android 解压文件方法

package com.tomatonow.zip;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

public class TestZip {
	/**
	 * 解压缩功能. 将zipFile文件解压到folderPath目录下.
	 * 
	 * @throws Exception
	 */
	public int upZipFile(File zipFile, String folderPath) throws ZipException,
			IOException {

		ZipFile zfile = new ZipFile(zipFile);
		Enumeration zList = zfile.entries();
		ZipEntry ze = null;
		byte[] buf = new byte[1024];
		while (zList.hasMoreElements()) {
			ze = (ZipEntry) zList.nextElement();
			if (ze.isDirectory()) {
				String dirstr = folderPath + ze.getName();
				dirstr = new String(dirstr.getBytes("utf-8"), "utf-8");
				File f = new File(dirstr);
				
				continue;
			}
			OutputStream os = new BufferedOutputStream(new FileOutputStream(
					getRealFileName(folderPath, ze.getName())));
			InputStream is = new BufferedInputStream(zfile.getInputStream(ze));
			int readLen = 0;
			while ((readLen = is.read(buf, 0, 1024)) != -1) {
				os.write(buf, 0, readLen);
			}
			is.close();
			os.close();
		}
		zfile.close();
		return 0;
	}

	/**
	 * 给定根目录，返回一个相对路径所对应的实际文件名.
	 * 
	 * @param baseDir
	 *            指定根目录
	 * @param absFileName
	 *            相对路径名，来自于ZipEntry中的name
	 * @return java.io.File 实际的文件
	 */
	public static File getRealFileName(String baseDir, String absFileName) {
		String[] dirs = absFileName.split("/");
		File ret = new File(baseDir);
		String substr = null;
		if (dirs.length > 1) {
			for (int i = 0; i < dirs.length - 1; i++) {
				substr = dirs[i];
				try {
					substr = new String(substr.getBytes("utf-8"), "utf-8");

				} catch (UnsupportedEncodingException e) {
					e.printStackTrace();
				}
				ret = new File(ret, substr);

			}
			if (!ret.exists())
				ret.mkdirs();
			substr = dirs[dirs.length - 1];
			try {
				substr = new String(substr.getBytes("utf-8"), "utf-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}

			ret = new File(ret, substr);
			return ret;
		}
		return ret;
	}

	public static void main(String[] args) {
		TestZip testZip = new TestZip();

		try {
			testZip.upZipFile(new File("/Users/bruse/Desktop/aa.zip"),
					"/Users/bruse/Desktop/bb");
		} catch (ZipException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}
 :arrow: 

记得要在AndroidManifest.xml里添加权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>