public class DataCleanHelp {    /**     * * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * *     *     * @param context     */    public static void cleanInternalCache(Context context) {        deleteDir(context.getCacheDir());    }    /**     * * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * *     *     * @param context     */    public static void cleanDatabases(Context context) {        deleteDir(new File("/data/data/"                + context.getPackageName() + "/databases"));    }    /**     * * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) *     *     * @param context     */    public static void cleanSharedPreference(Context context) {        deleteDir(new File("/data/data/"                + context.getPackageName() + "/shared_prefs"));    }    /**     * * 按名字清除本应用数据库 * *     *     * @param context     * @param dbName     */    public static void cleanDatabaseByName(Context context, String dbName) {        context.deleteDatabase(dbName);    }    /**     * * 清除/data/data/com.xxx.xxx/files下的内容 * *     *     * @param context     */    public static void cleanFiles(Context context) {        deleteDir(context.getFilesDir());    }    /**     * * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache)     *     * @param context     */    public static void cleanExternalCache(Context context) {        if (Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED)) {            deleteDir(context.getExternalCacheDir());        }    }    /**     * * 清除自定义路径下的文件，使用需小心，请不要误删。而且只支持目录下的文件删除 * *     *     * @param filePath     */    public static void cleanCustomCache(String filePath) {        deleteDir(new File(filePath));    }    /**     * * 清除本应用所有的数据 * *     *     * @param context     * @param filepath     */    public static void cleanApplicationData(Context context, String... filepath) {        cleanInternalCache(context);        cleanExternalCache(context);        cleanDatabases(context);//        cleanSharedPreference(context);        cleanFiles(context);        cleanCustomCache(PathUtil.getInstance().getVoicePath().toString());        if (filepath == null) {            return;        }        for (String filePath : filepath) {            cleanCustomCache(filePath);        }    }    public static String getApplicationDataSize(Context context) {        long size = 0;        size += getFolderSize(context.getCacheDir());        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            size += getFolderSize(context.getExternalCacheDir());        }        size += getFolderSize(new File("/data/data/" + context.getPackageName() + "/databases"));        size += getFolderSize(context.getFilesDir());        size += getFolderSize(PathUtil.getInstance().getVoicePath());        String sizeFormated = getFormatSize(size);        return sizeFormated;    }    /**     * * 删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理 * *     *//     * @param directory     *//*    private static void deleteFilesByDirectory(File directory) {        if (directory != null && directory.exists() && directory.isDirectory()) {            for (File item : directory.listFiles()) {                item.delete();            }        }    }*/    private static boolean deleteDir(File dir) {        if (dir != null && dir.isDirectory()) {            String[] children = dir.list();            for (int i = 0; i < children.length; i++) {                boolean success = deleteDir(new File(dir, children[i]));                if (!success) {                    return false;                }            }        }        return dir.delete();    }    // 获取文件      //Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据      //Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据      public static long getFolderSize(File file) {        long size = 0;        try {            File[] fileList = file.listFiles();            for (int i = 0; i < fileList.length; i++) {                // 如果下面还有文件                  if (fileList[i].isDirectory()) {                    size = size + getFolderSize(fileList[i]);                } else {                    size = size + fileList[i].length();                }            }        } catch (Exception e) {            e.printStackTrace();        }        return size;    }    /**     * 删除指定目录下文件及目录     *     * @param filePath     * @param deleteThisPath     * @return     */    public static void deleteFolderFile(String filePath, boolean deleteThisPath) {        if (!TextUtils.isEmpty(filePath)) {            try {                File file = new File(filePath);                if (file.isDirectory()) {
   // 如果下面还有文件                      File files[] = file.listFiles();                    for (int i = 0; i < files.length; i++) {                        deleteFolderFile(files[i].getAbsolutePath(), true);                    }                }                if (deleteThisPath) {                    if (!file.isDirectory()) {
   // 如果是文件，删除                          file.delete();                    } else {
   // 目录                          if (file.listFiles().length == 0) {
   // 目录下没有文件或者目录，删除                              file.delete();                        }                    }                }            } catch (Exception e) {                // TODO Auto-generated catch block                  e.printStackTrace();            }        }    }    /**     * 格式化单位     *     * @param size     * @return     */    public static String getFormatSize(double size) {        double kiloByte = size / 1024;        /*if (kiloByte < 1) {            return size + "Byte";        }*/        double megaByte = kiloByte / 1024;        if (megaByte < 1) {            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));            String resultKB = result1.setScale(2, BigDecimal.ROUND_HALF_UP)                    .toPlainString() + "KB";            return "0.00KB".equals(resultKB)?"0KB":resultKB;        }        double gigaByte = megaByte / 1024;        if (gigaByte < 1) {            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)                    .toPlainString() + "MB";        }        double teraBytes = gigaByte / 1024;        if (teraBytes < 1) {            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)                    .toPlainString() + "GB";        }        BigDecimal result4 = new BigDecimal(teraBytes);        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()                + "TB";    }    public static String getCacheSize(File file) throws Exception {        return getFormatSize(getFolderSize(file));    }}