Android 擷取檔案大小

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android 擷取檔案夾、檔案的大小 以B、KB、MB、GB 為單位

FileSizeUtil 

public class FileSizeUtil {public static final int SIZETYPE_B = 1;//擷取檔案大小單位為B的double值public static final int SIZETYPE_KB = 2;//擷取檔案大小單位為KB的double值public static final int SIZETYPE_MB = 3;//擷取檔案大小單位為MB的double值public static final int SIZETYPE_GB = 4;//擷取檔案大小單位為GB的double值/*** 擷取檔案指定檔案的指定單位的大小* @param filePath 檔案路徑* @param sizeType 擷取大小的類型1為B、2為KB、3為MB、4為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("擷取檔案大小","擷取失敗!");}return FormetFileSize(blockSize, sizeType);}/*** 調用此方法自動計算指定檔案或指定檔案夾的大小* @param filePath 檔案路徑* @return 計算好的帶B、KB、MB、GB的字串*/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("擷取檔案大小","擷取失敗!");}return FormetFileSize(blockSize);}/*** 擷取指定檔案大小* @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("擷取檔案大小","檔案不存在!"); } return size;} /*** 擷取指定檔案夾* @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;}/** * 轉換檔大小 * @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;}/** * 轉換檔大小,指定轉換的類型 * @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;}

 

Android 擷取檔案大小