{"id":203421,"date":"2023-08-17T06:11:32","date_gmt":"2023-08-16T22:11:32","guid":{"rendered":"https:\/\/www.idc.net\/help\/203421\/"},"modified":"2023-08-17T06:11:32","modified_gmt":"2023-08-16T22:11:32","slug":"%e5%85%a8%e9%9d%a2%e8%a7%a3%e6%9e%90application%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/203421\/","title":{"rendered":"\u5168\u9762\u89e3\u6790Application\u7684\u4f7f\u7528"},"content":{"rendered":"

[[436291]]<\/span><\/h3>\n

\u524d\u8a00<\/h3>\n

Application\u7c7b\u5728\u6bcf\u4e00\u6b21\u5f00\u53d1\u5f53\u4e2d\u662f\u6211\u4eec\u90fd\u4f1a\u9047\u5230\u7684\uff0c\u6bcf\u4e00\u4e2aAPP\u90fd\u4f1a\u6709\u4e00\u4e2aApplication\u5b9e\u4f8b\uff0c\u5b83\u62e5\u6709\u548cAPP\u4e00\u6837\u957f\u7684\u751f\u547d\u5468\u671f\uff0cApplication\u548cAPP\u4e00\u8d77\u201c\u540c\u751f\u5171\u6b7b\u201d;<\/p>\n

\u6211\u4eec\u4eca\u5929\u5c31\u6765\u8bb2\u89e3\u4e0b\uff0c\u52a0\u5f3a\u4e0b\u57fa\u7840\u548c\u5185\u529f\uff0c\u8ba9\u81ea\u5df1\u66f4\u6709\u81ea\u4fe1;<\/p>\n

\u4e00\u3001Application\u662f\u4ec0\u4e48?<\/h3>\n
    \n
  • android\u7cfb\u7edf\u4f1a\u4e3a\u6bcf\u4e00\u4e2a\u7a0b\u5e8f\u8fd0\u884c\u65f6\u521b\u5efa\u4e00\u4e2aApplication\u7c7b\u7684\u5bf9\u8c61\u4e14\u4ec5\u521b\u5efa\u4e00\u4e2a\uff0c\u6240\u4ee5Application\u80fd\u591f\u8bf4\u662f\u5355\u4f8b (singleton)\u6a21\u5f0f\u7684\u4e00\u4e2a\u7c7b;<\/li>\n
  • application\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u662f\u6574\u4e2a\u7a0b\u5e8f\u4e2d\u6700\u957f\u7684\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u5c31\u7b49\u4e8e\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u751f\u547d\u5468\u671f\u3002\u7531\u4e8e\u5b83\u662f\u5168\u5c40\u7684\u5355\u4f8b\u7684\u3002\u6240\u4ee5\u5728\u4e0d\u540c\u7684Activity,Service\u4e2d\u83b7\u5f97\u7684\u5bf9\u8c61\u90fd\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61;<\/li>\n
  • Application\u548cActivity,Service\u4e00\u6837\u662fAndroid\u6846\u67b6\u7684\u4e00\u4e2a\u7cfb\u7edf\u7ec4\u4ef6\uff0c\u5f53Android\u7a0b\u5e8f\u542f\u52a8\u65f6\u7cfb\u7edf\u4f1a\u521b\u5efa\u4e00\u4e2a Application\u5bf9\u8c61\uff0c\u7528\u6765\u5b58\u50a8\u7cfb\u7edf\u7684\u4e00\u4e9b\u4fe1\u606f;<\/li>\n
  • \u901a\u5e38\u6211\u4eec\u662f\u4e0d\u9700\u8981\u6307\u5b9a\u4e00\u4e2aApplication\u7684\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5e2e\u6211\u4eec\u521b\u5efa\uff0c\u5982\u679c\u9700\u8981\u521b\u5efa\u81ea\u5df1\u7684Application\uff0c\u90a3\u4e5f\u5f88\u7b80\u5355\uff0c\u521b\u5efa\u4e00\u4e2a\u7c7b\u7ee7\u627fApplication\u5e76\u5728AndroidManifest.xml\u6587\u4ef6\u4e2d\u7684application\u6807\u7b7e\u4e2d\u8fdb\u884c\u6ce8\u518c;<\/li>\n
  • \u542f\u52a8Application\u65f6\uff0c\u7cfb\u7edf\u4f1a\u521b\u5efa\u4e00\u4e2aPID\uff0c\u5373\u8fdb\u7a0bID\uff0c\u6240\u6709\u7684Activity\u90fd\u4f1a\u5728\u6b64\u8fdb\u7a0b\u4e0a\u8fd0\u884c;<\/li>\n
  • Application\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u662f\u6574\u4e2a\u7a0b\u5e8f\u4e2d\u6700\u957f\u7684\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u5c31\u7b49\u4e8e\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u751f\u547d\u5468\u671f\uff0c\u56e0\u4e3a\u5b83\u662f\u5168\u5c40\u7684\u5355\u4f8b\u7684\uff0c\u6240\u4ee5\u5728\u4e0d\u540c\u7684Activity,Service\u4e2d\u83b7\u5f97\u7684\u5bf9\u8c61\u90fd\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7Application\u6765\u8fdb\u884c\u4e00\u4e9b\uff0c\u5982\uff1a\u6570\u636e\u4f20\u9012\u3001\u6570\u636e\u5171\u4eab\u548c\u6570\u636e\u7f13\u5b58\u7b49\u64cd\u4f5c;<\/li>\n<\/ul>\n

