import org.apache.commons.io.comparator.SizeFileComparator; //导入依赖的package包/类
@SuppressWarnings("unchecked")
@Test
public void largeContentCacheFilesAreNotKeptOnDisk() throws IOException
{
    quota.setMaxFileSizeMB(3);
    writeSingleFileInMB(1);
    writeSingleFileInMB(2);
    writeSingleFileInMB(3);
    writeSingleFileInMB(4);
    
    List<File> files = new ArrayList<File>(findCacheFiles());
    assertEquals(3, files.size());
    Collections.sort(files,SizeFileComparator.SIZE_COMPARATOR);
    assertEquals(1, files.get(0).length() / FileUtils.ONE_MB);
    assertEquals(2, files.get(1).length() / FileUtils.ONE_MB);
    assertEquals(3, files.get(2).length() / FileUtils.ONE_MB);
}
 

import org.apache.commons.io.comparator.SizeFileComparator; //导入依赖的package包/类
/**
    * Get big files until 250 Mb
    * @return big files until 250 Mb
    */
   public static File [] getBig() {

FileFilter fileFilter = new FileFilter() {
    
   // @Override
    public boolean accept(File pathname) {
	if (pathname.toString().endsWith("Mb.txt")) {
	    return true;
	}
	return false;
    }
};

File[] files = FileGenerator.getHomeDirectory().listFiles(fileFilter);
Arrays.sort(files, SizeFileComparator.SIZE_COMPARATOR);
	
return files;

   }
 

import org.apache.commons.io.comparator.SizeFileComparator; //导入依赖的package包/类
public ArrayList<FileItem> getFilesItemsInCurrentDirectory() {
    Operations op = Operations.getInstance(mContext);
    Constants.SORT_OPTIONS option = op.getmCurrentSortOption();
    Constants.FILTER_OPTIONS filterOption = op.getmCurrentFilterOption();
    if (mFileNavigator.getmCurrentNode() == null) mFileNavigator.setmCurrentNode(mFileNavigator.getmRootNode());
    File[] files = mFileNavigator.getFilesInCurrentDirectory();
    if (files != null) {
        mFiles.clear();
        Comparator<File> comparator = NameFileComparator.NAME_INSENSITIVE_COMPARATOR;
        switch(option) {
            case SIZE:
                comparator = SizeFileComparator.SIZE_COMPARATOR;
                break;
            case LAST_MODIFIED:
                comparator = LastModifiedFileComparator.LASTMODIFIED_COMPARATOR;
                break;
        }
        Arrays.sort(files,comparator);
        for (int i = 0; i < files.length; i++) {
            boolean addToFilter = true;
            switch(filterOption) {
                case FILES:
                    addToFilter = !files[i].isDirectory();
                    break;
                case FOLDER:
                    addToFilter = files[i].isDirectory();
                    break;
            }
            if (addToFilter)
                mFiles.add(new FileItem(files[i]));
        }
    }
    return mFiles;
}