Android中的全局监听方式

1.使用Settings.system.get/set
   1.监听Context.getContentResolver().registerContentObserver(Settings.System.getUriFor(DEF_SENSOR_STATE), false, ContentObserver);
   2.获取Settings.System.getInt(getApplicationContext().getContentResolver(), DEF_SENSOR_STATE, -1); // 获取
   3.设置 Settings.System.putInt(getApplicationContext().getContentResolver(), "sensor_state", 2);
   4.也可以notify ：Context().getContentResolver().notifyChange(SLEEP_DURATION_URI, null);

根据contentprovider 生成对应的uri 就能监听 uri 对应的值 的改变
ContentObserver callback中查询 Cursorcursor=context.getContentResolver().query(STEP_HOURS_URI,507  null,null,null,null);508  inthours=cursor.getExtras().getInt(STEP_HOURS_PATH,0);