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class SingleEvent<T> {
  SingleEvent({required Function(T? param) invoke}) : _invoke = invoke;

  final Function(T? param) _invoke;

  bool _isClosed = false;
  bool get isClosed => _isClosed;

  void invokeWith(T? param) {
    if (!_isClosed) {

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import org.apache.commons.codec.binary.Base64
import org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util
import org.bouncycastle.jce.ECNamedCurveTable
import org.bouncycastle.jce.spec.ECNamedCurveSpec
import org.spongycastle.jce.provider.BouncyCastleProvider
import org.web3j.crypto.ECKeyPair
import org.web3j.utils.Numeric
import java.math.BigInteger
import java.security.KeyFactory
import java.security.Security

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package YOUR_PACKAGE;

import android.content.Context;
import android.os.Build;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.cert.Certificate;

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import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.support.annotation.RequiresApi;
import android.support.v4.app.Fragment;

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Git Submodules basic explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of advantages of using submodules:

• You can separate the code into different repositories.

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Git Submodules basic explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of advantages of using submodules:

• You can separate the code into different repositories.