zip/compress a folder full of files on android

Question

I need to zip up a "project" folder to allow users to share projects via email. I found a class for zipping up multiple files into one zip, but I need to keep the folder structure in my zip. Is there any way to achieve this on android? Thanks in advance.

Answer 1

This code should do the trick.

Note: you must add file write permissions to your app by adding the WRITE_EXTERNAL_STORAGE permission to your manifest.xml file.

/*  *   * Zips a file at a location and places the resulting zip file at the toLocation  * Example: zipFileAtPath("downloads/myfolder", "downloads/myFolder.zip");  */  public boolean zipFileAtPath(String sourcePath, String toLocation) {     final int BUFFER = 2048;      File sourceFile = new File(sourcePath);     try {         BufferedInputStream origin = null;         FileOutputStream dest = new FileOutputStream(toLocation);         ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(                 dest));         if (sourceFile.isDirectory()) {             zipSubFolder(out, sourceFile, sourceFile.getParent().length());         } else {             byte data[] = new byte[BUFFER];             FileInputStream fi = new FileInputStream(sourcePath);             origin = new BufferedInputStream(fi, BUFFER);             ZipEntry entry = new ZipEntry(getLastPathComponent(sourcePath));             entry.setTime(sourceFile.lastModified()); // to keep modification time after unzipping             out.putNextEntry(entry);             int count;             while ((count = origin.read(data, 0, BUFFER)) != -1) {                 out.write(data, 0, count);             }         }         out.close();     } catch (Exception e) {         e.printStackTrace();         return false;     }     return true; }  /*  *   * Zips a subfolder  *   */  private void zipSubFolder(ZipOutputStream out, File folder,         int basePathLength) throws IOException {      final int BUFFER = 2048;      File[] fileList = folder.listFiles();     BufferedInputStream origin = null;     for (File file : fileList) {         if (file.isDirectory()) {             zipSubFolder(out, file, basePathLength);         } else {             byte data[] = new byte[BUFFER];             String unmodifiedFilePath = file.getPath();             String relativePath = unmodifiedFilePath                     .substring(basePathLength);             FileInputStream fi = new FileInputStream(unmodifiedFilePath);             origin = new BufferedInputStream(fi, BUFFER);             ZipEntry entry = new ZipEntry(relativePath);             entry.setTime(file.lastModified()); // to keep modification time after unzipping             out.putNextEntry(entry);             int count;             while ((count = origin.read(data, 0, BUFFER)) != -1) {                 out.write(data, 0, count);             }             origin.close();         }     } }  /*  * gets the last path component  *   * Example: getLastPathComponent("downloads/example/fileToZip");  * Result: "fileToZip"  */ public String getLastPathComponent(String filePath) {     String[] segments = filePath.split("/");     if (segments.length == 0)         return "";     String lastPathComponent = segments[segments.length - 1];     return lastPathComponent; } 

Answer 2

I have reworked the code from HailZeon to work properly under windows. Zip Entries must be closed before new ones are started and a starting "/" at entry names like "/file.txt" makes also problems

/**
 * Zips a Folder to "[Folder].zip"
 * @param toZipFolder Folder to be zipped
 * @return the resulting ZipFile
 */
public static File zipFolder(File toZipFolder) {
    File ZipFile = new File(toZipFolder.getParent(), format("%s.zip", toZipFolder.getName()));
    try {
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(ZipFile));
        zipSubFolder(out, toZipFolder, toZipFolder.getPath().length());
        out.close();
        return ZipFile;
    } catch (Exception ex) {
        ex.printStackTrace();
        return null;
    }
}

/**
 * Main zip Function
 * @param out Target ZipStream
 * @param folder Folder to be zipped
 * @param basePathLength Length of original Folder Path (for recursion)
 */
private static void zipSubFolder(ZipOutputStream out, File folder, int basePathLength) throws IOException {

    final int BUFFER = 2048;

    File[] fileList = folder.listFiles();
    BufferedInputStream origin = null;
    for (File file : fileList) {
        if (file.isDirectory()) {
            zipSubFolder(out, file, basePathLength);
        } else {
            byte data[] = new byte[BUFFER];

            String unmodifiedFilePath = file.getPath();
            String relativePath = unmodifiedFilePath.substring(basePathLength + 1);

            FileInputStream fi = new FileInputStream(unmodifiedFilePath);
            origin = new BufferedInputStream(fi, BUFFER);

            ZipEntry entry = new ZipEntry(relativePath);
            entry.setTime(file.lastModified()); // to keep modification time after unzipping
            out.putNextEntry(entry);

            int count;
            while ((count = origin.read(data, 0, BUFFER)) != -1) {
                out.write(data, 0, count);
            }
            origin.close();
            out.closeEntry();
        }
    }
}

Answer 3

this is how I do it:

private static void zipFolder(String inputFolderPath, String outZipPath) {
    try {
        FileOutputStream fos = new FileOutputStream(outZipPath);
        ZipOutputStream zos = new ZipOutputStream(fos);
        File srcFile = new File(inputFolderPath);
        File[] files = srcFile.listFiles();
        Log.d("", "Zip directory: " + srcFile.getName());
        for (int i = 0; i < files.length; i++) {
            Log.d("", "Adding file: " + files[i].getName());
            byte[] buffer = new byte[1024];
            FileInputStream fis = new FileInputStream(files[i]);
            zos.putNextEntry(new ZipEntry(files[i].getName()));
            int length;
            while ((length = fis.read(buffer)) > 0) {
                zos.write(buffer, 0, length);
            }
            zos.closeEntry();
            fis.close();
        }
        zos.close();
    } catch (IOException ioe) {
        Log.e("", ioe.getMessage());
    }
}