inject CSS to WebView - Android User Interface

Android examples for User Interface:WebView

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Description

inject CSS to WebView

Demo Code

/*/*from   w ww. ja v a 2  s.  c  o m*/
 * {EasyGank}  Copyright (C) {2015}  {CaMnter}
 *
 * This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
 * This is free software, and you are welcome to redistribute it
 * under certain conditions; type `show c' for details.
 *
 * The hypothetical commands `show w' and `show c' should show the appropriate
 * parts of the General Public License.  Of course, your program's commands
 * might be different; for a GUI interface, you would use an "about box".
 *
 * You should also get your employer (if you work as a programmer) or school,
 * if any, to sign a "copyright disclaimer" for the program, if necessary.
 * For more information on this, and how to apply and follow the GNU GPL, see
 * <http://www.gnu.org/licenses/>.
 *
 * The GNU General Public License does not permit incorporating your program
 * into proprietary programs.  If your program is a subroutine library, you
 * may consider it more useful to permit linking proprietary applications with
 * the library.  If this is what you want to do, use the GNU Lesser General
 * Public License instead of this License.  But first, please read
 * <http://www.gnu.org/philosophy/why-not-lgpl.html>.
 */
//package com.java2s;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.util.Base64;
import android.webkit.WebSettings;
import android.webkit.WebView;
import java.io.InputStream;

public class Main {
    @SuppressLint("SetJavaScriptEnabled")
    public static void injectCSS(Context context, WebView webView,
            String filename) {
        try {
            webView.getSettings().setJavaScriptEnabled(true);
            webView.getSettings().setAllowFileAccess(true);
            webView.getSettings().setDatabaseEnabled(true);
            webView.getSettings().setDomStorageEnabled(true);
            webView.getSettings().setSaveFormData(false);
            webView.getSettings().setAppCacheEnabled(true);
            webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
            webView.getSettings().setLoadWithOverviewMode(false);
            webView.getSettings().setUseWideViewPort(true);
            InputStream inputStream = context.getAssets().open(filename);
            byte[] buffer = new byte[inputStream.available()];
            inputStream.read(buffer);
            inputStream.close();
            String encoded = Base64.encodeToString(buffer, Base64.NO_WRAP);
            webView.loadUrl("javascript:(function() {"
                    + "var parent = document.getElementsByTagName('head').item(0);"
                    + "var style = document.createElement('style');"
                    + "style.type = 'text/css';"
                    +
                    // Tell the browser to BASE64-decode the string into your script !!!
                    "style.innerHTML = window.atob('" + encoded + "');"
                    + "parent.appendChild(style)" + "})()");
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                WebView.setWebContentsDebuggingEnabled(true);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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