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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();
    }
}