How to Zip/Unzip your file or folder in android programmatically

In this blog, we will learn that how to zip and unzip your file or folder programmatically.

What is Zip file,

A computer file whose contents are compressed for storage or transmission. A ZIP file, like other archive file formats, is simply a collection of one or more files and/or folders but is compressed into a single file for easy transportation and compression.

How to Zip the files

These permissions are required to store data in your device storage.

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

1 2	<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

create a simple zip file,

public class ZipManager { private static int BUFFER_SIZE = 6 * 1024; public static void zip(String[] files, String zipFile) throws IOException { BufferedInputStream origin = null; ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile))); try { byte data[] = new byte[BUFFER_SIZE]; for (int i = 0; i < files.length; i++) { FileInputStream fi = new FileInputStream(files[i]); origin = new BufferedInputStream(fi, BUFFER_SIZE); try { ZipEntry entry = new ZipEntry(files[i].substring(files[i].lastIndexOf("/") + 1)); out.putNextEntry(entry); int count; while ((count = origin.read(data, 0, BUFFER_SIZE)) != -1) { out.write(data, 0, count); } } finally { origin.close(); } } } finally { out.close(); } } }

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public class ZipManager {     private static int BUFFER_SIZE = 6 * 1024;       public static void zip(String[] files, String zipFile) throws IOException {         BufferedInputStream origin = null;         ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile)));         try {             byte data[] = new byte[BUFFER_SIZE];               for (int i = 0; i < files.length; i++) {                 FileInputStream fi = new FileInputStream(files[i]);                 origin = new BufferedInputStream(fi, BUFFER_SIZE);                 try {                     ZipEntry entry = new ZipEntry(files[i].substring(files[i].lastIndexOf("/") + 1));                     out.putNextEntry(entry);                     int count;                     while ((count = origin.read(data, 0, BUFFER_SIZE)) != -1) {                         out.write(data, 0, count);                     }                 } finally {                     origin.close();                 }             }         } finally {             out.close();         }     } }

how to use it, Simple call this function,

String backupDBPath = Environment.getExternalStorageDirectory().getPath() + "/Mobikul-Pos-db-backup"; final File backupDBFolder = new File(backupDBPath); backupDBFolder.mkdirs(); final File backupDB = new File(backupDBFolder, "/db_pos.db"); String[] s = new String[1]; s[0] = backupDB.getAbsolutePath(); zip(s, backupDBPath + "/pos_demo.zip");

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String backupDBPath = Environment.getExternalStorageDirectory().getPath() + "/Mobikul-Pos-db-backup"; final File backupDBFolder = new File(backupDBPath);         backupDBFolder.mkdirs();         final File backupDB = new File(backupDBFolder, "/db_pos.db"); String[] s = new String[1]; s[0] = backupDB.getAbsolutePath(); zip(s, backupDBPath + "/pos_demo.zip");

now you have created a zip file in the Mobikul-Pos-db-backup folder.

How to Unzip the files

public class ZipManager { private static int BUFFER_SIZE = 6 * 1024; public static void unzip(String zipFile, String location) throws IOException { try { File f = new File(location); if (!f.isDirectory()) { f.mkdirs(); } ZipInputStream zin = new ZipInputStream(new FileInputStream(zipFile)); try { ZipEntry ze = null; while ((ze = zin.getNextEntry()) != null) { String path = location + File.separator + ze.getName(); if (ze.isDirectory()) { File unzipFile = new File(path); if (!unzipFile.isDirectory()) { unzipFile.mkdirs(); } } else { FileOutputStream fout = new FileOutputStream(path, false); try { for (int c = zin.read(); c != -1; c = zin.read()) { fout.write(c); } zin.closeEntry(); } finally { fout.close(); } } } } finally { zin.close(); } } catch (Exception e) { e.printStackTrace(); Log.e(TAG, "Unzip exception", e); } } }

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public class ZipManager {     private static int BUFFER_SIZE = 6 * 1024;   public static void unzip(String zipFile, String location) throws IOException {         try {             File f = new File(location);             if (!f.isDirectory()) {                 f.mkdirs();             }             ZipInputStream zin = new ZipInputStream(new FileInputStream(zipFile));             try {                 ZipEntry ze = null;                 while ((ze = zin.getNextEntry()) != null) {                     String path = location + File.separator + ze.getName();                       if (ze.isDirectory()) {                         File unzipFile = new File(path);                         if (!unzipFile.isDirectory()) {                             unzipFile.mkdirs();                         }                     } else {                         FileOutputStream fout = new FileOutputStream(path, false);                           try {                             for (int c = zin.read(); c != -1; c = zin.read()) {                                 fout.write(c);                             }                             zin.closeEntry();                         } finally {                             fout.close();                         }                     }                 }             } finally {                 zin.close();             }         } catch (Exception e) {             e.printStackTrace();             Log.e(TAG, "Unzip exception", e);         }     } }

simply call above function,

File sd = Environment.getExternalStorageDirectory(); if (sd.canWrite()) { final File backupDBFolder = new File(sd.getPath()); unzip(backupDBPath, backupDBFolder.getPath()); }

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File sd = Environment.getExternalStorageDirectory(); if (sd.canWrite()) {    final File backupDBFolder = new File(sd.getPath());    unzip(backupDBPath, backupDBFolder.getPath()); }

Now you have successfully unzipped your file in external storage.

I hope this blog is helpful for you. If you have any doubt please ask in comments.