Android 解压Zip以及进度回调

一、实现一个回调状态的接口

public interface IProgress {
        void onProgress(int progress);
        void onError(String msg);
        void onDone();
    }

二、获取zip文件的大小

private static long getZipSize(String filePath){
        long size = 0;
        ZipFile f;
        try {
            f = new ZipFile(filePath);
            Enumeration<? extends ZipEntry> en = f.entries();
            while (en.hasMoreElements()) {
                size += en.nextElement().getSize();
            }
        } catch (IOException e) {
            size = 0;
        }
        return size;
    }

三、解压文件，回调状态

public static void unZip(String filePath, String outPath,IProgress iProgress){
        if(!FileUtil.getInstance().isFileExist(filePath)){
            iProgress.onError("zip不存在 " + filePath);
            return;
        }
 
        long zipLength = getZipSize(filePath);
        ZipInputStream zipInputStream = null;
 
        try {
            zipInputStream = new ZipInputStream(new FileInputStream(filePath));
            if(zipInputStream == null || zipInputStream.available() == 0){
                iProgress.onError("zip错误");
                return;
            }
 
            ZipEntry zipEntry;
            String  szName = "";
            long count = 0;
            while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                szName = zipEntry.getName();
                String currentParentFile = "";
                if (zipEntry.isDirectory()) {
                    szName = szName.substring(0, szName.length() - 1);
                    currentParentFile = outPath + File.separator + szName;
                    new File(currentParentFile).mkdirs();
                } else {
                    File file = new File(outPath + "/"  + szName);
                    if (!file.exists()){
                        file.getParentFile().mkdirs();
                        file.createNewFile();
                    }
                    // 获取文件的输出流
                    FileOutputStream out = new FileOutputStream(file);
                    int len;
                    byte[] buffer = new byte[1024];
                    // 读取（字节）字节到缓冲区
                    while ((len = zipInputStream.read(buffer)) != -1) {
                        count += len;
                        int progress = (int)((count * 100)/zipLength) ;
                        iProgress.onProgress(progress);
                        // 从缓冲区（0）位置写入（字节）字节
                        out.write(buffer, 0, len);
                        out.flush();
                    }
                    out.close();
                }
            }
            iProgress.onDone();
        }catch (Exception exc){
            iProgress.onError(exc.getMessage());
        }finally {
            try {
                zipInputStream.close();
                FileUtil.getInstance().deleteFile(filePath);
            } catch (IOException e) {
                iProgress.onError(e.getMessage());
            }
        }
    }

四、通过以上的步骤就可以实现解压zip文件，并且回调解压的进度。