Android Open Source - libaums Usb File List Adapter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * (C) Copyright 2014 mjahnen <jahnen@in.tum.de>
 *//www . j a  va2s  .c  om
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.github.mjdev.libaums.usbfileman;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import com.github.mjdev.libaums.fs.UsbFile;

/**
 * List adapter to represent the contents of an {@link UsbFile} directory.
 * 
 * @author mjahnen
 * 
 */
public class UsbFileListAdapter extends ArrayAdapter<UsbFile> {

  /**
   * Class to compare {@link UsbFile}s. If the {@link UsbFile} is an directory
   * it is rated lower than an file, ie. directories come first when sorting.
   */
  private Comparator<UsbFile> comparator = new Comparator<UsbFile>() {

    @Override
    public int compare(UsbFile lhs, UsbFile rhs) {

      if (lhs.isDirectory() && !rhs.isDirectory()) {
        return -1;
      }

      if (rhs.isDirectory() && !lhs.isDirectory()) {
        return 1;
      }

      return lhs.getName().compareToIgnoreCase(rhs.getName());
    }
  };

  private List<UsbFile> files;
  private UsbFile currentDir;

  private LayoutInflater inflater;

  /**
   * Constructs a new List Adapter to show {@link UsbFile}s.
   * 
   * @param context
   *            The context.
   * @param dir
   *            The directory which shall be shown.
   * @throws IOException
   *             If reading fails.
   */
  public UsbFileListAdapter(Context context, UsbFile dir) throws IOException {
    super(context, R.layout.list_item);
    currentDir = dir;
    files = new ArrayList<UsbFile>();

    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    refresh();
  }

  /**
   * Reads the contents of the directory and notifies that the View shall be
   * updated.
   * 
   * @throws IOException
   *             If reading contents of a directory fails.
   */
  public void refresh() throws IOException {
    files = Arrays.asList(currentDir.listFiles());
    Collections.sort(files, comparator);
    notifyDataSetChanged();
  }

  @Override
  public int getCount() {
    return files.size();
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    View view;
    if (convertView != null) {
      view = convertView;
    } else {
      view = inflater.inflate(R.layout.list_item, parent, false);
    }

    TextView typeText = (TextView) view.findViewById(R.id.type_text_view);
    TextView nameText = (TextView) view.findViewById(R.id.name_text_view);
    UsbFile file = files.get(position);
    if (file.isDirectory()) {
      typeText.setText("Directory");
    } else {
      typeText.setText("File");
    }
    nameText.setText(file.getName());

    return view;
  }

  @Override
  public UsbFile getItem(int position) {
    return files.get(position);
  }

  /**
   * 
   * @return the directory which is currently be shown.
   */
  public UsbFile getCurrentDir() {
    return currentDir;
  }

}

Java Source Code List

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