Android Open Source - robotronic Cache Cleaner

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Back to project page robotronic.

License

The source code is released under:

Copyright (C) 2011 by Drew Schrauf Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the So...

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Java Source Code

package com.drewschrauf.robotronic.threads;
//  w  w w . j  a  v  a  2  s.c  om
import java.io.File;
import java.util.Arrays;
import java.util.Comparator;

import android.content.Context;
import android.os.Environment;

public class CacheCleaner {

  /**
   * The number of files to keep in the cache directory
   */
  public static final int KEEP_FILES_COUNT = 50;

  /**
   * Not yet implemented
   * Cleans the DB to remove old entries
   */
  public static void cleanDB() {
  }

  /**
   * Delete the oldest files from the cache directory
   * 
   * @param context
   *            The activity that created the ThreadHandler that spawned this
   *            CacheCleaner
   */
  public static void cleanFilesystem(Context context) {
    // make the folder for the cache
    String cacheDirString = Environment.getExternalStorageDirectory()
        .getAbsolutePath();
    cacheDirString += "/android/data/" + context.getPackageName()
        + "/cache/";
    File cacheDir = new File(cacheDirString);

    if (cacheDir.exists()) {
      File[] files = cacheDir.listFiles();

      // sort the files from oldest to newest
      Arrays.sort(files, new Comparator<File>() {
        public int compare(File o1, File o2) {

          if (((File) o1).lastModified() > ((File) o2).lastModified()) {
            return +1;
          } else if (((File) o1).lastModified() < ((File) o2)
              .lastModified()) {
            return -1;
          } else {
            return 0;
          }
        }
      });

      int filesToDelete = files.length > KEEP_FILES_COUNT ? files.length
          - KEEP_FILES_COUNT : 0;
      for (int i = 0; i < filesToDelete; i++) {
        File file = files[i];
        file.delete();
      }
    }

  }
}

Java Source Code List