android 获取文件夹、文件的大小 以B、KB、MB、GB 为单位
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;}