If a ZipException or IOException is being thrown when initializing ZipFile then you should test the integrity of the ZIP. You may also want to make sure you have read/write access. If you are unzipping this file on Android's internal storage (sdcard) you need to have the following permission declared in your AndroidManifest.
xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />The code looks okay to me, but here is a solution I cooked up real quick and tested on a valid ZIP file larger than 100 MB:
java
public static boolean unzip(final File zipFile, final File destinationDir) {
ZipFile zip = null;
try {
zip = new ZipFile(zipFile);
final Enumeration<? extends ZipEntry> zipFileEntries = zip.entries();
while (zipFileEntries.hasMoreElements()) {
final ZipEntry entry = zipFileEntries.nextElement();
final String entryName = entry.getName();
final File destFile = new File(destinationDir, entryName);
final File destinationParent = destFile.getParentFile();
if (destinationParent != null && !destinationParent.exists()) {
destinationParent.mkdirs();
}
if (!entry.isDirectory()) {
final BufferedInputStream is = new BufferedInputStream(
zip.getInputStream(entry));
int currentByte;
final byte data[] = new byte[2048];
final FileOutputStream fos = new FileOutputStream(destFile);
final BufferedOutputStream dest = new BufferedOutputStream(fos, 2048);
while ((currentByte = is.read(data, 0, 2048)) != -1) {
dest.write(data, 0, currentByte);
}
dest.flush();
dest.close();
is.close();
}
}
} catch (final Exception e) {
return false;
} finally {
if (zip != null) {
try {
zip.close();
} catch (final IOException ignored) {
}
}
}
return true;
}