How to change font face of Webview in Android?

问题

I want change the default font of webview to a custom font. I\'m using webview in developing an bilingual browser app for Android.

I tried getting an instance of custom typeface by placing my custom font in assets. But still couldn\'t set webview\'s default font to my font.

This is what I tried:

Typeface font = Typeface.createFromAsset(getAssets(), \"myfont.ttf\"); 
private WebView webview;
WebSettings webSettings = webView.getSettings();
webSettings.setFixedFontFamily(font);

Can anyone correct this or suggest any other method to change webview\'s default font to a custom font?

Thanks!

回答1:

There's a working example of this in this project. It boils down to:

In your assets/fonts folder, place the desired OTF or TTF font (here MyFont.otf)

Create a HTML file that you'll use for the WebView's content, inside the assets folder (here inside assets/demo/my_page.html):

<html>
<head>
<style type="text/css">
@font-face {
    font-family: MyFont;
    src: url("file:///android_asset/fonts/MyFont.otf")
}
body {
    font-family: MyFont;
    font-size: medium;
    text-align: justify;
}
</style>
</head>
<body>
Your text can go here! Your text can go here! Your text can go here!
</body>
</html>

Load the HTML into the WebView from code:

webview.loadUrl("file:///android_asset/demo/my_page.html");

Take note that injecting the HTML through loadData() is not permitted. As per the documentation:

Note that JavaScript's same origin policy means that script running in a page loaded using this method will be unable to access content loaded using any scheme other than 'data', including 'http(s)'. To avoid this restriction, use loadDataWithBaseURL() with an appropriate base URL.

As @JaakL suggests in the comment below, for loading HTML from a string, you should instead provide the base URL pointing to your assets:

webView.loadDataWithBaseURL("file:///android_asset/", htmlData);

When referencing the font in htmlData, you may then simply use /fonts/MyFont.otf (omitting the base URL).

回答2:

I am using this code :

wv = (WebView) findViewById(R.id.webView1);
String pish = "<html><head><style type=\"text/css\">@font-face {font-family: MyFont;src: url(\"file:///android_asset/font/BMitra.ttf\")}body {font-family: MyFont;font-size: medium;text-align: justify;}</style></head><body>";
String pas = "</body></html>";
String myHtmlString = pish + YourTxext + pas;
wv.loadDataWithBaseURL(null,myHtmlString, "text/html", "UTF-8", null);

回答3:

Even simpler, you can use the Asset URL format to reference the font. No programming needed!

@font-face {
   font-family: 'myface';
   src: url('file:///android_asset/fonts/myfont.ttf'); 
} 

body { 
   font-family: 'myface', serif;

...

回答4:

It can be done in Android. I took three days to solve this issue. But now it seems very easy. Follow these steps to set custom font for Webview

1.Add your font to assets folder
2.Copy the font to application's files directory

private boolean copyFile(Context context,String fileName) {
        boolean status = false;
        try { 
            FileOutputStream out = context.openFileOutput(fileName, Context.MODE_PRIVATE);
            InputStream in = context.getAssets().open(fileName);
            // Transfer bytes from the input file to the output file
            byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
            // Close the streams
            out.close();
            in.close();
            status = true;
        } catch (Exception e) {
            System.out.println("Exception in copyFile:: "+e.getMessage());
            status = false;
        }
        System.out.println("copyFile Status:: "+status);
        return status;
    }

3.You have to call above function only once (you have to find some logic for this).

copyFile(getContext(), "myfont.ttf");

4.Use the below code to set value for your webview. Here I am using CSS to set font.

private String getHtmlData(Context context, String data){
    String head = "<head><style>@font-face {font-family: 'verdana';src: url('file://"+ context.getFilesDir().getAbsolutePath()+ "/verdana.ttf');}body {font-family: 'verdana';}</style></head>";
    String htmlData= "<html>"+head+"<body>"+data+"</body></html>" ;
    return htmlData;
 }

5.You can call the above function as below

webview.loadDataWithBaseURL(null, getHtmlData(activity,htmlData) , "text/html", "utf-8", "about:blank");

回答5:

i done this by upper answers with this additions:

webView.loadDataWithBaseURL("file:///android_asset/",
                            WebClient.getStyledFont(someText),
                            "text/html; charset=UTF-8", null, "about:blank");

and then use src: url("file:///android_asset/fonts/YourFont...

public static String getStyledFont(String html) {
    boolean addBodyStart = !html.toLowerCase().contains("<body>");
    boolean addBodyEnd = !html.toLowerCase().contains("</body");
    return "<style type=\"text/css\">@font-face {font-family: CustomFont;" +
            "src: url(\"file:///android_asset/fonts/Brandon_reg.otf\")}" +
            "body {font-family: CustomFont;font-size: medium;text-align: justify;}</style>" +
            (addBodyStart ? "<body>" : "") + html + (addBodyEnd ? "</body>" : "");
}

thanks to everybody:)

回答6:

Many of the above answers work lie a charm if you have your content in your assets folder.

