[android help] Read content from APK expansion file (from obb file)

Read content from APK expansion file (from obb file)

I have solved using unzipping..

ZipHelper.java

public class ZipHelper {
static boolean zipError = false;

public static boolean isZipError() {
    return zipError;
}

public static void setZipError(boolean zipError) {
    ZipHelper.zipError = zipError;
}

public static void unzip(String archive, File outputDir) {
    try {
        Log.d("control", "ZipHelper.unzip() - File: " + archive);
        ZipFile zipfile = new ZipFile(archive);
        for (Enumeration e = zipfile.entries(); e
                .hasMoreElements();) {
            ZipEntry entry = (ZipEntry) e.nextElement();
            unzipEntry(zipfile, entry, outputDir);

        }
    } catch (Exception e) {
        Log.d("control", "ZipHelper.unzip() - Error extracting file "
                + archive + ": " + e);
        setZipError(true);
    }
}

private static void unzipEntry(ZipFile zipfile, ZipEntry entry,
        File outputDir) throws IOException {
    if (entry.isDirectory()) {
        createDirectory(new File(outputDir, entry.getName()));
        return;
    }

    File outputFile = new File(outputDir, entry.getName());
    if (!outputFile.getParentFile().exists()) {
        createDirectory(outputFile.getParentFile());
    }

    Log.d("control", "ZipHelper.unzipEntry() - Extracting: " + entry);
    BufferedInputStream inputStream = new BufferedInputStream(
            zipfile.getInputStream(entry));
    BufferedOutputStream outputStream = new BufferedOutputStream(
            new FileOutputStream(outputFile));

    try {
        IOUtils.copy(inputStream, outputStream);
    } catch (Exception e) {
        Log.d("control", "ZipHelper.unzipEntry() - Error: " + e);
        setZipError(true);
    } finally {
        outputStream.close();
        inputStream.close();
    }
}

private static void createDirectory(File dir) {
    Log.d("control",
            "ZipHelper.createDir() - Creating directory: " + dir.getName());
    if (!dir.exists()) {
        if (!dir.mkdirs())
            throw new RuntimeException("Can't create directory " + dir);
    } else
        Log.d("control",
                "ZipHelper.createDir() - Exists directory: "
                        + dir.getName());
}
}

Usage

try {
        ZipResourceFile expansionFile = APKExpansionSupport
                .getAPKExpansionZipFile(this, 3, 0);

        ZipEntryRO[] zip = expansionFile.getAllEntries();
        Log.e("", "zip[0].isUncompressed() : " + zip[0].isUncompressed());
        Log.e("",
                "mFile.getAbsolutePath() : "
                        + zip[0].mFile.getAbsolutePath());
        Log.e("", "mFileName : " + zip[0].mFileName);
        Log.e("", "mZipFileName : " + zip[0].mZipFileName);
        Log.e("", "mCompressedLength : " + zip[0].mCompressedLength);

        File file = new File(Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "");
        ZipHelper.unzip(zip[0].mZipFileName, file);

        if (file.exists()) {
            Log.e("", "unzipped : " + file.getAbsolutePath());
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

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