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<WebView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/webView"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.webkit.WebChromeClient;
 import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.LinearLayout;
import android.widget.RelativeLayout;


public class MainActivity extends AppCompatActivity {
private WebView myWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myWebView = (WebView)findViewById(R.id.webView);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://192.168.1.1");
myWebView.setWebViewClient(new WebViewClient());

public static void displayHtmlText(String htmlContent, String message,
                               WebView webView,
                               RelativeLayout videoLayout, LinearLayout      standardLayout, LinearLayout webviewLayout){

WebSettings settings = webView.getSettings();
settings.setMinimumFontSize(18);
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
settings.setBuiltInZoomControls(true);
settings.setDisplayZoomControls(false);

webView.setWebChromeClient(new WebChromeClient());
String changeFontHtml = changedHeaderHtml(htmlContent);
webView.loadDataWithBaseURL(null, changeFontHtml,
        "text/html", "UTF-8", null);

webviewLayout.setVisibility(View.VISIBLE);
standardLayout.setVisibility(View.GONE);
videoLayout.setVisibility(View.GONE);

public static String changedHeaderHtml(String htmlText) {

String head = "<head><meta name="viewport" content="width=device-width, user-scalable=yes" /></head>";

String closedTag = "</body></html>";
String changeFontHtml = head + htmlText + closedTag;
return changeFontHtml;

@Override
public void onBackPressed() {
if(myWebView.canGoBack()) {
    myWebView.goBack();
} else {
    super.onBackPressed();
}