Android How to - Validate APK File

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Question

We would like to know how to validate APK File.

Answer

//from   www.java  2 s . c om
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarFile;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

class ApkUtil {
    private static final Logger log = Logger.getLogger(ApkUtil.class.getName());

    public static int BUFFER = 2048;

    private static String MANIFEST = "AndroidManifest.xml";
    private static String RESOURCE = "resources.arsc";
    private static String DEX = "classes.dex";
    private static String CERTIFICATE = "META-INF/MANIFEST.MF";

    /*
     * If this apk file is a zip which contains one or more REAL apks, it should
     * extract some or all of them TODO enhance it for more complex condition
     * (e.g. check the header of the file)
     */
    public synchronized static List<String> extractApks(String apkPath) {
        List<String> ret = new ArrayList<String>();
        try {
            ZipFile zip = new ZipFile(apkPath);
            Enumeration<? extends ZipEntry> entries = zip.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = entries.nextElement();
                if (entry.getName().endsWith(".apk")) {
                    // Get a new tmp file
                    String tmpFilePath = FileUtil
                            .getTempFile("apktmp_", ".apk");
                    FileOutputStream fos = new FileOutputStream(tmpFilePath);
                    BufferedInputStream is = new BufferedInputStream(
                            zip.getInputStream(entry));
                    // Get it out of the box
                    int count = 0;
                    byte[] buf = new byte[BUFFER];
                    count = is.read(buf, 0, BUFFER);
                    while ((count = is.read(buf, 0, BUFFER)) != -1) {
                        fos.write(buf, 0, count);
                    }
                    fos.flush();
                    fos.close();

                    // If the zip contains AndroidManifest.xml, basically it's
                    // an apk
                    JarFile jar = new JarFile(tmpFilePath);
                    if (jar.getEntry("AndroidManifest.xml") != null)
                        ret.add(tmpFilePath);
                    jar.close();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ret;
    }

    public static synchronized boolean validateApk(String apkPath) {
        boolean ret = false;
        JarFile apkJar = null;
        try {
            apkJar = new JarFile(apkPath, true);
            if (apkJar.getJarEntry(MANIFEST) == null
                    || (apkJar.getJarEntry(RESOURCE) == null)
                    || (apkJar.getJarEntry(DEX) == null)
                    || (apkJar.getJarEntry(CERTIFICATE) == null))
                ret = false;
            else
                ret = true;
        } catch (Exception e) {
            ret = false;
            e.printStackTrace();
        } finally {
            if (apkJar != null) {
                try {
                    apkJar.close();
                } catch (IOException e) {
                    log.log(Level.WARNING, e.getCause().getMessage());
                    e.printStackTrace();
                }
                apkJar = null;
            }
        }
        return ret;
    }
}

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