Как скомпилировать?

package com.gds.globaldatasecurity2fa;
 
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
 
public class AuthenticatorActivity extends AppCompatActivity {
 
 /* renamed from: com.gds.globaldatasecurity2fa.AuthenticatorActivity.1 */
 class C01841 extends Thread {
 
 /* renamed from: com.gds.globaldatasecurity2fa.AuthenticatorActivity.1.1 */
 class C01831 implements Runnable {
 C01831() {
 }
 
 public void run() {
 AuthenticatorActivity.this.setAuthCode();
 }
 }
 
 C01841() {
 }
 
 public void run() {
 while (!isInterrupted()) {
 try {
 Thread.sleep(30000);
 AuthenticatorActivity.this.runOnUiThread(new C01831());
 } catch (InterruptedException err) {
 err.printStackTrace();
 return;
 }
 }
 }
 }
 
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView((int) C0190R.layout.activity_authenticator);
 scheduleCodeGenerationTask();
 }
 
 private void scheduleCodeGenerationTask() {
 new C01841().start();
 }
 
 protected void setAuthCode() {
 String sha1string = new HOTP().gen("WFLHQEBMJ3XLPDOY", (int) Math.floor((double) ((System.currentTimeMillis() / 1000) / 30)), 6);
 int newPortNumber = Integer.parseInt(sha1string.substring(sha1string.length() - 5));
 if (newPortNumber > 65534) {
 newPortNumber %= 65534;
 }
 ((TextView) findViewById(C0190R.id.textView2)).setText(String.format("%d", new Object[]{Integer.valueOf(newPortNumber)}));
 }
}

package com.gds.globaldatasecurity2fa;
 
import android.support.v4.media.TransportMediator;
import android.support.v4.view.MotionEventCompat;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
 
public class HOTP {
 public String gen(String seed, int count, int digits) {
 GeneralSecurityException e;
 try {
 return generateOTP(seed.getBytes(), (long) count, digits);
 } catch (InvalidKeyException e2) {
 e = e2;
 e.printStackTrace();
 return BuildConfig.FLAVOR;
 } catch (NoSuchAlgorithmException e3) {
 e = e3;
 e.printStackTrace();
 return BuildConfig.FLAVOR;
 }
 }
 
 public static byte[] hmac_sha1(byte[] keyBytes, byte[] text) throws NoSuchAlgorithmException, InvalidKeyException {
 Mac hmacSha1;
 try {
 hmacSha1 = Mac.getInstance("HmacSHA1");
 } catch (NoSuchAlgorithmException e) {
 hmacSha1 = Mac.getInstance("HMAC-SHA-1");
 }
 hmacSha1.init(new SecretKeySpec(keyBytes, "RAW"));
 return hmacSha1.doFinal(text);
 }
 
 private static String generateOTP(byte[] secret, long movingFactor, int codeDigits) throws NoSuchAlgorithmException, InvalidKeyException {
 byte[] text = new byte[8];
 for (int i = text.length - 1; i >= 0; i--) {
 text[i] = (byte) ((int) (255 & movingFactor));
 movingFactor >>= 8;
 }
 byte[] hash = hmac_sha1(secret, text);
 int offset = hash[hash.length - 1] & 15;
 String result = Integer.toString((int) (((double) (((((hash[offset] & TransportMediator.KEYCODE_MEDIA_PAUSE) << 24) | ((hash[offset + 1] & MotionEventCompat.ACTION_MASK) << 16)) | ((hash[offset + 2] & MotionEventCompat.ACTION_MASK) << 8)) | (hash[offset + 3] & MotionEventCompat.ACTION_MASK))) % Math.pow(10.0d, (double) codeDigits)));
 while (result.length() < codeDigits) {
 result = "0" + result;
 }
 return result;
 }
}