Webview.java

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class WebViewActivity extends Activity {
    CountDownTimer downTimer;
    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);

        initSettings();
        initComponents();


        Bundle bundle = getIntent().getExtras();
        String uri = bundle.getString("uri");
        webView.getSettings().setLoadsImagesAutomatically(true);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

        webView.loadUrl(uri);

    }

    private void initSettings() {
        View decorView = getWindow().getDecorView();
        int uiOptions = View.SYSTEM_UI_FLAG_IMMERSIVE
                // Set the content to appear under the system bars so that the
                // content doesn't resize when the system bars hide and show.
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                // Hide the nav bar and status bar
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN;
        decorView.setSystemUiVisibility(uiOptions);

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
    }

    private void initComponents() {

        webView = findViewById(R.id.webView);
        webView.setWebViewClient(new MyBrowser());
    }

    private class MyBrowser extends WebViewClient {

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
//            view.loadUrl(request.getUrl().toString());
            view.loadUrl("https://www.google.com");
            return true;
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK) {///disable back button
            Log.d("Test", "Back button pressed!");
            return false;
        }

        return super.onKeyDown(keyCode, event);
    }

    @Override
    protected void onPause() {
        super.onPause();

        ActivityManager activityManager = (ActivityManager) getApplicationContext()
                .getSystemService(Context.ACTIVITY_SERVICE);

        activityManager.moveTaskToFront(getTaskId(), 0);
    }


}