MainActivity.java

package com.fedpromptly.museaudit;

import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import android.app.Activity;

public class MainActivity extends Activity {
    private static final String HOME_URL = "file:///android_asset/site/index.html";
    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setStatusBarColor(Color.rgb(11, 18, 32));
        getWindow().setNavigationBarColor(Color.rgb(11, 18, 32));

        webView = new WebView(this);
        webView.setBackgroundColor(Color.rgb(11, 18, 32));
        setContentView(webView);

        WebSettings settings = webView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setDomStorageEnabled(true);
        settings.setAllowFileAccess(true);
        settings.setAllowContentAccess(true);
        settings.setBuiltInZoomControls(false);
        settings.setDisplayZoomControls(false);
        settings.setSupportZoom(false);
        settings.setLoadWithOverviewMode(false);
        settings.setUseWideViewPort(false);

        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                return openExternalIfNeeded(request.getUrl().toString());
            }

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return openExternalIfNeeded(url);
            }
        });

        webView.loadUrl(HOME_URL);
    }

    private boolean openExternalIfNeeded(String url) {
        if (url.startsWith("file:///android_asset/")) {
            return false;
        }
        try {
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(intent);
        } catch (ActivityNotFoundException ignored) {
            Toast.makeText(this, "No app can open this link", Toast.LENGTH_SHORT).show();
        }
        return true;
    }

    @Override
    public void onBackPressed() {
        if (webView != null && webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }

    @Override
    protected void onDestroy() {
        if (webView != null) {
            webView.loadUrl("about:blank");
            webView.stopLoading();
            webView.destroy();
        }
        super.onDestroy();
    }
}