如何使用`AESCrypt.encrypt`的进度对话框

Question

我想在Android Studio的函数中使用progress dialog。在执行代码之前，此表单将出现：

protected boolean encryptFile() {

    /*
     * set input file name
     */
    String encryptFileName = mEditText.getText().toString();
    /*
     * set hint
     */
    String hint = mHintText.getText().toString();
    if(hint.isEmpty()){hint=null;}
    /*
     * set password
     */
    String password = mPassText.getText().toString();
    /*
     * select encrypted file name
     */
    String encryptedFileName = mEditText.getText().toString()+".enc";
    if(hint!=null){
        encryptedFileName = mEditText.getText().toString() + "(hint-" +hint+ ").enc";
    }
    /*
     * Encrypt
     */
    try {
        AESCrypt crypt = new AESCrypt(password);
        crypt.encrypt(2, encryptFileName, encryptedFileName);
        return true;
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (GeneralSecurityException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return false;
}


public void encrypt(int version, String fromPath, String toPath)
            throws IOException, GeneralSecurityException {
    InputStream in = null;
    OutputStream out = null;
    try {

        in = new BufferedInputStream(new FileInputStream(fromPath));
        debug("Opened for reading: " + fromPath);
        out = new BufferedOutputStream(new FileOutputStream(toPath));

        debug("Opened for writing: " + toPath);

        encrypt(version, in, out);
    } finally {
        if (in != null) {
            in.close();
        }
        if (out != null) {
            out.close();
        }           
    }
}