SecureIot_AndroidClient/app/src/main/java/com/skulixlabs/iotcontrol/AboutFragment.java

package com.skulixlabs.iotcontrol;

import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;


public class AboutFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_about, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        view.findViewById(R.id.btnLicenses).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new OpenSourceLicensesDialog().newInstance().show(getChildFragmentManager(), "dialog_licenses");
            }
        });
    }

    public static class OpenSourceLicensesDialog extends DialogFragment {

        public static OpenSourceLicensesDialog newInstance() {
            OpenSourceLicensesDialog dialog = new OpenSourceLicensesDialog();
            Bundle args = new Bundle();
            dialog.setArguments(args);
            return dialog;
        }

        @Override
        public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
            WebView webView = new WebView(requireActivity());
            webView.loadUrl("file:///android_asset/open_source_licenses.html");

            return new AlertDialog.Builder(requireActivity())
                    .setTitle("Open Source Licenses")
                    .setView(webView)
                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int i) {
                            dialog.dismiss();
                        }
                    })
                    .create();
        }
    }
}