  69. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Bundle b = new Bundle();\/\/ \u5b58\u653e\u6570\u636e<\/li>\n
  70. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 b.putString(“color”, “\u6211\u7684”);<\/li>\n
  71. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 msg.setData(b);<\/li>\n
  72. <\/li>\n
  73. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 MyHandlerActivity.this.myHandler.sendMessage(msg); \/\/ \u5411Handler\u53d1\u9001\u6d88\u606f,\u66f4\u65b0UI<\/li>\n
  74. <\/li>\n
  75. \u00a0 \u00a0 \u00a0 \u00a0 }<\/li>\n
  76. \u00a0 \u00a0 }<\/li>\n
  77. <\/li>\n
  78. }<\/li>\n<\/ol>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    \u4e00\u3001Handler\u7684\u5b9a\u4e49: \u4e3b\u8981\u63a5\u53d7\u5b50\u7ebf\u7a0b\u53d1\u9001\u7684\u6570\u636e, \u5e76\u7528\u6b64\u6570\u636e\u914d\u5408\u4e3b\u7ebf\u7a0b\u66f4\u65b0UI. \u89e3\u91ca: \u5f53\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[91],"tags":[92,287],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/529"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=529"}],"version-history":[{"count":0,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/529\/revisions"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}