However, if you like me want to download and save all your assets from a server to your internal storage you can instead use loadDataWithBaseURL and use a reference to your internal storage as the baseUrl. Then all files there will be relative to the loaded html and are found and used correctly.

In my internal storage I have saved the following files:

IndigoAntiqua2Text-Regular.ttf
style.css
image.png

Then I use the following code:

WebView web = (WebView)findViewById(R.id.webby);
//For avoiding a weird error message
web.setLayerType(View.LAYER_TYPE_SOFTWARE, null);

String webContent = "<!DOCTYPE html><html><head><meta charset=\"UTF-8\"><link rel=\"stylesheet\" href=\"style.css\"></head>"
                            + "<body><img src='image.png' width=\"100px\"><div class=\"running\">I am a text rendered with INDIGO</div></body></html>";

String internalFilePath = "file://" + getFilesDir().getAbsolutePath() + "/";
web.loadDataWithBaseURL(internalFilePath, webContent, "text/html", "UTF-8", "");

The CSS file used in the above html (style.css):

@font-face {
  font-family: 'MyCustomRunning';
  src: url('IndigoAntiqua2Text-Regular.ttf')  format('truetype');
}

.running{
    color: #565656;
     font-family: "MyCustomRunning";
     font-size: 48px;
}

I have only tried this while targeting minSdkVersion 19 (4.4) so I have no idea if it works on other versions

回答7:

 webview= (WebView) findViewById(R.id.webview);
 String myCustomStyleString="<style type=\"text/css\">@font-face {font-family: MyFont;src: url(\"file:///android_asset/fonts/iranian_sans.ttf\")}body,* {font-family: MyFont; font-size: 13px;text-align: justify;}img{max-width:100%;height:auto; border-radius: 8px;}</style>";
 webview.loadDataWithBaseURL("", myCustomStyleString+"<div style=\"direction:rtl\">"+intentpost.getStringExtra("content")+"</div>", "text/html", "utf-8", null);

回答8:

You can do it by using CSS. I did it with an app but it won't work in Android 2.1 as there is an known bug with Android browser 2.1.

回答9:

The issue is it needs to be in a folder, try putting "./myfont.ttf" instead, if not put the font inside a folder in assets like "fonts/myfont.ttf" that will work for sure.

回答10:

You need not use local ttf file to set webview font for android, It will increase the whole app size.

you can also use online fonts like google's font... It will help to reduce your apk size.

For example: visit the below URL https://gist.github.com/karimnaaji/b6c9c9e819204113e9cabf290d580551#file-googlefonts-txt

You will found necessary info to use this font. then create a String like below

String font = "@font-face {font-family: MyFont;src: url(\"here you will put the url of the font which you get previously\")}body {font-family: MyFont;font-size: medium;text-align: justify;}";

then load the webview like this

webview.loadDataWithBaseURL("about:blank", "<style>" +font+</style>" + "your html contnet here", "text/html", null, null);

done. You will able to load the font from the external source in this way.

Now whats about the app font, it doesn't make sense to use 1 font for the webview and different font for the whole app. So you can use Downloadable Fonts in your app which also uses external sources for loading fonts in the app.

回答11:

test it, work for me like a charm :

   private void setResult() {

        String mimeType = "text/html;charset=UTF-8";
        String encoding = "utf-8";
        String htmlText = htmlPrivacy;

        String text = "<html><head>"
                + "<style type=\"text/css\">@font-face {font-family: MyFont;src: url(\"file:///android_asset/fonts/iy_reg.ttf\")}body{font-family: MyFont;color: #666666}"
                + "</style></head>"
                + "<body>"
                + htmlText
                + "</body></html>";

        webView.loadDataWithBaseURL(null, text, mimeType, encoding, null);
    }

回答12:

This is how do you load htmlData in a webview:

webview.loadDataWithBaseURL(null, getHtmlData(activity,**htmlData**) , "text/html", "utf-8", "about:blank");

where getHtmlData(activity,**htmlData**) returns a string of html code.

来源：https://stackoverflow.com/questions/3900658/how-to-change-font-face-of-webview-in-android

标签

android

webview

font-face

custom-font