    \u4e8c\u3001Application\u7c7b\u7684\u65b9\u6cd5<\/h3>\n

    \n

    1\u3001onCreate()\u65b9\u6cd5<\/h3>\n

    \u7ee7\u627f\u81ea ContextWarpper \u7c7b<\/p>\n

    \n \n \n \n 
      \n  \n  \n  \n  
    1. public<\/span> class Application extends ContextWrapper implements ComponentCallbacks2 { <\/span><\/span><\/li>\n  \n  \n  \n  
    2. ... <\/span><\/li>\n  \n  \n  \n  
    3. ... <\/span><\/li>\n  \n  \n  \n  
    4. } <\/span><\/li>\n  \n  \n  \n  
    5.  public<\/span> void onCreate() { <\/span><\/span><\/li>\n  \n  \n  \n  
    6.  } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
        \n
      • \u5728Application\u521b\u5efa\u7684\u65f6\u5019\u8c03\u7528\uff0c\u4e00\u822c\u7528\u4e8e\u521d\u59cb\u5316\u4e00\u4e9b\u4e1c\u897f\uff0c\u5982\u5168\u5c40\u7684\u5bf9\u8c61\uff0c\u73af\u5883\u7684\u914d\u7f6e;<\/li>\n
      • \u8bbe\u7f6e\u5168\u5c40\u5171\u4eab\u6570\u636e\uff0c\u5982\u5168\u5c40\u5171\u4eab\u53d8\u91cf\u3001\u65b9\u6cd5\u7b49;<\/li>\n<\/ul>\n
        \u6ce8\u610f\uff1a<\/p>\n
        \u5171\u4eab\u6570\u636e\u53ea\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u751f\u547d\u5468\u671f\u5185\u6709\u6548\uff0c\u5f53\u8be5\u5e94\u7528\u7a0b\u5e8f\u88ab\u6740\u6b7b\uff0c\u8fd9\u4e9b\u6570\u636e\u4e5f\u4f1a\u88ab\u6e05\u7a7a\uff0c\u6240\u4ee5\u53ea\u80fd\u5b58\u50a8\u4e00\u4e9b\u5177\u5907 \u4e34\u65f6\u6027\u7684\u5171\u4eab\u6570\u636e<\/p>\n
        \u8bf7\u4e0d\u8981\u6267\u884c\u8017\u65f6\u64cd\u4f5c\uff0c\u5426\u5219\u4f1a\u62d6\u6162\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u901f\u5ea6;<\/p>\n
        2\u3001onConfigurationChanged(Configuration newConfig)<\/h3>\n
        \u91cd\u5199\u6b64\u65b9\u6cd5\u53ef\u4ee5\u76d1\u542cAPP\u4e00\u4e9b\u914d\u7f6e\u4fe1\u606f\u7684\u6539\u53d8\u4e8b\u4ef6(\u5982\u5c4f\u5e55\u65cb\u8f6c\u7b49);<\/p>\n
        \u5f53\u914d\u7f6e\u4fe1\u606f\u6539\u53d8\u7684\u65f6\u5019\u4f1a\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5;<\/p>\n
        \n \n \n \n 
          \n  \n  \n  \n  
        1. registerComponentCallbacks(new ComponentCallbacks2() { <\/span><\/span><\/li>\n  \n  \n  \n  
        2.             @Override <\/span><\/li>\n  \n  \n  \n  
        3.             public<\/span> void onConfigurationChanged(Configuration newConfig) { <\/span><\/span><\/li>\n  \n  \n  \n  
        4.               ... <\/span><\/li>\n  \n  \n  \n  
        5.             } <\/span><\/li>\n  \n  \n  \n  
        6.         }); <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
          3\u3001onLowMemory()\u65b9\u6cd5<\/h3>\n
            \n
          • \u91cd\u5199\u6b64\u65b9\u6cd5\u53ef\u4ee5\u76d1\u542cAndroid\u7cfb\u7edf\u6574\u4f53\u5185\u5b58\u8f83\u4f4e\u65f6\u5019\u7684\u4e8b\u4ef6;<\/li>\n
          • \u8c03\u7528\u65f6\u523b\uff1aAndroid\u7cfb\u7edf\u6574\u4f53\u5185\u5b58\u8f83\u4f4e\u65f6;<\/li>\n<\/ul>\n
            \n \n \n \n 
              \n  \n  \n  \n  
            1. registerComponentCallbacks(new ComponentCallbacks2() { <\/span><\/span><\/li>\n  \n  \n  \n  
            2.   @Override <\/span><\/li>\n  \n  \n  \n  
            3.             public<\/span> void onLowMemory() { <\/span><\/span><\/li>\n  \n  \n  \n  
            4.             } <\/span><\/li>\n  \n  \n  \n  
            5.         }); <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
              4\u3001onTerminate()\u65b9\u6cd5<\/h3>\n
                \n
              • \u901a\u77e5 \u5e94\u7528\u7a0b\u5e8f \u5f53\u524d\u5185\u5b58\u4f7f\u7528\u60c5\u51b5(\u4ee5\u5185\u5b58\u7ea7\u522b\u8fdb\u884c\u8bc6\u522b)<\/li>\n
