private void shutdown() {              try {                  Process process = Runtime.getRuntime().exec("su");                  DataOutputStream out = new DataOutputStream(                          process.getOutputStream());                  out.writeBytes("reboot -p\n");                  out.writeBytes("exit\n");                  out.flush();              } catch (IOException e) {                  e.printStackTrace();              }          }  private void shutdown() { try { Process process = Runtime.getRuntime().exec("su"); DataOutputStream out = new DataOutputStream( process.getOutputStream()); out.writeBytes("reboot -p\n"); out.writeBytes("exit\n"); out.flush(); } catch (IOException e) { e.printStackTrace(); } }