1、Boadcast, receiverboadcast:sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));receiver:IntentFilter filter = new IntentFilter();        filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);        filter.addAction(Intent.ACTION_SCREEN_OFF);        filter.addAction(TelephonyIntents.ACTION_EMERGENCY_CALLBACK_MODE_CHANGED);        context.registerReceiver(mBroadcastReceiver, filter);處理： private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)                    || Intent.ACTION_SCREEN_OFF.equals(action)) {                String reason = intent.getStringExtra(PhoneWindowManager.SYSTEM_DIALOG_REASON_KEY);                if (!PhoneWindowManager.SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS.equals(reason)) {                    mHandler.sendEmptyMessage(MESSAGE_DISMISS);                }            } else if (TelephonyIntents.ACTION_EMERGENCY_CALLBACK_MODE_CHANGED.equals(action)) {                // Airplane mode can be changed after ECM exits if airplane toggle button                // is pressed during ECM mode                if (!(intent.getBooleanExtra("PHONE_IN_ECM_STATE", false)) &&                        mIsWaitingForEcmExit) {                    mIsWaitingForEcmExit = false;                    changeAirplaneModeSystemSetting(true);                }            }        }    };2、register listener本質是通過binder機制得以實現的一種註冊與回撥關係。註冊listener進service的通知佇列： TelephonyManager telephonyManager =                (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);        telephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_SERVICE_STATE);當事件發生時，DefaultPhoneNotifier通過binder回撥mPhoneStateListener.callback. r.callback.onServiceStateChanged(new ServiceState(state));處理：PhoneStateListener mPhoneStateListener = new PhoneStateListener() {        @Override        public void onServiceStateChanged(ServiceState serviceState) {            if (!mHasTelephony) return;            //[email protected] fix bug:10207            //final boolean inAirplaneMode = serviceState.getState() == ServiceState.STATE_POWER_OFF;            final boolean inAirplaneMode = Settings.Global.getInt(                    mContext.getContentResolver(),                    Settings.Global.AIRPLANE_MODE_ON,                    0) == 1;            mAirplaneState = inAirplaneMode ? ToggleAction.State.On : ToggleAction.State.Off;            mAirplaneModeOn.updateState(mAirplaneState);            mAdapter.notifyDataSetChanged();        }    };3、ContentObserver這是一種監聽資料庫變化來產生響應的監聽機制註冊：mContext.getContentResolver().registerContentObserver( Settings.Global.getUriFor(Settings.Global.AIRPLANE_MODE_ON), true,                mAirplaneModeObserver);)處理： private ContentObserver mAirplaneModeObserver = new ContentObserver(new Handler()) {        @Override        public void onChange(boolean selfChange) {            onAirplaneModeChanged();        }    };