              • \u6839\u636e\u5f53\u524d\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u8fdb\u884c\u81ea\u8eab\u7684\u5185\u5b58\u8d44\u6e90\u7684\u4e0d\u540c\u7a0b\u5ea6\u91ca\u653e\uff0c\u4ee5\u907f\u514d\u88ab\u7cfb\u7edf\u76f4\u63a5\u6740\u6389 & \u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u4f53\u9a8c;<\/li>\n
              • \u7cfb\u7edf\u5728\u5185\u5b58\u4e0d\u8db3\u65f6\u4f1a\u6309\u7167LRU Cache\u4e2d\u4ece\u4f4e\u5230\u9ad8\u6740\u6b7b\u8fdb\u7a0b;\u4f18\u5148\u6740\u6b7b\u5360\u7528\u5185\u5b58\u8f83\u9ad8\u7684\u5e94\u7528;<\/li>\n<\/ul>\n
                \n \n \n \n 
                  \n  \n  \n  \n  
                1. registerComponentCallbacks(new ComponentCallbacks2() { <\/span><\/span><\/li>\n  \n  \n  \n  
                2. @Override <\/span><\/li>\n  \n  \n  \n  
                3.   public<\/span> void onTrimMemory(<\/span>int<\/span> <\/span>level<\/span>) { <\/span><\/span><\/li>\n  \n  \n  \n  
                4.   \/\/ Android\u7cfb\u7edf\u4f1a\u6839\u636e\u5f53\u524d\u5185\u5b58\u4f7f\u7528\u7684\u60c5\u51b5\uff0c\u4f20\u5165\u5bf9\u5e94\u7684\u7ea7\u522b <\/span><\/li>\n  \n  \n  \n  
                5.   \/\/ \u4e0b\u9762\u4ee5\u6e05\u9664\u7f13\u5b58\u4e3a\u4f8b\u5b50\u4ecb\u7ecd <\/span><\/li>\n  \n  \n  \n  
                6.     super.onTrimMemory(level<\/span>); <\/span><\/span><\/li>\n  \n  \n  \n  
                7.   .   if (level<\/span> >= ComponentCallbacks2.TRIM_MEMORY_MODERATE) { <\/span><\/span><\/li>\n  \n  \n  \n  
                8.         mPendingRequests.clear(); <\/span><\/li>\n  \n  \n  \n  
                9.         mBitmapHolderCache.evictAll(); <\/span><\/li>\n  \n  \n  \n  
                10.         mBitmapCache.evictAll(); <\/span><\/li>\n  \n  \n  \n  
                11.     } <\/span><\/li>\n  \n  \n  \n  
                12.         }); <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                  5\u3001registerActivityLifecycleCallbacks()\u548cunregisterActivityLifecycleCallbacks()<\/h3>\n
                  \u8fd9\u4e24\u4e2a\u65b9\u6cd5\u7528\u4e8e\u6ce8\u518c\u6216\u8005\u6ce8\u9500\u5bf9APP\u5185\u6240\u6709Activity\u7684\u751f\u547d\u5468\u671f\u76d1\u542c;<\/p>\n
                  \u5f53APP\u5185Activity\u7684\u751f\u547d\u5468\u671f\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u5c31\u4f1a\u8c03\u7528ActivityLifecycleCallbacks\u91cc\u9762\u7684\u65b9\u6cd5\uff1a<\/p>\n
                  \n \n \n \n 
                    \n  \n  \n  \n  
                  1. registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() { <\/span><\/span><\/li>\n  \n  \n  \n  
                  2.             @Override <\/span><\/li>\n  \n  \n  \n  
                  3.             public<\/span> void onActivityCreated(Activity activity, Bundle savedInstanceState) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  4.                 Log.e(TAG,\"onActivityCreated: \"<\/span> + activity.getLocalClassName()); <\/span><\/span><\/li>\n  \n  \n  \n  
                  5.             } <\/span><\/li>\n  \n  \n  \n  
                  6.             @Override <\/span><\/li>\n  \n  \n  \n  
                  7.             public<\/span> void onActivityStarted(Activity activity) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  8.                 Log.e(TAG,\"onActivityStarted: \"<\/span> + activity.getLocalClassName()); <\/span><\/span><\/li>\n  \n  \n  \n  
                  9.             } <\/span><\/li>\n  \n  \n  \n  
