禁止android显示状态栏

不让整个系统显示状态栏（信号格、运营商、时间、蓝牙、电量、wifi等），打开下面路径下文件。注释注释掉代码。
alps\frameworks\base\packages\SystemUI\src\com\android\systemui\ SystemUIService.java
public void onCreate() {
//注掉以下代码
 /* boot Systemui Service HashMap components = new HashMap();
 final int N = SERVICES.length;
 for (int i=0; i cl = SERVICES[i];
 Log.d(TAG, "loading: " + cl); try { mServices[i] = (SystemUI)cl.newInstance();
 } catch (IllegalAccessException ex) {
 throw new RuntimeException(ex); 
} catch (InstantiationException ex) {
 throw new RuntimeException(ex); 
} mServices[i].mContext = this; mServices[i].mComponents = components;
 Log.d(TAG, "running: " + mServices[i]); mServices[i].start(); } */
 }