Android getSystemService_移动开发_编程开发_程序员俱乐部

@Override
    public Object getSystemService(String name) {
        if (WINDOW_SERVICE.equals(name)) {
            return WindowManagerImpl.getDefault();
        } else if (LAYOUT_INFLATER_SERVICE.equals(name)) {
            synchronized (mSync) {
                LayoutInflater inflater = mLayoutInflater;
                if (inflater != null) {
                    return inflater;
                }
                mLayoutInflater = inflater =
                    PolicyManager.makeNewLayoutInflater(getOuterContext());
                return inflater;
            }
        } else if (ACTIVITY_SERVICE.equals(name)) {
            return getActivityManager();
        } else if (INPUT_METHOD_SERVICE.equals(name)) {
            return InputMethodManager.getInstance(this);
        } else if (ALARM_SERVICE.equals(name)) {
            return getAlarmManager();
        } else if (ACCOUNT_SERVICE.equals(name)) {
            return getAccountManager();
        } else if (POWER_SERVICE.equals(name)) {
            return getPowerManager();
        } else if (CONNECTIVITY_SERVICE.equals(name)) {
            return getConnectivityManager();
        } else if (THROTTLE_SERVICE.equals(name)) {
            return getThrottleManager();
        } else if (WIFI_SERVICE.equals(name)) {
            return getWifiManager();
        } else if (NOTIFICATION_SERVICE.equals(name)) {
            return getNotificationManager();
        } else if (KEYGUARD_SERVICE.equals(name)) {
            return new KeyguardManager();
        } else if (ACCESSIBILITY_SERVICE.equals(name)) {
            return AccessibilityManager.getInstance(this);
        } else if (LOCATION_SERVICE.equals(name)) {
            return getLocationManager();
        } else if (SEARCH_SERVICE.equals(name)) {
            return getSearchManager();
        } else if (SENSOR_SERVICE.equals(name)) {
            return getSensorManager();
        } else if (STORAGE_SERVICE.equals(name)) {
            return getStorageManager();
        } else if (VIBRATOR_SERVICE.equals(name)) {
            return getVibrator();
        } else if (STATUS_BAR_SERVICE.equals(name)) {
            synchronized (mSync) {
                if (mStatusBarManager == null) {
                    mStatusBarManager = new StatusBarManager(getOuterContext());
                }
                return mStatusBarManager;
            }
        } else if (AUDIO_SERVICE.equals(name)) {
            return getAudioManager();
        } else if (TELEPHONY_SERVICE.equals(name)) {
            return getTelephonyManager();
        } else if (CLIPBOARD_SERVICE.equals(name)) {
            return getClipboardManager();
        } else if (WALLPAPER_SERVICE.equals(name)) {
            return getWallpaperManager();
        } else if (DROPBOX_SERVICE.equals(name)) {
            return getDropBoxManager();
        } else if (DEVICE_POLICY_SERVICE.equals(name)) {
            return getDevicePolicyManager();
        } else if (UI_MODE_SERVICE.equals(name)) {
            return getUiModeManager();
        }

        return null;
    }

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?? ?frameworks/base/core/java/android/app/ContextImpl.java