                  10.             @Override <\/span><\/li>\n  \n  \n  \n  
                  11.             public<\/span> void onActivityResumed(Activity activity) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  12.                 Log.e(TAG,\"onActivityResumed: \"<\/span> + activity.getLocalClassName()); <\/span><\/span><\/li>\n  \n  \n  \n  
                  13.             } <\/span><\/li>\n  \n  \n  \n  
                  14.             @Override <\/span><\/li>\n  \n  \n  \n  
                  15.             public<\/span> void onActivityPaused(Activity activity) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  16.                 Log.e(TAG,\"onActivityPaused: \"<\/span> + activity.getLocalClassName()); <\/span><\/span><\/li>\n  \n  \n  \n  
                  17.             } <\/span><\/li>\n  \n  \n  \n  
                  18.             @Override <\/span><\/li>\n  \n  \n  \n  
                  19.             public<\/span> void onActivityStopped(Activity activity) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  20.                 Log.e(TAG, \"onActivityStopped: \"<\/span> + activity.getLocalClassName()); <\/span><\/span><\/li>\n  \n  \n  \n  
                  21.             } <\/span><\/li>\n  \n  \n  \n  
                  22.             @Override <\/span><\/li>\n  \n  \n  \n  
                  23.             public<\/span> void onActivitySaveInstanceState(Activity activity, Bundle outState) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  24.             } <\/span><\/li>\n  \n  \n  \n  
                  25.             @Override <\/span><\/li>\n  \n  \n  \n  
                  26.             public<\/span> void onActivityDestroyed(Activity activity) { <\/span><\/span><\/li>\n  \n  \n  \n  
                  27.                 Log.e(TAG,\"onActivityDestroyed: \"<\/span> + activity.getLocalClassName()); <\/span><\/span><\/li>\n  \n  \n  \n  
                  28.             } <\/span><\/li>\n  \n  \n  \n  
                  29.         }); <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                    \u67e5\u770blog\u6253\u5370\u7684\u60c5\u51b5\u5982\u4e0b\uff1a<\/p>\n
                    \n \n \n \n 
                      \n  \n  \n  \n  
                    1. onActivityPaused: MainActivity <\/span><\/span><\/li>\n  \n  \n  \n  
                    2. onActivityStopped: MainActivity <\/span><\/li>\n  \n  \n  \n  
                    3. onActivityStarted: MainActivity <\/span><\/li>\n  \n  \n  \n  
                    4. onActivityResumed: MainActivity <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                      6\u3001registerComponentCallbacks()\u548cunregisterComponentCallbacks()\u65b9\u6cd5<\/h3>\n
                      \u6ce8\u518c\u548c\u6ce8\u9500 ComponentCallbacks2\u56de\u8c03\u63a5\u53e3<\/p>\n
                      \n \n \n \n 
                        \n  \n  \n  \n  
                      1. registerComponentCallbacks(new ComponentCallbacks2() { <\/span><\/span><\/li>\n  \n  \n  \n  
                      2.             @Override <\/span><\/li>\n  \n  \n  \n  
                      3.             public<\/span> void onTrimMemory(<\/span>int<\/span> <\/span>level<\/span>) { <\/span><\/span><\/li>\n  \n  \n  \n  
                      4.             } <\/span><\/li>\n  \n  \n  \n  
                      5.             @Override <\/span><\/li>\n  \n  \n  \n  
                      6.             public<\/span> void onConfigurationChanged(Configuration newConfig) { <\/span><\/span><\/li>\n  \n  \n  \n  
