Base WebView perfect to extend in your project and initialize it like you want -- this implementation hasn't any inicialization -- It has a workaround to avoid problems on Android 4.2.x version with the webview implemented by Jose I Honrado Has a method to load a Error page. Has a method to enable with reflection (when possible) the "plugins" at…

BaseWebView.java

package com.acdroid.widget.webview;

import android.content.Context;
import android.util.AttributeSet;
import android.webkit.WebView;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Method;

import timber.log.Timber;

/**
 * Created by Marcos Trujillo (>‘o’)> on 3/02/14.
 */
public class BaseWebView extends WebView {

    /** UTF-8 Charset */
    public static final String CHARSET_UTF8 = "UTF-8";
    /** Path to webview html template */
    public static final String HTML_TEMPLATE_ERROR = "html/template_webview_error.html";
    /** substring where the error message will be placed */
    public static final String HTML_TEMPLATE_CONTENT = "##CONTENT##";


    public MioBaseWebView(Context context) {
        /*
         * Important: don't allow any WebView subclass to be instantiated using
         * an Activity context, as it will leak on Froyo devices and earlier.
         */
        super(context.getApplicationContext());
        enablePlugins(false);
    }

    public MioBaseWebView(Context context, AttributeSet attrs) {
        super(context.getApplicationContext(), attrs);
        enablePlugins(false);
    }

    public MioBaseWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context.getApplicationContext(), attrs, defStyle);
        enablePlugins(false);
    }

    /**
     * Loads an error page with the <var>error message</var>
     *
     * @param error message
     */
    public void loadErrorPage(String error) {
        try {
            // Load HTML template from assets
            String htmlContent = "";
            InputStream is = getContext().getAssets().open(HTML_TEMPLATE_ERROR);
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String line = null;
            while ((line = br.readLine()) != null) {
                htmlContent += line;
            }
            br.close();

            htmlContent = htmlContent.replace(HTML_TEMPLATE_CONTENT, error);

            loadData(htmlContent, "text/html; charset=" + CHARSET_UTF8, CHARSET_UTF8);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    @Override
    public void onDraw(Canvas canvas) {
        // Workaround for problems in Android 4.2.x
        // You can't type properly in input texts and nor textareas until you
        // touch the webview
        // You can't change the font size until you touch the webview
        // http://stackoverflow.com/questions/15127762/webview-fails-to-render-until-touched-android-4-2-2
        if (SupportVersion.JellyBean()) {
            invalidate();
        }
        super.onDraw(canvas);
    }


    protected void enablePlugins(final boolean enabled) {
        // Android 4.3 and above has no concept of plugin states
        if (SupportVersion.JellyBeanMR1()) {
            return;
        }

        if (SupportVersion.Froyo()) {
            // Note: this is needed to compile against api level 18.
            try {
                Class<Enum> pluginStateClass = (Class<Enum>) Class
                        .forName("android.webkit.WebSettings$PluginState");

                Class<?>[] parameters = {pluginStateClass};
                Method method = getSettings().getClass()
                        .getDeclaredMethod("setPluginState", parameters);

                Object pluginState = Enum.valueOf(pluginStateClass, enabled ? "ON" : "OFF");
                method.invoke(getSettings(), pluginState);
            } catch (Exception e) {
                Timber.w("Unable to modify WebView plugin state.");
            }
        } else {
            try {
                Method method = Class.forName("android.webkit.WebSettings")
                        .getDeclaredMethod("setPluginsEnabled", boolean.class);
                method.invoke(getSettings(), enabled);
            } catch (Exception e) {
                Timber.w("Unable to " + (enabled ? "enable" : "disable")
                        + "WebSettings plugins for BaseWebView.");
            }
        }
    }
}

template_webview_error.html

<html>
	<head>
		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
		<style type="text/css">
			body { font-size:1em; padding:.15em; }
			.error { text-align:center; font-weight:bold; font-size:1.3em; text-color:#555; margin-top:6em; }
		</style>
	</head>
	<body>
		<p class="error">##CONTENT##</p>
	</body>
</html>