1.工具类
package mon.utils;
import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat;public classFileSizeUtil {private static final String TAG=FileSizeUtil.class.getSimpleName();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, intsizeType) {
File file= newFile(filePath);long blockSize = 0;try{if(file.isDirectory()) {
blockSize=getFileSizes(file);
}else{
blockSize=getFileSize(file);
}
}catch(Exception e) {
e.printStackTrace();
}returnFormetFileSize(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 staticString getAutoFileOrFilesSize(String filePath) {
File file= newFile(filePath);long blockSize = 0;try{if(file.isDirectory()) {
blockSize=getFileSizes(file);
}else{
blockSize=getFileSize(file);
}
}catch(Exception e) {
e.printStackTrace();
}returnformatFileSize(blockSize);
}/**
* 获取指定文件大小*/
private static longgetFileSize(File file) throws Exception {long size = 0;if(file.exists()) {
FileInputStream fis= null;
fis= newFileInputStream(file);
size=fis.available();
}else{
file.createNewFile();
}returnsize;
}/**
* 获取指定文件夹*/
private static longgetFileSizes(File f) throws Exception {long size = 0;
File flist[]=f.listFiles();
assert flist!= null;for(File file : flist) {if(file.isDirectory()) {
size= size +getFileSizes(file);
}else{
size= size +getFileSize(file);
}
}returnsize;
}/**
* 转换文件大小*/
public static String formatFileSize(longfileS) {
DecimalFormat df= new DecimalFormat("#.00");
String fileSizeString= "";
String wrongSize= "0B";if (fileS == 0) {returnwrongSize;
}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";
}returnfileSizeString;
}/**
* 转换文件大小,指定转换的类型*/
private static double FormetFileSize(long fileS, intsizeType) {
DecimalFormat df= new DecimalFormat("#.00");double fileSizeLong = 0;switch(sizeType) {caseSIZETYPE_B:
fileSizeLong= Double.valueOf(df.format((double) fileS));break;caseSIZETYPE_KB:
fileSizeLong= Double.valueOf(df.format((double) fileS / 1024));break;caseSIZETYPE_MB:
fileSizeLong= Double.valueOf(df.format((double) fileS / 1048576));break;caseSIZETYPE_GB:
fileSizeLong= Double.valueOf(df.format((double) fileS / 1073741824));break;default:break;
}returnfileSizeLong;
}
}
