How to install/update/remove APK using “PackageInstaller” class in Android L?

Question

Plz check below classe & give me the suggestion for how to use them https://developer.android.com/reference/android/content/pm/PackageInstaller.html https://developer.an

Answer 1

This works for me as well, although my device owner restricts the installation of apps and unknown sources by the user. Even if I running this example as device admin, I've got the java.lang.SecurityException: User restriction prevents installing.

openSession is checking for permissions. With this simple modificaton it is possible to reset the user restrictions only during a short method call.

public static DevicePolicyManager getDpm(Context context) {
    return (DevicePolicyManager)context.getSystemService(Context.DEVICE_POLICY_SERVICE);
}

public static ComponentName getAdmin(Context context) {
    return new ComponentName(context, MyDevicePolicyReceiver.class);
}

public static void addMyRestrictions(Context context) {
   getDpm(context).addUserRestriction(getAdmin(context), UserManager.DISALLOW_INSTALL_APPS);
   getDpm(context).addUserRestriction(getAdmin(context), UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
}

public static void clearMyRestrictions(Context context) {    
   getDpm(context).clearUserRestriction(getAdmin(context), UserManager.DISALLOW_INSTALL_APPS);
   getDpm(context).clearUserRestriction(getAdmin(context), UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
}

public static void installPackage(Context context, InputStream inputStream)
    throws IOException {
    PackageInstaller packageInstaller = context.getPackageManager().getPackageInstaller();
    int sessionId = packageInstaller.createSession(new PackageInstaller
        .SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL));

    //openSession checks for user restrictions
    clearMyRestrictions(context);
    PackageInstaller.Session session = packageInstaller.openSession(sessionId);
    addMyRestrictions(context);

    long sizeBytes = 0;

    OutputStream out = null;
    out = session.openWrite("my_app_session", 0, sizeBytes);

    int total = 0;
    byte[] buffer = new byte[65536];
    int c;
    while ((c = inputStream.read(buffer)) != -1) {
        total += c;
        out.write(buffer, 0, c);
    }
    session.fsync(out);
    inputStream.close();
    out.close();

    // fake intent
    IntentSender statusReceiver = null;
    Intent intent = new Intent(context, SomeActivity.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
        1337111117, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    session.commit(pendingIntent.getIntentSender());
    session.close();
}

Please take care of exception handling.