在我的android manager中实现文件管理器

我试着为我的android手机做一个文件管理器，我是Java的新手。。。我找到了这个源代码，我想在我的源代码中实现它，我想在按下应用程序中的菜单按钮时控制一切

import java.io.File;

public class FileUtils {

  public static boolean delete(String path) {
    final File deleteTarget = new File(path);
    return delete(deleteTarget);
  }

  public static boolean delete(File targetFile) {
    boolean deleted = true;
    try {
      deleted = targetFile.delete();
      if(!deleted && ! targetFile.isFile()) {
        throw new Exception(String.format("File could not be deleted. Path: %s", targetFile.getAbsolutePath()));
      }
      deleted = true;
    } catch (Exception e) {
      deleted = false;
    }

    return deleted;
  }

  public static boolean createDirectory(File directory) {
    boolean created = true;
    try {
      created = directory.mkdirs();
      if(!created && ! directory.isDirectory()) {
        throw new Exception(String.format("Directory could not be created. Path: %s", directory.getAbsolutePath()));
      }
      created = true;
    } catch (Exception e) {
      created = false;
    }

    return created;
  }
}

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请解释-“我想控制一切”西蒙对不起我的坏朗，我来自罗马尼亚。我按下菜单按钮，选择删除显示框来选择要删除的文件。一个更好（更容易编码）的方法是在列表视图中显示文件。然后在用户按下菜单按钮或触摸并按住文件时显示菜单。这是“Android”方式。是的，这是anwser，但我是如何做到的？@Simon如何在void函数中实现删除？