Process p;  
        	try {  
        	    // Preform su to get root privledges  
        	    p = Runtime.getRuntime().exec("su");   
        	    // Attempt to write a file to a root-only  
                    DataOutputStream os = new DataOutputStream(p.getOutputStream());  
                    os.writeBytes("echo \"Do I have root?\" >/system/sd/temporary.txt\n");  
        		  
        	     // Close the terminal  
        	     os.writeBytes("exit\n");  
        	     os.flush();  
            	     try {  
        	         p.waitFor();  
        		 if (p.exitValue() != 255) { 
        		     // TODO Code to run on success 
                         }