import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat;

/**
 * Created by Administrator on 2018/6/22 0022.
 */
public class FileSizeUtil {
    private static final String TAG=FileSizeUtil.class.getSimpleName();

    public static final int SIZETYPE_B = 1;//獲取檔案大小單位為B的double值
public static final int 
 
SIZETYPE_KB = 2;//獲取檔案大小單位為KB的double值
public static final int SIZETYPE_MB = 3;//獲取檔案大小單位為MB的double值
public static final int SIZETYPE_GB = 4;//獲取檔案大小單位為GB的double值
    /**
     * 獲取檔案指定檔案的指定單位的大小
     *
     * @param filePath 檔案路徑
     * @param sizeType 獲取大小的型別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();
        }
        return FormetFileSize(blockSize, sizeType);
    }

    /**
     * 呼叫此方法自動計算指定檔案或指定資料夾的大小
     *
     * @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();
        }
        return FormetFileSize(blockSize);
    }

    /**
     * 獲取指定檔案大小
     *
     * @param file
* @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();
        }
        return size;
    }

    /**
     * 獲取指定資料夾
     *
     * @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;
    }

    /**
     * 轉換檔案大小
     *
     * @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;
    }

    /**
     * 轉換檔案大小,指定轉換的型別
     *
     * @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;
    }
}