获取root权限，root权限,Process p; t

获取root权限，root权限,Process p; t

Process p; try {     p = Runtime.getRuntime().exec("su");     DataOutputStream os = new DataOutputStream(p.getOutputStream());     os.writeBytes("echo \"Do I have root?\" >/system/sd/temporary.txt\n");    os.writeBytes("exit\n");     os.flush();     try {        p.waitFor();         if(p.exitValue() != 255)            toastMessage("root");        else            toastMessage("not root");        } catch(InterruptedException e) {         toastMessage("not root");     } } catch(IOException e) {     toastMessage("not root"); }