How do I set URL for WebView from layout XML in Android?

Question

I'm trying to set the URL for a WebView from the layout main.xml.

By code, it's simple:

WebView webview = (WebView)findViewById(R.id.webview); webview.getSettings().setJavaScriptEnabled(true); webview.loadUrl("file:///android_asset/index.html"); 

Is there a simple way to put this logic into the layout XML file?

Answer 1

You can declare your custom view and apply custom attributes as described here.

The result would look similar to this:

in your layout

<my.package.CustomWebView         custom:url="@string/myurl"         android:layout_height="match_parent"         android:layout_width="match_parent"/> 

in your attr.xml

<resources>     <declare-styleable name="Custom">         <attr name="url" format="string" />     </declare-styleable> </resources> 

finally in your custom web view class

    public class CustomWebView extends WebView {          public CustomWebView(Context context, AttributeSet attributeSet) {             super(context);              TypedArray attributes = context.getTheme().obtainStyledAttributes(                     attributeSet,                     R.styleable.Custom,                     0, 0);             try {                 if (!attributes.hasValue(R.styleable.Custom_url)) {                     throw new RuntimeException("attribute myurl is not defined");                 }                  String url = attributes.getString(R.styleable.Custom_url);                 this.loadUrl(url);             } finally {                 attributes.recycle();             }         }     }