How to set text size in WebView in android

2019-01-16 20:55发布

站内问答 / Android
1221 7 4

I am using WebView to justify text. I want to know-

  1. Is it possible to set the text size in layout file? As I want different text size for different screen sizes.

  2. And also one problem is first background appears then after 2 second text display. Is it possible to display text immediately?

Size of text is 7-8 lines.

Code-

public class Main extends Activity {

       WebView mWebView;

       @Override
       public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);        
          mWebView = (WebView) findViewById(R.id.webview);
          String text = "<html><body>"+"<p align=\"justify\">"+getString(R.string.itext)+"</p>"+"</body></html>"; 
      mWebView .loadData(text, "text/html", "utf-8");
      mWebView .setBackgroundColor(Color.TRANSPARENT);
       }
}

Xml-

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:orientation="vertical" 
       android:layout_width="fill_parent"
       android:layout_height="fill_parent" 
       android:background="@drawable/light">

<WebView
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/transparent"/>
</LinearLayout>

7条回答
聊天终结者
2楼-- · 2019-01-16 21:08

1 - I'm using this code that gives me a good result on all my devices.

If web is tyour WebView,

web = (WebView) v.findViewById(R.id.htmlDisplay);
// Impostazioni della WebView.
final WebSettings webSettings = web.getSettings();
// Set the font size (in sp).
webSettings.setDefaultFontSize(20);

OK, this is hardcoded

Now, a more dynamic solution (as per your question):

If you put your desired size in an integers file (several, one for each screen you are supporting), you could do so to retrieve its value:

Resources res = getResources();
float fontSize = res.getInteger(R.integer.font_size);
webSettings.setDefaultFontSize(fontSize);

Assuming that your res/values/integers.xml file(s) is similar to this one:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <integer name="font_size">20</integer>
</resources>

So change this line in the above code

webSettings.setDefaultFontSize(20);

to

webSettings.setDefaultFontSize(fontSize);

2 - To load things faster, I use the following code

// Optimize loading times.
webSettings.setAppCacheEnabled(false);
webSettings.setBlockNetworkImage(true);
webSettings.setLoadsImagesAutomatically(true);
webSettings.setGeolocationEnabled(false);
webSettings.setNeedInitialFocus(false);
webSettings.setSaveFormData(false);

Note that I load more than 7-8 lines of text: it's a full HTML page with JavaScript to expand / collapse sections. And it takes, say, half a second to load. So, I guess, 7-8 lines of text will be loaded in a flash.

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Bombasti
3楼-- · 2019-01-16 21:08

You can use Html.fromHtml() and write your text in HTML format.

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Animai°情兽
4楼-- · 2019-01-16 21:09 
WebSettings webSettings = webView.getSettings();

either setTextSize or

webSettings.setTextSize(WebSettings.TextSize.SMALLEST);

This one works too:

webSettings.setDefaultFontSize(10);

And Display text immediately:

webview.getSettings().setRenderPriority(RenderPriority.HIGH);
webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
webview.setBlockNetworkImage(true);
webview.setLoadsImagesAutomatically(true);
webwebviewSettings.setGeolocationEnabled(false);
webview.setNeedInitialFocus(false);
webview.setSaveFormData(false);
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SAY GOODBYE
5楼-- · 2019-01-16 21:11

There is three way to set FontSize on WebView.

1) WebView.setDefaultFontSize(int)

webview.setDefaultFontSize(50);

2) WebView.getSettings().setTextSize(WebSettings.TextSize.SMALLEST)

WebView.getSettings().setTextSize(TextSize.SMALLEST);

or

WebView.getSettings().setTextSize(TextSize.SMALLER);

or 

WebView.getSettings().setTextSize(TextSize.NORMAL);

or 

WebView.getSettings().setTextSize(TextSize.BIGGER);

or 

WebView.getSettings().setTextSize(TextSize.BIGGEST);

3) Add font-size in html formate.

String text = "<html><body style=\"color:black;font-family:Helvetica;font-size:12px;\"'background-color:transparent' >"+"<p align=\"justify\">"+getString(R.string.itext)+"</p>"+"</body></html>";
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时光不老，我们不散
6楼-- · 2019-01-16 21:13

For setting text size from layout-

final WebSettings webSettings = web.getSettings();
Resources res = getResources();
fontSize = res.getDimension(R.dimen.txtSize);
webSettings.setDefaultFontSize((int)fontSize);

For Immediate text display-

webSettings.setRenderPriority(RenderPriority.HIGH);
webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
webSettings.setAppCacheEnabled(false);
webSettings.setBlockNetworkImage(true);
webSettings.setLoadsImagesAutomatically(true);
webSettings.setGeolocationEnabled(false);
webSettings.setNeedInitialFocus(false);
webSettings.setSaveFormData(false);

In values folder-

<resources>

    <dimen name="txtSize">26sp</dimen>

</resources>

Hope it works.

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Luminary・发光体
7楼-- · 2019-01-16 21:32

You can always use CSS to change the font size:

String text = "<html><style type=\"text/css\">p{text-align:justify;font-size:80%;}</style></head><body>"+"<p>"+getString(R.string.text1)+"</p>"+"</body></html>";

mWebView.loadData(text, "text/html", "utf-8");

To display fater, as Digvesh Patel said before:

webview.getSettings().setRenderPriority(RenderPriority.HIGH);
webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
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