                      7.             } <\/span><\/li>\n  \n  \n  \n  
                      8.             @Override <\/span><\/li>\n  \n  \n  \n  
                      9.             public<\/span> void onLowMemory() { <\/span><\/span><\/li>\n  \n  \n  \n  
                      10.             } <\/span><\/li>\n  \n  \n  \n  
                      11.         }); <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                        \u4e09\u3001\u5e94\u7528\u573a\u666f\u548c\u81ea\u5b9a\u4e49<\/h2>\n
                        1\u3001\u5e94\u7528\u573a\u666f<\/h3>\n
                          \n
                        • \u521d\u59cb\u5316\u5e94\u7528\u7a0b\u5e8f\u7ea7\u522b\u7684\u8d44\u6e90\uff0c\u5982\u5168\u5c40\u5bf9\u8c61;<\/li>\n
                        • \u6570\u636e\u5171\u4eab\u3001\u6570\u636e\u7f13\u5b58;<\/li>\n
                        • \u83b7\u53d6\u5e94\u7528\u7a0b\u5e8f\u5f53\u524d\u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u53ca\u65f6\u91ca\u653e\u8d44\u6e90\uff0c\u4ece\u800c\u907f\u514d\u88ab\u7cfb\u7edf\u6740\u6b7b;<\/li>\n
                        • \u76d1\u542c\u5e94\u7528\u7a0b\u5e8f\u914d\u7f6e\u4fe1\u606f\u7684\u6539\u53d8\uff0c\u5982\u5c4f\u5e55\u65cb\u8f6c\u7b49;<\/li>\n
                        • \u76d1\u542c\u5e94\u7528\u7a0b\u5e8f\u5185\uff0c\u6240\u6709Activity\u7684\u751f\u547d\u5468\u671f;<\/li>\n<\/ul>\n
                          2\u3001\u81ea\u5b9a\u4e49Application<\/h3>\n
                          (1)\u7ee7\u627fApplication<\/p>\n
                          \n \n \n \n 
                            \n  \n  \n  \n  
                          1. public<\/span> class MyApplication extends Application{ <\/span><\/span><\/li>\n  \n  \n  \n  
                          2.    \/**\u58f0\u660e\u53d8\u91cf*\/ <\/span><\/li>\n  \n  \n  \n  
                          3.     private String value; <\/span><\/li>\n  \n  \n  \n  
                          4.     @Override <\/span><\/li>\n  \n  \n  \n  
                          5.     public<\/span> void onCreate() { <\/span><\/span><\/li>\n  \n  \n  \n  
                          6.         super.onCreate(); <\/span><\/li>\n  \n  \n  \n  
                          7.         \/\/ \u521d\u59cb\u5316\u5168\u5c40\u53d8\u91cf <\/span><\/li>\n  \n  \n  \n  
                          8.         setValue(VALUE);  <\/span><\/li>\n  \n  \n  \n  
                          9.     } <\/span><\/li>\n  \n  \n  \n  
                          10.     public<\/span> void setValue(String value){ <\/span><\/span><\/li>\n  \n  \n  \n  
                          11.         this.value = value; <\/span><\/li>\n  \n  \n  \n  
                          12.     } <\/span><\/li>\n  \n  \n  \n  
                          13.     public<\/span> String getValue(){ <\/span><\/span><\/li>\n  \n  \n  \n  
                          14.         return<\/span> value; <\/span><\/span><\/li>\n  \n  \n  \n  
                          15.     } <\/span><\/li>\n  \n  \n  \n  
                          16. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                            \u6ce8\u610f\uff1a\u7ee7\u627fApplication\u7c7b\uff0c\u4e3b\u8981\u91cd\u5199\u91cc\u9762\u7684onCreate()\u65b9\u6cd5(android.app.Application\u5305\u7684onCreate()\u624d\u662f\u771f\u6b63\u7684Android\u7a0b\u5e8f\u7684\u5165\u53e3\u70b9)\uff0c\u5c31\u662f\u521b\u5efa\u7684\u65f6\u5019\uff0c\u521d\u59cb\u5316\u53d8\u91cf\u7684\u503c\u3002\u7136\u540e\u5728\u6574\u4e2a\u5e94\u7528\u4e2d\u7684\u5404\u4e2a\u6587\u4ef6\u4e2d\u5c31\u53ef\u4ee5\u5bf9\u8be5\u53d8\u91cf\u8fdb\u884c\u64cd\u4f5c\u4e86;<\/p>\n
