From http://www.airpair.com/android/posts/adding-tampering-detection-to-your-android-app

check_apk_signature

private static final int VALID = 0;

  private static final int INVALID = 1;

  public static int checkAppSignature(Context context) {

    try {

      PackageInfo packageInfo = context.getPackageManager()

          .getPackageInfo(context.getPackageName(),

              PackageManager.GET\_SIGNATURES);

      for (Signature signature : packageInfo.signatures) {

        byte[] signatureBytes = signature.toByteArray();

        MessageDigest md = MessageDigest.getInstance("SHA");

        md.update(signature.toByteArray());

        final String currentSignature = Base64.encodeToString(md.digest(), Base64.DEFAULT);

Log.d("REMOVE\_ME", "Include this string as a value for SIGNATURE:" + currentSignature);

        //compare signatures

        if (SIGNATURE.equals(currentSignature)){

          return VALID;

        };

      }

    } catch (Exception e) {

//assumes an issue in checking signature., but we let the caller decide on what to do.

    }

    return INVALID;

  }
Get expert java help

Hello,
Please help me to check my apk signature.
I use android studio.
.
from tutorial on : https://www.airpair.com/android/posts/adding-tampering-detection-to-your-android-app
10-10 17:37:11.483: D/REMOVE_ME:(111):
I really not know how to find it, I already check on logcat too.
.
thank you