Android Open Source - filelistview List Utils

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License

The source code is released under:

MIT License

Java Source Code

package com.jcw.andriod.fileListView;
/*from   www.j  a  v  a2  s.com*/
/*
 * Created by Jackson Woodruff on 19/07/2014 
 *
 *
 * This is a simple utils class that contains methods
 * such as search, sort, etc..
 *
 * Mainly used to stop the bloating of the FileListView class
 *
 * It is also a replacement of the ListUtils.scala to
 * remove the dependency on the (rather large) scala
 * library.
 */

import java.io.File;
import java.util.*;

public class ListUtils {

    //takes a list of files and a list of
    //accepted file types and filers them accordingly
    //returns the input list on empty input
    public static File[] filterExtensions(File[] files, String[] extensions) {
        //if there are no extensions passed, then all should be okay
        if (extensions.length == 0)
            return files;

        List<File> filteredFiles = new ArrayList<File>();
        for (File file : files) {
            for (String extension : extensions) {
                if (file.getName().endsWith(extension) || file.isDirectory()) {
                    filteredFiles.add(file);
                    break;
                }
            }
        }
        return filteredFiles.toArray(new File[0]);
    }

    //returns the same list on an empty input
    public static File[] search(File[] files, String phrase) {
        if (phrase.equals("")) {
            return files;
        }

        List<File> searchedFiles = new ArrayList<File>();
        for (File file : files) {
            if (file.getName().contains(phrase)) {
                searchedFiles.add(file);
            }
        }
        return searchedFiles.toArray(new File[0]);
    }

    public static File[] sortByName(File[] files) {
        //make a clone of the file list in case
        //someone wants to keep the same base list
        File[] fileClone = files.clone();
        Comparator<File> comparator = new Comparator<File>() {
            @Override
            public int compare(File file, File file2) {
                return file.getName().compareTo(file2.getName());
            }
        };
        Arrays.sort(fileClone, comparator);
        return fileClone;
    }

    public static File[] directoriesOnly(File[] files, boolean directoriesOnly) {
        if (!directoriesOnly)
            return files;

        List<File> results = new ArrayList<File>();
        for (File file : files) {
            if (file.isDirectory()) {
                results.add(file);
            }
        }
        return results.toArray(new File[0]);
    }

    public static File[] sortByDate(File[] files) {
        //also clone the file here, for the same reason described above
        File[] filesClone = files.clone();
        Comparator<File> comparator = new Comparator<File>() {
            @Override
            public int compare(File file, File file2) {
                return file.lastModified() > file2.lastModified() ? 1 : -1;
            }
        };
        Arrays.sort(filesClone, comparator);
        return filesClone;
    }

    public static File[] sortNewestOldest(File[] files) {
        List<File> tempList = Arrays.asList(sortByDate(files.clone()));
        Collections.reverse(tempList);
        return tempList.toArray(new File[0]);
    }

    public static File[] join(File[] f1, File[] f2) {
        File[] result = new File[f1.length + f2.length];
        List<File> combined = new ArrayList<File>();

        for (File file : f1) {
            combined.add(file);
        }
        for (File file : f2) {
            combined.add(file);
        }
        combined.toArray(result);
        return result;
    }
}

Java Source Code List

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