{"title":"**How to Set Text Size in WebView on Android**","content":"Adjusting text size in Android's `WebView` can be achieved through several different methods, depending on the required adjustment level and specific use cases. Here are common approaches to set the text size within `WebView`:  

### 1. Using WebSettings to Set Text Zoom Ratio  

You can utilize the `WebSettings` class by calling the `setTextZoom()` method to set the text zoom ratio. Here's a simple example:  

```java
WebView webView = findViewById(R.id.webview);
WebSettings settings = webView.getSettings();
settings.setTextZoom(150); // Set text zoom to 150%
```  

### 2. Modifying HTML Content to Accommodate Different Text Sizes  

If you can control the HTML content loaded into `WebView`, you can directly adjust text size using CSS within the HTML. For example, define a CSS class and apply it to HTML elements:  

```html
<html>
<head>
<style>
    .text-size-large {
        font-size: 20px; /* Or use em, rem, etc. */
    }
</style>
</head>
<body>
    <div class="text-size-large">
        This is larger text.
    </div>
</body>
</html>
```  

Then, load this HTML into `WebView`:  

```java
String customHtml = ...; // The HTML string above
webView.loadData(customHtml, "text/html", "UTF-8");
```  

### 3. Adjusting Text Size via JavaScript  

If you wish to dynamically adjust text size on the page after loading, you can use the `evaluateJavascript` method of `WebView` to execute JavaScript code. For example:  

```java
String javascript = "document.body.style.fontSize = '14pt';";
webView.evaluateJavascript(javascript, null);
```  

### 4. Using WebViewClient's shouldOverrideUrlLoading Method  

You can intercept URL loading requests within the `shouldOverrideUrlLoading` method of `WebViewClient` and adjust text size when loading new content. For example:  

```java
webView.setWebViewClient(new WebViewClient() {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        // Adjust text size here
        WebSettings settings = view.getSettings();
        settings.setTextZoom(150); // Set to 150% for example
        return true;
    }
});
```  

In practical applications, you may need to flexibly apply these methods based on user preferences or different device screen sizes. A common approach is to provide a settings interface where users can choose their preferred text size, and then implement the corresponding method based on their selection."}

How to set text size in WebView in android

1个答案

1. Using WebSettings to Set Text Zoom Ratio

2. Modifying HTML Content to Accommodate Different Text Sizes

3. Adjusting Text Size via JavaScript

4. Using WebViewClient's shouldOverrideUrlLoading Method

你的答案