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how to install app from android phone programmatically

public boolean installPackage(Context context,
                                     String packageName, String packagePath) {
    ComponentName name = new ComponentName(MyAppName, MyDeviceAdminReceiver.class.getCanonicalName());
    PackageManager packageManger = context.getPackageManager();
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        PackageInstaller packageInstaller = packageManger.getPackageInstaller();
        PackageInstaller.SessionParams params = new PackageInstaller.SessionParams(
                PackageInstaller.SessionParams.MODE_FULL_INSTALL);
        params.setAppPackageName(packageName);
        try {
            int sessionId = packageInstaller.createSession(params);
            PackageInstaller.Session session = packageInstaller.openSession(sessionId);
            OutputStream out = session.openWrite(packageName + ".apk", 0, -1);
            readTo(packagePath, out); //read the apk content and write it to out
            session.fsync(out);
            out.close();
            System.out.println("installing...");
            session.commit(PendingIntent.getBroadcast(context, sessionId,
                    new Intent("android.intent.action.MAIN"), 0).getIntentSender());
            System.out.println("install request sent");
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
    }
    System.err.println("old sdk");
    return false;
}