How to change font face of Webview in Android?

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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 cus

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刺人心

2020-11-22 12:43

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");

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Happy的楠姐

2020-11-22 12:44

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.

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甜味超标

2020-11-22 12:45
There's a working example of this in this project. It boils down to:
1. In your assets/fonts folder, place the desired OTF or TTF font (here MyFont.otf)
2. 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>
```
3. 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).
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刺人心

2020-11-22 12:48
If you are putting fonts under res/font like me, then you can change the dir to the following:-
```
@font-face {
     font-family: yourfont;
     src: url("file:///android_res/font/yourfont.ttf")
}
        
body {
     font-family: yourfont;
}
```
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孤街浪徒

2020-11-22 12:49

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

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感情败类

2020-11-22 12:52

Use https://github.com/delight-im/Android-AdvancedWebView library.

in html data :

<!doctype html>
<html>

<head>
<style type="text/css">
@font-face {
    font-family: MyFont;
    src: url("file:///android_asset/fonts/font1.ttf")
}
body {
    font-family: MyFont;
    font-size: medium;
    text-align: justify;
}
</style>
<meta http-equiv="Content-Type" content="text/html;  charset=utf-8">
<title>Title</title>
</head>

<body>

    ------ YOUR_CONTENT ------

</body>

</html>

in xml :

<im.delight.android.webview.AdvancedWebView
    android:id="@+id/advanced_web_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

in java :

advancedWebView = findViewById(R.id.advanced_web_view);
advancedWebView.loadHtml(htmlData, "text/html; charset=utf-8", "utf-8");

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