                            (2)\u5728ApplicationManifest.xml\u6587\u4ef6\u4e2d\u914d\u7f6e\u81ea\u5b9a\u4e49\u7684Application<\/p>\n
                            \n \n \n \n 
                              \n  \n  \n  \n  
                            1. <application <\/span><\/span><\/li>\n  \n  \n  \n  
                            2.        android:name<\/span>=<\/span>\"MyApplication\"<\/span>> <\/span><\/span><\/li>\n  \n  \n  \n  
                            3. <\/application> <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                              (3)\u4f7f\u7528\u81ea\u5b9a\u4e49\u7684Application\u7c7b\u5b9e\u4f8b<\/p>\n
                              \n \n \n \n 
                                \n  \n  \n  \n  
                              1. private MyApplication app; <\/span><\/span><\/li>\n  \n  \n  \n  
                              2. \/\/ \u53ea\u9700\u8981\u8c03\u7528Activity.getApplication\uff08\uff09 \u6216Context.getApplicationContext\uff08\uff09\u5c31\u53ef\u4ee5\u83b7\u5f97\u4e00\u4e2aApplication\u5bf9\u8c61 <\/span><\/li>\n  \n  \n  \n  
                              3. app = (MyApplication) getApplication(); <\/span><\/li>\n  \n  \n  \n  
                              4. \/\/ \u7136\u540e\u518d\u5f97\u5230\u76f8\u5e94\u7684\u6210\u5458\u53d8\u91cf \u6216\u65b9\u6cd5 \u5373\u53ef <\/span><\/li>\n  \n  \n  \n  
                              5. app.getValue(); <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                \u603b\u7ed3<\/h3>\n
                                \u6bcf\u4e2aAndroid App\u8fd0\u884c\u65f6\uff0c\u4f1a\u9996\u5148\u81ea\u52a8\u521b\u5efaApplication \u7c7b\u5e76\u5b9e\u4f8b\u5316 Application \u5bf9\u8c61\uff0c\u4e14\u53ea\u6709\u4e00\u4e2a\u5373 Application\u7c7b \u662f\u5355\u4f8b\u6a21\u5f0f(singleton)\u7c7b;<\/p>\n
                                \u5373\u4e0d\u540c\u7684\u7ec4\u4ef6(\u5982Activity\u3001Service)\u90fd\u53ef\u83b7\u5f97Application\u5bf9\u8c61\u4e14\u90fd\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61;<\/p>\n
                                Application \u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u662f\u6574\u4e2a\u7a0b\u5e8f\u4e2d\u6700\u957f\u7684\uff0c\u5373\u7b49\u4e8eAndroid App\u7684\u751f\u547d\u5468\u671f;<\/p>\n
                                \u672c\u6587\u8f6c\u8f7d\u81ea\u5fae\u4fe1\u516c\u4f17\u53f7\u300cAndroid\u5f00\u53d1\u7f16\u7a0b\u300d<\/p>\n
                                \n
                                 <\/p>\n","protected":false},"excerpt":{"rendered":"
                                [[436291]] \u524d\u8a00 Application\u7c7b\u5728\u6bcf\u4e00\u6b21\u5f00\u53d1\u5f53\u4e2d\u662f\u6211\u4eec\u90fd\u4f1a\u9047\u5230\u7684\uff0c\u6bcf\u4e00\u4e2aAPP\u90fd\u4f1a\u6709\u4e00\u4e2aA […]<\/p>\n","protected":false},"author":1,"featured_media":203422,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[195111],"tags":[],"class_list":["post-203421","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/203421","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=203421"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/203421\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/203422"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=203421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=203421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=203421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}