显示和隐藏状态栏

需要root，不同的版本可能需要一定的修改

public static void showSystemBar(){

		try {
				Process proc = Runtime.getRuntime().exec("am startservice --user 0 -n com.android.systemui/.SystemUIService");
				proc.waitFor();
			
		    } catch (IOException e) {
			   // TODO Auto-generated catch block
			   e.printStackTrace();
		    }catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static void hideSystemBar(){
		
		 //  去掉系统栏
        try{
            //REQUIRES ROOT
            Build.VERSION_CODES vc = new Build.VERSION_CODES();
            Build.VERSION vr = new Build.VERSION();
            String ProcID = "79"; //HONEYCOMB AND OLDER

            //v.RELEASE  //4.0.3
            if(vr.SDK_INT >= vc.ICE_CREAM_SANDWICH){
                ProcID = "42"; //ICS AND NEWER
            }



            //REQUIRES ROOT
            Process proc = Runtime.getRuntime().exec(new String[]{"su","-c","service call activity "+ 42 +" s16 com.android.systemui"}); //WAS 79
            proc.waitFor();

        }catch(Exception ex){
//            Toast.makeText(getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show();
        }
		
	}

	public static void execHideSystemBarShell(){
		
		String cmd="su -c service call activity 42 s16 com.android.systemui";
	       try{  
	              //权限设置
	              Process p = Runtime.getRuntime().exec("su");  
	              //获取输出流
	              OutputStream outputStream = p.getOutputStream();
	              DataOutputStream dataOutputStream=new DataOutputStream(outputStream);
	              //将命令写入
	              dataOutputStream.writeBytes(cmd);
	              //提交命令
	              dataOutputStream.flush();
	              //关闭流操作
	              dataOutputStream.close();
	              outputStream.close();
	         }  
	         catch(Throwable t)  
	          {  
	               t.printStackTrace();  
	              } 
	      }