如何实现静默安装Android应用

protected static void excuteSuCMD() {    Process process = null;    OutputStream out = null;    InputStream in = null;    String currentTempFilePath = "/sdcard/QQ.apk";    try {    // 请求root    process = Runtime.getRuntime().exec("su");    out = process.getOutputStream();    // 调用安装    out.write(("pm install -r " + currentTempFilePath + "\n").getBytes());    in = process.getInputStream();    int len = 0;    byte[] bs = new byte[256];    while (-1 != (len = in.read(bs))) {    String state = new String(bs, 0, len);    if (state.equals("Success\n")) {     //安装成功后的操作      }     }    } catch (IOException e) {     e.printStackTrace();    } catch (Exception e) {     e.printStackTrace();    } finally {     try {      if (out != null) {       out.flush();       out.close();      }      if (in != null) {       in.close();      }     } catch (IOException e) {      e.printStackTrace();     }    }   }