Android中计算文件大小的工具类：FileSizeUtil

/** *复制到类中就可以直*接调用 */ public class FileSizeUtil { public static final int SIZETYPE_B = 1;// 获取文件大小单位为B的double值 public static final int SIZETYPE_KB = 2;// 获取文件大小单位为KB的double值 public static final int SIZETYPE_MB = 3;// 获取文件大小单位为MB的double值 public static final int SIZETYPE_GB = 4;// 获取文件大小单位为GB的double值 /** * 获取文件指定文件的指定单位的大小 * * @param filePath * 文件路径 * @param sizeType * 获取大小的类型1为B、2为KB、3为MB、4为GB * @return double值的大小 */ public static double getFileOrFilesSize(String filePath, int sizeType) { File file = new File(filePath); long blockSize = 0; try { if (file.isDirectory()) { blockSize = getFileSizes(file); } else { blockSize = getFileSize(file); } } catch (Exception e) { e.printStackTrace(); Log.e("获取文件大小", "获取失败!"); } return FormetFileSize(blockSize, sizeType); } /** * 调用此方法自动计算指定文件或指定文件夹的大小 * * @param filePath * 文件路径 * @return 计算好的带B、KB、MB、GB的字符串 */ public static String getAutoFileOrFilesSize(String filePath) { File file = new File(filePath); long blockSize = 0; try { if (file.isDirectory()) { blockSize = getFileSizes(file); } else { blockSize = getFileSize(file); } } catch (Exception e) { e.printStackTrace(); Log.e("获取文件大小", "获取失败!"); } return FormetFileSize(blockSize); } /** * 获取指定文件大小 * * @param f * @return * @throws Exception */ private static long getFileSize(File file) throws Exception { long size = 0; if (file.exists()) { FileInputStream fis = null; fis = new FileInputStream(file); size = fis.available(); } else { file.createNewFile(); Log.e("获取文件大小", "文件不存在!"); } return size; } /** * 获取指定文件夹 * * @param f * @return * @throws Exception */ private static long getFileSizes(File f) throws Exception { long size = 0; File flist[] = f.listFiles(); for (int i = 0; i < flist.length; i++) { if (flist[i].isDirectory()) { size = size + getFileSizes(flist[i]); } else { size = size + getFileSize(flist[i]); } } return size; } /** * 转换文件大小 * * @param fileS * @return */ private static String FormetFileSize(long fileS) { DecimalFormat df = new DecimalFormat("#.00"); String fileSizeString = ""; String wrongSize = "0B"; if (fileS == 0) { return wrongSize; } if (fileS < 1024) { fileSizeString = df.format((double) fileS) + "B"; } else if (fileS < 1048576) { fileSizeString = df.format((double) fileS / 1024) + "KB"; } else if (fileS < 1073741824) { fileSizeString = df.format((double) fileS / 1048576) + "MB"; } else { fileSizeString = df.format((double) fileS / 1073741824) + "GB"; } return fileSizeString; } /** * 转换文件大小,指定转换的类型 * * @param fileS * @param sizeType * @return */ private static double FormetFileSize(long fileS, int sizeType) { DecimalFormat df = new DecimalFormat("#.00"); double fileSizeLong = 0; switch (sizeType) { case SIZETYPE_B: fileSizeLong = Double.valueOf(df.format((double) fileS)); break; case SIZETYPE_KB: fileSizeLong = Double.valueOf(df.format((double) fileS / 1024)); break; case SIZETYPE_MB: fileSizeLong = Double.valueOf(df.format((double) fileS / 1048576)); break; case SIZETYPE_GB: fileSizeLong = Double.valueOf(df .format((double) fileS / 1073741824)); break; default: break; } return fileSizeLong; } }